#include<reg52.h>
unsigned char count,scan,i;
void key1(void);
void key2(void);
void key3(void);
void key4(void);
//定義全局變量
void delay10ms(unsigned char time)
{
 unsigned int i;
 while(time--)
 {
   for(i=0;i<125;i++)
   {;}
   }

}

void main(void)
{ 
  
  while(1)
  { 
    scan=P0;
	 switch(scan)
	 { 
	 case 0xfe:key1();break;
	 case 0xf7:key2();break;
	 case 0x7f:key3();break;
	 case 0xdf:key4();break;
	 }
   }
}
 void key1(void)
 {   unsigned char temp=0xfe;
    for( i=0;i<8;i++)
	    {
		  	P1=temp;
			P2=temp;
         temp=(temp>>(8-1))|(temp<<1);
         delay10ms(100);
			}
}
void key2(void)
 { 
   unsigned char temp=0x7f;
    for(i=0;i<8;i++)
	    {
		   P1=temp;
		   P2=temp;
         temp=(temp<<(8-1))|(temp>>1);
		   delay10ms(100);
		  
			}
	 }
void key3(void)
 {
     unsigned char temp=0xfe;
  for (i=0;i<8;i++)
	    {
		   P1=temp;
			P2=temp;
			delay10ms(100);
         temp=(temp>>(8-2))|(temp<<2);
		
			
			}
	 }
void key4(void)
 {
   unsigned char  temp=0x7f;
    for( i=0;i<8;i++)
	    {
		   P1=temp;
			P2=temp;
			delay10ms(100);
		   temp=(temp<<(8-2))|(temp>>2);
		
			}
	 }