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,

故寫(xiě)了個(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

typedefunsignedcharu8;

typedefunsignedshortintu16;

#ifndef_51LED_

#define_51LED_

#defineledP1//P1總線連8個(gè)led燈,燈連573鎖存器,P1置低電平點(diǎn)亮

#defineLEDled

#defineON(x)P1&(~(1<<(x)))//打開(kāi)某個(gè)燈,開(kāi)多個(gè)燈用ON(m)&ON(n)

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

#defineon(x)ON(x)//包含大小寫(xiě)

#defineoff(x)OFF(x)

#defineledon0//某個(gè)燈,打開(kāi)

#defineledoff1//某個(gè)燈,關(guān)閉

sbitled0=P1^0;

sbitled1=P1^1;

sbitled2=P1^2;

sbitled3=P1^3;

sbitled4=P1^4;

sbitled5=P1^5;

sbitled6=P1^6;

sbitled7=P1^7;

sbitledLock=P2^5;//鎖定當(dāng)前8個(gè)led的狀態(tài),0鎖定,1不鎖定

#endif

voidledCtr(u8ledX,u8per)//參數(shù)1是某個(gè)燈,參數(shù)2是亮度

{

u8i=1;

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

{

if(i

{

led=on(ledX);//打開(kāi)燈

}

else

{

led=off(ledX);//關(guān)閉燈

}

}

}

voiddelayms(u16ms)//毫秒級(jí)軟延時(shí)函數(shù)

{

u16i,j;

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

{

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

{}

}

}

voidmain()//測(cè)試

{

led6=ledon;//打開(kāi)6號(hào)燈,亮度100%

led=on(0);//打開(kāi)0號(hào)燈,亮度100%

led=on(1)&on(5);//打開(kāi)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(kāi)2號(hào)燈,亮度5%,省電...

}

}