ESP32_DAC_AudioBackend

Class

Source: ESP32_DAC_AudioBackend.h

Inherits from: AudioBackend

Description

Audio backend for ESP32 classic / S2 internal 8-bit DAC.

Uses I2S in DAC-built-in mode so samples are pushed to the DAC via DMA instead of the previous per-sample dacWrite() spin loop. This frees ~15-25% of CPU on Core 0 at 22050 Hz and removes the per-sample pinmux/mutex overhead that dacWrite() incurs on every call.

Target: ESP32 (original), ESP32-S2. The DAC does not exist on S3/C3.

Inheritance

AudioBackend → ESP32_DAC_AudioBackend

Methods

void init(pixelroot32::audio::AudioEngine* engine, const pixelroot32::platforms::PlatformCapabilities& caps)

int getSampleRate() const

void audioTaskLoop()