rf sistemlerle ilgili yardım

#include <16F877.h>
#device adc=8

#FUSES NOWDT                     //No Watch Dog Timer
#FUSES XT                        //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES NOPUT                     //No Power Up Timer
#FUSES NOPROTECT                 //Code not protected from reading
#FUSES NOBROWNOUT                //No brownout reset
#FUSES NOLVP                     //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                     //No EE protection
#FUSES NOWRT                     //Program memory not write protected
#FUSES NODEBUG                   //No Debug mode for ICD

#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#include "C:\Users\ST\Desktop\CCS denemeler\yeni2\main.h"
#include <LCD.C>

#use fast_io(b)
#use fast_io(c)
#use fast_io(d)

int sayac,i;
float hiz;

void uyandir()
{
printf("0x55");
printf("0x55");
printf("0x55");
printf("0x55");
printf("0x55");

putc('x');
}
void gonder()
{
uyandir();
putc(hiz);

}
#int_ext
void ext_kesmesi()
{
sayac++;
}

#int_timer0
void timer0_kesme()
{
set_timer0(60);
i++;

if(i==20){
hiz=sayac;
sayac=0;
i=0;
printf(lcd_putc,"\f HIZ=%f KM/H" ,hiz);
gonder();
}

clear_interrupt(int_timer0);
}



void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   lcd_init();
   enable_interrupts(INT_EXT);
   enable_interrupts(INT_TIMER0);
   enable_interrupts(GLOBAL);

while(1);

}

alıcı

#include <16F877.h>
#device adc=8

#FUSES NOWDT                     //No Watch Dog Timer
#FUSES XT                        //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES NOPUT                     //No Power Up Timer
#FUSES NOPROTECT                 //Code not protected from reading
#FUSES NOBROWNOUT                //No brownout reset
#FUSES NOLVP                     //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                     //No EE protection
#FUSES NOWRT                     //Program memory not write protected
#FUSES NODEBUG                   //No Debug mode for ICD

#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)


#include <LCD.C>
#use fast_io(d)
#use fast_io(b)
#use fast_io(c)

int gelen;
float hiz;


void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   lcd_init();

   while(1)
{


if(getc()=='x') //öncü veriyi aldıysan
{
gelen=getc(); //gönderdiğim veriyi al
hiz=gelen;
printf(lcd_putc,"\f HIZ=%f KM/H" ,hiz);

}
}

   

}