#include "reg51.h"
#include "intrins.h"
#define uchar unsigned char
#define uint unsigned int
uchar Left(uchar temp);//申明函数头

//延时程序
void Delay(uint i)
  { uint j;
    for(;i>0;i--)
      { for(j=0;j<125;j++)
          {;}
      }
   }

void main()
  { uchar Lamp=0xfe;
      for(;;)
      {Lamp=Left(Lamp);
        P1=Lamp;
        Delay(1500); /*延时1000毫秒*/
      }
}