gistfile1.txt

// Challenge 4 Microcontolers Fall 2015 Josh Held
#include <18f4520.h>
#use delay(clock=20000000)
#fuses HS, NOWDT, NOLVP
#include "../../Library/18f4520ptr.h"
#include "../../Library/modifiedlcd.h"
float incoming, outgoing, RPM;

#INT_RDA  // Interrupt for recieve data      Only for USART Receive interupt    Triggered by proper USART packet receive
void int_rda_isr(){
   incoming=*RCREG;
   *TXREG=RPM;
}
// RCREG = Data Receiver Register
// TXREG = Data Trasmit Register

//Frequency counter
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;
}

main(){
   float time;
   float x=50;
   float CRPM, TRPM;
   int y;

   lcd_init();
   ADCON1->PCFGx=0xF; // All Digital
   *TRISC=0x82;

   *TRISA=0x00;   // output toggle setup

   TXSTA->TXEN=1; // Tx On
   TXSTA->SYNC=0; // Asynch
   TXSTA->BRGH=0; // Low Speed
   RCSTA->SPEN=1; // Rx On          RCSTA is setting up two interupts.
   RCSTA->CREN=1; // Rx Cont. on
   BAUDCON->BRG16=1;       // Setting baud rate based off of table.
   *SPBRG=129; // setting the interupt
   PIE1->RCIE=1;  // Rx Interupt Enable
                  // If Tx Enable is ON it wont work.
   INTCON->GIE=1;
   INTCON->PEIE=1;
   // Setup Overflow
   T1CON->TMR1ON=1;
   T1CON->TMR1CS=0;
   T1CON->T1CKPSx=0;  // Setting PS to 1
   // Setup my Capture
   CCP2CON->CCPxMx=4;
   // Setup my Interrupts
   PIE1->TMR1IE=1;    // Overflow Interupt
   PIE2->CCP2IE=1;

   //PWM
   T2CON->TMR2ON=1;  // Problem line in challenge  //PWM has to use timer 2.
   CCP1CON->CCPxMx=0xC;

   //*CCPR1=x;

   *PR2=100;
   INTCON->GIE=1;
   INTCON->PEIE=1;
   INTCON->INT0IE=1;
   INTCON2->INTEDG0=1;


   while(1){
      //incoming=CurrentRPM;
      TRPM=(117*(incoming/100));
      CRPM=RPM;
      if((TRPM-1)>=CRPM){
         x=x+1;
      }
      else if ((TRPM+1)<=CRPM){
         x=x-1;
      }

      //float RPM;
      RPM=(1/((161*time)/60));
      time=dT*0.2e-6;      // PS 1 and Fosc 20m
      printf(lcd_putc, "\f%2.2f T%2.2f", incoming, TRPM);
      printf(lcd_putc,"\nRPM=%2.2f", RPM);
      //*CCPR1=incoming;    //working pwm driver
      *CCPR1=x;
      delay_ms(300);
   }
}