查看“播放MP3”的源代码

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<p style="color: #4F4E4E;font-size:220%">'''AudioPro播放MP3示例'''</p>
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在下面的示例中，使用Core+核心控制AudioPro模块从SD卡中读取MP3播放。
<br>
<br>
<p style="color: #E87E05;font-size:155%">所需硬件</p>
*[[MCookie-Core+]]
*[[MBattery+]]
*[[MCookie-Module AudioPro]]
*[[MCookie-SD]]
*一张TF卡/MicroSD卡（存有音乐）
*喇叭
<br>
<p style="color: #E87E05;font-size:155%">电路搭建</p>
将Battery+、Core+、MCookie_SD、MCookie-Module AudioPro堆叠在一起，并插入SD卡，通过MicroUSB数据线接入电脑。
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<p style="color: #E87E05;font-size:155%">代码</p>
<source lang="cpp">
/*
   Microduino_AudioPro支持库例程
   模块WIKI：https://wiki.microduino.cn/index.php/MCookie-Module_AudioPro
   串口控制的简易MP3，需配合Microduino_SD模块使用
   详情见help
*/

#include <Microduino_AudioPro.h>
#include <SD.h>

AudioPro_FilePlayer musicPlayer =  AudioPro_FilePlayer(SD);


uint8_t fileNum = 0;  //文件数量

void playNum(uint8_t num) {
  if (num > musicPlayer.getMusicNum() - 1) {
    return;
  }

  if (!musicPlayer.stopped()) {
    musicPlayer.stopPlaying();  //必要，否则SD类得不到关闭，内存溢出
  }
  musicPlayer.flushCancel(both);  //清缓存，播放MIDI等格式文件时必要

  String _name = musicPlayer.getMusicName(num);
  Serial.print(F("Playing:"));
  if (!musicPlayer.playMP3(_name)) {
    Serial.println(F("ERROR"));
  }
  else {
    Serial.print(F("OK \t File: "));
    Serial.println(_name);
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println(F("AudioPro(VS1053) Simple Test"));
  pinMode(SD_PIN_SEL, OUTPUT);    //先初始化AudioPro，所以先使能SD卡
  digitalWrite(SD_PIN_SEL, HIGH);
  delay(500);

  if (! musicPlayer.begin()) { // initialise the music player
    Serial.println(F("Couldn't find VS1053, do you have the right pins defined?"));
    while (1);
  }
  Serial.println(F("VS1053 found"));

  if (!SD.begin(SD_PIN_SEL)) {
    Serial.println(F("initialization failed!"));
    return;
  }
  Serial.println(F("initialization done."));

  musicPlayer.setVolume(96);  //left & right 0-127
  //or
  //musicPlayer.setVolume(96, 96);  //left right 0-127

  // If DREQ is on an interrupt pin, we can do background
  musicPlayer.useInterrupt(VS1053_PIN_DREQ);  // DREQ int

  help();
}

void loop() {
  if (Serial.available()) {
    char c = Serial.read();
    if ((0x20 <= c) && (c <= 0x126)) {  // strip off non-ASCII, such as CR or LF
      if (c >= '0' && c <= '9') {
        int num = c - 48;
        playNum(num);
      }
      else if (c == 'a') {             //控制运放开关
        if (! musicPlayer.getAmplifier()) {
          Serial.println(F("Amplifier On"));
          musicPlayer.setAmplifier(true);
        } else {
          Serial.println(F("Amplifier Off"));
          musicPlayer.setAmplifier(false);
        }
      }
      else if (c == 's') {    //停止播放音乐
        Serial.println(F("Stopping"));
        musicPlayer.stopPlaying();
      }
      // if we get an 'p' on the serial console, pause/unpause!
      else if (c == 'p') {    //暂停播放音乐
        if (musicPlayer.stopped()) {
          Serial.println(F("Player is Stopping."));
        }
        else if (! musicPlayer.paused()) {
          Serial.println(F("Paused"));
          musicPlayer.pausePlaying(true);
        } else {
          Serial.println(F("Resumed"));
          musicPlayer.pausePlaying(false);
        }
      }
      else if ((c == '-') || (c == '+')) {  //调整音量
        int _volume;
        if (c == '-') { // note dB is negative
          _volume  = musicPlayer.volumeDown();
        }
        else {
          _volume = musicPlayer.volumeUp();
        }
        Serial.print(F("Volume changed to "));
        Serial.println(_volume);
      }
      else if (c == 'i') {          //显示系统常见信息
        Serial.print(F("getVolume:"));
        Serial.println(musicPlayer.getVolume());
        Serial.print(F("getAmplifier:"));
        Serial.println(musicPlayer.getAmplifier());
        Serial.print(F("getPlaySpeed:"));
        Serial.println(musicPlayer.getPlaySpeed());
        Serial.print(F("decodeTime:"));
        Serial.println(musicPlayer.decodeTime());
      }
      else if ((c == '>') || (c == '<')) {  //控制播放速度
        uint16_t playspeed = musicPlayer.getPlaySpeed(); // create key_command existing variable
        // note playspeed of Zero is equal to ONE, normal speed.
        if (c == '>') { // note dB is negative
          playspeed ++; // keep it simpler with whole dB's
        } else {
          playspeed --;
        }
        playspeed = constrain(playspeed, 1, 127);
        musicPlayer.setPlaySpeed(playspeed); // commit new playspeed
        Serial.print(F("playspeed to "));
        Serial.println(playspeed, DEC);
      }
      else if (c == 'm') {          //立体声
        uint16_t monostate = musicPlayer.getMonoMode();
        Serial.print(F("Mono Mode "));
        if (monostate == 0) {
          musicPlayer.setMonoMode(1);
          Serial.println(F("Enabled."));
        } else {
          musicPlayer.setMonoMode(0);
          Serial.println(F("Disabled."));
        }
      }
      else if (c == 'd') {          //差分输出
        uint16_t diff_state = musicPlayer.getDifferentialOutput();
        Serial.print(F("Differential Mode "));
        if (diff_state == 0) {
          musicPlayer.setDifferentialOutput(1);
          Serial.println(F("Enabled."));
        } else {
          musicPlayer.setDifferentialOutput(0);
          Serial.println(F("Disabled."));
        }
      }
      else if (c == 'r') {          //复位VS1053
        Serial.println(F("Reset Player."));
        musicPlayer.reset();
      }
      else if (c == 'n') {          //初始化VS1053
        Serial.println(F("begin Player."));
        musicPlayer.begin();
      }
      else if (c == 'f') {          //关闭VS1053
        Serial.println(F("End Player."));
        musicPlayer.end();
      }
      else if (c == 'l') {          //列出音乐文件清单
        if (musicPlayer.paused() || musicPlayer.stopped()) {
          Serial.println(F("Enter Index of File to play"));
          fileNum = musicPlayer.getMusicNum();    //可以获取SD卡中曲目列表以及数量
          Serial.print(F("Music Files : "));
          Serial.println(fileNum);
          for (uint8_t a = 0; a < fileNum; a++) {
            Serial.print(F("\t File["));
            Serial.print(a);
            Serial.print(F("]: "));
            Serial.println(musicPlayer.getMusicName(a));
          }
        }
        else {
          Serial.println(F("Busy Playing Files, try again later."));
        }

      }
      else if (c == 'h') {          //显示帮助
        help();
      }

    }
  }

  delay(100);
}

void help() {
  Serial.println(F("Microduino AudioPro Library Example:"));
  Serial.println(F("COMMANDS:"));
  Serial.println(F(" [0-9] to play a track"));
  Serial.println(F(" [a] to Set Amplifier"));
  Serial.println(F(" [s] to stop playing"));
  Serial.println(F(" [p] to pause or unpause"));
  Serial.println(F(" [s] to stop playing"));
  Serial.println(F(" [+ or -] to change volume"));
  Serial.println(F(" [> or <] to increment or decrement play speed by 1 factor"));
  Serial.println(F(" [m] Toggle between Mono and Stereo Output."));
  Serial.println(F(" [d] to toggle SM_DIFF between inphase and differential output"));
  Serial.println(F(" [r] Resets and initializes VS10xx chip."));
  Serial.println(F(" [f] turns OFF the VS10xx into low power reset."));
  Serial.println(F(" [n] turns ON the VS10xx out of low power reset."));
  Serial.println(F(" [i] retrieve current audio information (partial list)"));
  Serial.println(F(" [l] Display list of music files"));
  Serial.println(F(" [h] this help"));
}
</source>
[[File:AudioPro MP3.jpg|400px|thumb|center|运行结果]]

对照列表中的项目，每一行开头的字符通过串口输入（波特率115200）：
**0~9 播放SD卡中的歌曲，实际可以更多，此处为示例，可以通过程序修改
**a 开/关LM4863功放模块 
**s 停止播放
**P 暂停播放/继续播放
**+或- 增加1点音量或降低1点音量，可在串口连续输入
**>或< 加速播放或减速播放
**m 切换单声道（mono）与立体声（stereo）
**d 切换同相/区分输出
**r 重启VS1053芯片
**f 将VS1053设置为低功耗模式并重启
**n 将VS1053从低功耗模式唤醒
**i 获取当前音频信息
**l 获取播放列表
**h 帮助列表 
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