LED流水灯

代码

#include <REGX52.H>
#include<intrins.h>

void Delay500ms()		//@12.000MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 4;
	j = 205;
	k = 187;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void main()
{
	while(1)
	{
		P2=0xFE; //1111 1110
		Delay500ms();
		P2=0xFD; //1111 1101
		Delay500ms();
		P2=0xFB; //1111 1011
		Delay500ms();
		P2=0xF7; //1111 0111
		Delay500ms();
		P2=0xEF; //1110 1111
		Delay500ms();
		P2=0xDF; //1101 1111
		Delay500ms();
		P2=0xBF; //1011 1111
		Delay500ms();
		P2=0x7F; //0111 1111
		Delay500ms();
	}
}

效果