求指導：51單片機怎么用PWM控制蜂鳴器放歌？

ID:566584 · 發表于 2020-6-13 21:31

對著自己的有源蜂鳴器拿程序研究半天，才知道有源音調改不了

頭都大了
PWM控制調節占空比可以設置音量大小，調節頻率可以調節音調
用延時函數模擬PWM來做比較好？還是通過配置定時器中斷，利用中斷函數進行PWM輸出波形的切換？
又怎么包裝函數讓波形自動變化放歌呢？

希望大佬們能給我講講（最好對著程序講），謝謝

ID:491577 · 發表于 2020-6-13 23:14

有源蜂鳴器只能夠發出固定的聲音，要播放音樂需要使用無源蜂鳴器。不需要用到PWM功能，用定時器就可以了。給你一個參考程序：
/************************************************************************
[文件名]  C51音樂程序(八月桂花)
[功能] 通過單片機演奏音樂

/**********************************************************************/
#include <REG52.H>
#include <INTRINS.H>
//本例采用89C52, 晶振為12MHZ
//關于如何編制音樂代碼, 其實十分簡單,各位可以看以下代碼.
//頻率常數即音樂術語中的音調,而節拍常數即音樂術語中的多少拍;
//所以拿出譜子, 試探編吧!

sbit Beep =  P1^5;

unsigned char n=0;  //n為節拍常數變量
unsigned char code music_tab[] ={
0x18, 0x30, 0x1C , 0x10, //格式為: 頻率常數, 節拍常數, 頻率常數, 節拍常數,
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 //采用中斷0 控制節拍
{  TH0=0xd8;
TL0=0xef;
n--;
}

void delay (unsigned char m) //控制頻率延時
{
unsigned i=3*m;
while(--i);
}

void delayms(unsigned char a)  //豪秒延時子程序
{
  while(--a);                //采用while(--a) 不要采用while(a--); 各位可編譯一下看看匯編結果就知道了!
}

void main()
{ unsigned char p,m; //m為頻率常數變量
  unsigned char i=0;
  TMOD&=0x0f;
  TMOD|=0x01;
  TH0=0xd8;TL0=0xef;
  IE=0x82;
play:
while(1)
{
a: p=music_tab[i];
   if(p==0x00)    { i=0, delayms(1000); goto play;}    //如果碰到結束符,延時1秒,回到開始再來一遍
   else if(p==0xff)  { i=i+1;delayms(100),TR0=0; goto a;}  //若碰到休止符,延時100ms,繼續取下一音符
         else       {m=music_tab[i++], n=music_tab[i++];}  //取頻率常數和節拍常數
         TR0=1;                                           //開定時器1
         while(n!=0) Beep=~Beep,delay(m);                      //等待節拍完成, 通過P1口輸出音頻(可多聲道哦!)
   TR0=0;                                           //關定時器1
}
}

ID:491577 · 發表于 2020-6-13 23:27

再發一個詳細一點的：
SoundPlay.h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"music.h"

#define SYSTEM_OSC 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 =    P1^5; //定義輸出管腳
unsigned char value=0;
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 = 0;
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
{
static unsigned char i;
BeepIO = !BeepIO;
TH0 = Sound_Temp_TH0;
TL0 = Sound_Temp_TL0;
i++;
if(i==100)
{
i=0;
value++;
if(value==5)value=0;
}

}
//**************************************************************************
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=0;
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 = 0;
}
//**************************************************************************
#endif

main.c文件：

#include "reg52.h"    //此文件中定義了單片機的一些特殊功能寄存器
#include "SoundPlay.h"
#include"music.h"

typedef unsigned int u16;    //對數據類型進行聲明定義
typedef unsigned char u8;

void Delay1ms(unsigned int count)
{
unsigned int i,j;
for(i=0;i<count;i++)
for(j=0;j<120;j++);
}

void main()
{
InitialSound();
while(1)
{
Play(Music_Girl,0,3,360);

Delay1ms(500);
Play(Music_Same,0,3,360);
Delay1ms(500);
Play(Music_Two,0,3,360);
Delay1ms(500);
}
}

music.h文件：
#ifndef __MUSIC_H__
#define __MUSIC_H__
//*****************************Music******************************************************
//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
const 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
const 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 };
//***********************************************************************************
#endif

ID:67199 · 發表于 2020-6-14 22:48

幾年前玩翻頁鐘時，用STC60S2的PCA弄過，無源蜂鳴器當音樂鬧鈴

。

if(music_star)    //音樂啟動
   {jiepai=1;          //賦初值
   music_a=*music_p; //節拍速度
   music_b=1;       //
   music_star=0;

   music_f=1;       //音樂播放啟動
   }

if(music_f) //音樂標志為1，放音樂
   {music_b--;       //節拍計時
if(music_b==0)       //四分之一音節到，計時后一個四分之一音節
{music_b=music_a;
   jiepai--;       //節拍減一
   if(jiepai)    //判斷音節演奏完否
   {return;}       //未完成返回繼續演奏
   else          // 完成后取下一個音樂頻率
  {                   //計時復位
CR=0;
jiepai=*(++music_p)&0x0F ; //提取節拍, 以48MHZ為基準,
if(jiepai==0) //節拍為零，表示整首音樂演奏完畢，進行初值回位
{ CR=0;
music_f=0;

   }
else
{yindiao=*music_p>>4;    //提取音調后，指針指向下一音節
if(yindiao)             //音調不為零，由發聲，音調地址=（n-1）*2=2n-2
  { yindiao=yindiao<<1;    //音調代碼乘2
   CCAP0L =TABLE[yindiao+1]; //
   CCAP0H =TABLE[yindiao]; ; //裝載比較初值
CR=1;
}

原程序太大，如感興趣私發給你，自行參考。好久沒玩了，自己都整不太明白了...........

。

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求指導：51單片機怎么用PWM控制蜂鳴器放歌？

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