动态扫描.c

来自「单片机c语言 用于DY500或同类型的开发板」· C语言 代码 · 共 35 行

/*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[]={0xf9,0xb0,0x92,0x80,0xf9,0xb0,0x92,0x80};// code table 13581358
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[7-i];  //取段码
	   delay(200); //扫描间隙延时
	   i++;
	   if(8==i)    //检测8位扫描完全？
	     i=0;
      }
}