tools.c

Visuabaic interface with com connect to computer

// This file has been prepared for Doxygen automatic documentation generation.
/*! \file ********************************************************************
*
* Atmel Corporation
*
* - File              : AVRSMS_tools.c
* - Compiler          : IAR EWAAVR 4.11a
*
* - Support mail      : [e-mail]
*
* - Supported devices : All devices with a UART/USART can be used.
*                       The example is written for ATmega128
*
* - AppNote           : AVR323 - Interfacing GSM modems
*
* - Description       : Example of how to use AT-Commands to control a GSM modem
*
* $Revision: 1.1 $
* $Date: Tuesday, November 08, 2005 12:26:20 UTC $
*****************************************************************************/

//Include
#include"UART.h"
#include"ZIP.h"
#include"TOOLS.h"


/*! \brief Used to get index of newly received message
 *
 *  Will search through the receive buffer found in AVRSMS_com.c, until a \n
 *  ',' is found. If this charcter is found in the buffer, the next parameter will \n
 *  be the new message index.
 *
 *  \param    void
 *
 *  \retval   i index of new message
 *  \retval   0 Error with echo off
 */
int TOOLS_decodeCMTI( void )
{

    //! Local variables
    unsigned char *temp;
    int length, i;

    //init
    length = 0;

    length = COM_trim( );                                     //Trim off trailing OK\r\n
    temp   = COM_gets( );                                     //Get rx_buff

    for( i = 0; ( i < length ) && ( *temp++ != ',' ); i++)    //Loop until we get a ','
    {
        ;
    }

    //Error
    if( i >= length )
    {
        return 0;
    }

    else
    {
        return ZIP_atoi( temp );                             //Convert ascii int to integer
    }
}


/*! \brief Get start of compressed string
 *
 *  When a new message has been read from a given index, thsi function\n
 *  will run through it, and find start of the encoded user text.
 *
 *  \param    void
 *
 *  \retval   in_handle if error in_handle points to '\0', else it will point to the string ready for decompression
 *
 */
unsigned char* TOOLS__decodeCMGR( int index )
{

    //! Local variables
    unsigned char *in_handle;
    int i, len, field_length;

    len         = COM_trim();                                   //Trim off OK\r\n
    in_handle   = COM_gets( );                                  //Get rx_buff

    in_handle += 2;                                             //Skip first \r\n

    for( i = 0; ( i < len ) && ( *in_handle++ != '\n' ); i++)   //Loop until we get '\n'
    {
        ;
    }

    //Error
    if( i >= len )
    {
        in_handle = '\0';
        return in_handle;
    }

    //Everything OK
    else
    {

        field_length = 16 * ZIP_htoi( *in_handle++ );
        field_length = ZIP_htoi( *in_handle++ );

        in_handle += 2*field_length + 2;                        //Skip Service center nmbr

        //Find length of sender address
        field_length = 16 * ZIP_htoi( *in_handle++ );
        field_length = ZIP_htoi( *in_handle++ );

        if( field_length%2 )
        {
            field_length++;                                     //Check for trailing F
        }

        in_handle += 2 + field_length;                          //Skip fields in header

        in_handle += 14 + 4;                                    //Skip more fields...TP-PID, TP-DCS and TP-SCTS

        return ( in_handle + 2 );                               //Return correct pointer
    }
}