經(jīng)常用led燈來(lái)觀察現(xiàn)象,甚至調(diào)試代碼,修改代碼時(shí)用0和1很不方便,而且閱讀性也不好,利用個(gè)宏,用起來(lái)方便些。

今天嘗試控制燈的亮度. 先試試for循環(huán)控制,占空比調(diào)節(jié)...

c代碼

//#include "my51.h"

#include

typedef unsigned char u8;

typedef unsigned short int u16;

#ifndef _51LED_

#define _51LED_

#define led P1 //P1總線連8個(gè)led燈,燈連573鎖存器,P1置低電平點(diǎn)亮

#define LED led

#define ON(x) P1&(~(1<<(x))) //打開某個(gè)燈,開多個(gè)燈用 ON(m) & ON(n)

#define OFF(x) P1|(1<<(x)) //關(guān)閉某個(gè)燈,關(guān)多個(gè)燈用 OFF(m)| OFF(n)

#define on(x) ON(x) //包含大小寫

#define off(x) OFF(x)

#define ledon 0 //某個(gè)燈,打開

#define ledoff 1 //某個(gè)燈,關(guān)閉

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; //鎖定當(dāng)前8個(gè)led的狀態(tài),0鎖定 ,1不鎖定

#endif

void ledCtr(u8 ledX,u8 per) //參數(shù)1是某個(gè)燈,參數(shù)2是亮度

{

u8 i=1;

for(i=1;i<=100;i++)

{

if(i

{

led=on(ledX) ; //打開燈

}

else

{

led=off(ledX); //關(guān)閉燈

}

}

}

void delayms(u16 ms) //毫秒級(jí)軟延時(shí)函數(shù)

{

u16 i,j;

for(i=ms;i>0;i--)

{

for(j=113;j>0;j--)

{}

}

}

void main() //測(cè)試

{

led6=ledon; //打開6號(hào)燈,亮度100%

led=on(0); //打開0號(hào)燈,亮度100%

led=on(1) & on(5); //打開1號(hào)和5號(hào)燈,亮度100%

delayms(2000);

led0=ledoff; //關(guān)閉0號(hào)燈

led=off(6)|off(1)|off(5);//關(guān)閉1,5,6號(hào)燈

while(1)

{

ledCtr(2,5); //僅打開2號(hào)燈,亮度5%, 省電...

}

}