Reference

API Description

 /**
   * @fn begin
   * @brief Initialize the device
   * @param baudRate Communication rate
   * @param bit the number of data bit
   * @return Return init status
   */
  uint8_t begin(uint16_t baudRate,uint8_t bit)

  /**
   * @brief Get the data returned from microphone
   * @param buffer Get data buffer
   * @param len    Get data length
   * @return Return the obtained data length
   */
  uint32_t read(char *buffer,size_t len)

  /**
   * @brief Construct the header for the WAVE file
   * @param header Construct the WAVE file
   * @param totalDataLen The length of the data to be written
   * @param longSampleRate Sampling frequency
   * @param channels The number of sound channels
   * @param byteRate Byte rate, calculation formula: sampling rate × the number of sound channels × data bit/8 
   * @param blockAlign Block-aligning way, calculation formula: the number of sound channels × data bit/8 
   */
    void createWavHeader(byte* header, int totalDataLen, int longSampleRate, uint8_t channels, int byteRate, uint8_t blockAlign)

  /**
   * @brief Initialize bluetooth & a2dp
   * @param name  Bluetooth Name
   * @param callback a2dp sends data callback function
   * @param volume Volume
   */
  bool begin(const char* name, esp_a2d_source_data_cb_t callback,uint8_t volume);