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[PIC32] Problem with C Code {Biometric Attendance System project]

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pic.programmer

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I am making a Biometric Attendance System and I am have problem declaring a struct.

Here is the struct.

It is giving errors.

Code C - [expand]
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#define bool char
 
#define true 1
#define flase 0
 
struct Commands_Packet {
    struct Commands {
        enum Commands_Enum {
            NotSet              = 0x00,   // Default value for enum. Scanner will return error if sent this.
            Open                = 0x01,   // Open Initialization
            Close               = 0x02,   // Close Termination
            UsbInternalCheck    = 0x03,   // UsbInternalCheck Check if the connected USB device is valid
            ChangeEBaudRate     = 0x04,   // ChangeBaudrate Change UART baud rate
            SetIAPMode          = 0x05,   // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
            CmosLed             = 0x12,   // CmosLed Control CMOS LED
            GetEnrollCount      = 0x20,   // Get enrolled fingerprint count
            CheckEnrolled       = 0x21,   // Check whether the specified ID is already enrolled
            EnrollStart         = 0x22,   // Start an enrollment
            Enroll1             = 0x23,   // Make 1st template for an enrollment
            Enroll2             = 0x24,   // Make 2nd template for an enrollment
            Enroll3             = 0x25,   // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
            IsPressFinger       = 0x26,   // Check if a finger is placed on the sensor
            DeleteID            = 0x40,   // Delete the fingerprint with the specified ID
            DeleteAll           = 0x41,   // Delete all fingerprints from the database
            Verify1_1           = 0x50,   // Verification of the capture fingerprint image with the specified ID
            Identify1_N         = 0x51,   // Identification of the capture fingerprint image with the database
            VerifyTemplate1_1   = 0x52,   // Verification of a fingerprint template with the specified ID
            IdentifyTemplate1_N = 0x53,   // Identification of a fingerprint template with the database
            CaptureFinger       = 0x60,   // Capture a fingerprint image(256x256) from the sensor
            MakeTemplate        = 0x61,   // Make template for transmission
            GetImage            = 0x62,   // Download the captured fingerprint image(256x256)
            GetRawImage         = 0x63,   // Capture & Download raw fingerprint image(320x240)
            GetTemplate         = 0x70,   // Download the template of the specified ID
            SetTemplate         = 0x71,   // Upload the template of the specified ID
            GetDatabaseStart    = 0x72,   // Start database download, obsolete
            GetDatabaseEnd      = 0x73,   // End database download, obsolete
            UpgradeFirmware     = 0x80,   // Not supported
            UpgradeISOCDImage   = 0x81,   // Not supported
            Ack                 = 0x30,   // Acknowledge.
            Nack                = 0x31    // Non-acknowledge
        };
    };
 
 
 
Commands.Commands_Enum fpsCommand;
unsigned char Parameter[4];                // Parameter 4 bytes, changes meaning depending on command
 
static const byte COMMAND_START_CODE_1 = 0x55;  // Static byte to mark the beginning of a command packet  - never changes
static const byte COMMAND_START_CODE_2 = 0xAA;  // Static byte to mark the beginning of a command packet  - never changes
static const byte COMMAND_DEVICE_ID_1 = 0x01; // Device ID Byte 1 (lesser byte)             - theoretically never changes
static const byte COMMAND_DEVICE_ID_2 = 0x00; // Device ID Byte 2 (greater byte)              - theoretically never changes
unsigned char command[2];                // Command 2 bytes
 
unsigned char* GetPacketBytes();             // returns the bytes to be transmitted
void ParameterFromInt(int i);
unsigned int _CalculateChecksum();            // Checksum is calculated using byte addition
unsigned char GetHighByte(unsigned int w);
unsigned char GetLowByte(unsigned int w);
 
unsigned char* Command_Packet_GetPacketBytes()
{
  unsigned char packetbytes[12];
  unsigned int cmd, checksum;
 
  // update command before calculating checksum (important!)
  cmd = Command;
  command[0] = GetLowByte(cmd);
  command[1] = GetHighByte(cmd);
 
  checksum = _CalculateChecksum();
 
  packetbytes[0] = COMMAND_START_CODE_1;
  packetbytes[1] = COMMAND_START_CODE_2;
  packetbytes[2] = COMMAND_DEVICE_ID_1;
  packetbytes[3] = COMMAND_DEVICE_ID_2;
  packetbytes[4] = Parameter[0];
  packetbytes[5] = Parameter[1];
  packetbytes[6] = Parameter[2];
  packetbytes[7] = Parameter[3];
  packetbytes[8] = command[0];
  packetbytes[9] = command[1];
  packetbytes[10] = GetLowByte(checksum);
  packetbytes[11] = GetHighByte(checksum);
 
  return packetbytes;
}
 
// Converts the int to bytes and puts them into the paramter array
void Command_Packet_ParameterFromInt(int i)
{
  Parameter[0] = (i & 0x000000ff);
  Parameter[1] = (i & 0x0000ff00) >> 8;
  Parameter[2] = (i & 0x00ff0000) >> 16;
  Parameter[3] = (i & 0xff000000) >> 24;
}
 
// Returns the high byte from a word
unsigned char Command_Packet_GetHighByte(unsigned int w)
{
  return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Command_Packet_GetLowByte(unsigned int w)
{
  return (unsigned char)w&0x00FF;
}
 
unsigned int Command_Packet__CalculateChecksum()
{
  unsigned int w = 0;
 
  w += COMMAND_START_CODE_1;
  w += COMMAND_START_CODE_2;
  w += COMMAND_DEVICE_ID_1;
  w += COMMAND_DEVICE_ID_2;
  w += Parameter[0];
  w += Parameter[1];
  w += Parameter[2];
  w += Parameter[3];
  w += command[0];
  w += command[1];
 
  return w;
}
};


Errors given are

Code: 
0 122 Compilation Started FPS Text.c
41 396 Invalid declarator expected'(' or identifier FPS Text.c
42 396 Invalid declarator expected'(' or identifier FPS Text.c
46 300 Syntax Error: ';' expected,  but '.' found FPS Text.c
46 398 Declarator error FPS Text.c
46 371 Specifier needed FPS Text.c
46 402 ; expected, but 'fpsCommand' found FPS Text.c
49 402 ; expected, but 'COMMAND_START_CODE_1' found FPS Text.c
49 402 ; expected, but '=' found FPS Text.c
49 371 Specifier needed FPS Text.c
49 396 Invalid declarator expected'(' or identifier FPS Text.c
50 402 ; expected, but 'COMMAND_START_CODE_2' found FPS Text.c
50 312 Internal error '' FPS Text.c
0 102 Finished (with errors): 16 Jan 2016, 16:20:09 FPS Text.mcp32

- - - Updated - - -

I came to know that functions cannot be used inside struct.

Here is my new code. I am getting error creating a enum like myFpsCommands.

Code C - [expand]
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struct Cmds_Packet {
    struct Commands {
        enum Commands_Enum {
            NotSet              = 0x00,   // Default value for enum. Scanner will return error if sent this.
            Open                = 0x01,   // Open Initialization
            Close               = 0x02,   // Close Termination
            UsbInternalCheck    = 0x03,   // UsbInternalCheck Check if the connected USB device is valid
            ChangeEBaudRate     = 0x04,   // ChangeBaudrate Change UART baud rate
            SetIAPMode          = 0x05,   // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
            CmosLed             = 0x12,   // CmosLed Control CMOS LED
            GetEnrollCount      = 0x20,   // Get enrolled fingerprint count
            CheckEnrolled       = 0x21,   // Check whether the specified ID is already enrolled
            EnrollStart         = 0x22,   // Start an enrollment
            Enroll1             = 0x23,   // Make 1st template for an enrollment
            Enroll2             = 0x24,   // Make 2nd template for an enrollment
            Enroll3             = 0x25,   // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
            IsPressFinger       = 0x26,   // Check if a finger is placed on the sensor
            DeleteID            = 0x40,   // Delete the fingerprint with the specified ID
            DeleteAll           = 0x41,   // Delete all fingerprints from the database
            Verify1_1           = 0x50,   // Verification of the capture fingerprint image with the specified ID
            Identify1_N         = 0x51,   // Identification of the capture fingerprint image with the database
            VerifyTemplate1_1   = 0x52,   // Verification of a fingerprint template with the specified ID
            IdentifyTemplate1_N = 0x53,   // Identification of a fingerprint template with the database
            CaptureFinger       = 0x60,   // Capture a fingerprint image(256x256) from the sensor
            MakeTemplate        = 0x61,   // Make template for transmission
            GetImage            = 0x62,   // Download the captured fingerprint image(256x256)
            GetRawImage         = 0x63,   // Capture & Download raw fingerprint image(320x240)
            GetTemplate         = 0x70,   // Download the template of the specified ID
            SetTemplate         = 0x71,   // Upload the template of the specified ID
            GetDatabaseStart    = 0x72,   // Start database download, obsolete
            GetDatabaseEnd      = 0x73,   // End database download, obsolete
            UpgradeFirmware     = 0x80,   // Not supported
            UpgradeISOCDImage   = 0x81,   // Not supported
            Ack                 = 0x30,   // Acknowledge.
            Nack                = 0x31    // Non-acknowledge
        }myCommands_Enum;
    }myCommands;
 
    myCommands.Commands_Enum myFpsCommands
 
    unsigned char Parameter[4];                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet  - never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet  - never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)             - theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)              - theoretically never changes
    unsigned char  command[2];                 // Command 2 bytes
}Commands_Packet;
 

The enum C statement is one of the simplest array fitters available at the language and it usage is somewhat intuitive; It is plenty documented on the Web. Have you tried at least to make this change yourself ?
 

'enum' just assigns a number to the variable sequentially from zero or a new starting value. It doesn't define a variable or allocate any storage for it. There is no point in assigning a value to every item in an 'enum' list because thats what the 'enum' does by itself.

However, your problem is that you are trying to create a stucture wrongly. A structure is one or more variables which are grouped together so they can be referred to as one entity. Your structure contains no variabes!

I'm guessing the list of items are individual commands which are held in variable as part of the structure. If I'm right, what you should do is '#define' them instead of enumerate them and then add a variable, lets call it 'MyCommand' to the structure as 'char MyCommand'. You can then set MyCommand to one of the values you defined.

If you want to create a structure which has storage for all of those items simultaneously, you need to give each a type so the compiler can allocate the correct storage space for them all.

Brian.
 
I am trying to post a C++ Arduino Library to C and I am having difficultier. The library is for GT-511CR Fingerprint Sensor. The Arduino Code works fine. I have tested it.

In C++ code there are Classes and enums. I have converted the classes to structs.

https://www.instructables.com/id/DIY-Fingerprint-Scanning-Garage-Door-Opener/

This is my new struct and it compiles file. I have created a struct variable Command.

I can also create a global pointer to this struct but I am not able to create a pointer to this struct inside a function. That is local pointer to struct.

Code C - [expand]
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struct Cmd_Packet {
    struct Cmds {
        enum Cmds_Enum {
              NotSet              = 0x00,                // Default value for enum. Scanner will return error if sent this.
              Open                = 0x01,                // Open Initialization
              Close               = 0x02,                // Close Termination
              UsbInternalCheck    = 0x03,                // UsbInternalCheck Check if the connected USB device is valid
              ChangeEBaudRate     = 0x04,                // ChangeBaudrate Change UART baud rate
              SetIAPMode          = 0x05,                // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
              CmosLed             = 0x12,                // CmosLed Control CMOS LED
              GetEnrollCount      = 0x20,                // Get enrolled fingerprint count
              CheckEnrolled       = 0x21,                // Check whether the specified ID is already enrolled
              EnrollStart         = 0x22,                // Start an enrollment
              Enroll1             = 0x23,                // Make 1st template for an enrollment
              Enroll2             = 0x24,                // Make 2nd template for an enrollment
              Enroll3             = 0x25,                // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
              IsPressFinger       = 0x26,                // Check if a finger is placed on the sensor
              DeleteID            = 0x40,                // Delete the fingerprint with the specified ID
              DeleteAll           = 0x41,                // Delete all fingerprints from the database
              Verify1_1           = 0x50,                // Verification of the capture fingerprint image with the specified ID
              Identify1_N         = 0x51,                // Identification of the capture fingerprint image with the database
              VerifyTemplate1_1   = 0x52,                // Verification of a fingerprint template with the specified ID
              IdentifyTemplate1_N = 0x53,                // Identification of a fingerprint template with the database
              CaptureFinger       = 0x60,                // Capture a fingerprint image(256x256) from the sensor
              MakeTemplate        = 0x61,                // Make template for transmission
              GetImage            = 0x62,                // Download the captured fingerprint image(256x256)
              GetRawImage         = 0x63,                // Capture & Download raw fingerprint image(320x240)
              GetTemplate         = 0x70,                // Download the template of the specified ID
              SetTemplate         = 0x71,                // Upload the template of the specified ID
              GetDatabaseStart    = 0x72,                // Start database download, obsolete
              GetDatabaseEnd      = 0x73,                // End database download, obsolete
              UpgradeFirmware     = 0x80,                // Not supported
              UpgradeISOCDImage   = 0x81,                // Not supported
              Ack                 = 0x30,                // Acknowledge.
              Nack                = 0x31                 // Non-acknowledge
         }Command;
    }Commands;
 
    unsigned char Parameter[4];                                                                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
    unsigned char command[2];                  // Command 2 bytes
}Command_packet;
 

Again it's most likely a trivial violation of C syntax rules, as in your first post.

Unfortunately we need to guess what you are exactly doing. Why don't you show the failing code, marking the error location?

- - - Updated - - -

You don't need to repeat the definition of the command_packet struct variable, just show how you reference it.

If you want to make multiple instances of or pointers to a structured variable, you'll preferably define the type first (using typedef) and then the variable instance(s) and pointers. If you need to access sub entities through pointers, use multiple hierarchical typedefs to define the structure.
 
Line 104 and 340 are giving errors. If I comment line 140 and also the function starting at line 340 then code compiles fine and also the test code which Opens the Sensor and Toggles the Sensor's CmosLED are working.

Code C - [expand]
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#define bool unsigned char
#define uint8_t unsigned char
 
#define TRUE 1
#define FALSE 0
 
bool UseSerialDebug;
 
//Command_Packet represents the 12 byte command that we send to the finger print scanner
 
struct Cmd_Packet {
    struct Cmds {
        enum Cmds_Enum {
              NotSet              = 0x00,                // Default value for enum. Scanner will return error if sent this.
              Open                = 0x01,                // Open Initialization
              Close               = 0x02,                // Close Termination
              UsbInternalCheck    = 0x03,                // UsbInternalCheck Check if the connected USB device is valid
              ChangeEBaudRate     = 0x04,                // ChangeBaudrate Change UART baud rate
              SetIAPMode          = 0x05,                // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
              CmosLed             = 0x12,                // CmosLed Control CMOS LED
              GetEnrollCount      = 0x20,                // Get enrolled fingerprint count
              CheckEnrolled       = 0x21,                // Check whether the specified ID is already enrolled
              EnrollStart         = 0x22,                // Start an enrollment
              Enroll1             = 0x23,                // Make 1st template for an enrollment
              Enroll2             = 0x24,                // Make 2nd template for an enrollment
              Enroll3             = 0x25,                // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
              IsPressFinger       = 0x26,                // Check if a finger is placed on the sensor
              DeleteID            = 0x40,                // Delete the fingerprint with the specified ID
              DeleteAll           = 0x41,                // Delete all fingerprints from the database
              Verify1_1           = 0x50,                // Verification of the capture fingerprint image with the specified ID
              Identify1_N         = 0x51,                // Identification of the capture fingerprint image with the database
              VerifyTemplate1_1   = 0x52,                // Verification of a fingerprint template with the specified ID
              IdentifyTemplate1_N = 0x53,                // Identification of a fingerprint template with the database
              CaptureFinger       = 0x60,                // Capture a fingerprint image(256x256) from the sensor
              MakeTemplate        = 0x61,                // Make template for transmission
              GetImage            = 0x62,                // Download the captured fingerprint image(256x256)
              GetRawImage         = 0x63,                // Capture & Download raw fingerprint image(320x240)
              GetTemplate         = 0x70,                // Download the template of the specified ID
              SetTemplate         = 0x71,                // Upload the template of the specified ID
              GetDatabaseStart    = 0x72,                // Start database download, obsolete
              GetDatabaseEnd      = 0x73,                // End database download, obsolete
              UpgradeFirmware     = 0x80,                // Not supported
              UpgradeISOCDImage   = 0x81,                // Not supported
              Ack                 = 0x30,                // Acknowledge.
              Nack                = 0x31                 // Non-acknowledge
         }Command;
    }Commands;
 
    unsigned char Parameter[4];                                                                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
    unsigned char command[2];                  // Command 2 bytes
}Command_packet;
 
struct Resp_Packet {
    struct ErrCodes {
       enum Errs_Enum {
          NO_ERROR                    = 0x0000,        // Default value. no error
          NACK_TIMEOUT                = 0x1001,        // Obsolete, capture timeout
          NACK_INVALID_BAUDRATE       = 0x1002,        // Obsolete, Invalid serial baud rate
          NACK_INVALID_POS            = 0x1003,        // The specified ID is not between 0~199
          NACK_IS_NOT_USED            = 0x1004,        // The specified ID is not used
          NACK_IS_ALREADY_USED        = 0x1005,        // The specified ID is already used
          NACK_COMM_ERR               = 0x1006,        // Communication Error
          NACK_VERIFY_FAILED          = 0x1007,        // 1:1 Verification Failure
          NACK_IDENTIFY_FAILED        = 0x1008,        // 1:N Identification Failure
          NACK_DB_IS_FULL             = 0x1009,        // The database is full
          NACK_DB_IS_EMPTY            = 0x100A,        // The database is empty
          NACK_TURN_ERR               = 0x100B,        // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
          NACK_BAD_FINGER             = 0x100C,        // Too bad fingerprint
          NACK_ENROLL_FAILED          = 0x100D,        // Enrollment Failure
          NACK_IS_NOT_SUPPORTED       = 0x100E,        // The specified command is not supported
          NACK_DEV_ERR                = 0x100F,        // Device Error, especially if Crypto-Chip is trouble
          NACK_CAPTURE_CANCELED       = 0x1010,        // Obsolete, The capturing is canceled
          NACK_INVALID_PARAM          = 0x1011,        // Invalid parameter
          NACK_FINGER_IS_NOT_PRESSED  = 0x1012,        // Finger is not pressed
          INVALID                     = 0XFFFF         // Used when parsing fails
       }Error, e;
 
 
    }ErrorCodes;
    
    //Response_Packet(unsigned char* buffer, bool UseSerialDebug);
    unsigned char RawBytes[12];
    unsigned char ParameterBytes[4];
    unsigned char ResponseBytes[2];
    bool ACK;
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;        // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;        // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
 
}Response_Packet;
 
unsigned char* Command_Packet_GetPacketBytes();                                                        // returns the bytes to be transmitted
void Command_Packet_ParameterFromInt(int i);
unsigned int Command_Packet_CalculateChecksum();                                                // Checksum is calculated using byte addition
unsigned char Command_Packet_GetHighByte(unsigned int w);
unsigned char Command_Packet_GetLowByte(unsigned int w);
 
enum Response_Packet.ErrorCodes.Error Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low);
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug);
 
int Response_Packet_IntFromParameter();
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug);
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length);
unsigned char Response_Packet_GetHighByte(unsigned int w);
unsigned char Response_Packet_GetLowByte(unsigned int w);
 
//Initialises the device and gets ready for commands
void FPS_GT511C3_Open();
 
// Does not actually do anything (according to the datasheet)
// I implemented open, so had to do closed too... lol
void FPS_GT511C3_Close();
 
// Turns on or off the LED backlight
// LED must be on to see fingerprints
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on);
 
// Changes the baud rate of the connection
// Parameter: 9600 - 115200
// Returns: True if success, false if invalid baud
// NOTE: Untested (don't have a logic level changer and a voltage divider is too slow)
bool FPS_GT511C3_ChangeBaudRate(int baud);
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount();
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id);
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id);
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1();
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2();
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3();
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger();
 
// Deletes the specified ID (enrollment) from the database
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int ID);
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll();
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id);
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N();
 
// Captures the currently pressed finger into onboard ram
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality);
 
//-= Not implemented commands =-
 
// Gets an image that is 258x202 (52116 bytes) and returns it in 407 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetImage();
 
// Gets an image that is qvga 160x120 (19200 bytes) and returns it in 150 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetRawImage();
 
// Gets a template from the fps (498 bytes) in 4 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Parameter: 0-199 ID number
// Returns:
//        0 - ACK Download starting
//        1 - Invalid position
//        2 - ID not used (no template to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int GetTemplate(int id);
 
// Uploads a template to the fps
// Parameter: the template (498 bytes)
// Parameter: the ID number to upload
// Parameter: Check for duplicate fingerprints already on fps
// Returns:
//        0-199 - ID duplicated
//        200 - Uploaded ok (no duplicate if enabled)
//        201 - Invalid position
//        202 - Communications error
//        203 - Device error
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int SetTemplate(byte* tmplt, int id, bool duplicateCheck);
 
// Commands that are not implemented (and why)
// VerifyTemplate1_1 - Couldn't find a good reason to implement this on an arduino
// IdentifyTemplate1_N - Couldn't find a good reason to implement this on an arduino
// MakeTemplate - Couldn't find a good reason to implement this on an arduino
// UsbInternalCheck - not implemented - Not valid config for arduino
// GetDatabaseStart - historical command, no longer supported
// GetDatabaseEnd - historical command, no longer supported
// UpgradeFirmware - Data Sheet says not supported
// UpgradeISOCDImage - Data Sheet says not supported
// SetIAPMode - for upgrading firmware (which is not supported)
// Ack and Nack        are listed as a commands for some unknown reason... not implemented
 
void FPS_GT511C3_serialPrintHex(unsigned char data_);
void FPS_GT511C3_SendToSerial(unsigned char data[], int length);
 
// resets the Data_Packet class, and gets ready to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//void StartDataDownload();
 
// Returns the next data packet
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//Data_Packet GetNextDataPacket();
 
void SendCommand(unsigned char cmd[], int length);
void GetResponse();
 
unsigned char* Command_Packet_GetPacketBytes() {
    unsigned char packetbytes[12];
    unsigned int cmd, checksum;
    // update command before calculating checksum (important!)
    cmd = Command_packet.Commands.Command;
    Command_Packet.command[0] = Command_Packet_GetLowByte(cmd);
    Command_Packet.command[1] = Command_Packet_GetHighByte(cmd);
 
    checksum = Command_Packet_CalculateChecksum();
 
    packetbytes[0] = Command_Packet.COMMAND_START_CODE_1;
    packetbytes[1] = Command_Packet.COMMAND_START_CODE_2;
    packetbytes[2] = Command_Packet.COMMAND_DEVICE_ID_1;
    packetbytes[3] = Command_Packet.COMMAND_DEVICE_ID_2;
    packetbytes[4] = Command_Packet.Parameter[0];
    packetbytes[5] = Command_Packet.Parameter[1];
    packetbytes[6] = Command_Packet.Parameter[2];
    packetbytes[7] = Command_Packet.Parameter[3];
    packetbytes[8] = Command_Packet.command[0];
    packetbytes[9] = Command_Packet.command[1];
    packetbytes[10] = Command_Packet_GetLowByte(checksum);
    packetbytes[11] = Command_Packet_GetHighByte(checksum);
 
    return &packetbytes;
}
 
// Converts the int to bytes and puts them into the paramter array
void Command_Packet_ParameterFromInt(int i) {
    Command_Packet.Parameter[0] = (i & 0x000000ff);
    Command_Packet.Parameter[1] = (i & 0x0000ff00) >> 8;
    Command_Packet.Parameter[2] = (i & 0x00ff0000) >> 16;
    Command_Packet.Parameter[3] = (i & 0xff000000) >> 24;
}
 
// Returns the high byte from a word
unsigned char Command_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Command_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
unsigned int Command_Packet_CalculateChecksum() {
    unsigned int w = 0;
 
    w += Command_Packet.COMMAND_START_CODE_1;
    w += Command_Packet.COMMAND_START_CODE_2;
    w += Command_Packet.COMMAND_DEVICE_ID_1;
    w += Command_Packet.COMMAND_DEVICE_ID_2;
    w += Command_Packet.Parameter[0];
    w += Command_Packet.Parameter[1];
    w += Command_Packet.Parameter[2];
    w += Command_Packet.Parameter[3];
    w += Command_Packet.command[0];
    w += Command_Packet.command[1];
 
    return w;
}
 
// parses bytes into one of the possible errors from the finger print scanner
//Response_Packet::ErrorCodes::Errors_Enum Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low)
enum Response_Packet.ErrorCodes.Error Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low) {
    Response_Packet.ErrorCodes.e = INVALID;
 
    if (high == 0x00)
    {
    }
    // grw 01/03/15 - replaced if clause with else clause for any non-zero high byte
    // if (high == 0x01)
    // {
    else {
        switch(low) {
            case 0x00: Response_Packet.ErrorCodes.e = NO_ERROR; break;
            case 0x01: Response_Packet.ErrorCodes.e = NACK_TIMEOUT; break;
            case 0x02: Response_Packet.ErrorCodes.e = NACK_INVALID_BAUDRATE; break;
            case 0x03: Response_Packet.ErrorCodes.e = NACK_INVALID_POS; break;
            case 0x04: Response_Packet.ErrorCodes.e = NACK_IS_NOT_USED; break;
            case 0x05: Response_Packet.ErrorCodes.e = NACK_IS_ALREADY_USED; break;
            case 0x06: Response_Packet.ErrorCodes.e = NACK_COMM_ERR; break;
            case 0x07: Response_Packet.ErrorCodes.e = NACK_VERIFY_FAILED; break;
            case 0x08: Response_Packet.ErrorCodes.e = NACK_IDENTIFY_FAILED; break;
            case 0x09: Response_Packet.ErrorCodes.e = NACK_DB_IS_FULL; break;
            case 0x0A: Response_Packet.ErrorCodes.e = NACK_DB_IS_EMPTY; break;
            case 0x0B: Response_Packet.ErrorCodes.e = NACK_TURN_ERR; break;
            case 0x0C: Response_Packet.ErrorCodes.e = NACK_BAD_FINGER; break;
            case 0x0D: Response_Packet.ErrorCodes.e = NACK_ENROLL_FAILED; break;
            case 0x0E: Response_Packet.ErrorCodes.e = NACK_IS_NOT_SUPPORTED; break;
            case 0x0F: Response_Packet.ErrorCodes.e = NACK_DEV_ERR; break;
            case 0x10: Response_Packet.ErrorCodes.e = NACK_CAPTURE_CANCELED; break;
            case 0x11: Response_Packet.ErrorCodes.e = NACK_INVALID_PARAM; break;
            case 0x12: Response_Packet.ErrorCodes.e = NACK_FINGER_IS_NOT_PRESSED; break;
        };
    }
 
    return Response_Packet.ErrorCodes.e;
}
 
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if (buffer[8] == 0x30) Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}
 
// Gets an int from the parameter bytes
int Response_Packet_IntFromParameter() {
    int retval = 0;
 
    retval = (retval << 8) + Response_Packet.ParameterBytes[3];
    retval = (retval << 8) + Response_Packet.ParameterBytes[2];
    retval = (retval << 8) + Response_Packet.ParameterBytes[1];
    retval = (retval << 8) + Response_Packet.ParameterBytes[0];
 
    return retval;
}
 
// calculates the checksum from the bytes in the Packet
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
    
    for(i = 0; i < length; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}
 
// Returns the high byte from a word
unsigned char Response_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Response_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
// checks to see if the byte is the proper value, and logs it to the serial channel if not
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug) {
    bool retval;
    char str[22];
    
    retval = (b != propervalue) && (b != alternatevalue);
    
    if((UseSerialDebug) && (retval)) {
        UART5_Write_Text("Response_Packet parsing error \r\n");
        UART5_Write_Text(varname);
        UART5_Write_Text(" ");
        ByteToHex(propervalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" || ");
        ByteToHex(alternatevalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" != ");
        ByteToHex(b, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
    }
}
void FPS_GT511C3_SendCommand(unsigned char cmd[], int length) {
    unsigned int i = 0;
 
    for(i = 0; i < length; i++) {
         UART2_Write(cmd[i]);
    }
 
    if(UseSerialDebug) {
        UART5_Write_Text("FPS - SEND: ");
        for(i = 0; i < length; i++) {
           UART5_Write(cmd[i]);
        }
 
        UART5_Write_Text("\r\n");
    }
}
 
// sends a byte to the serial debugger in the hex format we want EX "0F"
void FPS_GT511C3_serialPrintHex(unsigned char data_) {
    char tmp[16];
    ByteToHex(tmp, data_);
    Ltrim(tmp);
    Rtrim(tmp);
    UART5_Write_Text(tmp);
}
 
// sends the bye aray to the serial debugger in our hex format EX: "00 AF FF 10 00 13"
void FPS_GT511C3_SendToSerial(unsigned char data_[], int length) {
    bool first = TRUE;
    unsigned int i;
 
    UART5_Write_Text(""");
 
    for(i = 0; i < length; i++) {
       if(first)first = FALSE;
       else UART5_Write_Text(" ");
       FPS_GT511C3_serialPrintHex(data_[i]);
    }
 
    UART5_Write_Text(""");
}
 
// Gets the response to the command from the software serial channel (and waits for it)
void FPS_GT511C3_GetResponse() {
    unsigned char firstbyte = 0;
    bool done = FALSE;
    unsigned char resp[12];
    unsigned int i;
 
    while(done == FALSE) {
       firstbyte = (unsigned char)UART2_Read();
 
       if(firstbyte == Response_Packet.COMMAND_START_CODE_1) {
            done = TRUE;
       }
    }
 
    resp[0] = firstbyte;
 
    for(i = 1; i < 12; i++) {
          resp[i]= (unsigned char)UART2_Read();
    }
 
    Response_Packet_Response_Packet(resp, UseSerialDebug);
 
    if(UseSerialDebug) {
              UART5_Write_Text("FPS - RECV: ");
              FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
              UART5_Write_Text("\r\n");
              UART5_Write_Text("\r\n");
    }
}
 
bool FPS_GT511C3_ChangeBaudRate(int baud) {
    unsigned char* Packetbytes;
    bool retval;
    
    if((baud == 9600) || (baud == 19200) || (baud == 38400) || (baud == 57600) || (baud == 115200)) {
        if(UseSerialDebug)UART5_Write_Text("FPS - ChangeBaudRate\r\n");
        Command_Packet.Commands.Command = Open;
        Command_Packet_ParameterFromInt(baud);
        Packetbytes = Command_Packet_GetPacketBytes();
        FPS_GT511C3_SendCommand(Packetbytes, 12);
        FPS_GT511C3_GetResponse();
        retval = Response_Packet.ACK;
        
        if(retval) {
            UART2_Init(baud);
            Delay_ms(200);
        }
 
        return retval;
    }
    
    return FALSE;
}
 
void FPS_GT511C3_Open() {
    unsigned char* Packetbytes;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Open\r\n");
    Command_Packet.Commands.Command = Open;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
}
 
// Turns on or off the LED backlight
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on) {
    unsigned char* Packetbytes;
    bool retval;
    
    Command_Packet.Commands.Command = CmosLed;
    
    if(on) {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED on\r\n");
       Command_Packet.Parameter[0] = 0x01;
    }
    else {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED off\r\n");
       Command_Packet.Parameter[0] = 0x00;
    }
    
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = TRUE;
    if(Response_Packet.ACK == FALSE)retval = FALSE;
    return retval;
}
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - GetEnrolledCount\r\n");
    Command_Packet.Commands.Command = GetEnrollCount;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
 
    retval = Response_Packet_IntFromParameter();
    return retval;
}
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id) {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - CheckEnrolled\r\n");
    Command_Packet.Commands.Command = CheckEnrolled;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = FALSE;
    retval = Response_Packet.ACK;
    return retval;
}
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - EnrollStart\r\n");
    Command_Packet.Commands.Command = EnrollStart;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = 0;
    /*
    if(Response_Packet.ACK == FALSE)
    {
            if (if (rp->Error == Response_Packet::ErrorCodes::NACK_DB_IS_FULL) retval = 1;
            if (if (rp->Error ==  Response_Packet::ErrorCodes::NACK_INVALID_POS) retval = 2;
            if (if (rp->Error ==  Response_Packet::ErrorCodes::NACK_IS_ALREADY_USED) retval = 3;
    }
    */
    return retval;
}
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll1;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet_IntFromParameter();
    
    if(retval < 200) retval = 3; else retval = 0;
    /*
    if(Response_Packet.ACK == FALSE)
    {
          if (rp->Error == Response_Packet::ErrorCodes::NACK_ENROLL_FAILED) retval = 1;
          if (rp->Error == Response_Packet::ErrorCodes::NACK_BAD_FINGER) retval = 2;
    }
    */
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll2;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
    /*
    if(Response_Packet.ACK == FALSE)
    {
          if (rp->Error == Response_Packet::ErrorCodes::NACK_ENROLL_FAILED) retval = 1;
          if (rp->Error == Response_Packet::ErrorCodes::NACK_BAD_FINGER) retval = 2;
    }
    */
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll3;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
    /*
    if(Response_Packet.ACK == FALSE)
    {
          if (rp->Error == Response_Packet::ErrorCodes::NACK_ENROLL_FAILED) retval = 1;
          if (rp->Error == Response_Packet::ErrorCodes::NACK_BAD_FINGER) retval = 2;
    }
    */
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger() {
    unsigned char* Packetbytes;
    bool retval;
    int pval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - IsPressFinger\r\n");
    Command_Packet.Commands.Command = IsPressFinger;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = FALSE;
    pval = Response_Packet.ParameterBytes[0];
    pval += Response_Packet.ParameterBytes[1];
    pval += Response_Packet.ParameterBytes[2];
    pval += Response_Packet.ParameterBytes[3];
    
    if(pval == 0)retval = TRUE;
 
    return retval;
}
 
// Deletes the specified ID (enrollment) from the database
// Parameter: 0-199 (id number to be deleted)
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int id) {
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteID\r\n");
    Command_Packet.Commands.Command = DeleteID;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll() {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteAll\r\n");
    Command_Packet.Commands.Command = DeleteAll;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Verify1_1\r\n");
    Command_Packet.Commands.Command = Verify1_1;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = 0;
    
    /*
    if(Response_Packet.ACK == FALSE)
    {
          retval = 3; // grw 01/03/15 - set default value of not verified before assignment
          if (rp->Error == Response_Packet::ErrorCodes::NACK_INVALID_POS) retval = 1;
          if (rp->Error == Response_Packet::ErrorCodes::NACK_IS_NOT_USED) retval = 2;
          if (rp->Error == Response_Packet::ErrorCodes::NACK_VERIFY_FAILED) retval = 3;
    }
    */
 
    return retval;
}
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Identify1_N\r\n");
    Command_Packet.Commands.Command = Identify1_N;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet_IntFromParameter();
    
    if(retval > 200) retval = 200;
 
    return retval;
}
 
// Captures the currently pressed finger into onboard ram use this prior to other commands
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality) {
 
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - CaptureFinger\r\n");
    Command_Packet.Commands.Command = CaptureFinger;
    if(highquality) {
        Command_Packet_ParameterFromInt(1);
    }
    else {
        Command_Packet_ParameterFromInt(0);
    }
    
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
void Enroll() {
     // Enroll test
 
    // find open enroll id
    int enrollid = 0;
    int bret, iret;
    bool usedid = TRUE;
    
    while(usedid == TRUE) {
        usedid = FPS_GT511C3_CheckEnrolled(enrollid);
        if (usedid == TRUE)enrollid++;
    }
    
    FPS_GT511C3_EnrollStart(enrollid);
 
    // enroll
    UART_Write_Text("Press finger to Enroll #");
    UART_Write_Text(enrollid);
    UART_Write_Text("\r\n");
    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
    bret = FPS_GT511C3_CaptureFinger(TRUE);
    iret = 0;
    
    if(bret != FALSE) {
            UART5_Write_Text("Remove finger\r\n");
            FPS_GT511C3_Enroll1();
            while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
            UART5_Write_Text("Press same finger again\r\n");
            while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
            bret = FPS_GT511C3_CaptureFinger(TRUE);
            
            if(bret != FALSE)
            {
                    UART5_Write_Text("Remove finger\r\n");
                    FPS_GT511C3_Enroll2();
                    while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
                    UART5_Write_Text("Press same finger yet again\r\n");
                    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
                    bret = FPS_GT511C3_CaptureFinger(TRUE);
                    if (bret != FALSE)
                    {
                            UART5_Write_Text("Remove finger\r\n");
                            iret = FPS_GT511C3_Enroll3();
                            if (iret == 0)
                            {
                                    UART5_Write_Text("Enrolling Successfull\r\n");
                            }
                            else
                            {
                                    UART5_Write_Text("Enrolling Failed with error code:");
                                    UART5_Write_Text(iret);
                                    UART5_Write_Text("\r\n");
                            }
                    }
                    else UART5_Write_Text("Failed to capture third finger\r\n");
            }
            else UART5_Write_Text("Failed to capture second finger\r\n");
    }
    else UART5_Write_Text("Failed to capture first finger\r\n");
}
 
void main() {
 
    AD1PCFG = 0xFFFF;
    JTAGEN_bit = 0;
    
    Command_Packet.COMMAND_START_CODE_1 = 0x55;
    Command_Packet.COMMAND_START_CODE_2 = 0xAA;
    Command_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Command_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    Response_Packet.COMMAND_START_CODE_1 = 0x55;
    Response_Packet.COMMAND_START_CODE_2 = 0xAA;
    Response_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Response_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    UART5_Init(9600);
    Delay_ms(200);
    UART2_Init(9600);
    Delay_ms(200);
    
    U2IP0_bit = 0;                     // Set UART2 interrupt
    U2IP1_bit = 1;                     // Set interrupt priorities
    U2IP2_bit = 1;                     // Set UART2 interrupt to level 6
 
 
    U2RXIE_bit = 1;
    Delay_ms(200);
    U2RXIF_bit = 0;
    EnableInterrupts();       // Enable all interrupts
    
    UseSerialDebug = TRUE;
    
    UART5_Write_Text("UART5 Ready...");
    
    FPS_GT511C3_Open();
    Delay_ms(200);
    FPS_GT511C3_SetLED(1);
    Delay_ms(200);
 
    while(1) {
    
          Delay_ms(5000);
          Enroll();
    }
}


This is the code of one of the C++ functions. I want to do similar thing using C. That is I want to use Arrow Operator and do a similar coding.

C++ Code

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void FPS_GT511C3::Open()
{
    if (UseSerialDebug) Serial.println("FPS - Open");
    Command_Packet* cp = new Command_Packet();
    cp->Command = Command_Packet::Commands::Open;
    cp->Parameter[0] = 0x00;
    cp->Parameter[1] = 0x00;
    cp->Parameter[2] = 0x00;
    cp->Parameter[3] = 0x00;
    byte* packetbytes = cp->GetPacketBytes();
    SendCommand(packetbytes, 12);
    Response_Packet* rp = GetResponse();
    delete rp;
    delete packetbytes;
}
 
Last edited:

That's not possible in C.

1. an enum isn't a type, it's a list of constants. An enum value can be assigned to an integer type (char, int etc.). If you want to return an enum value by a function, the function must be defined with an integer return type.

2. Command_Packet and Response_Packet are structured variable definitions, not type definitions. You can't reference them to define other variables, except for instances of the outer level using the tag name. And you can't use a subentity of struct respectively typedef struct as a new type.

As suggested before, I would cut the C++ class definition into hierarchical typedefs, so you can easily access sub entities.

Don't try to put the enum definition into the struct, define it on it's own and use it where appropriate. Other than in C++, the enums are sharing a single global namespace, so each name must be unique.
 
Please show how to do that.

- - - Updated - - -

I changed the return type to unsigned int and it worked. But still the enrolling is not happening. Have to debug the code and see what is causing the problem. Maybe I have to use Serial Interrupt to receive the data.

Code C - [expand]
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// parses bytes into one of the possible errors from the finger print scanner
//Response_Packet::ErrorCodes::Errors_Enum Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low)
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low) {
    Response_Packet.ErrorCodes.e = INVALID;
 
    if (high == 0x00)
    {
    }
    // grw 01/03/15 - replaced if clause with else clause for any non-zero high byte
    // if (high == 0x01)
    // {
    else {
        switch(low) {
            case 0x00: Response_Packet.ErrorCodes.e = NO_ERROR; break;
            case 0x01: Response_Packet.ErrorCodes.e = NACK_TIMEOUT; break;
            case 0x02: Response_Packet.ErrorCodes.e = NACK_INVALID_BAUDRATE; break;
            case 0x03: Response_Packet.ErrorCodes.e = NACK_INVALID_POS; break;
            case 0x04: Response_Packet.ErrorCodes.e = NACK_IS_NOT_USED; break;
            case 0x05: Response_Packet.ErrorCodes.e = NACK_IS_ALREADY_USED; break;
            case 0x06: Response_Packet.ErrorCodes.e = NACK_COMM_ERR; break;
            case 0x07: Response_Packet.ErrorCodes.e = NACK_VERIFY_FAILED; break;
            case 0x08: Response_Packet.ErrorCodes.e = NACK_IDENTIFY_FAILED; break;
            case 0x09: Response_Packet.ErrorCodes.e = NACK_DB_IS_FULL; break;
            case 0x0A: Response_Packet.ErrorCodes.e = NACK_DB_IS_EMPTY; break;
            case 0x0B: Response_Packet.ErrorCodes.e = NACK_TURN_ERR; break;
            case 0x0C: Response_Packet.ErrorCodes.e = NACK_BAD_FINGER; break;
            case 0x0D: Response_Packet.ErrorCodes.e = NACK_ENROLL_FAILED; break;
            case 0x0E: Response_Packet.ErrorCodes.e = NACK_IS_NOT_SUPPORTED; break;
            case 0x0F: Response_Packet.ErrorCodes.e = NACK_DEV_ERR; break;
            case 0x10: Response_Packet.ErrorCodes.e = NACK_CAPTURE_CANCELED; break;
            case 0x11: Response_Packet.ErrorCodes.e = NACK_INVALID_PARAM; break;
            case 0x12: Response_Packet.ErrorCodes.e = NACK_FINGER_IS_NOT_PRESSED; break;
        };
    }
 
    return Response_Packet.ErrorCodes.e;
}
 

I have a new problem.

I converted this piece of C++ Code to C code using Interrupts but I see that if I don't check for response then everything works fine but if I check for response then it doesn't work in hardware. Also I see that in the resp[] buffer the received bytes are one element shifted.

C++ Code

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// Gets the response to the command from the software serial channel (and waits for it)
Response_Packet* FPS_GT511C3::GetResponse()
{
    byte firstbyte = 0;
    bool done = false;
    _serial.listen();
    while (done == false)
    {
        firstbyte = (byte)_serial.read();
        if (firstbyte == Response_Packet::COMMAND_START_CODE_1)
        {
            done = true;
        }
    }
    byte* resp = new byte[12];
    resp[0] = firstbyte;
    for (int i=1; i < 12; i++)
    {
        while (_serial.available() == false) delay(10);
        resp[i]= (byte) _serial.read();
    }
    Response_Packet* rp = new Response_Packet(resp, UseSerialDebug);
    delete resp;
    if (UseSerialDebug) 
    {
        Serial.print("FPS - RECV: ");
        SendToSerial(rp->RawBytes, 12);
        Serial.println();
        Serial.println();
    }
    return rp;
};


Converted C Code

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unsigned char resp[20];
unsigned char gfirstbyte = 0;
bool gdone = FALSE;
unsigned gIndex = 1;
 
 
// Gets the response to the command from the software serial channel (and waits for it)
void FPS_GT511C3_GetResponse() {
    /*
    unsigned char firstbyte = 0;
    bool done = FALSE;
    unsigned char resp[12];
    unsigned int i;
 
    while(done == FALSE) {
       firstbyte = (unsigned char)UART2_Read();
 
       if(firstbyte == Response_Packet.COMMAND_START_CODE_1) {
            done = TRUE;
       }
    }
 
    resp[0] = firstbyte;
 
    for(i = 1; i < 12; i++) {
          resp[i]= (unsigned char)UART2_Read();
    }
    */
    Delay_ms(2000);
    Response_Packet_Response_Packet(resp, UseSerialDebug);
 
    if(UseSerialDebug) {
         UART5_Write_Text("FPS - RECV: ");
         FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
         UART5_Write_Text("\r\n");
         UART5_Write_Text("\r\n");
    }
}
 
 
 
 
void UART2() iv IVT_UART_2 ilevel 2 ics ICS_AUTO {
    
    if(gdone = TRUE) {
       resp[gIndex++]= UART2_Read();
    }
    else if(gdone == FALSE) {
       gfirstbyte = UART2_Read();
 
       if(gfirstbyte == Response_Packet.COMMAND_START_CODE_1) {
            resp[0] = gfirstbyte;
            gIndex = 1;
            gdone = TRUE;
       }
    }
    
    U2RXIF_bit = 0;
}
 
 
void FPS_GT511C3_Open() {
    unsigned char* Packetbytes;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Open\r\n");
    Command_Packet.Commands.Command = Open;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    PrintResponseBytes(resp);
    ResetVars();
}
 
// Turns on or off the LED backlight
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on) {
    unsigned char* Packetbytes;
    bool retval;
    
    Command_Packet.Commands.Command = CmosLed;
    
    if(on) {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED on\r\n");
       Command_Packet.Parameter[0] = 0x01;
    }
    else {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED off\r\n");
       Command_Packet.Parameter[0] = 0x00;
    }
    
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = TRUE;
    if(Response_Packet.ACK == FALSE)retval = FALSE;
    return retval;
}



Latest Full Code is here.

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#define bool unsigned char
#define uint8_t unsigned char
 
#define TRUE 1
#define FALSE 0
 
unsigned char resp[20];
unsigned char gfirstbyte = 0;
bool gdone = FALSE;
unsigned gIndex = 1;
 
bool UseSerialDebug;
 
//Command_Packet represents the 12 byte command that we send to the finger print scanner
 
struct Cmd_Packet {
    struct Cmds {
        enum Cmds_Enum {
              NotSet              = 0x00,                // Default value for enum. Scanner will return error if sent this.
              Open                = 0x01,                // Open Initialization
              Close               = 0x02,                // Close Termination
              UsbInternalCheck    = 0x03,                // UsbInternalCheck Check if the connected USB device is valid
              ChangeEBaudRate     = 0x04,                // ChangeBaudrate Change UART baud rate
              SetIAPMode          = 0x05,                // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
              CmosLed             = 0x12,                // CmosLed Control CMOS LED
              GetEnrollCount      = 0x20,                // Get enrolled fingerprint count
              CheckEnrolled       = 0x21,                // Check whether the specified ID is already enrolled
              EnrollStart         = 0x22,                // Start an enrollment
              Enroll1             = 0x23,                // Make 1st template for an enrollment
              Enroll2             = 0x24,                // Make 2nd template for an enrollment
              Enroll3             = 0x25,                // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
              IsPressFinger       = 0x26,                // Check if a finger is placed on the sensor
              DeleteID            = 0x40,                // Delete the fingerprint with the specified ID
              DeleteAll           = 0x41,                // Delete all fingerprints from the database
              Verify1_1           = 0x50,                // Verification of the capture fingerprint image with the specified ID
              Identify1_N         = 0x51,                // Identification of the capture fingerprint image with the database
              VerifyTemplate1_1   = 0x52,                // Verification of a fingerprint template with the specified ID
              IdentifyTemplate1_N = 0x53,                // Identification of a fingerprint template with the database
              CaptureFinger       = 0x60,                // Capture a fingerprint image(256x256) from the sensor
              MakeTemplate        = 0x61,                // Make template for transmission
              GetImage            = 0x62,                // Download the captured fingerprint image(256x256)
              GetRawImage         = 0x63,                // Capture & Download raw fingerprint image(320x240)
              GetTemplate         = 0x70,                // Download the template of the specified ID
              SetTemplate         = 0x71,                // Upload the template of the specified ID
              GetDatabaseStart    = 0x72,                // Start database download, obsolete
              GetDatabaseEnd      = 0x73,                // End database download, obsolete
              UpgradeFirmware     = 0x80,                // Not supported
              UpgradeISOCDImage   = 0x81,                // Not supported
              Ack                 = 0x30,                // Acknowledge.
              Nack                = 0x31                 // Non-acknowledge
         }Command;
    }Commands;
 
    unsigned char Parameter[4];                                                                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
    unsigned char command[2];                  // Command 2 bytes
}Command_packet;
 
struct Resp_Packet {
    struct ErrCodes {
       enum Errs_Enum {
          NO_ERROR                    = 0x0000,        // Default value. no error
          NACK_TIMEOUT                = 0x1001,        // Obsolete, capture timeout
          NACK_INVALID_BAUDRATE       = 0x1002,        // Obsolete, Invalid serial baud rate
          NACK_INVALID_POS            = 0x1003,        // The specified ID is not between 0~199
          NACK_IS_NOT_USED            = 0x1004,        // The specified ID is not used
          NACK_IS_ALREADY_USED        = 0x1005,        // The specified ID is already used
          NACK_COMM_ERR               = 0x1006,        // Communication Error
          NACK_VERIFY_FAILED          = 0x1007,        // 1:1 Verification Failure
          NACK_IDENTIFY_FAILED        = 0x1008,        // 1:N Identification Failure
          NACK_DB_IS_FULL             = 0x1009,        // The database is full
          NACK_DB_IS_EMPTY            = 0x100A,        // The database is empty
          NACK_TURN_ERR               = 0x100B,        // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
          NACK_BAD_FINGER             = 0x100C,        // Too bad fingerprint
          NACK_ENROLL_FAILED          = 0x100D,        // Enrollment Failure
          NACK_IS_NOT_SUPPORTED       = 0x100E,        // The specified command is not supported
          NACK_DEV_ERR                = 0x100F,        // Device Error, especially if Crypto-Chip is trouble
          NACK_CAPTURE_CANCELED       = 0x1010,        // Obsolete, The capturing is canceled
          NACK_INVALID_PARAM          = 0x1011,        // Invalid parameter
          NACK_FINGER_IS_NOT_PRESSED  = 0x1012,        // Finger is not pressed
          INVALID                     = 0XFFFF         // Used when parsing fails
       }Error, e;
 
 
    }ErrorCodes;
    
    //Response_Packet(unsigned char* buffer, bool UseSerialDebug);
    unsigned char RawBytes[12];
    unsigned char ParameterBytes[4];
    unsigned char ResponseBytes[2];
    bool ACK;
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;        // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;        // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
 
}Response_Packet;
 
unsigned char* Command_Packet_GetPacketBytes();                                                        // returns the bytes to be transmitted
void Command_Packet_ParameterFromInt(int i);
unsigned int Command_Packet_CalculateChecksum();                                                // Checksum is calculated using byte addition
unsigned char Command_Packet_GetHighByte(unsigned int w);
unsigned char Command_Packet_GetLowByte(unsigned int w);
 
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low);
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug);
 
int Response_Packet_IntFromParameter();
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug);
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length);
unsigned char Response_Packet_GetHighByte(unsigned int w);
unsigned char Response_Packet_GetLowByte(unsigned int w);
 
//Initialises the device and gets ready for commands
void FPS_GT511C3_Open();
 
// Does not actually do anything (according to the datasheet)
// I implemented open, so had to do closed too... lol
void FPS_GT511C3_Close();
 
// Turns on or off the LED backlight
// LED must be on to see fingerprints
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on);
 
// Changes the baud rate of the connection
// Parameter: 9600 - 115200
// Returns: True if success, false if invalid baud
// NOTE: Untested (don't have a logic level changer and a voltage divider is too slow)
bool FPS_GT511C3_ChangeBaudRate(int baud);
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount();
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id);
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id);
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1();
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2();
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3();
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger();
 
// Deletes the specified ID (enrollment) from the database
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int ID);
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll();
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id);
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N();
 
// Captures the currently pressed finger into onboard ram
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality);
 
//-= Not implemented commands =-
 
// Gets an image that is 258x202 (52116 bytes) and returns it in 407 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetImage();
 
// Gets an image that is qvga 160x120 (19200 bytes) and returns it in 150 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetRawImage();
 
// Gets a template from the fps (498 bytes) in 4 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Parameter: 0-199 ID number
// Returns:
//        0 - ACK Download starting
//        1 - Invalid position
//        2 - ID not used (no template to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int GetTemplate(int id);
 
// Uploads a template to the fps
// Parameter: the template (498 bytes)
// Parameter: the ID number to upload
// Parameter: Check for duplicate fingerprints already on fps
// Returns:
//        0-199 - ID duplicated
//        200 - Uploaded ok (no duplicate if enabled)
//        201 - Invalid position
//        202 - Communications error
//        203 - Device error
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int SetTemplate(byte* tmplt, int id, bool duplicateCheck);
 
// Commands that are not implemented (and why)
// VerifyTemplate1_1 - Couldn't find a good reason to implement this on an arduino
// IdentifyTemplate1_N - Couldn't find a good reason to implement this on an arduino
// MakeTemplate - Couldn't find a good reason to implement this on an arduino
// UsbInternalCheck - not implemented - Not valid config for arduino
// GetDatabaseStart - historical command, no longer supported
// GetDatabaseEnd - historical command, no longer supported
// UpgradeFirmware - Data Sheet says not supported
// UpgradeISOCDImage - Data Sheet says not supported
// SetIAPMode - for upgrading firmware (which is not supported)
// Ack and Nack        are listed as a commands for some unknown reason... not implemented
 
void FPS_GT511C3_serialPrintHex(unsigned char data_);
void FPS_GT511C3_SendToSerial(unsigned char data[], int length);
 
// resets the Data_Packet class, and gets ready to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//void StartDataDownload();
 
// Returns the next data packet
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//Data_Packet GetNextDataPacket();
 
void SendCommand(unsigned char cmd[], int length);
void GetResponse();
 
void ResetVars() {
    gfirstbyte = 0;
    gdone = FALSE;
    gIndex = 1;
}
 
unsigned char* Command_Packet_GetPacketBytes() {
    unsigned char packetbytes[12];
    unsigned int cmd, checksum;
    // update command before calculating checksum (important!)
    cmd = Command_packet.Commands.Command;
    Command_Packet.command[0] = Command_Packet_GetLowByte(cmd);
    Command_Packet.command[1] = Command_Packet_GetHighByte(cmd);
 
    checksum = Command_Packet_CalculateChecksum();
 
    packetbytes[0] = Command_Packet.COMMAND_START_CODE_1;
    packetbytes[1] = Command_Packet.COMMAND_START_CODE_2;
    packetbytes[2] = Command_Packet.COMMAND_DEVICE_ID_1;
    packetbytes[3] = Command_Packet.COMMAND_DEVICE_ID_2;
    packetbytes[4] = Command_Packet.Parameter[0];
    packetbytes[5] = Command_Packet.Parameter[1];
    packetbytes[6] = Command_Packet.Parameter[2];
    packetbytes[7] = Command_Packet.Parameter[3];
    packetbytes[8] = Command_Packet.command[0];
    packetbytes[9] = Command_Packet.command[1];
    packetbytes[10] = Command_Packet_GetLowByte(checksum);
    packetbytes[11] = Command_Packet_GetHighByte(checksum);
 
    return &packetbytes;
}
 
// Converts the int to bytes and puts them into the paramter array
void Command_Packet_ParameterFromInt(int i) {
    Command_Packet.Parameter[0] = (i & 0x000000ff);
    Command_Packet.Parameter[1] = (i & 0x0000ff00) >> 8;
    Command_Packet.Parameter[2] = (i & 0x00ff0000) >> 16;
    Command_Packet.Parameter[3] = (i & 0xff000000) >> 24;
}
 
// Returns the high byte from a word
unsigned char Command_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Command_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
unsigned int Command_Packet_CalculateChecksum() {
    unsigned int w = 0;
 
    w += Command_Packet.COMMAND_START_CODE_1;
    w += Command_Packet.COMMAND_START_CODE_2;
    w += Command_Packet.COMMAND_DEVICE_ID_1;
    w += Command_Packet.COMMAND_DEVICE_ID_2;
    w += Command_Packet.Parameter[0];
    w += Command_Packet.Parameter[1];
    w += Command_Packet.Parameter[2];
    w += Command_Packet.Parameter[3];
    w += Command_Packet.command[0];
    w += Command_Packet.command[1];
 
    return w;
}
 
// parses bytes into one of the possible errors from the finger print scanner
//Response_Packet::ErrorCodes::Errors_Enum Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low)
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low) {
    Response_Packet.ErrorCodes.e = INVALID;
 
    if (high == 0x00)
    {
    }
    // grw 01/03/15 - replaced if clause with else clause for any non-zero high byte
    // if (high == 0x01)
    // {
    else {
        switch(low) {
            case 0x00: Response_Packet.ErrorCodes.e = NO_ERROR; break;
            case 0x01: Response_Packet.ErrorCodes.e = NACK_TIMEOUT; break;
            case 0x02: Response_Packet.ErrorCodes.e = NACK_INVALID_BAUDRATE; break;
            case 0x03: Response_Packet.ErrorCodes.e = NACK_INVALID_POS; break;
            case 0x04: Response_Packet.ErrorCodes.e = NACK_IS_NOT_USED; break;
            case 0x05: Response_Packet.ErrorCodes.e = NACK_IS_ALREADY_USED; break;
            case 0x06: Response_Packet.ErrorCodes.e = NACK_COMM_ERR; break;
            case 0x07: Response_Packet.ErrorCodes.e = NACK_VERIFY_FAILED; break;
            case 0x08: Response_Packet.ErrorCodes.e = NACK_IDENTIFY_FAILED; break;
            case 0x09: Response_Packet.ErrorCodes.e = NACK_DB_IS_FULL; break;
            case 0x0A: Response_Packet.ErrorCodes.e = NACK_DB_IS_EMPTY; break;
            case 0x0B: Response_Packet.ErrorCodes.e = NACK_TURN_ERR; break;
            case 0x0C: Response_Packet.ErrorCodes.e = NACK_BAD_FINGER; break;
            case 0x0D: Response_Packet.ErrorCodes.e = NACK_ENROLL_FAILED; break;
            case 0x0E: Response_Packet.ErrorCodes.e = NACK_IS_NOT_SUPPORTED; break;
            case 0x0F: Response_Packet.ErrorCodes.e = NACK_DEV_ERR; break;
            case 0x10: Response_Packet.ErrorCodes.e = NACK_CAPTURE_CANCELED; break;
            case 0x11: Response_Packet.ErrorCodes.e = NACK_INVALID_PARAM; break;
            case 0x12: Response_Packet.ErrorCodes.e = NACK_FINGER_IS_NOT_PRESSED; break;
        };
    }
 
    return Response_Packet.ErrorCodes.e;
}
 
// checks to see if the byte is the proper value, and logs it to the serial channel if not
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug) {
    bool retval;
    char str[22];
 
    retval = (b != propervalue) && (b != alternatevalue);
 
    if((UseSerialDebug) && (retval)) {
        UART5_Write_Text("Response_Packet parsing error \r\n");
        UART5_Write_Text(varname);
        UART5_Write_Text(" ");
        ByteToHex(propervalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" || ");
        ByteToHex(alternatevalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" != ");
        ByteToHex(b, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
    }
}
 
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}
 
// Gets an int from the parameter bytes
int Response_Packet_IntFromParameter() {
    int retval = 0;
 
    retval = (retval << 8) + Response_Packet.ParameterBytes[3];
    retval = (retval << 8) + Response_Packet.ParameterBytes[2];
    retval = (retval << 8) + Response_Packet.ParameterBytes[1];
    retval = (retval << 8) + Response_Packet.ParameterBytes[0];
 
    return retval;
}
 
// calculates the checksum from the bytes in the Packet
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
    
    for(i = 0; i < length; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}
 
// Returns the high byte from a word
unsigned char Response_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Response_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
void FPS_GT511C3_SendCommand(unsigned char cmd[], int length) {
    unsigned int i = 0;
 
    for(i = 0; i < length; i++) {
         UART2_Write(cmd[i]);
    }
 
    if(UseSerialDebug) {
        UART5_Write_Text("FPS - SEND: ");
        for(i = 0; i < length; i++) {
           UART5_Write(cmd[i]);
        }
 
        UART5_Write_Text("\r\n");
    }
}
 
// sends a byte to the serial debugger in the hex format we want EX "0F"
void FPS_GT511C3_serialPrintHex(unsigned char data_) {
    char tmp[16];
    ByteToHex(tmp, data_);
    Ltrim(tmp);
    Rtrim(tmp);
    UART5_Write_Text(tmp);
}
 
// sends the bye aray to the serial debugger in our hex format EX: "00 AF FF 10 00 13"
void FPS_GT511C3_SendToSerial(unsigned char data_[], int length) {
    bool first = TRUE;
    unsigned int i;
 
    UART5_Write_Text(""");
 
    for(i = 0; i < length; i++) {
       if(first)first = FALSE;
       else UART5_Write_Text(" ");
       FPS_GT511C3_serialPrintHex(data_[i]);
    }
 
    UART5_Write_Text(""");
}
 
void PrintResponseBytes(unsigned char *response) {
     unsigned int i = 0;
 
     for(i = 0; i < 12; i++) {
          FPS_GT511C3_serialPrintHex(response[i]);
     }
}
 
// Gets the response to the command from the software serial channel (and waits for it)
void FPS_GT511C3_GetResponse() {
    /*
    unsigned char firstbyte = 0;
    bool done = FALSE;
    unsigned char resp[12];
    unsigned int i;
 
    while(done == FALSE) {
       firstbyte = (unsigned char)UART2_Read();
 
       if(firstbyte == Response_Packet.COMMAND_START_CODE_1) {
            done = TRUE;
       }
    }
 
    resp[0] = firstbyte;
 
    for(i = 1; i < 12; i++) {
          resp[i]= (unsigned char)UART2_Read();
    }
    */
    Delay_ms(2000);
    Response_Packet_Response_Packet(resp, UseSerialDebug);
 
    if(UseSerialDebug) {
         UART5_Write_Text("FPS - RECV: ");
         FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
         UART5_Write_Text("\r\n");
         UART5_Write_Text("\r\n");
    }
}
 
bool FPS_GT511C3_ChangeBaudRate(int baud) {
    unsigned char* Packetbytes;
    bool retval;
    
    if((baud == 9600) || (baud == 19200) || (baud == 38400) || (baud == 57600) || (baud == 115200)) {
        if(UseSerialDebug)UART5_Write_Text("FPS - ChangeBaudRate\r\n");
        Command_Packet.Commands.Command = Open;
        Command_Packet_ParameterFromInt(baud);
        Packetbytes = Command_Packet_GetPacketBytes();
        FPS_GT511C3_SendCommand(Packetbytes, 12);
        FPS_GT511C3_GetResponse();
        ResetVars();
        retval = Response_Packet.ACK;
        
        if(retval) {
            UART2_Init(baud);
            Delay_ms(200);
        }
 
        return retval;
    }
    
    return FALSE;
}
 
void FPS_GT511C3_Open() {
    unsigned char* Packetbytes;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Open\r\n");
    Command_Packet.Commands.Command = Open;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    PrintResponseBytes(resp);
    ResetVars();
}
 
// Turns on or off the LED backlight
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on) {
    unsigned char* Packetbytes;
    bool retval;
    
    Command_Packet.Commands.Command = CmosLed;
    
    if(on) {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED on\r\n");
       Command_Packet.Parameter[0] = 0x01;
    }
    else {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED off\r\n");
       Command_Packet.Parameter[0] = 0x00;
    }
    
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = TRUE;
    if(Response_Packet.ACK == FALSE)retval = FALSE;
    return retval;
}
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - GetEnrolledCount\r\n");
    Command_Packet.Commands.Command = GetEnrollCount;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
 
    retval = Response_Packet_IntFromParameter();
    return retval;
}
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id) {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - CheckEnrolled\r\n");
    Command_Packet.Commands.Command = CheckEnrolled;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    retval = Response_Packet.ACK;
    return retval;
}
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - EnrollStart\r\n");
    Command_Packet.Commands.Command = EnrollStart;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
         if(Response_Packet.ErrorCodes.Error == NACK_DB_IS_FULL)retval = 1;
         if(Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 2;
         if(Response_Packet.ErrorCodes.Error == NACK_IS_ALREADY_USED)retval = 3;
    }
 
    return retval;
}
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll1;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll2;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll3;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger() {
    unsigned char* Packetbytes;
    bool retval;
    int pval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - IsPressFinger\r\n");
    Command_Packet.Commands.Command = IsPressFinger;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    pval = Response_Packet.ParameterBytes[0];
    pval += Response_Packet.ParameterBytes[1];
    pval += Response_Packet.ParameterBytes[2];
    pval += Response_Packet.ParameterBytes[3];
    
    if(pval == 0)retval = TRUE;
 
    return retval;
}
 
// Deletes the specified ID (enrollment) from the database
// Parameter: 0-199 (id number to be deleted)
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int id) {
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteID\r\n");
    Command_Packet.Commands.Command = DeleteID;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll() {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteAll\r\n");
    Command_Packet.Commands.Command = DeleteAll;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Verify1_1\r\n");
    Command_Packet.Commands.Command = Verify1_1;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
    
 
    if(Response_Packet.ACK == FALSE)
    {
          retval = 3; // grw 01/03/15 - set default value of not verified before assignment
          
          if (Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 1;
          if (Response_Packet.ErrorCodes.Error == NACK_IS_NOT_USED) retval = 2;
          if (Response_Packet.ErrorCodes.Error == NACK_VERIFY_FAILED) retval = 3;
    }
 
 
    return retval;
}
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Identify1_N\r\n");
    Command_Packet.Commands.Command = Identify1_N;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval > 200) retval = 200;
 
    return retval;
}
 
// Captures the currently pressed finger into onboard ram use this prior to other commands
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality) {
 
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - CaptureFinger\r\n");
    Command_Packet.Commands.Command = CaptureFinger;
    if(highquality) {
        Command_Packet_ParameterFromInt(1);
    }
    else {
        Command_Packet_ParameterFromInt(0);
    }
    
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
void Enroll() {
     // Enroll test
 
    // find open enroll id
    int enrollid = 0;
    int bret, iret;
    bool usedid = TRUE;
    
    while(usedid == TRUE) {
        usedid = FPS_GT511C3_CheckEnrolled(enrollid);
        if (usedid == TRUE)enrollid++;
    }
    
    FPS_GT511C3_EnrollStart(enrollid);
 
    // enroll
    UART_Write_Text("Press finger to Enroll #");
    UART_Write_Text(enrollid);
    UART_Write_Text("\r\n");
    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
    bret = FPS_GT511C3_CaptureFinger(TRUE);
    iret = 0;
    
    if(bret != FALSE) {
            UART5_Write_Text("Remove finger\r\n");
            FPS_GT511C3_Enroll1();
            while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
            UART5_Write_Text("Press same finger again\r\n");
            while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
            bret = FPS_GT511C3_CaptureFinger(TRUE);
            
            if(bret != FALSE)
            {
                    UART5_Write_Text("Remove finger\r\n");
                    FPS_GT511C3_Enroll2();
                    while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
                    UART5_Write_Text("Press same finger yet again\r\n");
                    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
                    bret = FPS_GT511C3_CaptureFinger(TRUE);
                    if (bret != FALSE)
                    {
                            UART5_Write_Text("Remove finger\r\n");
                            iret = FPS_GT511C3_Enroll3();
                            if (iret == 0)
                            {
                                    UART5_Write_Text("Enrolling Successfull\r\n");
                            }
                            else
                            {
                                    UART5_Write_Text("Enrolling Failed with error code:");
                                    UART5_Write_Text(iret);
                                    UART5_Write_Text("\r\n");
                            }
                    }
                    else UART5_Write_Text("Failed to capture third finger\r\n");
            }
            else UART5_Write_Text("Failed to capture second finger\r\n");
    }
    else UART5_Write_Text("Failed to capture first finger\r\n");
}
 
void UART2() iv IVT_UART_2 ilevel 2 ics ICS_AUTO {
    
    if(gdone = TRUE) {
       resp[gIndex++]= UART2_Read();
    }
    else if(gdone == FALSE) {
       gfirstbyte = UART2_Read();
 
       if(gfirstbyte == Response_Packet.COMMAND_START_CODE_1) {
            resp[0] = gfirstbyte;
            gIndex = 1;
            gdone = TRUE;
       }
    }
    
    U2RXIF_bit = 0;
}
 
void main() {
 
    AD1PCFG = 0xFFFF;
    JTAGEN_bit = 0;
    
    TRISB = 0x00000000;
    
    
    Command_Packet.COMMAND_START_CODE_1 = 0x55;
    Command_Packet.COMMAND_START_CODE_2 = 0xAA;
    Command_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Command_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    Response_Packet.COMMAND_START_CODE_1 = 0x55;
    Response_Packet.COMMAND_START_CODE_2 = 0xAA;
    Response_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Response_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    UART5_Init(9600);
    Delay_ms(200);
    UART2_Init(9600);
    Delay_ms(200);
    
    U2IP0_bit = 0;                     // Set UART2 interrupt
    U2IP1_bit = 1;                     // Set interrupt priorities
    U2IP2_bit = 1;                     // Set UART2 interrupt to level 6
 
 
    U2RXIE_bit = 1;
    Delay_ms(200);
    U2RXIF_bit = 0;
    EnableInterrupts();       // Enable all interrupts
    
    UseSerialDebug = TRUE;
    
    UART5_Write_Text("UART5 Ready...");
    
    FPS_GT511C3_Open();
    Delay_ms(200);
 
    while(1) {
    
          Delay_ms(2000);
          //Enroll();
          FPS_GT511C3_SetLED(1);
          Delay_ms(2000);
          FPS_GT511C3_SetLED(0);
    }
}




Screenshot showing the debug. You can see that resp[] array elements are 1 byte shifted and doesn't match with the data in the below function.

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void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}


Also in the GetResponse() function it is not executing the below function.

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FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);


This is the piece of code inside GetResponse() function.

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if(UseSerialDebug) {
         UART5_Write_Text("FPS - RECV: ");
         FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
         UART5_Write_Text("\r\n");
         UART5_Write_Text("\r\n");
    }


You can see in the screenshot that it is printing "FPS - RECV: ". But after that it is not printing 12 rawbytes.

- - - Updated - - -

Here is the debug showing that it is working if I don't check for response. To do an enroll I have to get the response thing working.
 

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Last edited:

This is my latest code. See the screenshot of Termite Serial Terminal Software. It shows what is happening. I don't understand why the bytes in resp[] array are 1 element shifted. You can see at the end of each reception it prints the received bytes.

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#define bool unsigned char
#define uint8_t unsigned char
 
#define TRUE 1
#define FALSE 0
 
unsigned char resp[20];
unsigned char gfirstbyte = 0;
bool gdone = FALSE;
unsigned gIndex = 1;
 
bool UseSerialDebug;
 
//Command_Packet represents the 12 byte command that we send to the finger print scanner
 
struct Cmd_Packet {
    struct Cmds {
        enum Cmds_Enum {
              NotSet              = 0x00,                // Default value for enum. Scanner will return error if sent this.
              Open                = 0x01,                // Open Initialization
              Close               = 0x02,                // Close Termination
              UsbInternalCheck    = 0x03,                // UsbInternalCheck Check if the connected USB device is valid
              ChangeEBaudRate     = 0x04,                // ChangeBaudrate Change UART baud rate
              SetIAPMode          = 0x05,                // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
              CmosLed             = 0x12,                // CmosLed Control CMOS LED
              GetEnrollCount      = 0x20,                // Get enrolled fingerprint count
              CheckEnrolled       = 0x21,                // Check whether the specified ID is already enrolled
              EnrollStart         = 0x22,                // Start an enrollment
              Enroll1             = 0x23,                // Make 1st template for an enrollment
              Enroll2             = 0x24,                // Make 2nd template for an enrollment
              Enroll3             = 0x25,                // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
              IsPressFinger       = 0x26,                // Check if a finger is placed on the sensor
              DeleteID            = 0x40,                // Delete the fingerprint with the specified ID
              DeleteAll           = 0x41,                // Delete all fingerprints from the database
              Verify1_1           = 0x50,                // Verification of the capture fingerprint image with the specified ID
              Identify1_N         = 0x51,                // Identification of the capture fingerprint image with the database
              VerifyTemplate1_1   = 0x52,                // Verification of a fingerprint template with the specified ID
              IdentifyTemplate1_N = 0x53,                // Identification of a fingerprint template with the database
              CaptureFinger       = 0x60,                // Capture a fingerprint image(256x256) from the sensor
              MakeTemplate        = 0x61,                // Make template for transmission
              GetImage            = 0x62,                // Download the captured fingerprint image(256x256)
              GetRawImage         = 0x63,                // Capture & Download raw fingerprint image(320x240)
              GetTemplate         = 0x70,                // Download the template of the specified ID
              SetTemplate         = 0x71,                // Upload the template of the specified ID
              GetDatabaseStart    = 0x72,                // Start database download, obsolete
              GetDatabaseEnd      = 0x73,                // End database download, obsolete
              UpgradeFirmware     = 0x80,                // Not supported
              UpgradeISOCDImage   = 0x81,                // Not supported
              Ack                 = 0x30,                // Acknowledge.
              Nack                = 0x31                 // Non-acknowledge
         }Command;
    }Commands;
 
    unsigned char Parameter[4];                                                                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
    unsigned char command[2];                  // Command 2 bytes
}Command_packet;
 
struct Resp_Packet {
    struct ErrCodes {
       enum Errs_Enum {
          NO_ERROR                    = 0x0000,        // Default value. no error
          NACK_TIMEOUT                = 0x1001,        // Obsolete, capture timeout
          NACK_INVALID_BAUDRATE       = 0x1002,        // Obsolete, Invalid serial baud rate
          NACK_INVALID_POS            = 0x1003,        // The specified ID is not between 0~199
          NACK_IS_NOT_USED            = 0x1004,        // The specified ID is not used
          NACK_IS_ALREADY_USED        = 0x1005,        // The specified ID is already used
          NACK_COMM_ERR               = 0x1006,        // Communication Error
          NACK_VERIFY_FAILED          = 0x1007,        // 1:1 Verification Failure
          NACK_IDENTIFY_FAILED        = 0x1008,        // 1:N Identification Failure
          NACK_DB_IS_FULL             = 0x1009,        // The database is full
          NACK_DB_IS_EMPTY            = 0x100A,        // The database is empty
          NACK_TURN_ERR               = 0x100B,        // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
          NACK_BAD_FINGER             = 0x100C,        // Too bad fingerprint
          NACK_ENROLL_FAILED          = 0x100D,        // Enrollment Failure
          NACK_IS_NOT_SUPPORTED       = 0x100E,        // The specified command is not supported
          NACK_DEV_ERR                = 0x100F,        // Device Error, especially if Crypto-Chip is trouble
          NACK_CAPTURE_CANCELED       = 0x1010,        // Obsolete, The capturing is canceled
          NACK_INVALID_PARAM          = 0x1011,        // Invalid parameter
          NACK_FINGER_IS_NOT_PRESSED  = 0x1012,        // Finger is not pressed
          INVALID                     = 0XFFFF         // Used when parsing fails
       }Error, e;
 
 
    }ErrorCodes;
    
    //Response_Packet(unsigned char* buffer, bool UseSerialDebug);
    unsigned char RawBytes[12];
    unsigned char ParameterBytes[4];
    unsigned char ResponseBytes[2];
    bool ACK;
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;        // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;        // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
 
}Response_Packet;
 
unsigned char* Command_Packet_GetPacketBytes();                                                        // returns the bytes to be transmitted
void Command_Packet_ParameterFromInt(int i);
unsigned int Command_Packet_CalculateChecksum();                                                // Checksum is calculated using byte addition
unsigned char Command_Packet_GetHighByte(unsigned int w);
unsigned char Command_Packet_GetLowByte(unsigned int w);
 
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low);
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug);
 
int Response_Packet_IntFromParameter();
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug);
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length);
unsigned char Response_Packet_GetHighByte(unsigned int w);
unsigned char Response_Packet_GetLowByte(unsigned int w);
 
//Initialises the device and gets ready for commands
void FPS_GT511C3_Open();
 
// Does not actually do anything (according to the datasheet)
// I implemented open, so had to do closed too... lol
void FPS_GT511C3_Close();
 
// Turns on or off the LED backlight
// LED must be on to see fingerprints
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on);
 
// Changes the baud rate of the connection
// Parameter: 9600 - 115200
// Returns: True if success, false if invalid baud
// NOTE: Untested (don't have a logic level changer and a voltage divider is too slow)
bool FPS_GT511C3_ChangeBaudRate(int baud);
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount();
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id);
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id);
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1();
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2();
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3();
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger();
 
// Deletes the specified ID (enrollment) from the database
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int ID);
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll();
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id);
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N();
 
// Captures the currently pressed finger into onboard ram
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality);
 
//-= Not implemented commands =-
 
// Gets an image that is 258x202 (52116 bytes) and returns it in 407 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetImage();
 
// Gets an image that is qvga 160x120 (19200 bytes) and returns it in 150 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetRawImage();
 
// Gets a template from the fps (498 bytes) in 4 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Parameter: 0-199 ID number
// Returns:
//        0 - ACK Download starting
//        1 - Invalid position
//        2 - ID not used (no template to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int GetTemplate(int id);
 
// Uploads a template to the fps
// Parameter: the template (498 bytes)
// Parameter: the ID number to upload
// Parameter: Check for duplicate fingerprints already on fps
// Returns:
//        0-199 - ID duplicated
//        200 - Uploaded ok (no duplicate if enabled)
//        201 - Invalid position
//        202 - Communications error
//        203 - Device error
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int SetTemplate(byte* tmplt, int id, bool duplicateCheck);
 
// Commands that are not implemented (and why)
// VerifyTemplate1_1 - Couldn't find a good reason to implement this on an arduino
// IdentifyTemplate1_N - Couldn't find a good reason to implement this on an arduino
// MakeTemplate - Couldn't find a good reason to implement this on an arduino
// UsbInternalCheck - not implemented - Not valid config for arduino
// GetDatabaseStart - historical command, no longer supported
// GetDatabaseEnd - historical command, no longer supported
// UpgradeFirmware - Data Sheet says not supported
// UpgradeISOCDImage - Data Sheet says not supported
// SetIAPMode - for upgrading firmware (which is not supported)
// Ack and Nack        are listed as a commands for some unknown reason... not implemented
 
void FPS_GT511C3_serialPrintHex(unsigned char data_);
void FPS_GT511C3_SendToSerial(unsigned char data[], int length);
 
// resets the Data_Packet class, and gets ready to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//void StartDataDownload();
 
// Returns the next data packet
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//Data_Packet GetNextDataPacket();
 
void SendCommand(unsigned char cmd[], int length);
void GetResponse();
 
void ResetVars() {
    gfirstbyte = 0;
    gdone = FALSE;
    gIndex = 1;
}
 
unsigned char* Command_Packet_GetPacketBytes() {
    unsigned char packetbytes[12];
    unsigned int cmd, checksum;
    // update command before calculating checksum (important!)
    cmd = Command_packet.Commands.Command;
    Command_Packet.command[0] = Command_Packet_GetLowByte(cmd);
    Command_Packet.command[1] = Command_Packet_GetHighByte(cmd);
 
    checksum = Command_Packet_CalculateChecksum();
 
    packetbytes[0] = Command_Packet.COMMAND_START_CODE_1;
    packetbytes[1] = Command_Packet.COMMAND_START_CODE_2;
    packetbytes[2] = Command_Packet.COMMAND_DEVICE_ID_1;
    packetbytes[3] = Command_Packet.COMMAND_DEVICE_ID_2;
    packetbytes[4] = Command_Packet.Parameter[0];
    packetbytes[5] = Command_Packet.Parameter[1];
    packetbytes[6] = Command_Packet.Parameter[2];
    packetbytes[7] = Command_Packet.Parameter[3];
    packetbytes[8] = Command_Packet.command[0];
    packetbytes[9] = Command_Packet.command[1];
    packetbytes[10] = Command_Packet_GetLowByte(checksum);
    packetbytes[11] = Command_Packet_GetHighByte(checksum);
 
    return &packetbytes;
}
 
// Converts the int to bytes and puts them into the paramter array
void Command_Packet_ParameterFromInt(int i) {
    Command_Packet.Parameter[0] = (i & 0x000000ff);
    Command_Packet.Parameter[1] = (i & 0x0000ff00) >> 8;
    Command_Packet.Parameter[2] = (i & 0x00ff0000) >> 16;
    Command_Packet.Parameter[3] = (i & 0xff000000) >> 24;
}
 
// Returns the high byte from a word
unsigned char Command_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Command_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
unsigned int Command_Packet_CalculateChecksum() {
    unsigned int w = 0;
 
    w += Command_Packet.COMMAND_START_CODE_1;
    w += Command_Packet.COMMAND_START_CODE_2;
    w += Command_Packet.COMMAND_DEVICE_ID_1;
    w += Command_Packet.COMMAND_DEVICE_ID_2;
    w += Command_Packet.Parameter[0];
    w += Command_Packet.Parameter[1];
    w += Command_Packet.Parameter[2];
    w += Command_Packet.Parameter[3];
    w += Command_Packet.command[0];
    w += Command_Packet.command[1];
 
    return w;
}
 
// Gets an int from the parameter bytes
int Response_Packet_IntFromParameter() {
    int retval = 0;
 
    retval = (retval << 8) + Response_Packet.ParameterBytes[3];
    retval = (retval << 8) + Response_Packet.ParameterBytes[2];
    retval = (retval << 8) + Response_Packet.ParameterBytes[1];
    retval = (retval << 8) + Response_Packet.ParameterBytes[0];
 
    return retval;
}
 
// calculates the checksum from the bytes in the Packet
//unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
 
    for(i = 0; i < length; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}
 
// Returns the high byte from a word
unsigned char Response_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Response_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
// parses bytes into one of the possible errors from the finger print scanner
//Response_Packet::ErrorCodes::Errors_Enum Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low)
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low) {
    Response_Packet.ErrorCodes.e = INVALID;
 
    if (high == 0x00)
    {
    }
    // grw 01/03/15 - replaced if clause with else clause for any non-zero high byte
    // if (high == 0x01)
    // {
    else {
        switch(low) {
            case 0x00: Response_Packet.ErrorCodes.e = NO_ERROR; break;
            case 0x01: Response_Packet.ErrorCodes.e = NACK_TIMEOUT; break;
            case 0x02: Response_Packet.ErrorCodes.e = NACK_INVALID_BAUDRATE; break;
            case 0x03: Response_Packet.ErrorCodes.e = NACK_INVALID_POS; break;
            case 0x04: Response_Packet.ErrorCodes.e = NACK_IS_NOT_USED; break;
            case 0x05: Response_Packet.ErrorCodes.e = NACK_IS_ALREADY_USED; break;
            case 0x06: Response_Packet.ErrorCodes.e = NACK_COMM_ERR; break;
            case 0x07: Response_Packet.ErrorCodes.e = NACK_VERIFY_FAILED; break;
            case 0x08: Response_Packet.ErrorCodes.e = NACK_IDENTIFY_FAILED; break;
            case 0x09: Response_Packet.ErrorCodes.e = NACK_DB_IS_FULL; break;
            case 0x0A: Response_Packet.ErrorCodes.e = NACK_DB_IS_EMPTY; break;
            case 0x0B: Response_Packet.ErrorCodes.e = NACK_TURN_ERR; break;
            case 0x0C: Response_Packet.ErrorCodes.e = NACK_BAD_FINGER; break;
            case 0x0D: Response_Packet.ErrorCodes.e = NACK_ENROLL_FAILED; break;
            case 0x0E: Response_Packet.ErrorCodes.e = NACK_IS_NOT_SUPPORTED; break;
            case 0x0F: Response_Packet.ErrorCodes.e = NACK_DEV_ERR; break;
            case 0x10: Response_Packet.ErrorCodes.e = NACK_CAPTURE_CANCELED; break;
            case 0x11: Response_Packet.ErrorCodes.e = NACK_INVALID_PARAM; break;
            case 0x12: Response_Packet.ErrorCodes.e = NACK_FINGER_IS_NOT_PRESSED; break;
        };
    }
 
    return Response_Packet.ErrorCodes.e;
}
 
// checks to see if the byte is the proper value, and logs it to the serial channel if not
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug) {
    bool retval;
    char str[22];
 
    retval = (b != propervalue) && (b != alternatevalue);
 
    if((UseSerialDebug) && (retval)) {
        UART5_Write_Text("Response_Packet parsing error \r\n");
        UART5_Write_Text(varname);
        UART5_Write_Text(" ");
        ByteToHex(propervalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" || ");
        ByteToHex(alternatevalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" != ");
        ByteToHex(b, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
    }
    
    return retval;
}
 
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[9], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[10], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[11], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[12], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}
 
/*
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}
*/
 
void FPS_GT511C3_SendCommand(unsigned char cmd[], int length) {
    unsigned int i = 0;
 
    for(i = 0; i < length; i++) {
         UART2_Write(cmd[i]);
    }
 
    if(UseSerialDebug) {
        UART5_Write_Text("FPS - SEND: ");
        for(i = 0; i < length; i++) {
           UART5_Write(cmd[i]);
        }
 
        UART5_Write_Text("\r\n\r\n");
    }
}
 
void PrintResponseBytes(unsigned char response[]) {
     unsigned int i = 0;
 
     for(i = 0; i < 12; i++) {
          FPS_GT511C3_serialPrintHex(response[i]);
     }
}
 
// sends a byte to the serial debugger in the hex format we want EX "0F"
void FPS_GT511C3_serialPrintHex(unsigned char data_) {
    char tmp[22];
    ByteToHex(data_, tmp);
    Ltrim(tmp);
    Rtrim(tmp);
    UART5_Write_Text(tmp);
}
 
// sends the bye aray to the serial debugger in our hex format EX: "00 AF FF 10 00 13"
void FPS_GT511C3_SendToSerial(unsigned char data_[], int length) {
    bool first = TRUE;
    unsigned int i;
 
    UART5_Write_Text(""");
 
    for(i = 0; i < length; i++) {
       if(first)first = FALSE;
       else UART5_Write_Text(" ");
       FPS_GT511C3_serialPrintHex(data_[i]);
    }
 
    UART5_Write_Text(""");
}
 
// Gets the response to the command from the software serial channel (and waits for it)
void FPS_GT511C3_GetResponse() {
    /*
    unsigned char firstbyte = 0;
    bool done = FALSE;
    unsigned char resp[12];
    unsigned int i;
 
    while(done == FALSE) {
       firstbyte = (unsigned char)UART2_Read();
 
       if(firstbyte == Response_Packet.COMMAND_START_CODE_1) {
            done = TRUE;
       }
    }
 
    resp[0] = firstbyte;
 
    for(i = 1; i < 12; i++) {
          resp[i]= (unsigned char)UART2_Read();
    }
    */
    Delay_ms(2000);
    Response_Packet_Response_Packet(resp, UseSerialDebug);
 
    if(UseSerialDebug) {
         UART5_Write_Text("FPS - RECV: ");
         FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
         UART5_Write_Text("\r\n");
         UART5_Write_Text("\r\n");
    }
}
 
bool FPS_GT511C3_ChangeBaudRate(int baud) {
    unsigned char* Packetbytes;
    bool retval;
    
    if((baud == 9600) || (baud == 19200) || (baud == 38400) || (baud == 57600) || (baud == 115200)) {
        if(UseSerialDebug)UART5_Write_Text("FPS - ChangeBaudRate\r\n");
        Command_Packet.Commands.Command = Open;
        Command_Packet_ParameterFromInt(baud);
        Packetbytes = Command_Packet_GetPacketBytes();
        FPS_GT511C3_SendCommand(Packetbytes, 12);
        FPS_GT511C3_GetResponse();
        ResetVars();
        retval = Response_Packet.ACK;
        
        if(retval) {
            UART2_Init(baud);
            Delay_ms(200);
        }
 
        return retval;
    }
    
    return FALSE;
}
 
void FPS_GT511C3_Open() {
    unsigned char* Packetbytes;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Open\r\n");
    Command_Packet.Commands.Command = Open;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    //PrintResponseBytes(resp);
    ResetVars();
}
 
// Turns on or off the LED backlight
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on) {
    unsigned char* Packetbytes;
    bool retval;
    
    Command_Packet.Commands.Command = CmosLed;
    
    if(on) {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED on\r\n");
       Command_Packet.Parameter[0] = 0x01;
    }
    else {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED off\r\n");
       Command_Packet.Parameter[0] = 0x00;
    }
    
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = TRUE;
    if(Response_Packet.ACK == FALSE)retval = FALSE;
    return retval;
}
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
int FPS_GT511C3_GetEnrollCount() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - GetEnrolledCount\r\n");
    Command_Packet.Commands.Command = GetEnrollCount;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
 
    retval = Response_Packet_IntFromParameter();
    return retval;
}
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(int id) {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - CheckEnrolled\r\n");
    Command_Packet.Commands.Command = CheckEnrolled;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    retval = Response_Packet.ACK;
    
    return retval;
}
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
int FPS_GT511C3_EnrollStart(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - EnrollStart\r\n");
    Command_Packet.Commands.Command = EnrollStart;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
         if(Response_Packet.ErrorCodes.Error == NACK_DB_IS_FULL)retval = 1;
         if(Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 2;
         if(Response_Packet.ErrorCodes.Error == NACK_IS_ALREADY_USED)retval = 3;
    }
 
    return retval;
}
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll1() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll1;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll2() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll2;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
int FPS_GT511C3_Enroll3() {
    unsigned char* Packetbytes;
    int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll3;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger() {
    unsigned char* Packetbytes;
    bool retval;
    int pval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - IsPressFinger\r\n");
    Command_Packet.Commands.Command = IsPressFinger;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    pval = Response_Packet.ParameterBytes[0];
    pval += Response_Packet.ParameterBytes[1];
    pval += Response_Packet.ParameterBytes[2];
    pval += Response_Packet.ParameterBytes[3];
    
    if(pval == 0)retval = TRUE;
 
    return retval;
}
 
// Deletes the specified ID (enrollment) from the database
// Parameter: 0-199 (id number to be deleted)
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int id) {
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteID\r\n");
    Command_Packet.Commands.Command = DeleteID;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll() {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteAll\r\n");
    Command_Packet.Commands.Command = DeleteAll;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
int FPS_GT511C3_Verify1_1(int id) {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Verify1_1\r\n");
    Command_Packet.Commands.Command = Verify1_1;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
    
 
    if(Response_Packet.ACK == FALSE)
    {
          retval = 3; // grw 01/03/15 - set default value of not verified before assignment
          
          if (Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 1;
          if (Response_Packet.ErrorCodes.Error == NACK_IS_NOT_USED) retval = 2;
          if (Response_Packet.ErrorCodes.Error == NACK_VERIFY_FAILED) retval = 3;
    }
 
 
    return retval;
}
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
int FPS_GT511C3_Identify1_N() {
    unsigned char* Packetbytes;
    int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Identify1_N\r\n");
    Command_Packet.Commands.Command = Identify1_N;
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval > 200) retval = 200;
 
    return retval;
}
 
// Captures the currently pressed finger into onboard ram use this prior to other commands
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality) {
 
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - CaptureFinger\r\n");
    Command_Packet.Commands.Command = CaptureFinger;
    if(highquality) {
        Command_Packet_ParameterFromInt(1);
    }
    else {
        Command_Packet_ParameterFromInt(0);
    }
    
    Packetbytes = Command_Packet_GetPacketBytes();
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
void Enroll() {
     // Enroll test
 
    // find open enroll id
    static int enrollid = 0;
    int bret, iret;
    bool usedid = TRUE;
    
    while(usedid == TRUE) {
        usedid = FPS_GT511C3_CheckEnrolled(enrollid);
        if(usedid == TRUE)enrollid++;
    }
    
    FPS_GT511C3_EnrollStart(enrollid);
 
    // enroll
    UART5_Write_Text("Press finger to Enroll #");
    UART5_Write_Text(enrollid);
    UART5_Write_Text("\r\n");
    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
    bret = FPS_GT511C3_CaptureFinger(TRUE);
    iret = 0;
    
    if(bret != FALSE) {
            UART5_Write_Text("Remove finger\r\n");
            FPS_GT511C3_Enroll1();
            while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
            UART5_Write_Text("Press same finger again\r\n");
            while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
            bret = FPS_GT511C3_CaptureFinger(TRUE);
            
            if(bret != FALSE)
            {
                    UART5_Write_Text("Remove finger\r\n");
                    FPS_GT511C3_Enroll2();
                    while(FPS_GT511C3_IsPressFinger() == TRUE)Delay_ms(100);
                    UART5_Write_Text("Press same finger yet again\r\n");
                    while(FPS_GT511C3_IsPressFinger() == FALSE)Delay_ms(100);
                    bret = FPS_GT511C3_CaptureFinger(TRUE);
                    if (bret != FALSE)
                    {
                            UART5_Write_Text("Remove finger\r\n");
                            iret = FPS_GT511C3_Enroll3();
                            if (iret == 0)
                            {
                                    UART5_Write_Text("Enrolling Successfull\r\n");
                            }
                            else
                            {
                                    UART5_Write_Text("Enrolling Failed with error code:");
                                    UART5_Write_Text(iret);
                                    UART5_Write_Text("\r\n");
                            }
                    }
                    else UART5_Write_Text("Failed to capture third finger\r\n");
            }
            else UART5_Write_Text("Failed to capture second finger\r\n");
    }
    else UART5_Write_Text("Failed to capture first finger\r\n");
}
 
void UART2() iv IVT_UART_2 ilevel 2 ics ICS_AUTO {
    
    if(gdone = TRUE) {
       resp[gIndex]= UART2_Read();
       //UART5_Write(resp[gIndex]);
       gIndex++;
    }
    else if(gdone == FALSE) {
       gfirstbyte = UART2_Read();
       //UART5_Write(gfirstbyte);
 
       if(gfirstbyte == Response_Packet.COMMAND_START_CODE_1) {
            resp[0] = gfirstbyte;
            gIndex = 1;
            gdone = TRUE;
       }
    }
    
    U2RXIF_bit = 0;
}
 
void main() {
 
    AD1PCFG = 0xFFFF;
    JTAGEN_bit = 0;
    
    TRISB = 0x00000000;
 
    Command_Packet.COMMAND_START_CODE_1 = 0x55;
    Command_Packet.COMMAND_START_CODE_2 = 0xAA;
    Command_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Command_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    Response_Packet.COMMAND_START_CODE_1 = 0x55;
    Response_Packet.COMMAND_START_CODE_2 = 0xAA;
    Response_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Response_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    UART5_Init(9600);
    Delay_ms(200);
    UART2_Init(9600);
    Delay_ms(200);
    
    U2IP0_bit = 0;                     // Set UART2 interrupt
    U2IP1_bit = 1;                     // Set interrupt priorities
    U2IP2_bit = 1;                     // Set UART2 interrupt to level 6
 
    U2RXIE_bit = 1;
    U2RXIF_bit = 0;
    EnableInterrupts();       // Enable all interrupts
    
    UseSerialDebug = TRUE;
    
    FPS_GT511C3_Open();
    Delay_ms(500);
    FPS_GT511C3_SetLED(1);
    Delay_ms(500);
    
    while(1) {
    
          //Delay_ms(2000);
          Enroll();
          //FPS_GT511C3_SetLED(1);
          //Delay_ms(2000);
          //FPS_GT511C3_SetLED(0);
    }
}



The RawBytes[] contains the response received from FPS.

Code C - [expand]
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for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }



In the second screenshot you can see that the received response bytes (resp[] or RawBytes[]) are printed after "FPS RECV: "


Edit: This is the modified function. Now I don't see the Response Packet Parsing Error messages and it is passing all functions. You can see it in the third screenshot.

I don't know why the unmodified (C++) code works in Arduino but same code implemented in C doesn't work. But if the changes shown below are made then it works.


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void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[4], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[9], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[10], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[11], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[12], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}



The original piece of code

Code C - [expand]
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Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);


The modified piece of code.

Code C - [expand]
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Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[4], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);



This is another modified function. I have made changes to print sent bytes.

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;
    unsigned int cmd, checksum;
    // update command before calculating checksum (important!)
    cmd = Command_packet.Commands.Command;
    Command_Packet.command[0] = Command_Packet_GetLowByte(cmd);
    Command_Packet.command[1] = Command_Packet_GetHighByte(cmd);
 
    checksum = Command_Packet_CalculateChecksum();
 
    packetbytes[0] = Command_Packet.COMMAND_START_CODE_1;
    packetbytes[1] = Command_Packet.COMMAND_START_CODE_2;
    packetbytes[2] = Command_Packet.COMMAND_DEVICE_ID_1;
    packetbytes[3] = Command_Packet.COMMAND_DEVICE_ID_2;
    packetbytes[4] = Command_Packet.Parameter[0];
    packetbytes[5] = Command_Packet.Parameter[1];
    packetbytes[6] = Command_Packet.Parameter[2];
    packetbytes[7] = Command_Packet.Parameter[3];
    packetbytes[8] = Command_Packet.command[0];
    packetbytes[9] = Command_Packet.command[1];
    packetbytes[10] = Command_Packet_GetLowByte(checksum);
    packetbytes[11] = Command_Packet_GetHighByte(checksum);
    
    if(UseSerialDebug) {
         UART5_Write_Text("\r\n\r\n");
         UART5_Write_Text("FPS - SENT BYTES: ");
         FPS_GT511C3_SendToSerial(Response_Packet.RawBytes, 12);
         UART5_Write_Text("\r\n\r\n");
    }
 
    return &packetbytes;
}


In the screenshot you can see that the "SENT BYTES: " are the same as "FPS RECV: " bytes.

- - - Updated - - -
 

Attachments

  • FPS Test 2.png
    FPS Test 2.png
    35.5 KB · Views: 119
  • FPS Test 3.png
    FPS Test 3.png
    31.9 KB · Views: 141
  • FPS Test 4.png
    FPS Test 4.png
    13.1 KB · Views: 144
  • FPS Test 5.png
    FPS Test 5.png
    16.9 KB · Views: 130
Last edited:

The Arduino Code works fine without modification and without problems.

Now let me come to the C Code issue.

You can see the screenshots showing the working in Arduino and 2nd screenshot showing that there is a difference in sent butes for IsFingerPresent command (C Code) compared to Arduino Code.

The same Command_Packet_GetPackeytBytes() function is used for all the commands. So, there can't be any bug in that function.

See the attached PDFs. It shows Serial Terminal Output for Arduino Code and mikroC PRO PIC32 Code.

Also check the youtube video. It shows C Code toggling Sensor's Cmos LED.

In mikroC PRO PIC32 Code

Code: 
FPS_GT511C3_IsPressFinger

returned true 5 times and also

Code: 
FPS_GT511C3_CaptureFinger

executed 5 times but returned flase.


And here is the complete latest mikroC PRO PIC32 Code.

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#define bool unsigned char
#define uint8_t unsigned char
 
#define TRUE 1
#define FALSE 0
 
unsigned char resp[20];
unsigned char gfirstbyte = 0;
bool gdone = FALSE;
unsigned int gIndex = 1, gCounter = 0;
 
bool UseSerialDebug;
 
//Command_Packet represents the 12 byte command that we send to the finger print scanner
 
struct Cmd_Packet {
    struct Cmds {
        enum Cmds_Enum {
              NotSet              = 0x00,                // Default value for enum. Scanner will return error if sent this.
              Open                = 0x01,                // Open Initialization
              Close               = 0x02,                // Close Termination
              UsbInternalCheck    = 0x03,                // UsbInternalCheck Check if the connected USB device is valid
              ChangeEBaudRate     = 0x04,                // ChangeBaudrate Change UART baud rate
              SetIAPMode          = 0x05,                // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
              CmosLed             = 0x12,                // CmosLed Control CMOS LED
              GetEnrollCount      = 0x20,                // Get enrolled fingerprint count
              CheckEnrolled       = 0x21,                // Check whether the specified ID is already enrolled
              EnrollStart         = 0x22,                // Start an enrollment
              Enroll1             = 0x23,                // Make 1st template for an enrollment
              Enroll2             = 0x24,                // Make 2nd template for an enrollment
              Enroll3             = 0x25,                // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
              IsPressFinger       = 0x26,                // Check if a finger is placed on the sensor
              DeleteID            = 0x40,                // Delete the fingerprint with the specified ID
              DeleteAll           = 0x41,                // Delete all fingerprints from the database
              Verify1_1           = 0x50,                // Verification of the capture fingerprint image with the specified ID
              Identify1_N         = 0x51,                // Identification of the capture fingerprint image with the database
              VerifyTemplate1_1   = 0x52,                // Verification of a fingerprint template with the specified ID
              IdentifyTemplate1_N = 0x53,                // Identification of a fingerprint template with the database
              CaptureFinger       = 0x60,                // Capture a fingerprint image(256x256) from the sensor
              MakeTemplate        = 0x61,                // Make template for transmission
              GetImage            = 0x62,                // Download the captured fingerprint image(256x256)
              GetRawImage         = 0x63,                // Capture & Download raw fingerprint image(320x240)
              GetTemplate         = 0x70,                // Download the template of the specified ID
              SetTemplate         = 0x71,                // Upload the template of the specified ID
              GetDatabaseStart    = 0x72,                // Start database download, obsolete
              GetDatabaseEnd      = 0x73,                // End database download, obsolete
              UpgradeFirmware     = 0x80,                // Not supported
              UpgradeISOCDImage   = 0x81,                // Not supported
              Ack                 = 0x30,                // Acknowledge.
              Nack                = 0x31                 // Non-acknowledge
         }Command;
    }Commands;
 
    unsigned char Parameter[4];                                                                // Parameter 4 bytes, changes meaning depending on command
 
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;         // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;         // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
    unsigned char command[2];                  // Command 2 bytes
}Command_packet;
 
struct Resp_Packet {
    struct ErrCodes {
       enum Errs_Enum {
          NO_ERROR                    = 0x0000,        // Default value. no error
          NACK_TIMEOUT                = 0x1001,        // Obsolete, capture timeout
          NACK_INVALID_BAUDRATE       = 0x1002,        // Obsolete, Invalid serial baud rate
          NACK_INVALID_POS            = 0x1003,        // The specified ID is not between 0~199
          NACK_IS_NOT_USED            = 0x1004,        // The specified ID is not used
          NACK_IS_ALREADY_USED        = 0x1005,        // The specified ID is already used
          NACK_COMM_ERR               = 0x1006,        // Communication Error
          NACK_VERIFY_FAILED          = 0x1007,        // 1:1 Verification Failure
          NACK_IDENTIFY_FAILED        = 0x1008,        // 1:N Identification Failure
          NACK_DB_IS_FULL             = 0x1009,        // The database is full
          NACK_DB_IS_EMPTY            = 0x100A,        // The database is empty
          NACK_TURN_ERR               = 0x100B,        // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
          NACK_BAD_FINGER             = 0x100C,        // Too bad fingerprint
          NACK_ENROLL_FAILED          = 0x100D,        // Enrollment Failure
          NACK_IS_NOT_SUPPORTED       = 0x100E,        // The specified command is not supported
          NACK_DEV_ERR                = 0x100F,        // Device Error, especially if Crypto-Chip is trouble
          NACK_CAPTURE_CANCELED       = 0x1010,        // Obsolete, The capturing is canceled
          NACK_INVALID_PARAM          = 0x1011,        // Invalid parameter
          NACK_FINGER_IS_NOT_PRESSED  = 0x1012,        // Finger is not pressed
          INVALID                     = 0XFFFF         // Used when parsing fails
       }Error, e;
 
 
    }ErrorCodes;
    
    //Response_Packet(unsigned char* buffer, bool UseSerialDebug);
    unsigned char RawBytes[13];
    unsigned char ParameterBytes[4];
    unsigned char ResponseBytes[2];
    bool ACK;
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;        // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;        // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
 
}Response_Packet;
 
unsigned char* Command_Packet_GetPacketBytes();                                                        // returns the bytes to be transmitted
void Command_Packet_ParameterFromInt(unsigned int i);
unsigned int Command_Packet_CalculateChecksum();                                                // Checksum is calculated using byte addition
unsigned char Command_Packet_GetHighByte(unsigned int w);
unsigned char Command_Packet_GetLowByte(unsigned int w);
 
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low);
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug);
 
int Response_Packet_IntFromParameter();
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug);
unsigned int Response_Packet_CalculateChecksum(unsigned char* buffer, int length);
unsigned char Response_Packet_GetHighByte(unsigned int w);
unsigned char Response_Packet_GetLowByte(unsigned int w);
 
//Initialises the device and gets ready for commands
void FPS_GT511C3_Open();
 
// Does not actually do anything (according to the datasheet)
// I implemented open, so had to do closed too... lol
void FPS_GT511C3_Close();
 
// Turns on or off the LED backlight
// LED must be on to see fingerprints
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on);
 
// Changes the baud rate of the connection
// Parameter: 9600 - 115200
// Returns: True if success, false if invalid baud
// NOTE: Untested (don't have a logic level changer and a voltage divider is too slow)
bool FPS_GT511C3_ChangeBaudRate(unsigned int baud);
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
unsigned int FPS_GT511C3_GetEnrollCount();
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(unsigned int id);
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
unsigned int FPS_GT511C3_EnrollStart(unsigned int id);
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll1();
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll2();
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll3();
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger();
 
// Deletes the specified ID (enrollment) from the database
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(unsigned int ID);
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll();
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
unsigned int FPS_GT511C3_Verify1_1(unsigned int id);
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
unsigned int FPS_GT511C3_Identify1_N();
 
// Captures the currently pressed finger into onboard ram
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality);
 
//-= Not implemented commands =-
 
// Gets an image that is 258x202 (52116 bytes) and returns it in 407 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetImage();
 
// Gets an image that is qvga 160x120 (19200 bytes) and returns it in 150 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Returns: True (device confirming download starting)
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//bool GetRawImage();
 
// Gets a template from the fps (498 bytes) in 4 Data_Packets
// Use StartDataDownload, and then GetNextDataPacket until done
// Parameter: 0-199 ID number
// Returns:
//        0 - ACK Download starting
//        1 - Invalid position
//        2 - ID not used (no template to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int GetTemplate(int id);
 
// Uploads a template to the fps
// Parameter: the template (498 bytes)
// Parameter: the ID number to upload
// Parameter: Check for duplicate fingerprints already on fps
// Returns:
//        0-199 - ID duplicated
//        200 - Uploaded ok (no duplicate if enabled)
//        201 - Invalid position
//        202 - Communications error
//        203 - Device error
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//int SetTemplate(byte* tmplt, int id, bool duplicateCheck);
 
// Commands that are not implemented (and why)
// VerifyTemplate1_1 - Couldn't find a good reason to implement this on an arduino
// IdentifyTemplate1_N - Couldn't find a good reason to implement this on an arduino
// MakeTemplate - Couldn't find a good reason to implement this on an arduino
// UsbInternalCheck - not implemented - Not valid config for arduino
// GetDatabaseStart - historical command, no longer supported
// GetDatabaseEnd - historical command, no longer supported
// UpgradeFirmware - Data Sheet says not supported
// UpgradeISOCDImage - Data Sheet says not supported
// SetIAPMode - for upgrading firmware (which is not supported)
// Ack and Nack        are listed as a commands for some unknown reason... not implemented
 
void FPS_GT511C3_serialPrintHex(unsigned char data_);
void FPS_GT511C3_SendToSerial(unsigned char data[], int length);
 
// resets the Data_Packet class, and gets ready to download
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//void StartDataDownload();
 
// Returns the next data packet
// Not implemented due to memory restrictions on the arduino
// may revisit this if I find a need for it
//Data_Packet GetNextDataPacket();
 
void SendCommand(unsigned char cmd[], int length);
void GetResponse();
 
void ResetVars() {
    gfirstbyte = 0;
    gdone = FALSE;
    gIndex = 1;
}
 
unsigned char* Command_Packet_GetPacketBytes() {
    unsigned char Packetbytes[12];
    unsigned int cmd, checksum;
    // update command before calculating checksum (important!)
    cmd = Command_packet.Commands.Command;
    Command_Packet.command[0] = Command_Packet_GetLowByte(cmd);
    Command_Packet.command[1] = Command_Packet_GetHighByte(cmd);
 
    checksum = Command_Packet_CalculateChecksum();
 
    Packetbytes[0] = Command_Packet.COMMAND_START_CODE_1;
    packetbytes[1] = Command_Packet.COMMAND_START_CODE_2;
    packetbytes[2] = Command_Packet.COMMAND_DEVICE_ID_1;
    packetbytes[3] = Command_Packet.COMMAND_DEVICE_ID_2;
    packetbytes[4] = Command_Packet.Parameter[0];
    packetbytes[5] = Command_Packet.Parameter[1];
    packetbytes[6] = Command_Packet.Parameter[2];
    packetbytes[7] = Command_Packet.Parameter[3];
    packetbytes[8] = Command_Packet.command[0];
    packetbytes[9] = Command_Packet.command[1];
    packetbytes[10] = Command_Packet_GetLowByte(checksum);
    packetbytes[11] = Command_Packet_GetHighByte(checksum);
    
    return Packetbytes;
}
 
// Converts the int to bytes and puts them into the paramter array
void Command_Packet_ParameterFromInt(unsigned int i) {
    Command_Packet.Parameter[0] = (i & 0x000000ff);
    Command_Packet.Parameter[1] = (i & 0x0000ff00) >> 8;
    Command_Packet.Parameter[2] = (i & 0x00ff0000) >> 16;
    Command_Packet.Parameter[3] = (i & 0xff000000) >> 24;
}
 
// Returns the high byte from a word
unsigned char Command_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w >> 8) & 0x00FF;
}
 
// Returns the low byte from a word
unsigned char Command_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w & 0x00FF;
}
 
unsigned int Command_Packet_CalculateChecksum() {
    unsigned int w = 0;
 
    w += Command_Packet.COMMAND_START_CODE_1;
    w += Command_Packet.COMMAND_START_CODE_2;
    w += Command_Packet.COMMAND_DEVICE_ID_1;
    w += Command_Packet.COMMAND_DEVICE_ID_2;
    w += Command_Packet.Parameter[0];
    w += Command_Packet.Parameter[1];
    w += Command_Packet.Parameter[2];
    w += Command_Packet.Parameter[3];
    w += Command_Packet.command[0];
    w += Command_Packet.command[1];
 
    return w;
}
 
// Gets an int from the parameter bytes
unsigned int Response_Packet_IntFromParameter() {
    unsigned int retval = 0;
 
    retval = (retval << 8) + Response_Packet.ParameterBytes[3];
    retval = (retval << 8) + Response_Packet.ParameterBytes[2];
    retval = (retval << 8) + Response_Packet.ParameterBytes[1];
    retval = (retval << 8) + Response_Packet.ParameterBytes[0];
 
    return retval;
}
 
// calculates the checksum from the bytes in the Packet
//unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
 
    for(i = 1; i < length + 1; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}
 
// Returns the high byte from a word
unsigned char Response_Packet_GetHighByte(unsigned int w) {
    return (unsigned char)(w>>8)&0x00FF;
}
 
// Returns the low byte from a word
unsigned char Response_Packet_GetLowByte(unsigned int w) {
    return (unsigned char)w&0x00FF;
}
 
// parses bytes into one of the possible errors from the finger print scanner
//Response_Packet::ErrorCodes::Errors_Enum Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low)
unsigned int Response_Packet_ErrorCodes_ParseFromBytes(unsigned char high, unsigned char low) {
    Response_Packet.ErrorCodes.e = INVALID;
 
    if (high == 0x00)
    {
    }
    // grw 01/03/15 - replaced if clause with else clause for any non-zero high byte
    // if (high == 0x01)
    // {
    else {
        switch(low) {
            case 0x00: Response_Packet.ErrorCodes.e = NO_ERROR; break;
            case 0x01: Response_Packet.ErrorCodes.e = NACK_TIMEOUT; break;
            case 0x02: Response_Packet.ErrorCodes.e = NACK_INVALID_BAUDRATE; break;
            case 0x03: Response_Packet.ErrorCodes.e = NACK_INVALID_POS; break;
            case 0x04: Response_Packet.ErrorCodes.e = NACK_IS_NOT_USED; break;
            case 0x05: Response_Packet.ErrorCodes.e = NACK_IS_ALREADY_USED; break;
            case 0x06: Response_Packet.ErrorCodes.e = NACK_COMM_ERR; break;
            case 0x07: Response_Packet.ErrorCodes.e = NACK_VERIFY_FAILED; break;
            case 0x08: Response_Packet.ErrorCodes.e = NACK_IDENTIFY_FAILED; break;
            case 0x09: Response_Packet.ErrorCodes.e = NACK_DB_IS_FULL; break;
            case 0x0A: Response_Packet.ErrorCodes.e = NACK_DB_IS_EMPTY; break;
            case 0x0B: Response_Packet.ErrorCodes.e = NACK_TURN_ERR; break;
            case 0x0C: Response_Packet.ErrorCodes.e = NACK_BAD_FINGER; break;
            case 0x0D: Response_Packet.ErrorCodes.e = NACK_ENROLL_FAILED; break;
            case 0x0E: Response_Packet.ErrorCodes.e = NACK_IS_NOT_SUPPORTED; break;
            case 0x0F: Response_Packet.ErrorCodes.e = NACK_DEV_ERR; break;
            case 0x10: Response_Packet.ErrorCodes.e = NACK_CAPTURE_CANCELED; break;
            case 0x11: Response_Packet.ErrorCodes.e = NACK_INVALID_PARAM; break;
            case 0x12: Response_Packet.ErrorCodes.e = NACK_FINGER_IS_NOT_PRESSED; break;
        };
    }
 
    return Response_Packet.ErrorCodes.e;
}
 
// checks to see if the byte is the proper value, and logs it to the serial channel if not
bool Response_Packet_CheckParsing(unsigned char b, unsigned char propervalue, unsigned char alternatevalue, char* varname, bool UseSerialDebug) {
    bool retval;
    char str[22];
 
    retval = (b != propervalue) && (b != alternatevalue);
 
    if((UseSerialDebug) && (retval)) {
        UART5_Write_Text("\r\n");
        UART5_Write_Text("Response_Packet parsing error \r\n");
        UART5_Write_Text(varname);
        UART5_Write_Text(" ");
        ByteToHex(propervalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" || ");
        ByteToHex(alternatevalue, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
        UART5_Write_Text(" != ");
        ByteToHex(b, str);
        Ltrim(str);
        Rtrim(str);
        UART5_Write_Text(str);
    }
    
    return retval;
}
 
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[4], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[9], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[9] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[10], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[11], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[12], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[6], buffer[5]);
 
    Response_Packet.ParameterBytes[0] = buffer[5];
    Response_Packet.ParameterBytes[1] = buffer[6];
    Response_Packet.ParameterBytes[2] = buffer[7];
    Response_Packet.ParameterBytes[3] = buffer[8];
    Response_Packet.ResponseBytes[0] = buffer[9];
    Response_Packet.ResponseBytes[1] = buffer[10];
 
    for(i = 1; i < 13; i++) {
        Response_Packet.RawBytes[i-1] = buffer[i];
    }
}
 
/*
void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[0], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[8] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[5], buffer[4]);
 
    Response_Packet.ParameterBytes[0] = buffer[4];
    Response_Packet.ParameterBytes[1] = buffer[5];
    Response_Packet.ParameterBytes[2] = buffer[6];
    Response_Packet.ParameterBytes[3] = buffer[7];
    Response_Packet.ResponseBytes[0] = buffer[8];
    Response_Packet.ResponseBytes[1] = buffer[9];
 
    for(i = 0; i < 12; i++) {
        Response_Packet.RawBytes[i] = buffer[i];
    }
}
*/
 
void FPS_GT511C3_SendCommand(unsigned char cmd[], int length) {
    unsigned int i;
    unsigned char str[22];
 
    for(i = 0; i < length; i++) {
         UART2_Write(cmd[i]);
    }
 
    if(UseSerialDebug) {
        UART5_Write_Text("FPS - SEND: ");
        for(i = 0; i < length; i++) {
           ByteToHex(cmd[i], str);
           Ltrim(str);
           Rtrim(str);
           strcat(str, " ");
           UART5_Write_Text(str);
        }
 
        UART5_Write_Text("\r\n");
    }
}
 
void FPS_GT511C3_PrintResponseBytes(unsigned char response[], unsigned int length) {
     unsigned int i;
     unsigned char str[22];
     
     for(i = 0; i < length; i++) {
         ByteToHex(response[i], str);
         Ltrim(str);
         Rtrim(str);
         strcat(str, " ");
         UART5_Write_Text(str);
     }
}
 
// sends a byte to the serial debugger in the hex format we want EX "0F"
void FPS_GT511C3_serialPrintHex(unsigned char data_) {
    char tmp[22];
    IntToHex(data_, tmp);
    Ltrim(tmp);
    Rtrim(tmp);
    UART5_Write_Text(tmp);
}
 
// sends the bye aray to the serial debugger in our hex format EX: "00 AF FF 10 00 13"
void FPS_GT511C3_SendToSerial(unsigned char data_[], int length) {
    bool first = TRUE;
    unsigned int i;
 
    UART5_Write_Text(""");
 
    for(i = 0; i < length; i++) {
       if(first)first = FALSE;
       else UART5_Write_Text(" ");
       FPS_GT511C3_serialPrintHex(data_[i]);
    }
 
    UART5_Write_Text(""");
}
 
// Gets the response to the command from the software serial channel (and waits for it)
void FPS_GT511C3_GetResponse() {
    /*
    unsigned char firstbyte = 0;
    bool done = FALSE;
    unsigned char resp[12];
    unsigned int i;
 
    while(done == FALSE) {
       firstbyte = (unsigned char)UART2_Read();
 
       if(firstbyte == Response_Packet.COMMAND_START_CODE_1) {
            done = TRUE;
       }
    }
 
    resp[0] = firstbyte;
 
    for(i = 1; i < 12; i++) {
          resp[i] = (unsigned char)UART2_Read();
    }
    */
    Delay_ms(500);
    Response_Packet_Response_Packet(resp, UseSerialDebug);
 
    if(UseSerialDebug) {
        UART5_Write_Text("FPS - RECV: ");
        FPS_GT511C3_PrintResponseBytes(Response_Packet.Raw  Bytes, 12);
        UART5_Write_Text("\r\n\r\n");
    }
}
 
bool FPS_GT511C3_ChangeBaudRate(int baud) {
    unsigned char* Packetbytes;
    bool retval;
    
    if((baud == 9600) || (baud == 19200) || (baud == 38400) || (baud == 57600) || (baud == 115200)) {
        if(UseSerialDebug)UART5_Write_Text("FPS - ChangeBaudRate\r\n");
        Command_Packet.Commands.Command = Open;
        Command_Packet_ParameterFromInt(baud);
        Packetbytes = Command_Packet_GetPacketBytes();
        FPS_GT511C3_SendCommand(Packetbytes, 12);
        FPS_GT511C3_GetResponse();
        ResetVars();
        retval = Response_Packet.ACK;
        
        if(retval) {
            UART2_Init(baud);
            Delay_ms(200);
        }
 
        return retval;
    }
    
    return FALSE;
}
 
void FPS_GT511C3_Open() {
    unsigned char* Packetbytes;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Open\r\n");
    Command_Packet.Commands.Command = Open;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    //PrintResponseBytes(resp);
    ResetVars();
}
 
// Turns on or off the LED backlight
// Parameter: true turns on the backlight, false turns it off
// Returns: True if successful, false if not
bool FPS_GT511C3_SetLED(bool on) {
    unsigned char* Packetbytes;
    bool retval;
    
    Command_Packet.Commands.Command = CmosLed;
    
    if(on) {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED on\r\n");
       Command_Packet.Parameter[0] = 0x01;
    }
    else {
       if(UseSerialDebug)UART5_Write_Text("FPS - LED off\r\n");
       Command_Packet.Parameter[0] = 0x00;
    }
    
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = TRUE;
    if(Response_Packet.ACK == FALSE)retval = FALSE;
    
    return retval;
}
 
// Gets the number of enrolled fingerprints
// Return: The total number of enrolled fingerprints
unsigned int FPS_GT511C3_GetEnrollCount() {
    unsigned char* Packetbytes;
    unsigned int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - GetEnrolledCount\r\n");
    Command_Packet.Commands.Command = GetEnrollCount;
    Command_Packet.Parameter[0] = 0x00;
    Command_Packet.Parameter[1] = 0x00;
    Command_Packet.Parameter[2] = 0x00;
    Command_Packet.Parameter[3] = 0x00;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
 
    retval = Response_Packet_IntFromParameter();
    return retval;
}
 
// checks to see if the ID number is in use or not
// Parameter: 0-199
// Return: True if the ID number is enrolled, false if not
bool FPS_GT511C3_CheckEnrolled(unsigned int id) {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - CheckEnrolled\r\n");
    Command_Packet.Commands.Command = CheckEnrolled;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    retval = Response_Packet.ACK;
    
    return retval;
}
 
// Starts the Enrollment Process
// Parameter: 0-199
// Return:
//        0 - ACK
//        1 - Database is full
//        2 - Invalid Position
//        3 - Position(ID) is already used
unsigned int FPS_GT511C3_EnrollStart(unsigned int id) {
    unsigned char* Packetbytes;
    unsigned int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - EnrollStart\r\n");
    Command_Packet.Commands.Command = EnrollStart;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
         if(Response_Packet.ErrorCodes.Error == NACK_DB_IS_FULL)retval = 1;
         if(Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 2;
         if(Response_Packet.ErrorCodes.Error == NACK_IS_ALREADY_USED)retval = 3;
    }
 
    return retval;
}
 
// Gets the first scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll1() {
    unsigned char* Packetbytes;
    unsigned int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll1;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Second scan of an enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll2() {
    unsigned char* Packetbytes;
    unsigned int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll2;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Gets the Third scan of an enrollment
// Finishes Enrollment
// Return:
//        0 - ACK
//        1 - Enroll Failed
//        2 - Bad finger
//        3 - ID in use
unsigned int FPS_GT511C3_Enroll3() {
    unsigned char* Packetbytes;
    unsigned int retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - Enroll1\r\n");
    Command_Packet.Commands.Command = Enroll3;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
 
    if(retval < 200) retval = 3; else retval = 0;
 
    if(Response_Packet.ACK == FALSE)
    {
        if(Response_Packet.ErrorCodes.Error == NACK_ENROLL_FAILED)retval = 1;
        if(Response_Packet.ErrorCodes.Error == NACK_BAD_FINGER)retval = 2;
    }
 
 
    if(Response_Packet.ACK) return 0; else return retval;
}
 
// Checks to see if a finger is pressed on the FPS
// Return: true if finger pressed, false if not
bool FPS_GT511C3_IsPressFinger() {
    unsigned char* Packetbytes;
    bool retval;
    unsigned int pval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - IsPressFinger\r\n");
    Command_Packet.Commands.Command = IsPressFinger;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = FALSE;
    pval = Response_Packet.ParameterBytes[0];
    pval += Response_Packet.ParameterBytes[1];
    pval += Response_Packet.ParameterBytes[2];
    pval += Response_Packet.ParameterBytes[3];
    
    if(pval == 0)retval = TRUE;
 
    return retval;
}
 
// Deletes the specified ID (enrollment) from the database
// Parameter: 0-199 (id number to be deleted)
// Returns: true if successful, false if position invalid
bool FPS_GT511C3_DeleteID(int id) {
    unsigned char* Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteID\r\n");
    Command_Packet.Commands.Command = DeleteID;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Deletes all IDs (enrollments) from the database
// Returns: true if successful, false if db is empty
bool FPS_GT511C3_DeleteAll() {
    unsigned char* Packetbytes;
    bool retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - DeleteAll\r\n");
    Command_Packet.Commands.Command = DeleteAll;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
// Checks the currently pressed finger against a specific ID
// Parameter: 0-199 (id number to be checked)
// Returns:
//        0 - Verified OK (the correct finger)
//        1 - Invalid Position
//        2 - ID is not in use
//        3 - Verified FALSE (not the correct finger)
unsigned int FPS_GT511C3_Verify1_1(int id) {
    unsigned char* Packetbytes;
    unsigned int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Verify1_1\r\n");
    Command_Packet.Commands.Command = Verify1_1;
    Command_Packet_ParameterFromInt(id);
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = 0;
    
 
    if(Response_Packet.ACK == FALSE)
    {
          retval = 3; // grw 01/03/15 - set default value of not verified before assignment
          
          if (Response_Packet.ErrorCodes.Error == NACK_INVALID_POS)retval = 1;
          if (Response_Packet.ErrorCodes.Error == NACK_IS_NOT_USED) retval = 2;
          if (Response_Packet.ErrorCodes.Error == NACK_VERIFY_FAILED) retval = 3;
    }
 
 
    return retval;
}
 
// Checks the currently pressed finger against all enrolled fingerprints
// Returns:
//        0-199: Verified against the specified ID (found, and here is the ID number)
//        200: Failed to find the fingerprint in the database
unsigned int FPS_GT511C3_Identify1_N() {
    unsigned char* Packetbytes;
    unsigned int retval;
    
    if(UseSerialDebug)UART5_Write_Text("FPS - Identify1_N\r\n");
    Command_Packet.Commands.Command = Identify1_N;
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet_IntFromParameter();
    
    if(retval > 200) retval = 200;
 
    return retval;
}
 
// Captures the currently pressed finger into onboard ram use this prior to other commands
// Parameter: true for high quality image(slower), false for low quality image (faster)
// Generally, use high quality for enrollment, and low quality for verification/identification
// Returns: True if ok, false if no finger pressed
bool FPS_GT511C3_CaptureFinger(bool highquality) {
 
    unsigned char *Packetbytes;
    bool retval;
 
    if(UseSerialDebug)UART5_Write_Text("FPS - CaptureFinger\r\n");
    Command_Packet.Commands.Command = CaptureFinger;
    if(highquality) {
        Command_Packet_ParameterFromInt(1);
    }
    else {
        Command_Packet_ParameterFromInt(0);
    }
    
    Packetbytes = Command_Packet_GetPacketBytes();
    memset(resp, '\0', sizeof(resp));
    FPS_GT511C3_SendCommand(Packetbytes, 12);
    FPS_GT511C3_GetResponse();
    ResetVars();
    retval = Response_Packet.ACK;
 
    return retval;
}
 
void Enroll() {
     // Enroll test
    unsigned char str[17];
    // find open enroll id
    static int enrollid = 0;
    bool bret;
    unsigned int iret;
    bool usedid = TRUE;
    
    while(usedid == TRUE) {
        usedid = FPS_GT511C3_CheckEnrolled(enrollid);
        if(usedid == TRUE)enrollid++;
    }
    
    IntToStr(enrollid, str);
    Ltrim(str);
    Rtrim(str);
    strcat(str, "\r\n");
    UART5_Write_Text(str);
 
    FPS_GT511C3_EnrollStart(enrollid);
 
    // enroll
    UART5_Write_Text("Press finger to Enroll #");
    IntToStr(enrollid, str);
    Ltrim(str);
    Rtrim(str);
    strcat(str, "\r\n");
    UART5_Write_Text(str);
    while(FPS_GT511C3_IsPressFinger() == FALSE);//Delay_ms(200);
    bret = FPS_GT511C3_CaptureFinger(TRUE);
    iret = 0;
    
    if(bret != FALSE) {
        UART5_Write_Text("Remove finger\r\n");
        FPS_GT511C3_Enroll1();
        while(FPS_GT511C3_IsPressFinger() == TRUE);//Delay_ms(100);
        UART5_Write_Text("Press same finger again\r\n");
        while(FPS_GT511C3_IsPressFinger() == FALSE);//Delay_ms(100);
        bret = FPS_GT511C3_CaptureFinger(TRUE);
        
        if(bret != FALSE)
        {
                UART5_Write_Text("Remove finger\r\n");
                FPS_GT511C3_Enroll2();
                while(FPS_GT511C3_IsPressFinger() == TRUE);//Delay_ms(200);
                UART5_Write_Text("Press same finger yet again\r\n");
                while(FPS_GT511C3_IsPressFinger() == FALSE);//Delay_ms(200);
                bret = FPS_GT511C3_CaptureFinger(TRUE);
                
                if(bret != FALSE) {
                    UART5_Write_Text("Remove finger\r\n");
                    
                    iret = FPS_GT511C3_Enroll3();
                    if(iret == 0) {
                        UART5_Write_Text("Enrolling Successfull\r\n");
                    }
                    else {
                        UART5_Write_Text("Enrolling Failed with error code:");
                        IntToStr(iret, str);
                        Ltrim(str);
                        Rtrim(str);
                        strcat(str, "\r\n");
                        UART5_Write_Text(str);
                    }
                }
                else UART5_Write_Text("Failed to capture third finger\r\n");
        }
        else UART5_Write_Text("Failed to capture second finger\r\n");
    }
    else UART5_Write_Text("Failed to capture first finger\r\n");
}
 
void UART2() iv IVT_UART_2 ilevel 2 ics ICS_AUTO {
    
    if(gdone = TRUE) {
       resp[gIndex++] = UART2_Read();
    }
    else if(gdone == FALSE) {
       gfirstbyte = UART2_Read();
       
       if(gfirstbyte == Response_Packet.COMMAND_START_CODE_1) {
            resp[0] = gfirstbyte;
            gIndex = 1;
            gdone = TRUE;
       }
    }
    
    U2RXIF_bit = 0;
}
 
void main() {
 
    AD1PCFG = 0xFFFF;
    JTAGEN_bit = 0;
    
    TRISB = 0x00000000;
 
    Command_Packet.COMMAND_START_CODE_1 = 0x55;
    Command_Packet.COMMAND_START_CODE_2 = 0xAA;
    Command_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Command_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    Response_Packet.COMMAND_START_CODE_1 = 0x55;
    Response_Packet.COMMAND_START_CODE_2 = 0xAA;
    Response_Packet.COMMAND_DEVICE_ID_1 = 0x01;
    Response_Packet.COMMAND_DEVICE_ID_2 = 0x00;
    
    UART5_Init(9600);
    Delay_ms(200);
    UART2_Init(9600);
    Delay_ms(200);
    
    U2IP0_bit = 0;                     // Set UART2 interrupt
    U2IP1_bit = 1;                     // Set interrupt priorities
    U2IP2_bit = 1;                     // Set UART2 interrupt to level 6
 
    U2RXIE_bit = 1;
    U2RXIF_bit = 0;
    EnableInterrupts();       // Enable all interrupts
    
    UseSerialDebug = TRUE;
    
    Delay_ms(3000);
    
    FPS_GT511C3_Open();
    Delay_ms(200);
    FPS_GT511C3_SetLED(1);
    Delay_ms(200);
    FPS_GT511C3_DeleteAll();
    
    while(1) {
    
          Delay_ms(1000);
          Enroll();
          //FPS_GT511C3_SetLED(1);
          //Delay_ms(2000);
          //FPS_GT511C3_SetLED(0);
    }
}



The changes made are like this.

This is the original C++ Code.

Code C - [expand]
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// creates and parses a response packet from the finger print scanner
Response_Packet::Response_Packet(byte* buffer, bool UseSerialDebug)
{
    CheckParsing(buffer[0], COMMAND_START_CODE_1, COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    CheckParsing(buffer[1], COMMAND_START_CODE_2, COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    CheckParsing(buffer[2], COMMAND_DEVICE_ID_1, COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    CheckParsing(buffer[3], COMMAND_DEVICE_ID_2, COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    CheckParsing(buffer[8], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if (buffer[8] == 0x30) ACK = true; else ACK = false;
    CheckParsing(buffer[9], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    word checksum = CalculateChecksum(buffer, 10);
    byte checksum_low = GetLowByte(checksum);
    byte checksum_high = GetHighByte(checksum);
    CheckParsing(buffer[10], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    CheckParsing(buffer[11], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
    
    Error = ErrorCodes::ParseFromBytes(buffer[5], buffer[4]);
 
    ParameterBytes[0] = buffer[4];
    ParameterBytes[1] = buffer[5];
    ParameterBytes[2] = buffer[6];
    ParameterBytes[3] = buffer[7];
    ResponseBytes[0]=buffer[8];
    ResponseBytes[1]=buffer[9];
    for (int i=0; i < 12; i++)
    {
        RawBytes[i]=buffer[i];
    }
}


This is the modified C function.

Code C - [expand]
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void Response_Packet_Response_Packet(unsigned char* buffer, bool UseSerialDebug) {
 
    unsigned int checksum, i;
    unsigned char checksum_low;
    unsigned char checksum_high;
 
    Response_Packet_CheckParsing(buffer[1], Response_Packet.COMMAND_START_CODE_1, Response_Packet.COMMAND_START_CODE_1, "COMMAND_START_CODE_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[2], Response_Packet.COMMAND_START_CODE_2, Response_Packet.COMMAND_START_CODE_2, "COMMAND_START_CODE_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[3], Response_Packet.COMMAND_DEVICE_ID_1, Response_Packet.COMMAND_DEVICE_ID_1, "COMMAND_DEVICE_ID_1", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[4], Response_Packet.COMMAND_DEVICE_ID_2, Response_Packet.COMMAND_DEVICE_ID_2, "COMMAND_DEVICE_ID_2", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[9], 0x30, 0x31, "AckNak_LOW", UseSerialDebug);
    if(buffer[9] == 0x30)Response_Packet.ACK = TRUE; else Response_Packet.ACK = FALSE;
    Response_Packet_CheckParsing(buffer[10], 0x00, 0x00, "AckNak_HIGH", UseSerialDebug);
 
    checksum = Response_Packet_CalculateChecksum(buffer, 10);
    checksum_low = Response_Packet_GetLowByte(checksum);
    checksum_high = Response_Packet_GetHighByte(checksum);
    Response_Packet_CheckParsing(buffer[11], checksum_low, checksum_low, "Checksum_LOW", UseSerialDebug);
    Response_Packet_CheckParsing(buffer[12], checksum_high, checksum_high, "Checksum_HIGH", UseSerialDebug);
 
    Response_Packet.ErrorCodes.Error = Response_Packet_ErrorCodes_ParseFromBytes(buffer[6], buffer[5]);
 
    Response_Packet.ParameterBytes[0] = buffer[5];
    Response_Packet.ParameterBytes[1] = buffer[6];
    Response_Packet.ParameterBytes[2] = buffer[7];
    Response_Packet.ParameterBytes[3] = buffer[8];
    Response_Packet.ResponseBytes[0] = buffer[9];
    Response_Packet.ResponseBytes[1] = buffer[10];
 
    for(i = 1; i < 13; i++) {
        Response_Packet.RawBytes[i-1] = buffer[i];
    }
}


Another changes is to this struct.

Code C - [expand]
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struct Resp_Packet {
    struct ErrCodes {
       enum Errs_Enum {
          NO_ERROR                    = 0x0000,        // Default value. no error
          NACK_TIMEOUT                = 0x1001,        // Obsolete, capture timeout
          NACK_INVALID_BAUDRATE       = 0x1002,        // Obsolete, Invalid serial baud rate
          NACK_INVALID_POS            = 0x1003,        // The specified ID is not between 0~199
          NACK_IS_NOT_USED            = 0x1004,        // The specified ID is not used
          NACK_IS_ALREADY_USED        = 0x1005,        // The specified ID is already used
          NACK_COMM_ERR               = 0x1006,        // Communication Error
          NACK_VERIFY_FAILED          = 0x1007,        // 1:1 Verification Failure
          NACK_IDENTIFY_FAILED        = 0x1008,        // 1:N Identification Failure
          NACK_DB_IS_FULL             = 0x1009,        // The database is full
          NACK_DB_IS_EMPTY            = 0x100A,        // The database is empty
          NACK_TURN_ERR               = 0x100B,        // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
          NACK_BAD_FINGER             = 0x100C,        // Too bad fingerprint
          NACK_ENROLL_FAILED          = 0x100D,        // Enrollment Failure
          NACK_IS_NOT_SUPPORTED       = 0x100E,        // The specified command is not supported
          NACK_DEV_ERR                = 0x100F,        // Device Error, especially if Crypto-Chip is trouble
          NACK_CAPTURE_CANCELED       = 0x1010,        // Obsolete, The capturing is canceled
          NACK_INVALID_PARAM          = 0x1011,        // Invalid parameter
          NACK_FINGER_IS_NOT_PRESSED  = 0x1012,        // Finger is not pressed
          INVALID                     = 0XFFFF         // Used when parsing fails
       }Error, e;
 
 
    }ErrorCodes;
    
    //Response_Packet(unsigned char* buffer, bool UseSerialDebug);
    unsigned char RawBytes[12];
    unsigned char ParameterBytes[4];
    unsigned char ResponseBytes[2];
    bool ACK;
    unsigned char COMMAND_START_CODE_1;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_START_CODE_2;        // Static byte to mark the beginning of a command packet        -        never changes
    unsigned char COMMAND_DEVICE_ID_1;        // Device ID Byte 1 (lesser byte)                                                        -        theoretically never changes
    unsigned char COMMAND_DEVICE_ID_2;        // Device ID Byte 2 (greater byte)                                                        -        theoretically never changes
 
}Response_Packet;


The changes in the struct is 

Code C - [expand]
1

unsigned char RawBytes[13];


Yet another change is

Code C - [expand]
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// calculates the checksum from the bytes in the Packet
//unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
 
    for(i = 0; i < length; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}


above function changed to

Code C - [expand]
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// calculates the checksum from the bytes in the Packet
//unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
unsigned int Response_Packet_CalculateChecksum(unsigned char buffer[], int length) {
    unsigned int checksum = 0;
    unsigned int i = 0;
 
    for(i = 1; i < length + 1; i++) {
        checksum += buffer[i];
    }
 
    return checksum;
}



Now it is printing IsPressFinger but it is not reading the finger. What is the problem ?

 

Attachments

  • Arduino FPS GT-511C3 1.png
    Arduino FPS GT-511C3 1.png
    174.8 KB · Views: 121
  • Arduino FPS GT-511C3.png
    Arduino FPS GT-511C3.png
    182.5 KB · Views: 120
  • Arduino Response.pdf
    9.3 KB · Views: 86
  • doesn't match.png
    doesn't match.png
    66.6 KB · Views: 122
  • Fingerprint_Scanner-TTL-master.rar
    12.9 KB · Views: 124
  • mikroC PRO PIC32 C Code Response.pdf
    14.6 KB · Views: 135
Last edited:

I fixed the code and now it is working fine. See the attached PDF. It shows the response. I will post the complete C Code soon.
 

Attachments

  • mikroC PRO PIC32 Code Working.pdf
    23.9 KB · Views: 185

Here is the Complete mikroC PRO PIC32 project. See the response PDF posted in post # . Before showing "Enrolling is successful" message it shows "Response_Packet_Parsing _Error" messages. After displaying "Enrolling is Successful" it shows "Check Enrolled" and "EnrollStart" messages and then shows "Press finger to Enroll #1". So, previous ID #0 is enrolled and it has incremented the counter to 1.

So, enrolling was successful but I don't know why the error message even though the sent bytes and response bytes are correct.

Last two bytes of the Sent bytes and Response bytes are the checksum bytes. There are total 12 bytes in each. The sum of first 10 bytes is the checksum.

I have fixed the issue with the UART2 Interrupt code and now the received bytes are not 1 element shifted and so I have reverted the modifies functions to the original functions.

So, there is no modified code. The same code as Arduino Library is used except I am using Hardware Serial ISR to receive the response and Arduino Library uses Software UART for FPS.
 

Attachments

  • GT511C3.rar
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Last edited:

I have fixed all issues. There were two issues.

1. It was giving "Response_Packet_Parsing_Error.
2. The sensor was not working well with PIC32 compared to the working with Arduino.

I fixed the first issue by using a proper delay of 1200 ms in the
Code: 
Respone_Packet_GetRespone()
function.

I fixed the second issue in hardware. In Arduino I was powering the Sensor from 5V and in PIC32 (EasyPIC Fusion v7 development board) I was powering it from 3.3V. The datasheet of the sensor module mentions that it works from 3.3V - 6V. I powered the sensor module from 5V in PIC32 board and it worked fine without problems.

Don't power the sensor module from 3.3V and bang your head. Use 5V to power it and if you are using it with Arduino or 5V MCUs then you have to drop the MCU Tx pin voltage to 3.3V to feed it to Rx of Sensor module.

I am attaching the latest and final project files and the response I got with and without debug as PDF files.

- - - Updated - - -

This is the fingerprint sensor module I have used.

https://www.rhydolabz.com/index.php?main_page=product_info&products_id=1216
 

Attachments

  • GT511C3 With Debug.rar
    35 KB · Views: 86
  • GT511C3 Without Debug.rar
    35.1 KB · Views: 77
  • Response Showing Working of GT511C3 With Debug.pdf
    10.6 KB · Views: 152
  • Response Showing Working of GT511C3 Without Debug.pdf
    3.5 KB · Views: 162
Last edited:
Good that managed it.

I didn't previously notice that this is a PIC32 project. An alternative way to port the Arduino C++ code would be to use Microchip C32 or XC32 which natively supports C++.
 
Yes, I thought about using XC32++ but I need to use TFT+Touchscreen, FAT32 microSD Card, MP3 Player (for voice messages like - "enrolling", "attendance registered", etc...), Buzzer, DS1307 (for date and time of attendance) and mikroE has libraries for all of these and it is easier for me to use use mikroC PRO PIC32 because I have much experience with mikroC PRO PIC. If everything works fine with mikroC PRO PIC32 project then later I will try to implement it in XC32++ code. For that I have to make TFT+Touchscreen Library. In my mikroC PRO PIC32 project I am also providing USB Device function so that the .csv file of attendance on th microSD Card can be opened on PC using USB connectivity. For this mikroE has USB Device Library and I have used it.

Another thing is mikroE has VisualTFT software for creating the GUI for TFT and it generates the required code. So, it is very easier for me to use mikroC PRO PIC32.

But once I make XC32++ TFT, FAT32, Libraries then I will surely implement it in XC32++ code.

I have to complete this project in one month and that is another reason for using mikroC PRO PIC32. I am using the below mentioned libraries with it.

FAT32
USB Device
RTC
TFT_8_Bit

and ofcourse the FPS_GT511C3 C Library.

Another reason for not using XC32++ now is that it is a problem creating the GUI for TFT. I have to make it from scratch or I have to port the VisualTFT generated mikroC PRO PIC32 TFT+Touchscreen Code to XC32++.
 
I do not believe that you have to re-write the functions into C++ as (according to the XC32 User Guide) the compiler handles both C and C++ variants and will link them together. (You can also mix in assembler files to be called by and to call C/C++ functions.)
There may well be other porting issues, but I don't think C vs C++ is one of them.
Susan
 

Made a small change

In the
Code: 
FPS_GT511C3_GetResponse()

there was a nasty
Code: 
Delay_ms(1200)

I replaced it with below code.

Code C - [expand]
1

while(gIndex != 12);


so that unless 12 response bytes aren't received it sits there in the loop.

Also I removed

Code: 
ResetVars();

function call from all FPS_GT511C3_xxx() functions and put it inside

Code: 
FPS_GT511C3_GetResponse()

function.

Now the enrolling is smooth.
 

Attachments

  • GT511C3.rar
    34.6 KB · Views: 86

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