单片机蜂鸣器奏乐代码例子

/************************************************************************
[文件名]  C51音乐程序(八月桂花)
[功能]    通过单片机演奏音乐

/**********************************************************************/
#include <REG52.H>
#include <INTRINS.H>
//本例采用89C52, 晶振为11.0592MHZ
//关于如何编制音乐代码, 其实十分简单,各位可以看以下代码.
//频率常数即音乐术语中的音调,而节拍常数即音乐术语中的多少拍;
//所以拿出谱子, 试探编吧!

sbit GPIO_Beep =  P1^5 ;
unsigned char g_beat = 0;  //节拍常数变量

unsigned char code music_tab[] ={
0x18, 0x30, 0x1C , 0x10, //格式为: 频率常数, 节拍常数, 频率常数, 节拍常数,
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 int0()  interrupt 1   //采用中断0 控制节拍
{
TH0 = 0xd8;
TL0 = 0xef;
g_beat--;
}

void AudioFrequencyDelay (unsigned char m)   //控制频率延时
{
unsigned i=3*m;
while(--i);
}

void BeepTone(unsigned char tone, unsigned char beat)
{
g_beat = beat;
TR0 = 1;  //开定时器1
while(g_beat != 0) //等待节拍完成, 通过P1口输出音频(可多声道哦!)
{
GPIO_Beep = ~GPIO_Beep;
AudioFrequencyDelay(tone);
}
TR0 = 0;   //关定时器1
}

void Delay10ms(unsigned int c)   //误差 0us
{
unsigned char a, b;

//--c已经在传递过来的时候已经赋值了，所以在for语句第一句就不用赋值了--//
for (;c>0;c--)
{
for (b=38;b>0;b--)
{
for (a=130;a>0;a--);
}

}
}

void InitTimer0()
{
TMOD = 0x01; //选择16位计数器
TH0 = 0xd8;	 //(65535 - 10000) / 256
TL0 = 0xef;  //(65535 - 10000) % 256

IE=0x82;   //允许定时器T0中断和总中断
}

void PlaySong()
{
unsigned char i=0;
unsigned char tmpTone = 0;

while(1)
{
tmpTone = music_tab[i];
if(tmpTone == 0x00)  //如果碰到结束符
{
return;
}
else if(tmpTone == 0xff)  //若碰到休止符,延时100ms,继续取下一音符
{
++i;
Delay10ms(10),
TR0=0;
continue;
}
else
{
unsigned char tone, beat;
tone = music_tab[i++];
beat = music_tab[i++];
BeepTone(tone, beat);
}
}
}

void main()
{
InitTimer0();
while(1)
{
PlaySong();
Delay10ms(300);
}
}