单片机入门：数码管滚动显示

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int

uchar code DSY_CODE[]=
{
   0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90
};

void DelayMS(uint x)
{
   uchar i;
  while(x--)
  {
     for(i=200;i>0;i--);
  }
}

void main()
{
   uchar i,k=0x80;
  while(1)
  {
     for(i=8;i>0;i--)
    {
       P2=0xff;
      k=_crol_(k,1);
      P0=DSY_CODE[8-i];
      P2=k;
      DelayMS(3);
    }
  }
}