按键.c

AVR单片机

#include<iom16v.h>
#include<macros.h>
void main()
{  unsigned char i;
   DDRD=0XFF;
   DDRC=0X00;
   PORTC=0XFF;
   while(1)
   {i=PINC|0xF0;
   switch(i)
   {  case  0xfe:
            PORTD=0X01;
			break;
	  case  0xfd:
	        PORTD=0X02;
			break;
	  case  0xfb:
	        PORTD=0X04;
			break;
	  case 0xf7:
	       PORTD=0X08;
		   break;
	 default:
	       PORTD=0X00;
		   break;
   }
   }
   
  

 }