/*******************************************************************************
  Title:  演示程序1 - LED流水灯                     				*
  Name:   ex01.c                                                          	*
  Date:   2005-5-5                                                             	*
  Ver:    1.0                                                                  	*                                                *
  web：   http://www.mcustudy.com                                               *
********************************************************************************
                                                                              	*
         延时实现LED流水灯效果                                                	*
                                                                              	*	
                                                                              	*
********************************************************************************/

#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;
	P0 = LED;
	
	while(1)
	{
		delayms(200);			
		LED = _crol_(LED,1);		//循环右移1位，点亮下一个LED
		P0 = LED;
	}
}