Shadowtrance
776 B
776 B
ES7210 microphone ADC
A driver for the ES7210 4-channel microphone ADC by Everest Semiconductor,
wired as an input-only AUDIO_CODEC_TYPE device. The I2C bus is the device's
parent; the I2S controller carrying the (4-slot TDM) audio data is referenced by
name.
Always configures the hardware for the full 4-slot TDM frame regardless of how
many mics are actually wired (mic-mask), then demuxes down to just the active
mic slots in software -- es7210_set_fs() silently halves the configured bit
depth when asked for 2 or fewer TDM channels, which corrupts audio if the mic
count is passed straight through.
Wraps Espressif's esp_codec_dev ES7210 implementation.
See https://www.everest-semi.com/pdf/ES7210%20PB.pdf
License: Apache v2.0