[嵌入式]51单片机 LED流水灯

使用位定义实现LED流水灯

#include <reg52.h>
#define time 20000
sbit LED1=P2^0;
sbit LED2=P2^1;
sbit LED3=P2^2;
sbit LED4=P2^3;
sbit LED5=P2^4;
sbit LED6=P2^5;
sbit LED7=P2^6;
sbit LED8=P2^7;

void delay(unsigned int i)	
{
	while(i--);
}

void main()
{
	while(1)
	{
	  LED8=1;
	  LED1=0;
	  delay(time);
	  LED1=1;
	  LED2=0;
	  delay(time);
	  LED2=1;
  	  LED3=0;
	  delay(time);
	  LED3=1;
	  LED4=0;
	  delay(time);
	  LED4=1;
  	  LED5=0;
  	  delay(time);
	  LED5=1;
	  LED6=0;
	  delay(time);
	  LED6=1;
	  LED7=0;
  	  delay(time);
	  LED7=1;
      LED8=0;
	  delay(time);
  }
}

使用P2口实现LED流水灯

#include <reg52.h>
#define time 20000

void delay(unsigned int i)	
{
	while(i--);
}

void main()
{
	while(1)
	{
	  P2=0xfe;
		delay(time);
		P2=0xfd;
		delay(time);
		P2=0xfb;
		delay(time);
		P2=0xf7;
		delay(time);
		P2=0xef;
		delay(time);
		P2=0xdf;
		delay(time);
		P2=0xbf;
		delay(time);
		P2=0x7f;
		delay(time);
  }
}

使用数组实现LED流水灯

#include <reg52.h>
#define time 20000
unsigned char code led[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

void delay(unsigned int i)
{
	while(i--);
}

void main()
{
	int i;
	while(1)
	{
	  for(i=0;i<8;i++)
		{
			P2=led[i];
			delay(time);
		}
	}
}	

使用按位左移实现LED流水灯

#include <reg52.h>
#define time 20000

void delay(unsigned int i)	
{
	while(i--);
}

void main()
{
	int i;
	while(1)
	{
		for(i=0;i<8;i++)
		{
	    P2=~(0x01<<i);
		  delay(time);
		}
  }
}

使用左移函数实现LED流水灯

#include <reg52.h>
#include <intrins.h>
#define time 20000

void delay(unsigned int i)	
{
	while(i--);
}

void main()
{
	P2=0xfe;
	while(1)
	{
		delay(time);
	  P2=_crol_(P2,1);
  }
}