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You are here: Home / Topics / Interfacing pic 16f688 with TELIT gprs modem

Interfacing pic 16f688 with TELIT gprs modem

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Microcontroller › PIC › Interfacing pic 16f688 with TELIT gprs modem

  • This topic has 1 reply, 1 voice, and was last updated 13 years, 8 months ago by kha.
Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
    Posts
  • November 10, 2011 at 4:20 am #1389
    kha
    Participant

     

    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);
    }
    November 10, 2011 at 11:34 am #6831
    kha
    Participant

     

         Please help me out…

     

         Thanks in advance

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