51单片机学习札记:写了个led宏,并尝试控制led灯的亮度

经常用led灯来观察现象,甚至调试代码,修改代码时用0和1很不方便,而且阅读性也不好,

故写了个宏,用起来方便些.

今天尝试控制灯的亮度. 先试试for循环控制,占空比调节...

//#include "my51.h"#include <reg52.h>typedef unsigned char  u8;typedef unsigned short int u16;#ifndef _51LED_#define _51LED_#define led 	  P1      			 //P1总线连8个led灯,灯连573锁存器,P1置低电平点亮#define LED		  led#define ON(x)     P1&(~(1<<(x)))	 //打开某个灯,开多个灯用 ON(m) & ON(n)#define OFF(x)    P1|(1<<(x))	 	 //关闭某个灯,关多个灯用 OFF(m)| OFF(n)#define on(x)	  ON(x)				 //包含大小写#define off(x)	  OFF(x)#define ledon     0					 //某个灯,打开#define ledoff    1					 //某个灯,关闭sbit led0=P1^0;     sbit led1=P1^1;sbit led2=P1^2;sbit led3=P1^3;sbit led4=P1^4;sbit led5=P1^5;sbit led6=P1^6;sbit led7=P1^7;	sbit ledLock=P2^5;	//锁定当前8个led的状态,0锁定 ,1不锁定#endifvoid ledCtr(u8 ledX,u8 per)		//参数1是某个灯,参数2是亮度{	u8 i=1;	for(i=1;i<=100;i++)	{		if(i<per)		{			led=on(ledX) ;		//打开灯		}		else		{			led=off(ledX);		//关闭灯		}	}}void delayms(u16 ms)     		//毫秒级软延时函数{		u16 i,j;	for(i=ms;i>0;i--)	{        for(j=113;j>0;j--)        {}	}}void main()				    //测试{	led6=ledon;		    	//打开6号灯,亮度100%	led=on(0);				//打开0号灯,亮度100%	led=on(1) & on(5);  	//打开1号和5号灯,亮度100% 	delayms(2000);	led0=ledoff;			 //关闭0号灯	led=off(6)|off(1)|off(5);//关闭1,5,6号灯	while(1)	{			  	ledCtr(2,5);    	 //仅打开2号灯,亮度5%, 省电...	}}

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