main._c

单片机中的中断处理模块

//ICC-AVR application builder : 2007-8-13 15:05:41
// Target : M128
// Crystal: 7.3728Mhz

#include <iom128v.h>
#include <macros.h>
#include "port.h"
#include "led.h"
#include "stdtypes.h"

UNS8 counter;
UNS8 num;

/*call this routine to initialize all peripherals */
void main(void)
{
  //stop errant interrupts until set up
 CLI(); //disable all interrupts
 XDIV  = 0x00; //xtal divider
 XMCRA = 0x00; //external memory
 port_init();
 led_init(); //7段数码管显示
 
 MCUCR = 0x00;
 EICRA = 0x00; //extended ext ints
 EICRB = 0x00; //extended ext ints
 EIMSK = 0x01;
 TIMSK = 0x00; //timer interrupt sources
 ETIMSK = 0x00; //extended timer interrupt sources
 
  counter=0;
  num=0;
  
 SEI(); //re-enable interrupts
 //all peripherals are now initialized

	 
for(;;)
  { 
   display(num,0); //普通模式，显示countdata的值，countdata将在timer3定时一秒溢出时改变
 //display(num,1);  //补零模式，显示countdata的值，countdata将在timer3定时一秒溢出时改变
  }
}

#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{

 //external interupt on INT0
 counter++;
 if(counter==0xFF)
 {
 counter=0;
 num++;
 if(num==0xFF)
 num=0;
 }
 
}