gistfile1.txt

#include <18f4520.h>
#use delay(clock=20000000)
#fuses HS, NOWDT, NOLVP
#include "../Library/18f4520ptr.h"
#include "../Library/modifiedlcd.h"

float Vres=6.0/1023.0;
float Voltage;
float Vmin=3;

#INT_AD
void int_ad_isr(){
   Voltage=*Q*Vres-Vmin;
}

main(){
   lcd_init();
   ADCON0->ADON=1;
   ADCON0->CHSx=0;
   ADCON1->PCFGx=8;
   *TRISA=0x0F;      // A0 input
   ADCON2->ADFM=1;   //RJ
   //Enable References
   ADCON1->VCFG0=1;
   ADCON1->VCFG1=1;
   //Interupt Setup
   PIE1->ADIE=1;
   INTCON->GIE=1;
   INTCON->PEIE=1;
   while(1){
      printf(lcd_putc,"\f %FV", Voltage);
      delay_ms(300);
      ADCON0->GODONE=1;    //Go
   }
}