interrupts.c

/******************************************************************************/
/*Files to Include                                                            */
/******************************************************************************/

#if defined(__XC)
    #include <xc.h>
#elif defined(HI_TECH_C)
    #include <htc.h>
#endif

#include <stdint.h>
#include <stdbool.h>

#include "delay.h"
#include "user.h"

unsigned short int ITERATION_SCALING_VALUE = 64; //yields 1024 to 0 iterations

/******************************************************************************/
/* Interrupt Routines                                                         */
/******************************************************************************/

#ifndef _PIC12

void interrupt isr(void)
{
    //if it's the AD interrupt
    if(ADIF==1)
    {
        //delay for some number of NOPs
        doDelay( (((unsigned short int)ADRESH)<<8) + ((unsigned short int)ADRESL) );

        //reset AD int flag
        ADIF = 0;
    }
}
#endif

void doDelay(unsigned short int ANALOG_VALUE)
{
    unsigned short int GARBAGE_VAL = 0;
    unsigned char TEMP;

    //0 to 65536 value range for unsigned 16 bit int, scalingValue of 64 yields 1024 to 0 iterations
    unsigned short int SCALED_ITERATIONS = ANALOG_VALUE/ITERATION_SCALING_VALUE;

    //iteration period proportional to analog value
    while(GARBAGE_VAL<SCALED_ITERATIONS)
    {
        GARBAGE_VAL++; //to make sure we don't optimize NOPs into nothingness
    }

    if(RB0==0)//toggle PORTB on
    {
        PORTB = TEMP = 0xFF; //make sure PORTB has time to process the change
    }
    else //toggle PORTB off
    {
        PORTB = TEMP = 0x00; //make sure PORTB has time to process the change
    }

    INTF=0; //unset INTF if set
}