单片机蜂鸣器奏乐代码例子

2019-04-15 18:20发布

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

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