STEVAL Audio

Arduino library to support the MP23DB01HP digital microphone. Currently, this library works only with the STEVAL board. It requires a STM32 Core equal to or greater than version X.Y.Z.

API

This library can be used to record PCM audio on STEVAL board.

After including PCM.h, initialize the library by calling PCM.Begin:

#include <PCM.h>

void setup()
{
  // [...]
  PCM.Begin();
  // [...]
}

Register the data processing callback using PCM.OnReceive:

void process()
{
  Serial.write((const uint8_t *)RecBuff, PCM_REC_BUFF_SIZE * 2U);
}

void setup()
{
  // [...]
  PCM.OnReceive(process);
  // [...]
}

Start recording PCM audio by passing a non-null pointer of a uint16_t[PCM_REC_BUFF_SIZE] buffer to PCM.Record:

uint16_t RecBuff[PCM_REC_BUFF_SIZE];

void setup()
{
  // [...]
  PCM.Record(RecvBuff);
  // [...]
}

You can pause a recording by calling PCM.Pause; in order to resume it, just call PCM.Resume:

void loop()
{
  // [...]
  if (cmd == '1') PCM.Pause();
  if (cmd == '2') PCM.Resume();
  // [...]
}

In order to deinitialize the library, you can execute PCM.End (if recording, you need first to stop it):

void loop()
{
  // [...]
  if (cmd == '3') {
    if (PCM.GetState() == PCM_AUDIO_IN_STATE_RECORDING) PCM.Stop();
    PCM.End();
    while(1);
  }
  // [...]
}

More Info

Source files can be found at https://github.com/stm32duino/STEVAL-Audio

Take a look at STEVAL examples applications at https://github.com/stm32duino/STEVAL-Examples