iar7-5.c

手把手教你学AVR单片机C程序设计实验程序

#include<iom16.h>
#include<intrinsics.h>
#define uchar unsigned char	
#define uint unsigned int
#define BZ_0  (PORTD=PORTD&0xdf)
#define BZ_1  (PORTD=PORTD|0x20)
uint cnt=0;
//*****************************	
void delay_ms(uint k)			
{
    uint i,j;
    for(i=0;i<k;i++)
    {
       for(j=0;j<1140;j++);
    }
}
//=============================
void main(void)		
{
DDRB=0xff;	
PORTB=0xff;	
DDRD=0xfb;	
PORTD=0xff;	
MCUCR=0x60;
GICR=0x40;
SREG=0x80;
BZ_1;
PORTB=0xf0;delay_ms(1000);
PORTB=0x0f;delay_ms(1000);
PORTB=0xff; 
   while(1)		
   {
     delay_ms(10);
     __sleep();      
     do
     {
       BZ_0;delay_ms(1);
       BZ_1;delay_ms(1);
       cnt--;
     }
     while(cnt!=0);
     PORTB=0xff;
   }			
}		
//*****************************
#pragma vector=INT0_vect
__interrupt void int1_isr(void)
{
 cnt=5000;
 PORTB=0x00; 
}