C51的8个IO流水灯

#include <reg51.h>
#include <intrins.h>
#define uchar unsigned char

void delay()
{
	int i, j;
	for(i = 0; i < 255; i++)
	{
		for(j = 0; j < 255; j++);
	}
}

void show1()//移位
{
	uchar a = 0x01;//0000 0001
	while(1)
	{
		P0 = a;
		delay();
		a <<= 1;//左移一位
		if(a == 0)
		{
			a = 0x01;
		}
	}
}

void show2()//库函数
{
	uchar a = 0x01;//0000 0001
	while(1)
	{
		P0 = a;
		delay();
		a=_crol_(a,1);//左移一位，移除的数据会自动循环到右边
	}
}

void main()
{
	//show1();
	show2();
}