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        51單片機蜂鳴器音樂簡譜轉換工具

        作者: 時間:2016-11-18 來源:網絡 收藏
        相信您在作蜂鳴器發聲實驗時肯定為復雜的頻率與音調之間的轉換而傷腦筋,這里向大家介紹一款工具可以大大簡化轉換操作,只需要輸入簡譜就能自動生成音樂播放程序代碼。

        以下此程序的主界面:

        本文引用地址:http://www.104case.com/article/201611/315982.htm

        程序范例可以點主界面上的“關于”按鈕后就能找到,但是代碼也不全,需要加入對音樂程序的調用代碼,其它范例里也寫的很清楚了,只需要調用Play函數就行了,其調用格式如下:


        Play(樂曲名,調號,升降八度,演奏速度);

        經過實踐,此函數的的后三個參數分別設為0,2和350時演奏出的音樂比較符合“原味”,下面給出本站的入門型51實驗板結合此工具作的音樂程序:


        //51單片機播放音樂庫文件
        /**************************************************************************
        SOUND PLAY FOR 51MCU
        COPYRIGHT (c) 2005 BY JJJ.
        -- ALL RIGHTS RESERVED --
        File Name: SoundPlay.h
        Author: Jiang Jian Jun
        Created: 2005/5/16
        Modified: NO
        Revision: 1.0
        *******************************************************************************/
        /*說明**************************************************************************
        曲譜存貯格式 unsigned char code MusicName{音高,音長,音高,音長...., 0,0}; 末尾:0,0 表示結束(Important)
        音高由三位數字組成:
        個位是表示 1~7 這七個音符
        十位是表示音符所在的音區:1-低音,2-中音,3-高音;
        百位表示這個音符是否要升半音: 0-不升,1-升半音。
        音長最多由三位數字組成:
        個位表示音符的時值,其對應關系是:
        |數值(n): |0 |1 |2 |3 | 4 | 5 | 6
        |幾分音符: |1 |2 |4 |8 |16 |32 |64 音符=2^n
        十位表示音符的演奏效果(0-2): 0-普通,1-連音,2-頓音
        百位是符點位: 0-無符點,1-有符點
        調用演奏子程序的格式
        Play(樂曲名,調號,升降八度,演奏速度);
        |樂曲名 : 要播放的樂曲指針,結尾以(0,0)結束;
        |調號(0-11) : 是指樂曲升多少個半音演奏;
        |升降八度(1-3) : 1:降八度, 2:不升不降, 3:升八度;
        |演奏速度(1-12000): 值越大速度越快;
        ***************************************************************************/
        #ifndef __SOUNDPLAY_H_REVISION_FIRST__
        #define __SOUNDPLAY_H_REVISION_FIRST__
        #include
        //**************************************************************************
        #define SYSTEM_OSC 11059200//12000000 //定義晶振頻率12000000HZ
        #define SOUND_SPACE 4/5 //定義普通音符演奏的長度分率,//每4分音符間隔
        sbit BeepIO = P3^5; //定義輸出管腳
        unsigned int code FreTab[12] = { 262,277,294,311,330,349,369,392,415,440,466,494 }; //原始頻率表
        unsigned char code SignTab[7] = { 0,2,4,5,7,9,11 }; //1~7在頻率表中的位置
        unsigned char code LengthTab[7]= { 1,2,4,8,16,32,64 };
        unsigned char Sound_Temp_TH0,Sound_Temp_TL0; //音符定時器初值暫存
        unsigned char Sound_Temp_TH1,Sound_Temp_TL1; //音長定時器初值暫存
        //**************************************************************************
        void InitialSound(void)
        {
        BeepIO = 1;
        Sound_Temp_TH1 = (65535-(1/1200)*SYSTEM_OSC)/256; // 計算TL1應裝入的初值 (10ms的初裝值)
        Sound_Temp_TL1 = (65535-(1/1200)*SYSTEM_OSC)%256; // 計算TH1應裝入的初值
        TH1 = Sound_Temp_TH1;
        TL1 = Sound_Temp_TL1;
        TMOD |= 0x11;
        ET0 = 1;
        ET1 = 0;
        TR0 = 0;
        TR1 = 0;
        EA = 1;
        }
        void BeepTimer0(void) interrupt 1 //音符發生中斷
        {
        BeepIO = !BeepIO;
        TH0 = Sound_Temp_TH0;
        TL0 = Sound_Temp_TL0;
        }
        //**************************************************************************
        void Play(unsigned char *Sound,unsigned char Signature,unsigned Octachord,unsigned int Speed)
        {
        unsigned int NewFreTab[12]; //新的頻率表
        unsigned char i,j;
        unsigned int Point,LDiv,LDiv0,LDiv1,LDiv2,LDiv4,CurrentFre,Temp_T,SoundLength;
        unsigned char Tone,Length,SL,SH,SM,SLen,XG,FD;
        for(i=0;i<12;i++) // 根據調號及升降八度來生成新的頻率表
        {
        j = i + Signature;
        if(j > 11)
        {
        j = j-12;
        NewFreTab[i] = FreTab[j]*2;
        }
        else
        NewFreTab[i] = FreTab[j];
        if(Octachord == 1)
        NewFreTab[i]>>=2;
        else if(Octachord == 3)
        NewFreTab[i]<<=2;
        }
        SoundLength = 0;
        while(Sound[SoundLength] != 0x00) //計算歌曲長度
        {
        SoundLength+=2;
        }
        Point = 0;
        Tone = Sound[Point];
        Length = Sound[Point+1]; // 讀出第一個音符和它時時值
        LDiv0 = 12000/Speed; // 算出1分音符的長度(幾個10ms)
        LDiv4 = LDiv0/4; // 算出4分音符的長度
        LDiv4 = LDiv4-LDiv4*SOUND_SPACE; // 普通音最長間隔標準
        TR0 = 0;
        TR1 = 1;
        while(Point < SoundLength)
        {
        SL=Tone%10; //計算出音符
        SM=Tone/10%10; //計算出高低音
        SH=Tone/100; //計算出是否升半
        CurrentFre = NewFreTab[SignTab[SL-1]+SH]; //查出對應音符的頻率
        if(SL!=0)
        {
        if (SM==1) CurrentFre >>= 2; //低音
        if (SM==3) CurrentFre <<= 2; //高音
        Temp_T = 65536-(50000/CurrentFre)*10/(12000000/SYSTEM_OSC);//計算計數器初值
        Sound_Temp_TH0 = Temp_T/256;
        Sound_Temp_TL0 = Temp_T%256;
        TH0 = Sound_Temp_TH0;
        TL0 = Sound_Temp_TL0 + 12; //加12是對中斷延時的補償
        }
        SLen=LengthTab[Length%10]; //算出是幾分音符
        XG=Length/10%10; //算出音符類型(0普通1連音2頓音)
        FD=Length/100;
        LDiv=LDiv0/SLen; //算出連音音符演奏的長度(多少個10ms)
        if (FD==1)
        LDiv=LDiv+LDiv/2;
        if(XG!=1)
        if(XG==0) //算出普通音符的演奏長度
        if (SLen<=4)
        LDiv1=LDiv-LDiv4;
        else
        LDiv1=LDiv*SOUND_SPACE;
        else
        LDiv1=LDiv/2; //算出頓音的演奏長度
        else
        LDiv1=LDiv;
        if(SL==0) LDiv1=0;
        LDiv2=LDiv-LDiv1; //算出不發音的長度
        if (SL!=0)
        {
        TR0=1;
        for(i=LDiv1;i>0;i--) //發規定長度的音
        {
        while(TF1==0);
        TH1 = Sound_Temp_TH1;
        TL1 = Sound_Temp_TL1;
        TF1=0;
        }
        }
        if(LDiv2!=0)
        {
        TR0=0; BeepIO=1;
        for(i=LDiv2;i>0;i--) //音符間的間隔
        {
        while(TF1==0);
        TH1 = Sound_Temp_TH1;
        TL1 = Sound_Temp_TL1;
        TF1=0;
        }
        }
        Point+=2;
        Tone=Sound[Point];
        Length=Sound[Point+1];
        }
        BeepIO = 1;
        }
        //**************************************************************************
        #endif
        //揮著翅膀的女孩
        unsigned char code Music_Girl[]={ 0x17,0x02, 0x17,0x03, 0x18,0x03, 0x19,0x02, 0x15,0x03,
        0x16,0x03, 0x17,0x03, 0x17,0x03, 0x17,0x03, 0x18,0x03,
        0x19,0x02, 0x16,0x03, 0x17,0x03, 0x18,0x02, 0x18,0x03,
        0x17,0x03, 0x15,0x02, 0x18,0x03, 0x17,0x03, 0x18,0x02,
        0x10,0x03, 0x15,0x03, 0x16,0x02, 0x15,0x03, 0x16,0x03,
        0x17,0x02, 0x17,0x03, 0x18,0x03, 0x19,0x02, 0x1A,0x03,
        0x1B,0x03, 0x1F,0x03, 0x1F,0x03, 0x17,0x03, 0x18,0x03,
        0x19,0x02, 0x16,0x03, 0x17,0x03, 0x18,0x03, 0x17,0x03,
        0x18,0x03, 0x1F,0x03, 0x1F,0x02, 0x16,0x03, 0x17,0x03,
        0x18,0x03, 0x17,0x03, 0x18,0x03, 0x20,0x03, 0x20,0x02,
        0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x20,0x03, 0x21,0x03,
        0x20,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x1F,0x03,
        0x1B,0x03, 0x19,0x03, 0x19,0x03, 0x15,0x03, 0x1A,0x66,
        0x1A,0x03, 0x19,0x03, 0x15,0x03, 0x15,0x03, 0x17,0x03,
        0x16,0x66, 0x17,0x04, 0x18,0x04, 0x18,0x03, 0x19,0x03,
        0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x20,0x03, 0x21,0x03,
        0x20,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x1F,0x03,
        0x1B,0x03, 0x19,0x03, 0x19,0x03, 0x15,0x03, 0x1A,0x66,
        0x1A,0x03, 0x19,0x03, 0x19,0x03, 0x1F,0x03, 0x1B,0x03,
        0x1F,0x00, 0x1A,0x03, 0x1A,0x03, 0x1A,0x03, 0x1B,0x03,
        0x1B,0x03, 0x1A,0x03, 0x19,0x03, 0x19,0x02, 0x17,0x03,
        0x15,0x17, 0x15,0x03, 0x16,0x03, 0x17,0x03, 0x18,0x03,
        0x17,0x04, 0x18,0x0E, 0x18,0x03, 0x17,0x04, 0x18,0x0E,
        0x18,0x66, 0x17,0x03, 0x18,0x03, 0x17,0x03, 0x18,0x03,
        0x20,0x03, 0x20,0x02, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66,
        0x20,0x03, 0x21,0x03, 0x20,0x03, 0x1F,0x03, 0x1B,0x03,
        0x1F,0x66, 0x1F,0x04, 0x1B,0x0E, 0x1B,0x03, 0x19,0x03,
        0x19,0x03, 0x15,0x03, 0x1A,0x66, 0x1A,0x03, 0x19,0x03,
        0x15,0x03, 0x15,0x03, 0x17,0x03, 0x16,0x66, 0x17,0x04,
        0x18,0x04, 0x18,0x03, 0x19,0x03, 0x1F,0x03, 0x1B,0x03,
        0x1F,0x66, 0x20,0x03, 0x21,0x03, 0x20,0x03, 0x1F,0x03,
        0x1B,0x03, 0x1F,0x66, 0x1F,0x03, 0x1B,0x03, 0x19,0x03,
        0x19,0x03, 0x15,0x03, 0x1A,0x66, 0x1A,0x03, 0x19,0x03,
        0x19,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x00, 0x18,0x02,
        0x18,0x03, 0x1A,0x03, 0x19,0x0D, 0x15,0x03, 0x15,0x02,
        0x18,0x66, 0x16,0x02, 0x17,0x02, 0x15,0x00, 0x00,0x00};
        //同一首歌
        unsigned char code Music_Same[]={ 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x66, 0x18,0x03,
        0x17,0x02, 0x15,0x02, 0x16,0x01, 0x15,0x02, 0x10,0x02,
        0x15,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x02,
        0x17,0x03, 0x18,0x03, 0x19,0x02, 0x15,0x02, 0x18,0x66,
        0x17,0x03, 0x19,0x02, 0x16,0x03, 0x17,0x03, 0x16,0x00,
        0x17,0x01, 0x19,0x02, 0x1B,0x02, 0x1B,0x70, 0x1A,0x03,
        0x1A,0x01, 0x19,0x02, 0x19,0x03, 0x1A,0x03, 0x1B,0x02,
        0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x18,0x66, 0x18,0x03,
        0x19,0x02, 0x1A,0x02, 0x19,0x0C, 0x18,0x0D, 0x17,0x03,
        0x16,0x01, 0x11,0x02, 0x11,0x03, 0x10,0x03, 0x0F,0x0C,
        0x10,0x02, 0x15,0x00, 0x1F,0x01, 0x1A,0x01, 0x18,0x66,
        0x19,0x03, 0x1A,0x01, 0x1B,0x02, 0x1B,0x03, 0x1B,0x03,
        0x1B,0x0C, 0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x1F,0x01,
        0x1A,0x01, 0x18,0x66, 0x19,0x03, 0x1A,0x01, 0x10,0x02,
        0x10,0x03, 0x10,0x03, 0x1A,0x0C, 0x18,0x0D, 0x17,0x03,
        0x16,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x70,
        0x18,0x03, 0x17,0x02, 0x15,0x03, 0x15,0x03, 0x16,0x66,
        0x16,0x03, 0x16,0x02, 0x16,0x03, 0x15,0x03, 0x10,0x02,
        0x10,0x01, 0x11,0x01, 0x11,0x66, 0x10,0x03, 0x0F,0x0C,
        0x1A,0x02, 0x19,0x02, 0x16,0x03, 0x16,0x03, 0x18,0x66,
        0x18,0x03, 0x18,0x02, 0x17,0x03, 0x16,0x03, 0x19,0x00,
        0x00,0x00 };
        //兩只蝴蝶
        unsigned char code Music_Two[] ={ 0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
        0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
        0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
        0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x16,0x03,
        0x17,0x01, 0x16,0x03, 0x17,0x03, 0x16,0x03, 0x15,0x01,
        0x10,0x03, 0x15,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
        0x16,0x03, 0x15,0x03, 0x10,0x03, 0x15,0x03, 0x16,0x01,
        0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
        0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
        0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
        0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x19,0x03,
        0x19,0x01, 0x19,0x03, 0x1A,0x03, 0x19,0x03, 0x17,0x01,
        0x16,0x03, 0x16,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
        0x16,0x03, 0x15,0x03, 0x10,0x03, 0x10,0x0D, 0x15,0x00,
        0x19,0x03, 0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03,
        0x1B,0x03, 0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03,
        0x16,0x0D, 0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03,
        0x1A,0x02, 0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03,
        0x16,0x01, 0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03,
        0x19,0x02, 0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E,
        0x1B,0x04, 0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E,
        0x1B,0x04, 0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03,
        0x17,0x0D, 0x16,0x03, 0x17,0x03, 0x19,0x01, 0x19,0x03,
        0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03, 0x1B,0x03,
        0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03, 0x16,0x03,
        0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03, 0x1A,0x02,
        0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x01,
        0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03, 0x19,0x03,
        0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
        0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
        0x17,0x16, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
        0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03, 0x0F,0x02,
        0x10,0x03, 0x15,0x00, 0x00,0x00 };
        void main()
        {
        InitialSound();
        while(1)
        {
        Play(Music_Girl,0,2,350);
        Play(Music_Same,0,2,350);
        Play(Music_Two,0,2,350);
        }
        }

        點擊下載Music Encode

        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

        再例如:關于“世上只有媽媽好”的單片機音樂演奏程序

        單片機演奏一個音符,是通過引腳,周期性的輸出一個特定頻率的方波。
        這就需要單片機,在半個周期內輸出低電平、另外半個周期輸出高電平,周而復始。
        半個周期的時間是多長呢?眾所周知,周期為頻率的倒數,可以通過音符的頻率計算出半周期。
        演奏時,要根據音符頻率的不同,把對應的、半個周期的定時時間初始值,送入定時器,再由定時器按時輸出高低電平。

        下面是個網上廣泛流傳的單片機音樂演奏程序,它可以循環的播放“世上只有媽媽好”這首樂曲。很多人都關心如何修改這個樂曲的內容,但是不知如何入手。
        做而論道對這個程序,給出說明,希望對大家有所幫助,以后大家自己就能夠編寫進去新的樂曲。

        在這個程序中,有兩個數據表,其中存放了事先算好的、各種音符頻率所對應的、半周期的定時時間初始值。
        有了這些數據,單片機就可以演奏從低音、中音、高音和超高音,四個八度共28個音符。

        演奏樂曲時,就根據音符的不同數值,從半周期數據表中找到定時時間初始值,送入定時器即可控制發音的音調。
        比如把表中的0xF2和0x42送到定時器,定時器按照這個初始值來產生中斷,輸出的方波,人們聽起來,這就是低音1。

        樂曲的數據,也要寫個數據表,程序中以 code unsigned char sszymmh[] 命名。
        這個表中每三個數字,說明了一個音符,它們分別代表:
        第一個數字是音符的數值1234567之一,代表多來咪發...;
        第二個數字是0123之一,代表低音、中音、高音、超高音;
        第三個數字是時間長度,以半拍為單位。
        樂曲數據表的結尾是三個0。

        程序如下:

        #include
        sbit speaker = P1^7;
        unsigned char timer0h, timer0l, time;
        //--------------------------------------
        //單片機晶振采用11.0592MHz
        // 頻率-半周期數據表 高八位 本軟件共保存了四個八度的28個頻率數據
        code unsigned char FREQH[] = {
        0xF2, 0xF3, 0xF5, 0xF5, 0xF6, 0xF7, 0xF8, //低音1234567
        0xF9, 0xF9, 0xFA, 0xFA, 0xFB, 0xFB, 0xFC, 0xFC,//1,2,3,4,5,6,7,i
        0xFC, 0xFD, 0xFD, 0xFD, 0xFD, 0xFE, //高音 234567
        0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF}; //超高音 1234567

        // 頻率-半周期數據表 低八位
        code unsigned char FREQL[] = {
        0x42, 0xC1, 0x17, 0xB6, 0xD0, 0xD1, 0xB6, //低音1234567
        0x21, 0xE1, 0x8C, 0xD8, 0x68, 0xE9, 0x5B, 0x8F, //1,2,3,4,5,6,7,i
        0xEE, 0x44, 0x6B, 0xB4, 0xF4, 0x2D, //高音 234567
        0x47, 0x77, 0xA2, 0xB6, 0xDA, 0xFA, 0x16}; //超高音 1234567
        //--------------------------------------
        //世上只有媽媽好數據表 要想演奏不同的樂曲, 只需要修改這個數據表
        code unsigned char sszymmh[] = {
        6, 2, 3, 5, 2, 1, 3, 2, 2, 5, 2, 2, 1, 3, 2, 6, 2, 1, 5, 2, 1,
        //一個音符有三個數字。前為第幾個音、中為第幾個八度、后為時長(以半拍為單位)。
        //6, 2, 3 分別代表:6, 中音, 3個半拍;
        //5, 2, 1 分別代表:5, 中音, 1個半拍;
        //3, 2, 2 分別代表:3, 中音, 2個半拍;
        //5, 2, 2 分別代表:5, 中音, 2個半拍;
        //1, 3, 2 分別代表:1, 高音, 2個半拍;
        //
        6, 2, 4, 3, 2, 2, 5, 2, 1, 6, 2, 1, 5, 2, 2, 3, 2, 2, 1, 2, 1,
        6, 1, 1, 5, 2, 1, 3, 2, 1, 2, 2, 4, 2, 2, 3, 3, 2, 1, 5, 2, 2,
        5, 2, 1, 6, 2, 1, 3, 2, 2, 2, 2, 2, 1, 2, 4, 5, 2, 3, 3, 2, 1,
        2, 2, 1, 1, 2, 1, 6, 1, 1, 1, 2, 1, 5, 1, 6, 0, 0, 0};
        //--------------------------------------

        void t0int() interrupt 1 //T0中斷程序,控制發音的音調
        {
        TR0 = 0; //先關閉T0
        speaker = !speaker; //輸出方波, 發音
        TH0 = timer0h; //下次的中斷時間, 這個時間, 控制音調高低
        TL0 = timer0l;
        TR0 = 1; //啟動T0
        }
        //--------------------------------------
        void delay(unsigned char t) //延時程序,控制發音的時間長度
        {
        unsigned char t1;
        unsigned long t2;
        for(t1 = 0; t1 < t; t1++) //雙重循環, 共延時t個半拍
        for(t2 = 0; t2 < 8000; t2++); //延時期間, 可進入T0中斷去發音
        TR0 = 0; //關閉T0, 停止發音
        }
        //--------------------------------------
        void song() //演奏一個音符
        {
        TH0 = timer0h; //控制音調
        TL0 = timer0l;
        TR0 = 1; //啟動T0, 由T0輸出方波去發音
        delay(time); //控制時間長度
        }
        //--------------------------------------
        void main(void)
        {
        unsigned char k, i;
        TMOD = 1; //置T0定時工作方式1
        ET0 = 1; //開T0中斷
        EA = 1; //開CPU中斷
        while(1) {
        i = 0;
        time = 1;
        while(time) {
        k = sszymmh[i] + 7 * sszymmh[i + 1] - 1;
        //第i個是音符, 第i+1個是第幾個八度
        timer0h = FREQH[k]; //從數據表中讀出頻率數值
        timer0l = FREQL[k]; //實際上, 是定時的時間長度
        time = sszymmh[i + 2]; //讀出時間長度數值
        i += 3;
        song(); //發出一個音符
        } } }
        //======================================
        應網友要求,下面再詳細寫一下樂譜和數據的轉換關系。
        以李叔同大師的《送別》的前二小節來說明轉換的方法。

        這部分的歌詞是:“長 亭 外, 古 道 邊,”;
        這部分的樂譜是:| 5 35 1 - | 6 16 5 - |。
        (注意:樂譜中的1是高音,上邊是帶點的;還有些音符,應該有下劃線,在這里都無法標出。感興趣的網友應該去查看正規的樂譜。)

        那么,據此就可以寫出《送別》前二小節的數據表:
        //--------------------------------------
        code unsigned char sszymmh[] = {
        5, 2, 2, 3, 2, 1, 5, 2, 1, 1, 3, 4,
        //嗦,中音,2個半拍; 咪,中音,1個半拍; 嗦,中音,1個半拍; 哆,高音,4個半拍
        6, 2, 2, 1, 3, 1, 6, 2, 1, 5, 2, 4,
        //啦,中音,2個半拍; 哆,高音,1個半拍; 啦,中音,1個半拍; 嗦,中音,4個半拍
        0, 0, 0};
        //結束標記
        //--------------------------------------

        記住:三個數字一組,代表一個音符。
        第一個數字是1234567之一,代表音符哆來咪發...;
        第二個數字是0123之一,代表低音、中音、高音、超高音;
        第三個數字是半拍的個數,代表時間長度。
        當三個數字都是0,就代表樂曲數據表的結尾。

        用這個數據表,替換掉程序中《世上只有媽媽好》的數據表,本程序就可以播放《送別》的前兩小節。



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