Reference

Communication Protocol Description

NOTE:

1. "\r\n is" omitted in all the commands below, and you need to add it to the end of the command in actual use. For example "AT+VOL=5\r\n", designate volume to "5".
2. Default serial baud rate: 115200

• Recording:

1. AT+FUNCTION=2 //Enter recording mode
2. AT+REC=RP // Start Recording
3. AT+REC=SAVE //Save recorded file

• Playing:

1. AT+FUNCTION=1 //Enter music mode
2. AT+PLAY=PP //Playing

/**
 * @brief Test connection 
 */
AT  //Test connection 

/**
 * @brief Volume control(volume degree: 0-30)
 * @param -n:Volume-n
 *        +n:Volume+n
 *         n:Designate volume to n
 *         ?:Query volume
 */
AT+VOL=-5  //Volume-5

AT+VOL=?   //Query volume
Return：VOL = [10]   //Current volume is 10

/**
 * @brief Function switch 
 * @param  1: Music mode 
 *         2: Recording mode 
 *         3: Slave mode 
 */
AT+FUNCTION=1  //Switch to music mode 

/**
 * @brief Playing mode control 
 * @param  1: Repeat one song 
 *         2: Repeat all 
 *         3: Play one song only
 *         ?: Query current playing mode 
 */
AT+PLAYMODE=1   //Switch to repeat one song 

AT+PLAYMODE=?   //Query current playing mode 
Return：PLAYMODE =1  //Current playing mode: repeat one song 

/**
 * @brief Playing control 
 * @param    PP: Play & Pause 
 *         NEXT:Next song 
 *         LAST:Last song 
 */
AT+PLAY=NEXT   //Next song 

/**
 * @brief Play the file of the designate number (default file name) or specific file once 
 * @param        n: Play the music file with name number n()(0-999)，play the first file if there is no one.
 *         File path: play the file of specific path 
 */
AT+PLAYFILE=5                       //Play FILE0005.mp3 once 
AT+PLAYFILE=/DF_REC/test.MP3        //Play test.mp3 under DF_REC once

/**
 * @brief Delete the currently-playing file 
 */
AT+DEL

/**
 * @brief Recording control 
 * @param    RP:Record & Pause
 *         SAVE:Save the recorded file 
 */
AT+REC=SAVE    //Save the recorded file 

/**
 * @brief Set baud rate(power-down save, valid after repowering on)
 * @param    9600, 19200, 38400, 57600, 115200
 */
AT+BAUDRATE=115200  //Set baud rate to 115200

/**
 * @brief Prompt tone ON/OFF commands (power-down save)
 * @param    ON, OFF
 */
AT+PROMPT=ON   //Enable prompt tone 

//LED prompt ON/OFF commands(power-down save) 
/**
 * @brief LED Prompt ON/OFF commands(power-down save) 
 * @param    ON, OFF
 */
AT+LED=ON   //Enable LED prompt

API Description

  /**
   * @brief Set baud rate(Need to power off and restart, power-down save) 
   * @param 9600,19200,38400,57600,115200
   * @return true or false
   */
  bool setBaudRate(uint32_t baud);

  /**
   * @brief Set playback mode
   * @param ePlayMode_t:SINGLECYCLE,ALLCYCLE,SINGLE
   * @return true or false
   */
  bool setPlayMode(ePlayMode_t mode);

  /**
   * @brief Set indicator LED(Power-down save) 
   * @param true or false
   * @return true or false
   */
  bool setLED(bool on);
  
  /**
   * @brief Set prompt tone(power-down save) 
   * @param true or false
   * @return true or false
   */
  bool setPrompt(bool on);
  
  /**
   * @brief Set volume 
   * @param vol:0-30
   * @return true or false
  */
  bool setVol(uint8_t vol);
  
  /**
   * @brief Set working mode 
   * @param eFunction_t:MUSIC,RECORD,UFDISK
   * @return true or false
   */
  bool switchFunction(eFunction_t function);
  
  //bool operation( );
  /**
   * @brief Next 
   * @return true or false
   */
  bool next();
  
  /**
   * @brief Last
   * @return true or false
   */
  bool last();
  
  /**
   * @brief Play(in music mode) or Record (in recording mode)
   * @return true or false
   */
  bool start();
  
  /**
   * @brief Playing Pause(in music mode) or recording pause(in recording mode)
   * @return true or false
   */
  bool pause();
  
  /**
   * @brief Save the recorded voice
   * @return true or false
   */
  String saveRec();

  /**
   * @brief Delete the currently-playing file 
   * @return true or false
   */
  bool delCurFile();
  
  /**
   * @brief Play the file of specific path
   * @param The designated path
   */
  void playSpecFile(String str);
  
  /**
   * @brief Play the file of specific number(only valide for the default file name),
   * @  play the first one if there is no file designated.  
   * @param File name number: 0-999
   */
  void playSpecFile(int16_t num);

  /**
   * @brief Get volume
   * @return vol
   */
  uint8_t getVol();

  /**
   * @brief Get playback mode 
   * @return ePlayMode_t
   */
  ePlayMode_t getPlayMode();

Other Supplementary Information

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