I am trying to get the audio working on an ESP32-S3-LCD-1.28-BOX . It uses an NS4168 Class-D I2S amplifier (not an ES8311 as I initially thought).
What I know from the manufacturer:
- I2S_DOUT = GPIO 10
- PA_CTRL (Amplifier Enable) = GPIO 46
- The init sequence requires PA_CTRL to be pulled LOW, then HIGH before playing.
The Problem:
I am using the ESP32-audioI2S library to play an MP3 from the SD card. The code runs perfectly, the SD card is mounted, the MP3 is found and decoded, and the serial monitor shows it "playing" at the correct speed/duration.
However, the speaker only outputs a constant static noise/hiss.
What I've tried:
- Toggling PA_CTRL (GPIO 46) works — the noise appears only when it's HIGH, meaning the amp is turning on.
- The manufacturer didn't provide the BCLK and LRC (WS) pins. I've tried guessing (9/45, 5/4, 17/18, etc.) and swapping them, but still only get static.
- Verified SD card pins (17, 18, 21, 13) and TFT pins — they are not conflicting with audio.
