51单片机学习(1) LED点亮、闪烁以及流水灯实现

#include "reg51.h"    

sbit led=P2^0; 

void main()
{
	while(1)	
		{
			led=0; 
		}       
}

#include "reg51.h"    

unsigned int x;
sbit led=P2^0; 

void main()
{
	x=50000;
	while(1)	
		{
			led=0; //亮
			while(x--);  //延时
			led=1; //灭
			while(x--);	 //延时
		}       
}

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

uchar temp;
int x;

void main()
{
	x=50000;
	temp = 0x01;
	P1 = temp;
	while(x--);   //延时
	while(1)
	{
		temp = _crol_(temp,1);  //调用库函数
		P1=temp;
		while(x--);
	}
}

#include <reg51.h>

unsigned int x;
//shift to the left water lamp
void main()
{
	x=50000;
	P1=0x01;
	while(1)
	{
		while(x--);    //delay time
		P1=P1<<1;      //左移
		if(P1==0x00)
			P1=0x01;   //回到起始位置
	}
}

#include <reg51.h>

unsigned int x;
//shift to the right water lamp
void main()
{
	x=50000;
	P1=0x80;
	while(1)
	{
		while(x--);
		P1=P1>>1;
		if(P1==0x00)
			P1=0x80;
	}

}

#include <reg51.h>
#define uint unsigned int 
#define uchar unsigned char
	
uchar table[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uchar p;
int x;

void main()
{
	x=50000;
	while(1)
		{
		  for(p=0;p<8;p++)
		  {
		  	P1=table[p];
		   	while(x--);
		  }
		  for(p=6;p>=1;p--)
		  {
			P1=table[p];
			while(x--);
		  }
		}
}