#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit ALE=P2^3;
sbit START=P2^4;
sbit OE=P2^5;
sbit EOC=P3^7;
sbit xs=P1^7;
sbit key1=P3^5;
sbit key2=P3^6;
uchar code disp[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar code wei[]={0xf1,0xf2,0xf4,0xf8};
uint data adder[8];
uint data dis[5];
uchar q=1,w=0,k,s;

void delay(uchar p)
{
 uchar i,j;
 for(i=0;i<p;i++)
 for(j=0;j<50;j++);
}
 
void key()
{
  if(key1==0)
  {
   delay(10);
   if(key1==0)
   {q=!q;while(key1==0);}
  }	
  if(q==0)
  {if(key2==0)
  {
   delay(10);
   if(key2==0)
   {w++;
    if(w==8){w=0;}while(key2==0); 
   }
  }
}  }

void display()
{
 uchar m,n=0x00;
 uchar h,l,u;
  for(m=0;m<8;m++)
   {
    if(q==1){l=m,u=200;}else {l=w;u=1;key();}
    dis[3]=l;
    dis[4]=adder[l]*100/51;
    dis[0]=dis[4]%10;
    dis[1]=dis[4]/10%10;
    dis[2]=dis[4]/100%10;
    for(h=0;h<u;h++)
    { 
     for(k=0;k<4;k++)
     {
      P3=wei[k];
      P1=disp[dis[k]];
	  if(k==2){xs=0;}
	  delay(1); 
     }
	 if(key1==0)goto key;
    }
   }  
   key:key();
}
  
 
void adc0809()
{
 uchar a;
 P2=0x00;
 for(a=0;a<8;a++)
 {
  ALE=1;_nop_();_nop_();ALE=0;
  START=1;_nop_();_nop_();START=0;
  _nop_();_nop_();_nop_();_nop_();
  while(EOC==0);
  OE=1;adder[a]=P0;OE=0;P2++; 
 }
}

 void main()
   {
    P0=0xff;
	P2=0x00;
	P1=0xff;
	P3=0xff;
	while(1)
	{
	 adc0809();
	 display();
	}
   }