/* filename ******** IR.C ************** 
   IR Remote and Interrupt Input Capture program for the MC68HC11 EVB   

   This example accompanies the book
     "Embedded Microcomputer Systems: Real Time Interfacing", Brooks-Cole, copyright (c) 2000,
      Jonathan W. Valvano 7/6/99

   Interface between the TExaS simulator running a MC68HC11 EVB
      with ICC11 freeware compiler 
   TExaS Copyright 1999 by Jonathan W. Valvano 
   for more information about ICC11 
      see http://www.imagecraft.com
   You may use this file without restrictions

   IR remote connected to both PA1, PA0
   Increments global variables
   count+1  falling edge on PA1/IC2
   count    rising edge on  PA0/IC3 */

#include "HC11.h"

#define IC2 0x02
#define IC3 0x01

unsigned char count[2];

/* interrupt on PA0/IC3, IR signal rising edge  */
void TIC3handler(void){
   TFLG1=IC3;  /* acknowledge interrupt */
   ++count[0]; /* count number of rising edges */
   PORTB=count[0];
asm(" rti");
}

/* interrupt on PA1/IC2, IR signal falling edge */
void TIC2handler(void){
   TFLG1=IC2;  /* acknowledge interrupt */
   ++count[1]; /* count number of falling edges */
   PORTC=count[1];
asm(" rti");
}

/***warning**** highest level interrupt program should be so simple
               it doesn't push things on the stack 
               this inconvenience is only for the freeware compiler 
PS if you need to make it more complex, call a function and
perform the complex operations in the function. e.g., see
the SCIhandler in the file SCI11a.c  */
void main(void){ 
   DDRC=0xFF;          /* PC7-PC0 outputs */
   TMSK1=IC2+IC3;  /* arm IC3 IC2 */
   count[1]=count[0]=0;
/*  00,10,01, falling on PA1/IC2, rising on PA0/IC3 */
   TCTL2=0x09;
   TFLG1=IC2+IC3;  /* initially clear IC2F IC3F flags */
asm(" cli");           /* enable interrupts */  
  while(1){}
}
		
void resetVectors(void){
/* not really a function, 
   but this must be last */
  asm(" org $FFEA");
  asm(" FDB _TIC3handler");
  asm(" FDB _TIC2handler");

  asm(" org $FFFE");
  asm(" FDB __start");
  asm(" org $FC00"); /* puts rts in a harmless place */
/* string constants also placed here */
/* the value FC00 means you can have up to 1000 characters of strings  */
}