1.c

控制数码管

#include <iom16v.h>
unsigned char LED[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
int delay(unsigned char x)
{
 unsigned char i,j;
 for(i=0;i<10;i++)
 for(j=0;j<x;j++);
}
int main(void)
{
 signed char key,q,shi,ge;
 q=0;
 DDRA=0xff;
 DDRB=0xff;
 DDRC=0xfc;
 SFIOR&=0xfb;
 PORTC=0X03;
 while(1)
 {
  key=PINC&0x03; 
  if(key!=0x03)
  {
   delay(5);
  }
  if(key!=0x03)
  {
   if(key==0x02)
   {
    do
	key=PINC&0x03;
	while(key==0x02);
    q+=1;
    if(q==60)q=0;
   }
   if(key==0x01)
   {
    do
	key=PINC&0x03;
	while(key==0x01);
    q-=1;
    if(q==-1)q=59;
    }
   }  
  shi=q/10;
  ge=q%10;
  
  
  PORTA=LED[ge];
  PORTB=0xfd;
  delay(10);
  PORTB=0xff;
  
  PORTA=LED[shi];
  PORTB=0xfe;
  delay(10);
  PORTB=0xff;
 }
}