Extracting data from gps

GPS/GNSS Development Boards
1

I want to extract RMC RMB and GGA sentences from GPS using PIC16F877.But i am unable to recieve data using serial interrupt.GPS is working properly.

here is the CCS code.

#include <lcd.h>
#include <420_lcdd.c>

#use rs232(baud=4800, xmit=PIN_C6, rcv=PIN_C7, stream=GPS)
unsigned int index=0;
unsigned char c;
unsigned char inStr[80] ;

 #INT_RDA
 void gps_isr(void)
  {
   c =fgetc(GPS);
   c = (char)c;

   if(c=='

)

  index=0;
  inStr[index]=c;
  index++;
  if((c==10)||(c==13))
  {
   inStr[index]='\0';
   index=0;
  }

}
void main()
{
lcd_init();
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
printf(lcd_putc,“%s”,inStr);
WHILE(TRUE)
{

}

}

2 
#include <lcd.h> 
#include <420_lcdd.c> 

#use rs232(baud=4800, xmit=PIN_C6, rcv=PIN_C7, stream=GPS) 
unsigned int index=0; 
char c; 
char inStr[2][80]; 
unsigned char sbuf=0; 
unsigned char last_sbuf=0; 

#INT_RDA 
void gps_isr(void) 
{ 
	c = fgetc(GPS); 

	if(c=='

)
index=0;

if(c=='\r' || c=='\n') 
{ 
	inStr[sbuf&1][index]='\0'; 
	index=0; 
	++sbuf; 
} else if(index<79) 
	inStr[sbuf&1][index++]=c;

}

void main()
{
lcd_init();
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
while(TRUE)
{
while(sbuf!=last_sbuf) {
printf(lcd_putc,“%s\n”,inStr[last_sbuf&1]);
++last_sbuf;
}
}
}

3

Thnx… but nothing is displayed on the lcd. and the array inStr [2][80] takes toooo much RAM.