gistfile1.txt

#include <18f4520.h>
#use delay(clock=20000000)
#fuses HS, NOWDT, NOLVP
#include "../Library/18f4520ptr.h"
#include "../Library/KeypadC1.h"
#include "../Library/modifiedlcd.h"

float Vres=5.0/1023.0;
float Voltage, Voltage1, VoltageP;
float Vmin=0;

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

//Compare
#INT_CCP1
void int_ccp1_isr(){
   *PORTC^= 0x01;
   *PORTC^=0X02;
   if (*PORTC & 0x01){
   *CCPR1=*CCPR1+(VoltageP*100);
   }
   else{
   *CCPR1= *CCPR1+((100-VoltageP)*100);
   }
}

main(){
   lcd_init();
   *TRISC=0x00;   // Port C output.
   T1CON->TMR1ON = 1;
   T1CON->TMR1CS=0;
   T1CON->T1CKPSx=0;  // Setting PS to 1
   CCP1CON->CCPxMx=8;   // Setup my Compare
   PIE1->CCP1IE=1;   // Setup my Interrupts
   INTCON->GIE=1;
   INTCON->PEIE=1;
   *CCPR1=0;

   ADCON0->ADON=1;   //Turn on A/D conversion
   ADCON0->CHSx=0;   //Turn Channel 0 A/D on
   ADCON1->PCFGx=0x0F;  //Set port A all channels to Digital
   *TRISA=0x0F;   // Port A, 4 LSB input
   *TRISB=0xF0;   // Port B, 4 LSB output, 4 MSB input.
   ADCON2->ADFM=1;
   // Enable References
   ADCON1->VCFG0=1;  // Enables -Voltage reference, used in A/D conversion. Allows usage of voltages lower then zero.
   ADCON1->VCFG1=1;  // Enables +Voltage reference, used in A/D Conversion.
   //A/D Interupet setup.
   PIE1->ADIE=1;  // Enables A/D external interupt.
   INTCON->GIE=1; // Because RCON->IPEN=0 INTCON->GIE=1 enables all unmasked intrrupts.
   INTCON->PEIE=1;   // Enables all unmasked peripherial interrupts.
   INTCON2->RBPU=0;  // PortB Pull up resistors are enabled

   while(1){
   VoltageP=Voltage1;
   Voltage1=((Voltage/5)*100);   // Converts voltage from pot to a % value.
   printf(lcd_putc,"\f %2.0f  %1.4f", Voltage1, Voltage);
   printf(lcd_putc,"\n %f", VoltageP);   //Print Pot voltage, print keypad value.
   ADCON0->GODONE=1;    //Go preform A/D conversion
   delay_ms(300);
   }
}