use595_2.c

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#include  <AT89X52.H>
unsigned char code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
                          0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
unsigned char k;

void delay10ms(void)
  {
    unsigned char i,j;
	for(i=20;i>0;i--)
 	for(j=248;j>0;j--)
    ;
  }

void quzhi(void)
{unsigned char x,y,z;
 P2=0xff;
 P2=0x0f;
 if(P2!=0x0f)
  {
   delay10ms();
   if(P2!=0x0f)
	 {
      x=P2;
	 }
  }
 P2=0xf0;
 if(P2!=0xf0)
   {
     delay10ms();
	 if(P2!=0xf0)
	  {
       y=P2;
	  }
	}
  z=x^y;//z=x|y;
  switch(z)
   {
     case 0xee: k=0;break;
	 case 0xde: k=1;break;
	 case 0xbe: k=2;break;
	 case 0x7e: k=3;break;
	 case 0xed: k=4;break;
	 case 0xdd: k=5;break;
	 case 0xbd: k=6;break;
	 case 0x7d: k=7;break;
	 case 0xeb: k=8;break;
	 case 0xdb: k=9;break;
	 case 0xbb: k=10;break;
	 case 0x7b: k=11;break;
	 case 0xe7: k=12;break;
	 case 0xd7: k=13;break;
	 case 0xb7: k=14;break;
	 case 0x77: k=15;break;
	}
}

void  sdata(void)
   {
     unsigned char i;
	 for(i=0;i<8;i++)
	 {
	  P1_0=0;
	  P1_1=1;
	  P1_0=1;
	 }
	}

void out(void)
	 {
        P1_2=0;
		P1_2=1;
    }
void sdata1(void)
{
 unsigned char c,num;
 num=tab[k];
 for(c=0;c<8;c++)
 {
  P1_3=0;
  P1_4=num&0x80;
  num=num<<1;
  P1_3=1;
  }
}


void main(void)
{
 
 while(1)
 {
  quzhi();
  sdata();
  sdata1();
  delay10ms();
  out();
  
 }


}