Problem in program while interfacing with pic16f877a and gps (634r) skytraq

[pradeep]

our motive is to receive longitude and latitude from the gps ($GPGGA) and store them in an array of microcontroller 16f877a..

 

 

I used LED in ports to find whether tthe data is received or not.

 

because i do not have lcd to c the output of gps….. bt i c them in PUTTY software…

 

i can see indication that i receive $ sign

 

the program does not  work further r no other indication seen….

 

 

Tell if any mistake is there in our program and try to correct it  and help me out..

 

(our program is given below)::: [program written in HIGH TECH C COMPILER]…..

 

 

#include<pic.h>

#include<string.h>

__CONFIG( HS & WDTDIS & BOREN & LVPDIS );

 

static bit OO@((unsigned )&PORTB*8+1);

static bit KK@((unsigned )&PORTB*8+2);

static bit EE@((unsigned )&PORTB*8+3);

static bit II@((unsigned )&PORTB*8+7);

void delay(unsigned int y)//delay prg

{

while(y–);

}

 

unsigned char a=0,data;

 unsigned char lat[15],lon[15],i,j,ch,gps[10];

 

unsigned char UART_Getc()

{

    while(RCIF == 0);              

    return RCREG;

}

 

 

 void interrupt ISR(void) 

 { 

      if(RCIF == 1) 

     { 

 

 

data=UART_Getc();

RCIF==0;

}

     } 

 

void GPS_Status()

{

 // delay(100);

    

        do

        {

    }while(data != ‘$’);

OO=1;     //this LED GLOWS WHEN I switch on GPS  i.e we receive $ sign

 

i = 0;

 do

        {

            gps[i++] =data;

        }while(gps[i-1] != ‘,’);

            gps[i-1] = 0;

 

 

 if(strcmp(“GPGGA”,gps) == 0)

        {

 

KK=1;

 

 

 

 do

            {

                ch =data;

            }while(ch != ‘,’);

    

            i = 0;

EE=1;

            for(j=0;j<2;j++)

            {

                do

                {

                    lat[i++] =data;

                }while(lat[i-1] != ‘,’);

            }

                lat[i-1] = 0;

 

            i = 0;

    

            for(j=0;j<2;j++)

            {

                do

                {

                    lon[i++] =data;

                }while(lon[i-1] = ‘,’);

            }

 

                lon[i-1] = 0;

 

 

}

 

}

void main()

{

TRISC=0XFF;

TRISB=0X00;

TXSTA=0X24;

RCSTA=0X90;

PORTB=0X00;

 

SPBRG=25;

BRGH=1;

GIE=1;

PEIE=1;

RCIE=1;

TRISD=0X00;

 

while(1)

{

 

GPS_Status();

 

delay(10000);

 

while(1);

}

}

 

 

 

 

 

 

 

 

 

 

 

 

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