/*两只老虎**/
#include<reg52.h> sbit Buzz = P1^6; //声明绑定蜂鸣器
unsigned int code NoteFrequ[]={ 523,587,659,698,784,880,988, //中音对应的1-7
1047,1175,1319,1397,1568,1760,1976 //高音对应的1-7
};
unsigned int code NoteReload[]={ //中音1-7和高音1-7对应的定时器重载值
65536 - (11059200/12) /(523*2),//中音1-7
65536 - (11059200/12) /(587*2),
65536 - (11059200/12) /(659*2),
65536 - (11059200/12) /(698*2),
65536 - (11059200/12) /(784*2),
65536 - (11059200/12) /(880*2),
65536 - (11059200/12) /(988*2),
65536 - (11059200/12) /(1047*2),//高音1-7
65536 - (11059200/12) /(1175*2),
65536 - (11059200/12) /(1319*2),
65536 - (11059200/12) /(1397*2),
65536 - (11059200/12) /(1568*2),
65536 - (11059200/12) /(1760*2),
65536 - (11059200/12) /(1970*2)};
bit enable = 1; //发声使能标志
bit tmrflay = 0; //定时器 中断完成标志
unsigned char T0RH = 0xff; //T0重载值高字节
unsigned char T0RL = 0x00; //T0重载值低字节
void PlayTwoTiger(); void main(){
unsigned int i;
EA = 1;
TMOD =0x01; //模式1
TH0 = T0RH;
TL0 = T0RL;
ET0 = 1; //使能T0中断
TR0 = 1; //启动
while(1){
PlayTwoTiger();
for(i=0;i<40000;i++);
}
}
/**音乐函数**/
void PlayTwoTiger(){
unsigned char beat; //节拍索引
unsigned char note; //节拍对应音符
unsigned int time=0; //节拍计时
unsigned int beattime=0; //总时间计时
unsigned int soundtime=0; //没拍发声时间
unsigned char code PlayTwoTigerNote[]={ //音符表
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
};
unsigned char code PlayTwoBeat[]={ //节拍表，4表示一拍，1表示1/4拍，8表示两拍
4,4,4,4, 4,4,4,4, 4,4,8, 4,4,8,
3,1,3,1,4,4, 3,1,3,1,4,4, 4,4,8, 4,4,8,
};
for(beat=0; beat<sizeof(PlayTwoTigerNote);){ //节拍索引循环变量
while(!tmrflay); //每次定时器中断完成 节拍处理
tmrflay = 0;
if(time == 0){ //节拍播放完成重启
note = PlayTwoTigerNote[beat]-1;
T0RH = NoteReload[note]>>8;
T0RL = NoteReload[note]; //计算总时间，右移2位等于除4，移位代替除法加快速度
beattime = (PlayTwoBeat[beat]*NoteFrequ[note])>>2; //计算发声时间，为总时间的0.75s
soundtime =beattime - (beattime>>2);
enable = 1; //开始发声
time++;
}else{ //节拍播放未结束则继续处理
if(time >= beattime){ //当前时间清零
time = 0; //准备重新启动
beat++;
}else{ //累加时间
time++;
if(time == soundtime){ //发声时间到达，关闭蜂鸣器
enable =0; //用以区分连续两个节拍
}
}
}
}
}
void InterRupt() interrupt 1{//中断服务
TH0 =T0RH;
TL0 =T0RL;
tmrflay = 1;
if(enable){
Buzz=~Buzz;
}else{
Buzz=1;
}
}