51單片機(jī) LED點(diǎn)陣的呼吸燈效果

STC 89C52RC

#include

typedefunsignedcharuchar;

typedefunsignedintuint;

typedefunsignedlongulong;

sbitADDR0=P1^0;

sbitADDR1=P1^1;

sbitADDR2=P1^2;

sbitADDR3=P1^3;

sbitENLED=P1^4;

ulongperiodCnt=0;//PWM周期計(jì)數(shù)值

ucharhighRH=0;//高電平重載值的高字節(jié)

ucharhighRL=0;//高電平重載值的低字節(jié)

ucharlowRH=0;//低電平重載值的高字節(jié)

ucharlowRL=0;//低電平重載值的低字節(jié)

ucharT1RH=0;//T1重載值的高字節(jié)

ucharT1RL=0;//T1重載值的低字節(jié)

ucharcodedutyCycle[13]={//占空比調(diào)整表

5,18,30,41,51,60,68,75,81,86,90,93,95

};

ucharcodeimage[8]={

0x81,0x81,0xE7,0xC3,0xC3,0xE7,0x81,0x81

};

ucharhRHi[13],hRLi[13],lRHi[13],lRLi[13];

voidconfigTmr1(uintms);

voidconfigPWM(uintfr,uchardc);

voidcalcRldVal(ucharidx);

voidmain(){

uchari;

EA=1;//開(kāi)總中斷

ADDR3=0;//選中LED點(diǎn)陣

configPWM(1000,dutyCycle[0]);//配置并啟動(dòng)PWM

for(i=0;i<13;i++)

calcRldVal(i);

configTmr1(50);//用T1定時(shí)調(diào)整占空比

while(1);

}

/*配置并啟動(dòng)T1，ms-定時(shí)時(shí)間*/

voidconfigTmr1(uintms){

ulongtmp;//臨時(shí)變量

tmp=11059200/12;//定時(shí)器計(jì)數(shù)頻率

tmp=(tmp*ms)/1000;//計(jì)算所需的計(jì)數(shù)值

tmp=65536-tmp;//計(jì)算定時(shí)器重載值

tmp=tmp+12;//補(bǔ)償中斷響應(yīng)延時(shí)造成的誤差

T1RH=tmp>>8;//定時(shí)器重載值拆分為高低字節(jié)

T1RL=tmp;

TMOD&=0x0F;//清零T1的控制位

TMOD|=0x10;//配置T1為模式1

TH1=T1RH;//加載T1重載值

TL1=T1RL;

ET1=1;//使能T1中斷

TR1=1;//啟動(dòng)T1

}

/*配置并啟動(dòng)PWM，fr-頻率，dc-占空比*/

voidconfigPWM(uintfr,uchardc){

uinthigh,low;

periodCnt=11059200/12/fr;//計(jì)算一個(gè)周期所需的計(jì)數(shù)值

high=periodCnt*dc/100;//計(jì)算高電平所需的計(jì)數(shù)值

low=periodCnt-high;//計(jì)算低電平所需的計(jì)數(shù)值

high=65536-high+12;//計(jì)算高電平的定時(shí)器重載值并補(bǔ)償中斷延時(shí)

low=65536-low+12;//計(jì)算低電平的定時(shí)器重載值并補(bǔ)償中斷延時(shí)

highRH=high>>8;//高電平重載值拆分為高低字節(jié)

highRL=high;

lowRH=low>>8;//低電平重載值拆分為高低字節(jié)

lowRL=low;

TMOD&=0xF0;//清零T0的控制位

TMOD|=0x01;//配置T0為模式1

TH0=highRH;//加載T0重載值

TL0=highRL;

ET0=1;//使能T0中斷

TR0=1;//啟動(dòng)T0

}

/*占空比調(diào)整函數(shù)，頻率不變只調(diào)整占空比*/

voidcalcRldVal(ucharidx){

uinthigh,low;

high=periodCnt*dutyCycle[idx]/100;//計(jì)算高電平所需的計(jì)數(shù)值

low=periodCnt-high;//計(jì)算低電平所需的計(jì)數(shù)值

high=65536-high+12;//計(jì)算高電平的定時(shí)器重載值并補(bǔ)償中斷延時(shí)

low=65536-low+12;//計(jì)算低電平的定時(shí)器重載值并補(bǔ)償中斷延時(shí)

hRHi[idx]=high>>8;//高電平重載值拆分為高低字節(jié)

hRLi[idx]=high;

lRHi[idx]=low>>8;//低電平重載值拆分為高低字節(jié)

lRLi[idx]=low;

}

voidLED1_Scan(){

staticuchari=0;

P0=0xFF;

P1=(P1&0xF8)|i;

P0=image[i];

i=++i&0x07;

}

/*T0中斷服務(wù)函數(shù)，產(chǎn)生PWM輸出*/

voidinterruptTimer0()interrupt1{

if(ENLED==1){

TH0=lowRH;

TL0=lowRL;

ENLED=0;

LED1_Scan();

}

else{

TH0=highRH;

TL0=highRL;

ENLED=1;

}

}

/*T1中斷服務(wù)函數(shù)，定時(shí)動(dòng)態(tài)調(diào)整占空比*/

voidinterruptTimer1()interrupt3{

staticbitdir=0;

staticucharindex=0;

TH1=T1RH;//重新加載T1重載值

TL1=T1RL;

highRH=hRHi[index];

highRL=hRLi[index];

lowRH=lRHi[index];

lowRL=lRLi[index];

if(dir==0){

index++;

if(index==12)

dir=1;

}

else {