ledls.c

来自「很实用的单片机例程」· C语言 代码 · 共 27 行

#include<reg51.h>
#include <intrins.h>


void delayms(unsigned char ms)	
// 延时子程序
{						
	unsigned char i;
	while(ms--)
	{
		for(i = 0; i < 120; i++);
	}
}

main()
{
	unsigned char LED;
	LED = 0xfe;
	P3 = LED;
	
	while(1)
	{
		delayms(250);			
		LED = _crol_(LED,1);		//循环右移1位，点亮下一个LED
		P3 = LED;
	}
}