//-------------------------------------------
//头文件
//-------------------------------------------
#include<reg51.h>
#include<stdio.h>

typedef unsigned char uchar;
typedef unsigned char uint;
uchar   counter=0;

sbit  key1=P3^2;
sbit  key2=P3^3;
sbit  key3=P3^4;
sbit  key4=P3^5;
//-------------------------------------------
//延时子程序
//-------------------------------------------
void  delay(uint index)
{
  uint i,j;
  for(i=0;i<index;i++)
  {
     for(j=0;j<124;j++);  
  }  
}
//--------------------------------------------
//IO口初始化
//--------------------------------------------  
void Init_IO(void)
{
P1=0xff;
key1=1;
key2=1;
key3=1;
key4=1;
}
//--------------------------------------------
//定时器T0初始化，T1为波特率发生器
//--------------------------------------------
void Init_timer(void)
{
  TMOD=0x12;
  TH0=(65536-50000)/256;
  TL0=(65536-50000)%256;
  TH1=TL1=0xff;
  TR0=1;
  TR1=1;
  IT0=1;
  IT1=1;
}
//--------------------------------------------
//串口初始化
//--------------------------------------------
void Init_uart(void)
{
  SCON=0x50;
  PCON=0x80;
  TI=1;
}
//--------------------------------------------
//开启中断
//--------------------------------------------
void Init_INT(void)
{
  EA=1;
  ET0=1;
  ES=1;
}
//-----------------------------------------------
//判断哪一个按键被按下，实现对相应的LED灯的控制
//-----------------------------------------------
void Key_scan(void)
{
  if(!(key1))
      {
       delay(100);//按键消抖
         for(;;)
         {
          if(!(key1))
           {
              P1=0xfc;
              delay(50000);//延时
              P1=0xff;
              delay(50000);//延时
         }
          else break;
         }
      }
     if(!(key2))
      {
       delay(100);
         for(;;)
         {
          if(!(key2))
           {
             P1=0xf3;
              delay(50000);
              P1=0xff;
              delay(50000);
         }
          else break;
         }
      }
      if(!(key3))
      {
       delay(100);
         for(;;)
         {
          if(!(key3))
           {
             P1=0xcf;
              delay(50000);
              P1=0xff;
              delay(50000);
         }
          else break;
         }
      }
     if(!(key4))
      {
       delay(100);
         for(;;)
         {
          if(!(key4))
           {
             P1=0x3f;
              delay(50000);
              P1=0xff;
              delay(50000);
         }
          else break;
         }
      }
  }  
void main (void)
{
  //初始化
  Init_IO();
  Init_timer();
  Init_uart();
  Init_INT();

  while(1);
}
void LED_CONTROL(void) interrupt 1 using 0 //定时器0中断
{
  if(++counter==200)
   {
     Key_scan();
    }  
  TH0=(65536-50000)/256;//T0预置数重新装入
  TL0=(65536-50000)%256;
}
void SCI_INT(void)  interrupt 4  using 1
{
  //printf("HELLO WORLD！！\n");
}