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;
}
