Micro Lab 10

#include <hidef.h> /* common defines and macros */
#include <mc9s12dg256.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"
#include "main_asm.h" /* interface to the assembly module */
#define oneSecond 97
#define twoSeconds 194
#define halfSecond 48
#define taskOne 1
#define taskTwo 2
#define taskThree 3
#define taskFour 4
#define loopTask 5
#define reset 0
#define forever 1
#define LEDOn 1
#define toggle 0x01
#define shortDelay 25
unsigned short ticks = reset ;
int task = taskOne;

/*
Ticks is how we are setting the ON/OFF duration
Each tick, we increment and wait until a value
Corresponding with the length of time we want is reached
Then we XOR the port and reset the ticks
*/

void interrupt 7 handler() {
      ticks++;
      if(task == taskOne){
                if(ticks >= halfSecond){
                          PORTB = PORTB^toggle;
                          ticks = reset;
                 }
                   clear_RTI_flag();
      }

      if(task == taskTwo){
                if(ticks == oneSecond){
                          PORTB = PORTB^toggle;
                          ticks = reset;
                 }
                   clear_RTI_flag();
      }


      if(task == taskThree){
                if(ticks == twoSeconds){
                            PORTB = PORTB^toggle;
                            ticks = reset;
                }
                clear_RTI_flag();
      }
}

/*
When a button is pressed, we move to the next task
The tasks are cycled in order (one,two,three,four)
And when the last task is completed, the next task
Will be taskOne again (one, two, three, four, one,..)
Special Case: If taskFour, disable IRQ and turn off LED
*/

void interrupt 6 handler1() {
      task++;
      if(task == loopTask){
        task = taskOne;
        RTI_enable();
        PORTB = LEDOn;
      }

      if(task == taskFour){
        RTI_disable();
        PORTB = reset;
      }

      /*
      Debounce
      */
      ms_delay(shortDelay);
      while(SW5_down()) {
      };
      ms_delay(shortDelay);

 }

/*
In our main, we are simply allowing our interupts and configuring the LED
of interest for output
*/

void main(void)
{
      PLL_init(); // set system clock frequency to 24 MHz
      seg7_disable();
      led_enable();
      _asm(cli); //enable interrupts

      RTI_init();
      IRQ_enable();

      while(forever) {
      };
}