portj.c

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */
#include "pll.h"
#include "swled.h"
#include "segs.h"
#include "timer.h"

//Global Scope Variables
volatile counter = 0;

void main(void) {
  //Local Scope Variables
  unsigned int loopcount = 0; //Keep track of loops

  //Startup code
  PLL_To20MHz();
  TMR_Init(eTMR_Prescale_128,0,0,eTMR_Pin_Toggle);
  SWL_Init();
  SEG_Init();

  /******************************************************
   *  Set up J port (bits 0 and 1) as hardware interrupts 
   ******************************************************/
  //Set PJ0 and PJ1 as inputs
  DDRJ &= ~(DDRJ_DDRJ1_MASK | DDRJ_DDRJ0_MASK);
  //Set edges for PJ0 and PJ1
  PPSJ |= PPSJ_PPSJ1_MASK;   //rising edge, PRESS
  PPSJ &= ~PPSJ_PPSJ0_MASK;   //falling edge, RELEASE

  //Enable Interrupts for PJ1 and PJ0
  PIEJ |= PIEJ_PIEJ1_MASK | PIEJ_PIEJ0_MASK;

  //Everything is set up, so enable interrupts globally
	EnableInterrupts;

  //Throw the current count to top segs, for startup value
  SEG_16D(counter,0);

  for(;;) {
    //Let's just do a fast count on the bottom segs to show
    //that the program is running normally 
    //note that even with this long sleep, my interrupts work
    TMR_Sleep(1000);
    SEG_16D(loopcount++,1);

    _FEED_COP(); /* feeds the dog */
  } /* loop forever */
  /* please make sure that you never leave main */
}

/********************************************************************/
// Interrupt Service Routines
/********************************************************************/
interrupt VectorNumber_Vportj  void Vportj_ISR(void)
{
  if(PIFJ & PIFJ_PIFJ0_MASK)
  {//PJ0 was detected an edge
    PIFJ = PIFJ_PIFJ0_MASK; //clear flag; 
    if(++counter > 9999)
    {
      counter = 0;
    }
  }
  if(PIFJ & PIFJ_PIFJ1_MASK)
  {//PJ1 detected an edge
    PIFJ = PIFJ_PIFJ1_MASK; //clear flag;
    if(--counter < 0)
    {
      counter = 9999;
    }
  } 
  //Update top segs
  SEG_16D(counter, 0);
}