iar6-4.c

手把手教你学AVR单片机C程序设计实验程序

#include<iom16.h>			
#define uchar unsigned char	
#define uint unsigned int
//=============================
void delay_ms(uint k)			
{
    uint i,j;
    for(i=0;i<k;i++)
    {
       for(j=0;j<1140;j++);
    }
}
//=============================
void main(void)		
{					
char counter=0;	
DDRB=0xff;		
DDRD=0x00;		
PORTB=0xff;		
PORTD=0xff;	
   while(1)		
   {				
   	if((PIND&0x10)==0)	
	{
          if(++counter>8)counter=1;
          delay_ms(300);
        }		
	if((PIND&0x20)==0)		
	{
          if(--counter<1)counter=8;
          delay_ms(300);
        }		
   		   switch (counter)	
   		   {					
		   case 1:PORTB=0xfe;break;	
   		   case 2:PORTB=0xfd;break;
                   case 3:PORTB=0xfb;break;
                   case 4:PORTB=0xf7;break;
                   case 5:PORTB=0xef;break;
                   case 6:PORTB=0xdf;break;
                   case 7:PORTB=0xbf;break;
                   case 8:PORTB=0x7f;break;	
   		   default: break;	
   		   }
   }
}