数码管演示.c

51单片机开发板提供的参考程序

/*copyright 2007,ShangHai  HaoTun Electronic Technology co.,Ltd
 *
 *This sample is used for 7-seg led dynamic display .
 *
 *write by Shifang 2007-4-23
 *
 *V1.1
 */

#include <reg52.h>

unsigned char const dofly[]={0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80};// 显示数值表 12345678
                                                                      //8位数码管显示12345678
unsigned char code seg[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};//分别对应相应的数码管点亮
////////////////////////////////////////////////////////
void delay(unsigned int cnt)
{
 while(--cnt);
}
///////////////////////////////////////////////////////
main()
{
 unsigned char i;

 while(1)
      {
 
       P0=dofly[i];//取显示数据
	   P2=seg[i];  //取段码
	   delay(30000); //扫描间隙延时,这个时间比较长，用于演示动态扫描
	                 //缩短这个时间，利用人眼的暂留效应我们就可以看到
					 //类似静态的显示了
           
	   i++;
	   if(8==i)
	     i=0;
      }
}