51/52单片机实现流水灯、流水灯左右循环操作

如题，使用c语言编写程序实现流水灯和流水灯左右循环

流水灯实现有四种方法，下面一一展示。

// 方法1
#include <reg52.h>
#define led P2
typedef unsigned int u16;

void delay(u16 i)
{
	while(i--);
}

void main()
{
	while(1)
	{
		led = 0Xfe;
		delay(50000);
		led = 0xfd;
		delay(50000);
		led = 0xfb;
		delay(50000);
		led = 0xf7;
		delay(50000);
		led = 0xef;
		delay(50000);
		led = 0xdf;
		delay(50000);
		led = 0xbf;	
		delay(50000);
		led = 0x7f;
		delay(50000);
		
	}
}

// 方法2
#include <reg52.h>
#define led P2

typedef unsigned int u16;
typedef unsigned char u8;

void delay(u16 i)
{
	while(i--);
}

u8 code table[] = {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f};

void main()
{
	while(1)
	{
		u8 i;
		for(i=0; i<8; i++)
		{
			led = table[i];
			delay(50000);
		}
	}
}

// 方法3
#include "reg52.h"
sbit LED1=P2^0; 

#define LED_PORT P2 
typedef unsigned int u16; 
typedef unsigned char u8;

void delay_10us(u16 ten_us)
{
	while(ten_us--);
}

void main()
{
	u8 i=0;
	while(1)
	{
		for(i=0;i<8;i++)
		{
			LED_PORT=~(0x01<<i); //将 1 右移 i 位，然后取反将结果赋值到 LED_PORT
			delay_10us(50000);
		}
	}
}

// 方法4
#include "reg52.h"
#include "intrins.h"
#define LED_PORT P2 //使用宏定义P2端口
typedef unsigned int u16;
typedef unsigned char u8;

void delay_10us(u16 ten_us)
{
	while(ten_us--);
}
void main()
{
	u8 i=0;
	LED_PORT=~0x01;
	delay_10us(50000);
	while(1)
	{
		for(i=0;i<7;i++) //将 led 左移一位
		{
			LED_PORT=_crol_(LED_PORT,1);
			delay_10us(50000);
		}
	}
}

实现流水灯左右循环

其实和上面方法同理，这里使用了keil内置的位移库函数，左移是_crol_()，右移是_cror_()。

#include "reg52.h"
#include "intrins.h"
#define LED_PORT P2 //使用宏定义P2端口
typedef unsigned int u16;
typedef unsigned char u8;

void delay_10us(u16 ten_us)
{
	while(ten_us--);
}
void main()
{
	u8 i=0;
	LED_PORT=~0x01;
	delay_10us(50000);
	while(1)
	{
		for(i=0;i<7;i++) //将 led 左移一位
		{
			LED_PORT=_crol_(LED_PORT,1);
			delay_10us(50000);
		}
		for(i=0;i<7;i++) //将 led 右移一位
		{
			LED_PORT=_cror_(LED_PORT,1);
			delay_10us(50000);
		}
	}
}