SR-87 GPS Module

April 2, 2013 Coded in C for the Microchip PIC16

This a driver file to interfce SR-87 GPS module with PIC microcontroller(Compiled in CCS PICC)

#use rs232(baud=4800,xmit=PIN_C6,rcv=PIN_C7,bits=8,stop=1,parity=n,stream=GPS,force_sw)

#include<string.h>
#include<stdlib.h>
//char latitude[17],longitude[17],buffer[17];

// Read the lattitude and longitude
void get_position()
{
	int8 rx_count,rx_buffer;
	rx_count=0;
	strcpy(buffer,"GPRMC");
	do
	{
		rx_count=0;
		output_low(PIN_A5);
		while(fgetc(GPS) !='$');
		while((rx_buffer=fgetc(GPS))!=',')
		{
			latitude[rx_count]=rx_buffer;
			rx_count++;
		}
		latitude[rx_count]='\0';
	}while(strcmp(latitude,buffer));
//*****************************************************************
	while(getc(GPS)!=',');
	while(getc(GPS)!=',');
	rx_count=0;
	do
	{
		rx_buffer=fgetc(GPS);
		latitude[rx_count]=rx_buffer;
		rx_count++;
	}while(rx_buffer!=',');
	latitude[rx_count]=fgetc(GPS);
	rx_count++;
	latitude[rx_count]='\0';
	rx_buffer=fgetc(GPS);
	rx_count=0;
	do
	{
		rx_buffer=fgetc(GPS);
		longitude[rx_count]=rx_buffer;
		rx_count++;
	}while(rx_buffer!=',');
	longitude[rx_count]=fgetc(GPS);
	rx_count++;
	longitude[rx_count]='\0';

}	
//wait untill a valid data
void get_fix()
{
   int8 rx_count,rx_buffer;
   rx_count=0;
   strcpy(buffer,"GPRMC");
   do
   {
      do
      {
         rx_count=0;
         while(fgetc(GPS) !='$');
         while((rx_buffer=fgetc(GPS))!=',')
         {
            latitude[rx_count]=rx_buffer;
            rx_count++;
         }
         latitude[rx_count]='\0';
      }while(strcmp(latitude,buffer));
      
      while(fgetc(GPS) !=',');
      rx_buffer=fgetc(GPS);
   }while(rx_buffer !='A');   
   

}

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