单片机蜂鸣器奏乐，歌曲播放子程序，菜鸟不太懂，求高手详细解释下，谢谢。

#include <瞎含reg51.h> //头文件

unsigned char count//定义全局变量，是一个计数器，0-255计数，仔神档用来计时一个频率的时长

sbit speak=P2^3 //蜂念乱鸣器口

unsigned char code song[]={ //歌曲代码，存储方式为：频率，时长，频率，时长...

0x26,0x20,0x20,0x20,0x20,0x20,0x26,0x10,0x20,0x10,0x20,0x80,0x26,0x20,0x30,0x20,

0x30,0x20,0x39,0x10,0x30,0x10,0x30,0x80,0x26,0x20,0x20,0x20,0x20,0x20,0x1c,0x20,

0x20,0x80,0x2b,0x20,0x26,0x20,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x80,0x26,0x20,

0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x60,0x40,0x10,0x39,0x10,0x26,0x20,

0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x80,0x26,0x20,0x2b,0x10,0x2b,0x10,

0x2b,0x20,0x30,0x10,0x39,0x10,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x20,

0x20,0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x18,0x20,0x18,0x20,0x26,0x20,

0x20,0x20,0x20,0x40,0x26,0x20,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20,0x20,0x20,

0x20,0x80,0x1c,0x20,0x1c,0x20,0x1c,0x20,0x30,0x20,0x30,0x60,0x39,0x10,0x30,0x10,

0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x10,0x26,0x10,0x26,0x10,0x2b,0x10,0x2b,0x80,

0x18,0x20,0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x60,0x26,0x10,0x2b,0x20,0x30,0x20,

0x30,0x20,0x1c,0x20,0x20,0x20,0x20,0x80,0x26,0x20,0x30,0x10,0x30,0x10,0x30,0x20,

0x39,0x20,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x10,0x40,0x10,0x20,0x10,

0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x00,

0x30,0x1C,0x10,0x20,0x40,0x1C,0x10,0x18,0x10,0x20,0x10,0x1C,0x10,0x18,0x40,0x1C,

0x20,0x20,0x20,0x1C,0x20,0x18,0x20,0x20,0x80,0xFF,0x20,0x30,0x1C,0x10,0x18,0x20,

0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,

0x30,0x80,0xFF,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,

0x20,0x2B,0x40,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,

0x20,0x2B,0x40,0x20,0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,

0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,0x30,0x80,0x20,0x30,0x1C,0x10,0x20,

0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x15,0x1F,

0x05,0x20,0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,

0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,

0x20,0x26,0x20,0x20,0x20,0x30,0x30,0x20,0x30,0x1C,0x10,0x18,0x40,0x1C,0x20,0x20,

0x20,0x26,0x40,0x13,0x60,0x18,0x20,0x15,0x40,0x13,0x40,0x18,0x80,0x00,

}

void time0_init() //定时器初始化函数

{

TMOD=0x01//工作方式，16位定时器

IE=0x82 //允许定时器T0中断和总中断

TH0=0xDC //定时器初值高8位，具体时间需要根据晶振计算

TL0=0x00 //定时器初值低8位

}

void time1_int() interrupt 1 //定时器中断函数

{

TH0=0xDC //定时器重赋初值高8位

TL0=0x00 //定时器重赋初值低8位

count++ //计数器自加

}

void delay_xms(unsigned int x) //延时函数

{

unsigned int i,j//定义延时函数局部变量

for(i=0i<xi++)//用for循环实现延时

for(j=0j<3j++) //数值很小，不应该是ms级的，此函数用来改变蜂鸣器频率

}

void play_song(unsigned char i) //歌曲播放函数

{

unsigned char temp1,temp2 //定义局部变量，temp1为频率缓存器，temp2为时长缓存器

unsigned int addr //定义局部变量，是一个数据地址缓存器

count=0 //计数器清零

addr=i*217 //两首歌，数组中0~216为歌曲0，

while(1) //此循环

{

temp1=song[addr++] //从0开始，取偶数地址中的值（频率）放到缓存器temp1，addr自加

if(temp1==0xff) //如果遇到0xff

{

TR0=0 //不允许定时器T0计时

delay_xms(100) //延时，此处0xff可能是停顿符号

}

else if(temp1==0x00) //否则如果遇到0x00

{

return //函数返回，此处的0x00应该是歌曲播完的符号

}

else//否则

{

temp2=song[addr++] //取奇数地址中的值放到缓存器temp2，addr自加

TR0=1 //允许定时器T0计时

while(1) //此循环用来调节蜂鸣器发声频率和时长

{

speak=~speak//蜂鸣器取反，此蜂鸣器为它激式，可以用改变取反频率方式实现发出不同音调

delay_xms(temp1) //延时相应频率所需时长

if(temp2==count)//如果相应频率发声时长与计数器数值相同

{

count=0//计数器清零

break//跳出该while循环

}

}

}

}

}

void main() //主函数

{

time0_init() //调用定时器初始化函数

while(1) //单片机进入正常工作死循环

{

play_song(0) //调用播放歌曲函数，并且播放歌曲0

}

}

/*****

/*我的注释中其实有个错误：取偶数地址中的值放到temp1，取奇数地址中的值放到temp2。因为有0xff停顿符号和0x00停止符号存在于歌曲代码中，以至于偶数地址中并非全是频率代码、奇数地址中并非全是时长代码。但我这样写是方便你理解，所以最后作此说明。*/

*****/

这是我学校电子设计时做的，可以d琴，也有几首歌在里面。。你应该看得懂#include <reg52.h>#define uchar unsigned char

#define uint unsigned int

#define ulong unsigned long

sbit BEEP=P2^0//喇弯闷伏叭输出脚uchar th0_f//在中断中装载的罩伍T0的值高8位

uchar tl0_f/埋携/在中断中装载的T0的值低8位

uchar key/*------------------------------------------------

函数声明

------------------------------------------------*/

uchar keyscan(void)//键盘扫描程序

void delay(uint i)//延时子程序/*-------- T0的值,及输出频率对照表 --------------*/

uchar code freq[36*2]={

0xA9,0xEF,//0x3F,0XEE,//00220HZ ,1 //0

0x93,0xF0,//0X3D,0XEF,//00233HZ ,1#

0x73,0xF1,//0X30,0XF0,//00247HZ ,2

0x49,0xF2,//0X18,0XF1,//00262HZ ,2#

0x07,0xF3,//0XE6,0XF1,//00277HZ ,3

0xC8,0xF3, //0XB7,0XF2,//00294HZ ,4

0x73,0xF4, //0X71,0XF3,//00311HZ ,4#

0x1E,0xF5, //0X2A,0XF4,//00330HZ ,5

0xB6,0xF5, //0XCF,0XF4,//00349HZ ,5#

0x4C,0xF6, //0X72,0XF5,//00370HZ ,6

0xD7,0xF6, //0X09,0XF6,//00392HZ ,6#

0x5A,0xF7, //0X97,0XF6,//00415HZ ,7

0xD8,0xF7, //0X20,0XF7,//00440HZ 1 //12

0x4D,0xF8, //0X9F,0XF7,//00466HZ 1# //13

0xBD,0xF8, //0X18,0XF8,//00494HZ 2 //14

0x24,0xF9, //0X88,0XF8,//00523HZ 2# //15

0x87,0xF9, //0XF3,0XF8,//00554HZ 3 //16

0xE4,0xF9, //0X59,0XF9,//00587HZ 4 //17

0x3D,0xFA, //0X05,0XFA,//00622HZ 4# //18

0x90,0xFA, //0X13,0XFA,//00659HZ 5 //19

0xDE,0xFA, //0X66,0XFA,//00698HZ 5# //20

0x29,0xFB, //0XB9,0XFA,//00740HZ 6//21

0x6F,0xFB, //0X05,0XFB,//00784HZ 6# //22

0xB1,0xFB,//0X4D,0XFB,//00831HZ 7 //23

0xEF,0xFB, //0X90,0XFB,//00880HZ `1

0x2A,0xFC, //0XD0,0XFB,//00932HZ `1#

0x62,0xFC,//0X0C,0XFC,//00988HZ `2

0x95,0xFC, //0X44,0XFC,//01046HZ `2#

0xC7,0xFC, //0X7B,0XFC,//01109HZ `3

0xF6,0xFC, //0XAD,0XFC,//01175HZ `4

0x22,0xFD, //0XDD,0XFC,//01244HZ `4#

0x4B,0xFD, //0X0A,0XFD,//01318HZ `5

0x73,0xFD,//0X35,0XFD,//01397HZ `5#

0x98,0xFD, //0X5D,0XFD,//01480HZ `6

0xBB,0xFD, //0X83,0XFD,//01568HZ `6#

0xDC,0xFD, //0XA6,0XFD,//01661HZ `7 //35

}//定时中断0,用于产生唱歌频率

timer0() interrupt 1

{

TL0=tl0_fTH0=th0_f//调入预定时值

BEEP=~BEEP//取反音乐输出IO

}//音乐符号串解释函数

//入口:要解释的音乐符号串,输出的音调串,输出的时长串

changedata(uchar *song,uchar *diao,uchar *jie)

{

uchar i,i1,j

char gaodi//高低+/-12音阶

uchar banyin//有没有半个升音阶

uchar yinchang//音长

uchar code jie7[8]={0,12,14,16,17,19,21,23}//C调的7个值

*diao=*song

for(i=0,i1=0)

{

gaodi=0//高低=0

banyin=0//半音=0

yinchang=4//音长1拍

if((*(song+i)=='|') || (*(song+i)==' ')) i++

//拍子间隔和一个空格过滤

switch(*(song+i))

{

case ',': gaodi=-12i++//低音

break

case '`': gaodi=12i++//高音

break

}

if(*(song+i)==0) //遇到0结束

{

*(diao+i1)=0//加入结束标志0

*(jie+i1)=0

return

}

j=*(song+i)-0x30i++//取出基准音

j=jie7[j]+gaodi//加上高低音

yinc: switch(*(song+i))

{

case '#': //有半音j加一个音阶

i++j++

goto yinc

case '-': //有一个音节加长

yinchang+=4

i++

goto yinc

case '_': //有一个音节缩短

yinchang/=2

i++

goto yinc

case '.': //有一个加半拍

yinchang=yinchang+yinchang/2

i++

goto yinc

}

*(diao+i1)=j//记录音符

*(jie+i1)=yinchang//记录音长

i1++

}

}//奏乐函数

//入口:要演奏的音乐符号串

void play(uchar *songdata)

{

uchar i,c,j=0

uint n

uchar diaodata[48]//音调缓冲

uchar jiedata[48]//音长缓冲

changedata(songdata,diaodata,jiedata)//解释音乐符号串

TR0=1

for(i=0diaodata[i]!=0i++) //逐个符号演奏

{

tl0_f=freq[diaodata[i]*2]//取出对应的定时值送给T0

th0_f=freq[diaodata[i]*2+1]

for(c=0c<jiedata[i]c++) //按照音长延时

{ key = keyscan()

for(n=0n<29500n++)// 29500

if(key != 0xff)//((!K1)||(!K2)||(!K3)||(!K4))//发现按键,立即退出播放

{

TR0=0

return

}

}

TR0=0

for(n=0n<460n++)//460音符间延时

TR0=1

}

TR0=0

}//一分钱

uchar code yifenqian[]={

"5`1|6_`1_5|3_5_2_3_|5-|"

"3_5_6_`1_|5_6_5_3_|1.3__|2-|"

"3_2_1_2_|3-|6_5_3_5_|6-|"

"5_`1_6_5_|3_5_2|5_2_3_2_|1-|"

}//世上只有妈妈好

uchar code mamahao[]={

"6.5_35|`16_5_6-|35_6_53_2_|1_,6_5_3_2-|"

"2.3_55_6_|321-|5.3_2_1_,6_1_|,5--"

}

//找朋友

uchar code zhaopengyou[]={ "5_6_5_6_|5_6_5|5_`1_7_6_|5 3|"

"5_5_3_4_|5_5_3|1_4_3_2_|1_2_1|"

}

//茉莉花

uchar code molihua[]={"33_5_6_`1_`1_6_|55_6_5-|33_5_6_`1_`1_6_|55_6_5-|"

"5553_5_|665-|32_3_53_2_|11_2_1|"

//"3_2_1_3_2.3_|56_`1_5-|23_5_2_3_1_,6_|,5-,61|"

//"2.3_1_2-1_,6_|,5--"

}

//新年好

uchar code xinnianhao[]={

"1_1_1 ,5|3_3_3 1|1_3_5 5|4_3_2-|"

"2_3_4-|3_2_3 1|1_3_2 ,5|,7_2_1-|"

}

//小星星

uchar code xingxing[]={

"1155|665-|4433|221-|"

"5544|332-|5544|332-|"

"1155|665-|4433|221-|"

}

//外婆的澎湖湾

uchar code waipodephw[]={

"3_5_5_5_6_`1_6_5_|`1_`1_`1_6_5-|"

"`3_`3_`3_`3_`4_`3_`2_`1_|`2_`2_`2_`3_`2-|"

"`3_`3_`3_`3_`4_`3_`2_`1_|6_`1_`1_6_5-|"

}

}

---