Interfacing pic 16f688 with TELIT gprs modem

[kha]

 

Hi,

 

I am interfacing pic 16f688 with TELIT gprs modem.

When i send AT command to GPRS modem, i was able to receive “OK” in hyper terminal.

 

similarly if i send AT command to GPRS modem from pic, it is responding with “OK”. I was not able to store this OK in micro controller.

This OK is coming till receiver pin of micro controller but not able to store in a buffer.

 

 

 

 

Here i am attaching the code, Please do the needfull.

 

#include “htc.h”

#include “Pic.h”

#include “pic16f688.h”

 

__CONFIG(FCMDIS & IESODIS & CPD & MCLREN & WDTDIS & INTIO & PWRTEN & INTCLK & BOREN);

 

unsigned char receive_byte; //variable to store byte from RCREG

unsigned char receive_array[10]; //Array to store the response

unsigned int long d;

 

void OscillatorConfiguration(void) //Oscillator initialise

{

OSCCON = 0x71;

}

 

void UartInit(void) //uart initialise

{

 

//BRG16 = 0; // tO DO

SPBRG = 12;

BRGH = 0; //data rate for sending

SYNC = 0; //asynchronous

SPEN = 1; //enable serial port pins

CREN = 1; //enable reception

SREN = 0; //no effect

TXIE = 0; //disable tx interrupts

RCIE = 0; //disable rx interrupts

TX9 = 0; //8-bit transmission

RX9 = 0; //8-bit reception

TXEN = 0; //reset transmitter

TXEN = 1; //enable the transmitter

}

 

void UartTxChar(unsigned char ch) //function to transmit character

{

//CLRWDT();

while(!TXIF);

TXREG = ch;

}

 

void UartTxString(unsigned char *str) //function to transmit string

{

while(*str != ‘’)

UartTxChar(*str++);

UartTxChar(13);

 

}

 

void serial_receive() //function to take the value from RCREG

{

while((RCIF == 0) && (d != 50000))

{

d++;

}

 

if(RCIF)

{

receive_byte = RCREG;

RCIF = 0;

}

else

{

receive_byte = ‘A’;

}

 

 

}

 

void receive() //function to store the received vale in array

{

unsigned char i;

 

d = 0;

for( i = 0; i < 9; i++)

{

serial_receive();

 

receive_array = receive_byte;

}

 

}

 

void main(void)

{

OscillatorConfiguration();

UartInit();

UartTxString((unsigned char*)”AT”);

 

receive();

 

UartTxString(receive_array); 

while(1);

}

[kha]

 

     Please help me out…

 

     Thanks in advance

[Author]

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