Audio enable pin required for some cheap yellow displays.

[echo-lalia]

In order to get audio output on my CYD I had to add the following lines to the setup function in main.cpp:

  #ifdef AUDIO_ENABLE_PIN
  // Enable audio (if required)
  pinMode(AUDIO_ENABLE_PIN, OUTPUT);
  Serial.printf("Enabling audio by setting Pin %d to %d", AUDIO_ENABLE_PIN, AUDIO_ENABLE_VAL);
  digitalWrite(AUDIO_ENABLE_PIN, AUDIO_ENABLE_VAL);
  #endif

Then I added this to the build_flags for my CYD:

  -DAUDIO_ENABLE_PIN=GPIO_NUM_4
  -DAUDIO_ENABLE_VAL=LOW

Hopefully this helps someone out 😁