disp_0123.txt

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程序1
//disp_0123
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
unsigned char code ledk[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char mask,i;
sbit clk=P0^7;sbit sda=P0^6;
void delay(unsigned int n)
 {unsigned int i,j;
  for(i=0;i<n;i++)
     for(j=0;j<n;j++)  ;}
void shift(unsigned char dx)
{static unsigned char d;
   unsigned char j=0;
    d=dx;
   	while(j<8)
	{if((d&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   d<<=1;j++;}  }
void main(void)
{mask=0xfe;i=0; 
  while(1)
  { mask=_crol_(mask,1);if(mask==0xef)mask=0xfe;
   i++;if(i>3)i=0;
   shift(ledk[i]);P2=mask;delay(20);}
}