Bug program

Code C - [expand]
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#include <xc.h>
 
#define MFRC522_CS LATAbits.LATA5 // Chip Select for MFRC522
#define _XTAL_FREQ 16000000 // Internal oscillation frequency 16 MHz
#define LED PORTAbits.RA0
 
#pragma config FOSC = INTIO67    //Fosc=1000 Internal oscillator selection, I/O on RA6 and RA7
#pragma config PLLCFG = ON        //4xPLL
#pragma config PRICLKEN = ON    //primary clock
#pragma config FCMEN = OFF        //Fail-Safe Clock Monitor
 
#pragma config LVP = OFF     //In situ programming (ICSP) at low voltage
#pragma config PWRTEN = OFF //Startup timer
#pragma config WDTEN = OFF  //Watchdog disabled
#pragma config BOREN = OFF  //Power fluctuation detection (Brown-out)
#pragma config IESO = OFF    //after PWRT and POR see datasheet pg42
 
// Function prototypes
void SPI_Init(void);
unsigned char SPI_Transmit(unsigned char data);
void MFRC522_Write(unsigned char addr, unsigned char value);
unsigned char MFRC522_Read(unsigned char addr);
void MFRC522_Init(void);
unsigned char MFRC522_Request(unsigned char reqMode, unsigned char *TagType);
unsigned char MFRC522_ToCard(unsigned char command, unsigned char *sendData, unsigned char sendLen, unsigned char *backData, unsigned int *backLen);
void MFRC522_Halt(void);
void Oscillator_Init(void);
 
void main(void) 
{
    unsigned char status;
    unsigned char TagType[2];
    
    TRISAbits.RA0 = 0;
    TRISAbits.RA5 = 0;
    
    LED = 1;
    
    Oscillator_Init();
    __delay_ms(50);
    SPI_Init();
    __delay_ms(50);
    MFRC522_Init();
    __delay_ms(50);
 
    while (1) 
    {
        status = MFRC522_Request(0x26, TagType); //We check if a card is presented
 
        if (status == 1) 
        {
            LED = 0;
        }
        __delay_ms(500);
    }
}
void Oscillator_Init(void) 
{
    OSCCONbits.IRCF = 0b111;  // IRCF = 111 -> Internal frequency of 16 MHz
    OSCCONbits.SCS = 0b10;    // Select the internal oscillator as the system clock source
}
 
void SPI_Init(void) 
{
    // Configure SPI registers
    TRISCbits.TRISC3 = 0; // SCK (Clock) out
    TRISCbits.TRISC5 = 0; // SDO (Data Out) out
    TRISCbits.TRISC4 = 1; // SDI (Data In) in
    TRISAbits.TRISA5 = 0; // CS (Chip Select) out
 
    SSPCON1bits.SSPM = 0b0010; // SPI mode Master, FOSC/64
    SSPCON1bits.CKP = 0; // Clock idle state is low
    SSPSTATbits.CKE = 1; // Transmit on active to idle (rising edge)
    SSPCON1bits.SSPEN = 1; // Enable SPI
}
 
unsigned char SPI_Transmit(unsigned char data) 
{
    SSPBUF = data;               // Load buffer
    while (!SSPSTATbits.BF);     // Wait for the transmission to complete
    return SSPBUF;               //Return the received byte
}
 
void MFRC522_Write(unsigned char addr, unsigned char value) 
{
    MFRC522_CS = 0; //Enable MFRC522 (CS low)
    SPI_Transmit((addr << 1) & 0x7E); //Send register address with "write" command bit
    SPI_Transmit(value); // Send the data
    MFRC522_CS = 1; // Disable MFRC522 (CS high)
}
 
unsigned char MFRC522_Read(unsigned char addr) 
{
    unsigned char value;
    MFRC522_CS = 0; // Enable MFRC522 (CS low)
    SPI_Transmit(((addr << 1) & 0x7E) | 0x80); // Send address with read bit
    value = SPI_Transmit(0x00); // Read the data
    MFRC522_CS = 1; // Disable MFRC522 (CS high)
    return value;
}
 
void MFRC522_Init(void) 
{
    MFRC522_Write(0x01, 0x0F); // Command soft reset
 
    // Configure the transmission frequency
    MFRC522_Write(0x2A, 0x8D); // TModeReg
    MFRC522_Write(0x2B, 0x3E); // TPrescalerReg
    MFRC522_Write(0x2D, 30);   // TReloadRegH
    MFRC522_Write(0x2C, 0);    // TReloadRegL
    MFRC522_Write(0x15, 0x40); // TxASKReg
    MFRC522_Write(0x11, 0x3D); // ModeReg
 
    // Activer l'antenne
    unsigned char temp = MFRC522_Read(0x14);
    MFRC522_Write(0x14, temp | 0x03); // Enable bits to turn on the antenna
     __delay_ms(50);
}
 
unsigned char MFRC522_Request(unsigned char reqMode, unsigned char *TagType) 
{
    unsigned char status;
    unsigned int backBits; // Number of bits received
    
    MFRC522_Write(0x0D, 0x07); // BitFramingReg: set bit to start sending
    TagType[0] = reqMode;
    status = MFRC522_ToCard(0x0C, TagType, 1, TagType, &backBits); // Anti-collision control
    if ((status != 0) || (backBits != 0x10)) 
    {
        status = 0; // If no tag is detected
    }
    return status;
}
 
unsigned char MFRC522_ToCard(unsigned char command, unsigned char *sendData, unsigned char sendLen, unsigned char *backData, unsigned int *backLen) 
{
    unsigned char status = 0;
    unsigned char irqEn = 0x00;
    unsigned char waitIRq = 0x00;
    unsigned char lastBits;
    unsigned char n;
    unsigned int i;
 
    if (command == 0x0C) // Anti-collision control
    { 
        irqEn = 0x77;
        waitIRq = 0x30;
    }
 
    MFRC522_Write(0x02, irqEn | 0x80); // Enable IRQ
    MFRC522_Write(0x04, 0x00);         // Clear IRQs
    MFRC522_Write(0x01, 0x00);         // Idle
    // Writing data to send
    for (i = 0; i < sendLen; i++) 
    {
        MFRC522_Write(0x09, sendData[i]);
    }
    
    MFRC522_Write(0x01, command);      //Start transmitting
    
    i = 2000; // Wait for the end of the transmission (timeout)
    do 
    {
        n = MFRC522_Read(0x04);
        i--;
    } while ((i != 0) && !(n & 0x01) && !(n & waitIRq));
    
    if (i != 0) 
    {
        if (!(MFRC522_Read(0x06) & 0x1B)) 
        {
            status = 1;
            if (n & irqEn & 0x01) status = 0; // No card
        }
    }
    
    return status;
}
 
void MFRC522_Halt(void) 
{
    unsigned char haltData[4] = { 0x50, 0x00, 0x00, 0x00 };
    unsigned int unLen;
    MFRC522_ToCard(0x0C, haltData, 4, haltData, &unLen);
}