INTERFACING GSM MODULE

[Parth]

Hi, I m interfacing GSM Module with 89v51rd2 controller.

I want to work out this command “AT+CCLK?”. When I m sending this command from PC using hyperterminal by I am getting an error when I send this command from microcontroller. Please help, its urgent….

 

#include <REG51F.H>

#include “lcd.h”

 

char a[25];

int i;

 

void serial_init() 

{

    SCON=0x50;   //setup for 8-bit data

    TMOD=0x20;    //setup timer 1 for auto-reload

    TH1=0xfd; //Baud Rate 9600

    TR1=1;       //turn on timer 1

    TI=0;         //indicate ready to transmit

}

//This function displays a null-terminated string on the RS232 port

void send_serial(unsigned char *s)

{

    while(*s!=0x00)

    {

        SBUF=*s;

        while(!TI);

        TI=0;

        s++;

    }

}

 

void rec()

{

    i=0;

    while(SBUF!=’’ && i<16)

    {

         while(!RI);

         a= SBUF;

         ++i;

         RI=0;

    }

}

 

void main()

{

    serial_init();

    lcd(“receiving”);

    send_serial(“ATr”);

    delay(100);

    send_serial(“AT+CCLK?”);

    delay(10);

    send_serial(“r”);

    rec();

    delay(100);

    lcd(a);

    delay(1000);

}

 

[AJISH ALFRED]

Hi Parth,

The GSM modules usually don’t have the complete set of AT commands. Please go through the datasheet of the device and find out whether that particular command is available in the device or not.

[Author]

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