ESP32-S2, Internal DAC, not working

[TheMechanos]

Hey, I try to play a .wav file from SPIFFS on internal DAC on ESP32-S2.

  #include "AudioGeneratorWAV.h"
  #include "AudioOutputI2SNoDAC.h"
  #include <AudioOutputNull.h>
  #include <AudioOutputI2S.h>
  #include <AudioFileSourceSPIFFS.h>

  AudioGeneratorWAV *wav;
  AudioFileSourceSPIFFS *file;
  AudioOutputI2S *out;

  void setup() {
    Serial.begin(115200);

    if (!SPIFFS.begin(true)) {
        Serial.println("An Error has occurred while mounting SPIFFS");
        return;
    } else {
        Serial.println("SPIFFS Ok!");
    }

    audioLogger = &Serial;
    file = new AudioFileSourceSPIFFS("/test.wav");
    out = new AudioOutputI2S(0,1);
    wav = new AudioGeneratorWAV();
    wav->begin(file, out);
  }

And I have a error: AudioGeneratorWAV::begin: output's begin did not return true

I think it's a problem with the dac implementation in ESP32-S2. After many changes, I was unable to start this.

Someone knows how to solve it?

[GerLech]

I had the same problem, and solved it by going back to ESP32 Version 1.0.6

[FedericoBusero]

To get sound out of ESP32-S2

• I2S-DAC doesn't work because of hardware limitations (I2S cannot go directly to DAC)
• ULP doesn't work because IDF doesn't support ULP-FSM yet
• but the good news: I2SNoDac works! Using the following code, you get audio on pin 17

include "AudioOutputI2SNoDAC.h"

define I2S_SPEAKER_SERIAL_CLOCK GPIO_NUM_4 // BCLK

define I2S_SPEAKER_LEFT_RIGHT_CLOCK GPIO_NUM_5 // WSEL

define I2S_SPEAKER_SERIAL_DATA GPIO_NUM_17

AudioOutputI2SNoDAC *out; ... out = new AudioOutputI2SNoDAC(); out -> SetPinout(I2S_SPEAKER_SERIAL_CLOCK, I2S_SPEAKER_LEFT_RIGHT_CLOCK, I2S_SPEAKER_SERIAL_DATA);