#include<reg52.h>
#include<intrins.h>
sbit KEY1=P2^0;
sbit KEY2=P2^1;
sbit KEY3=P2^2;
sbit KEY4=P2^3;
sbit BELL=P2^4;
sbit RED1=P1^0;
sbit YEL1=P1^1;
sbit GRE1=P1^2;
sbit RED2=P1^3;
sbit YEL2=P1^4;
sbit GRE2=P1^5;
sbit RED3=P1^6;
sbit YEL3=P1^7;
sbit GRE3=P3^0;
sbit RED4=P3^1;
sbit YEL4=P3^2;
sbit GRE4=P3^3;
#define uint unsigned int
void Delay(uint);
void Key();
void Bell(uint);
void main()
{
 while(1)
  Key();
}
void Key()
{
 if(KEY1==0 || KEY2==0 || KEY3==0 || KEY4==0) 
 {
  Delay(2);     //20??????????í????·??????
  if(KEY1 == 0)
  {
   RED1=0;
   RED2=0;
   RED3=0;
   RED4=0;
   Bell(10);
  }
  else if(KEY2 == 0)
  {   
   YEL1=0;
   YEL2=0;
   YEL3=0;
   YEL4=0;
   Bell(10);
  }
  else if(KEY3 == 0)
  {   
   GRE1=0;
   GRE2=0;
   GRE3=0;
   GRE4=0;
   Bell(10); 
  }
  else
  {
   RED1=0;
   RED2=0;
   RED3=0;
   RED4=0;
   YEL1=0;
   YEL2=0;
   YEL3=0;
   YEL4=0;
   GRE1=0;
   GRE2=0;
   GRE3=0;
   GRE4=0;
   Bell(10);
  }
  Delay(50);   //??????±0.5????????????????????????°????ü??????ì????
  RED1=1;
     RED2=1;
  RED3=1;
  RED4=1;
  YEL1=1;
  YEL2=1;
  YEL3=1;
  YEL4=1;
  GRE1=1;
  GRE2=1;
  GRE3=1;
  GRE4=1;
 }    
}
void Bell(uint a)
{
 uint b;
 for(b=100;b>0;b--)
 {
  BELL=0;
  Delay(a);
  BELL=1;
  Delay(a);
 }
}
void Delay(uint z)
{
 uint x,y;
 for(x=100;x>0;x--)
  for(y=z;y>0;y--);
}

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