51流水灯

#include <REGX52.H>
#include <INTRINS.H>//nop
void Delay1ms(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;
	while(xms)
	{
	_nop_();
	i = 2;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
	xms--;
}
}

void main()
{
	while(1)
	{
		P2=0xFE;//1111 1110
		Delay1ms(100);	
		P2=0xFD;//1111 1101
		Delay1ms(100);	
		P2=0xFB;//1111 1011
		Delay1ms(100);	
		P2=0xF7;//1111 0111
		Delay1ms(100);
		P2=0xEF;//1110 1111
		Delay1ms(100);
		P2=0xDF;//1101 1111
		Delay1ms(100);	
		P2=0xBF;//1011 1111
		Delay1ms(100);	
		P2=0x7F;//0111 1111
		Delay1ms(100);	
	}
}

#include <REGX52.H>
#include <INTRINS.H>//nop
void Delay500ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 4;
	j = 129;
	k = 119;
	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();
	}
}