If you can send through a PC then simply duplicate the connections. However, YOU NEED TO ADD AN RS-232 CONVERTER (not shown in your schematic). Without it, you will NOT have the correct voltage levels or logic state require to communicate between the uP and the Modem.revenge said:
GSM Man said:
ronydc said:
Chip type : ATmega16
Program type : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model : Small
External RAM size : 0
Data Stack size : 256
*****************************************************/
#include <mega16.h>
// Standard Input/Output functions
#include <stdio.h>
#include <string.h>
#include <delay.h>
// Declare your global variables here
#define NO_OF_SEND_TRY 3
// Declare your global variables here
char data; // Use for data read purpose
char Msg_source[15];
char Msg_command[30];
int New_msg_flag =0;
int Handshake_status =0;
int Delete_status=0;
int No_of_send_msg1=0;
int No_of_send_msg2=0;
//int i;
//1. This function is used to read the available data
//from USART. This function will wait untill data is
//available.
char USARTReadChar()
{
//Wait untill a data is available
while(!(UCSRA & (1<<RXC)))
{
//Do nothing
}
//Now USART has got data from host and is available is buffer
return UDR;
}
//This fuction writes the given "data" to the USART which then transmit it via TX line
void USARTWriteChar(char data)
{
//Wait untill the transmitter is ready
while(!(UCSRA & (1<<UDRE)))
{
//Do nothing
}
//Now write the data to USART buffer
UDR=data;
}
int Handshake()
{
int response1=0;
int response2=0;
/* Now send the AT command */
USARTWriteChar('A');
USARTWriteChar('T');
USARTWriteChar('\n');
//Check whether response is OK or not
delay_ms(300);
data=USARTReadChar();
if(data=='O')
{
data=USARTReadChar();
if(data=='K')
response1=1;
else
PORTA |=(1<<2);
}
else
PORTA |=(1<<1);
USARTWriteChar('A');
USARTWriteChar('T');
USARTWriteChar('+');
USARTWriteChar('C');
USARTWriteChar('M');
USARTWriteChar('G');
USARTWriteChar('F');
USARTWriteChar('=');
USARTWriteChar('1');
USARTWriteChar('\n');
//Check whether response is OK or not
delay_ms(300);
data=USARTReadChar();
if(data=='O')
{
data=USARTReadChar();
if(data=='K')
response2=1;
else
PORTA |=(1<<4);
}
else
PORTA |=(1<<3);
if (response1 && response2)
return 1;
else
return 0;
}
void Create_send_msg(int index)
{
char Output_msg [80];
char Ctrl_Z[3];
int i=0;
Ctrl_Z[0]=(char)26;
Ctrl_Z[1]='\0';
strcpy (Output_msg,"AT+CMGS=\"01711136358\"\n");
if (index == 7)
strcat (Output_msg,"Port D bit 7 is ON");
if (index == 6)
strcat (Output_msg,"Port D bit 6 is ON");
strcat (Output_msg,Ctrl_Z);
while (Output_msg[i]!='\0')
{
USARTWriteChar(Output_msg[i]);
i++;
}
delay_ms(100);
}
void Delete_msg()
{
Delete_status=0;
USARTWriteChar('A');
USARTWriteChar('T');
USARTWriteChar('+');
USARTWriteChar('C');
USARTWriteChar('M');
USARTWriteChar('G');
USARTWriteChar('D');
USARTWriteChar('=');
USARTWriteChar('1');
USARTWriteChar(',');
USARTWriteChar('2');
USARTWriteChar('\n');
//Check whether response is OK or not
delay_ms(100);
data=USARTReadChar();
if(data=='O')
data=USARTReadChar();
if(data=='K')
{
Delete_status=1;
PORTA |=(1<<5);
//PORTA3=1;
delay_ms(100);
}
}
void Process_msg()
{
int i;
/*This function is called when it comes from authenticated source
and then it already read the send device no and so discard the next
25 charecter to find the original message */
for(i=0;i<25;i++)
data=USARTReadChar();
i=0;
data=USARTReadChar();
//check for '.' as command ends with . Valid command can be
// bit 7 on. or bit 7 off.
while (data!='.')
{
Msg_command[i]=data;
i++;
data=USARTReadChar();
}
Msg_command[i]='\0';
if (strcmp(Msg_command, "bit 6 on")==0)
PORTA |=(1<<6);
//if (strcmp(Msg_command, "bit 5 on")==0)
// PORTB |=(1<<5);
if (strcmp(Msg_command, "bit 6 off")==0)
PORTA &=~(1<<6);
// if (strcmp(Msg_command, "bit 5 off")==0)
// PORTB &=~(1<<5);
delay_ms(100);
Delete_msg();
delay_ms(100);
}
void Read_msg()
{
/* Now send the AT + CMGL =1 command; This will read the 1st SMS*/
int i;
USARTWriteChar('A');
USARTWriteChar('T');
USARTWriteChar('+');
USARTWriteChar('C');
USARTWriteChar('M');
USARTWriteChar('G');
USARTWriteChar('R');
USARTWriteChar('=');
USARTWriteChar('1');
USARTWriteChar('\n');
delay_ms(100);
//Check whether response starts with '+' which indicate message arrives
data=USARTReadChar();
if(data!='+')
{
New_msg_flag=0;
}
else
{
New_msg_flag=1;
PORTA |=(1<<7);
//PORTA7=1;
delay_ms(300);
New_msg_flag=0;
for(i=0;i<20;i++) //discard the following 20 charecter to find the mobile no //
data=USARTReadChar();
for (i=0;i<14;i++) //collect the source device Identification Number //
{
data=USARTReadChar();
Msg_source[i]=data;
}
Msg_source[i]='\0';
if (!strcmp(Msg_source, "+8801711136358"))
{
Process_msg();
Delete_msg();
}
else
{
//From other source, so delete the message
Delete_msg();
}
}
}
// Declare your global variables here
void main(void)
{
// Declare your local variables here
// Input/Output Ports initialization
// Port A initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTA=0x00;
DDRA=0xFF;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x00;
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x33;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
while (1)
{
// Place your code here
//Check whether AT command performs correctly or not
//return positive if success
Handshake_status=Handshake();
if(Handshake_status==0)
{
PORTA |=(1<<0);
//PORTA0=1;
}
//Led will go high to indicate red as handshake failed
Read_msg();
//if (PORTD7==1 || PORTD6==1)
if ((PIND & (1<<PIND7))&&(No_of_send_msg1<NO_OF_SEND_TRY))
{
Create_send_msg(7);
delay_ms(300);
No_of_send_msg1++;
}
if(No_of_send_msg1==NO_OF_SEND_TRY)
{
//PORTD &=~(1<<7);
No_of_send_msg1=0;
Delete_msg();
}
if ((PIND & (1<<PIND6))&&(No_of_send_msg2<NO_OF_SEND_TRY))
{
Create_send_msg(6);
No_of_send_msg2++;
}
if(No_of_send_msg2==NO_OF_SEND_TRY)
{
//PORTD &=~(1<<6);
No_of_send_msg2=0;
Delete_msg();
}
}
}
