gistfile1.txt

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

float Vres = 5.0 / 1023.0;
float Voltage;

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

//Frequency counter stetup
unsigned int OFCnt=0;
#INT_TIMER1    // Counter Overflows
void Int_timer1_isr(){
   OFCnt++;
}
//Frequency counter
unsigned int32 tstart, tstop, dT;
#INT_CCP2
void int_ccp2_isr(){
   tstop = *CCPR2;     //Get the time off the system
   dT = (OFCnt*0x10000)-tstart+tstop;
   tstart = tstop;
   OFCnt = 0;
}

BOOLEAN flag=0;
#INT_CCP1
void int_ccp1_isr(){
   *PORTC ^= 0x01;
   *CCPR1=*CCPR1+1250;
}

main(){
   float time; // Establish time variable
   lcd_init(); //inialize the LCD display
   ADCON0->ADON = 1; // Enable A/D Converter module
   ADCON0->CHSx = 0; // Channel 0
   ADCON1->PCFGx = 8;   //  Setting up which pins are A vs D input. 
   *TRISA = 0x01;     // A0 input
   ADCON2->ADFM = 1;  // RJ
   // Interrupt Setup
   PIE1->ADIE = 1;   // 
   INTCON->GIE = 1;  // Enable all unmasked interrupt
   INTCON->PEIE = 1; // Enables all unmaked peripheral interrupts
   // Setup Overflow
   T1CON->TMR1ON=1;  // Turn Timer1 on
   T1CON->T1CKPSx=0;  // Setting PS to 1
   // Setup my Interrupts
   PIE1->TMR1IE=1;    //  TMR1 overflow Interupt
   PIE2->CCP2IE=1;   //  CCP2 interrupt bit
   CCP2CON->CCPxMx=4;   // Setup Capture falling edge CCP2
   //PWM
   *TRISC=0x02;   // Port C output W/ Pin2 input. 
   PIE1->CCP1IE=1;   // Enables CCP 1 interrupt bit
   T1CON->RD16=1;    // Enables Read/Write in one 16 bit timer
   T1CON->T1RUN=1;   // Device clock is from T1 timer
   CCP1CON->CCPxMx=8;   // Setup Compare CCP1
   *CCPR1=0;
   *CCPR2=0;
   while(1){
      time=dT*0.2e-6; 
      printf(lcd_putc,"\f %fV", Voltage);
      printf(lcd_putc,"\n Freq=%f", 1/time);
      ADCON0->GODONE = 1;
      delay_ms(300);
   }
}