Problem in sending SMS through GSM module using 8051

Discussion in 'Embedded Systems and Microcontrollers' started by bobparihar, Apr 29, 2015.

  1. bobparihar

    Thread Starter Member

    Jul 31, 2014
    93
    0
    iam doing a project on sms sending through gsm
    using SIM 900 module and 8051
    My code is:

    #include<reg51.h>
    unsigned char *command = "AT";
    unsigned char *echo = "ATE0";
    unsigned char *msgConfig = "AT+CMGF=1";
    unsigned char *number = "AT+CMGS=\"8283******\"";
    unsigned char *message = "hello";
    unsigned char *CTRLZ = 0x1A;
    void serial_init(void);
    void serial(unsigned char);
    void puts(unsigned char *p );
    void delay(void);

    void main()
    {
    serial_init();
    puts(command);
    delay(); // delay of approx 1 sec
    puts(echo);
    delay();
    puts(msgConfig);
    delay();
    puts(number);
    delay();
    puts(message);
    delay();
    puts(CTRLZ);
    while(1);

    }
    void serial_init(void)
    {

    TMOD=0x20; //timer 1, mode 2(8-bit autoreload) to set baud rate
    TH1=0xFD; //-3 to TH1 for 9600 baud rate
    SCON=0x50; // 8 bit txion, 1 start 1 stop bit, REN enable for both txfr and rxve
    TR1=1; // start timer
    }

    void puts(char *p)
    {
    char *temp = p; /*temp pointer so that the actual pointer is not displaced */
    while(*temp != 0x00)
    {
    serial(*temp);
    temp++;
    }
    }

    void serial(unsigned char x)
    {

    SBUF=x;
    while(TI==0);
    TI=0;

    }
    void delay(void) // delay for approx 1 sec
    {
    int i;
    TMOD=0x01; // timer 0 in mode 1
    for(i=0;i<142;i++)
    {
    TL0=0x00; // starting value from 0
    TH0=0x00;
    TR0=1; // sart timer
    while(TF0==0); // polling TF flag for high
    TR0=0; // stop timer
    TF0=0; // clear flag TF0
    //}
    }
    }

    the problem here is SMS won't send by the GSM

    when i use the calling function by replacing the AT commands then calling works
    but SMS won't.. i think iam wrong in sending AT commands for SMS... please correct me
     
  2. bobparihar

    Thread Starter Member

    Jul 31, 2014
    93
    0
    i was expecting a lot.. :(
     
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