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;
float Voltage1;
float Vmin=0;

//Frequency counter
unsigned int OFCnt=0;
#INT_TIMER1    // Counter Overflows
void Int_timer1_isr(){
   OFCnt++;
}

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;
}

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

main(){
   float RPM, time;
   int16 press1, press2;
   lcd_init();

   //PWM
   *TRISC=0x02;
   CCP1CON->CCPxMx=0xC;
   T2CON->TMR2ON=1;
   *PR2=100;   //PR2 is the period driver.

   //Frequeny counter
   T1CON->TMR1ON=1;
   T1CON->TMR1CS=0;
   T1CON->T1CKPSx=0;  // Setting PS to 1
   CCP2CON->CCPxMx=4;   // Capture Falling edge
   PIE1->TMR1IE=1;    // Overflow Interupt
   PIE2->CCP2IE=1;
   INTCON->GIE=1;
   INTCON->PEIE=1;

   //A/D Conversion
   ADCON0->ADON = 1;
   ADCON0->CHSx = 0;
   ADCON1->PCFGx = 8;
   *TRISA = 0x01;     // A0 input
   ADCON2->ADFM = 1;  // RJ
    // Interrupt Setup
   PIE1->ADIE = 1;
   INTCON->GIE = 1;
   INTCON->PEIE = 1;
   INTCON2->RBPU=0;  // PortB Pull up resistors are enabled

   while(1){
      Voltage1=((Voltage/5)*100);
      time=dT*0.2e-6;      // PS 1 and Fosc 20m
      printf(lcd_putc,"\fRPM=%f", (1/((161*time)/60)) );   // Prints and calculates RPM speed.
      printf(lcd_putc,"\n%2.2FV Percent=%2.0f", Voltage, Voltage1);
      *CCPR1=Voltage1;     // Controling the Duty Cycle
      delay_ms(300);
      ADCON0->GODONE=1;

   }
}