main.c

AVR mega16系列单片机开发程序

#include "config.h"

unsigned int i;
unsigned char flag;

#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{
  flag = 1;
}

void init_devices(void)
{
 CLI();                 //disable all interrupts
 MCUCR = 0x00;
 GICR  = 0x40;
 TIMSK = 0x00;         //timer interrupt sources
 SEI();                //re-enable interrupts
}

void main(void)
{  
  led_init();  
  init_devices(); 
  
   while(1)
     { 
	 if(flag==1)  
	   i++;
	  flag=0;	 
      delay_ms(1);
      display(i);           
     }
}