MCU型号 STC 89C52RC

#include

#defineRldTmr(fr)65536-(11059200/12)/(fr<<1)

#defineFuDian(n)(n<<1)/3//附点n分音符的换算

typedefunsignedcharUCHAR;

typedefunsignedintUINT;

typedefunsignedlongULONG;

sbitBUZZ=P1^6;

UINTcodenoteFreq[]={//中音1-7和高音1-7对应的频率列表

523,587,659,698,784,880,988,

1047,1175,1319,1397,1568,1760,1976

};

UINTcodetmrRld[]={//中音1-7和高音1-7对应的定时器重载值

RldTmr(523),RldTmr(587),RldTmr(659),RldTmr(698),RldTmr(784),RldTmr(880),RldTmr(988),

RldTmr(1047),RldTmr(1175),RldTmr(1319),RldTmr(1397),RldTmr(1568),RldTmr(1760),RldTmr(1976),

};

UCHARcodemusicNote[]={//音名

1,2,3,1,

1,2,3,1,

3,4,5,

3,4,5,

5,6,5,4,3,1,

5,6,5,4,3,1,

1,5,1,

1,5,1

};

UCHARcodenoteDuration[]={//音名对应的时值，4表示4分音符，8表示8分音符，16表示16分音符

4,4,4,4,

4,4,4,4,

4,4,2,

4,4,2,

FuDian(8),16,FuDian(8),16,4,4,

FuDian(8),16,FuDian(8),16,4,4,

4,4,2,

4,4,2

};

bitenable=1,tmrFlg=0;

UCHART0RH=0XFF,T0RL=0X00;

voidDelay(UINTn);

voidPlayMusic(UCHARspeed);//固定标准为4分音符的速度：例如speed=108表示一分钟扫过108个4分音符

voidmain(){

EA=1;

TMOD=0X01;

TH0=T0RH;

TL0=T0RL;

ET0=1;

TR0=1;

while(1){

PlayMusic(72);

Delay(40000u);

}

}

voidDelay(UINTn){

UINTi;

for(i=0;i}

voidPlayMusic(UCHARspeed){

UCHARi;

UCHARidx;

UINTcnt=0;

UINTdurationCnt=0;//当前音符的时值对应的定时器计数

UINTsoundCnt=0;//当前音符的发声时值对应的计数值

for(i=0;iwhile(!tmrFlg);

tmrFlg=0;

if(cnt==0){

idx=musicNote[i]-1;

T0RH=tmrRld[idx]>>8;

T0RL=tmrRld[idx];

durationCnt=(ULONG)240*(ULONG)noteFreq[idx]/((ULONG)noteDuration[i]*(ULONG)speed);

soundCnt=durationCnt-(durationCnt>>2);//当前音符时值的前3/4发声，后1/4静音

enable=1;

cnt++;

}

else{

if(cnt==durationCnt){

cnt=0;

i++;

}

else{

cnt++;

if(cnt==soundCnt){

enable=0;

}

}

}

}

}

voidInterruptTmr0()interrupt1{

TH0=T0RH;

TL0=T0RL;

tmrFlg=1;

if(enable)

BUZZ=~BUZZ;

else

BUZZ=1;

}