Shadowtrance
19 lines
776 B
Markdown
19 lines
776 B
Markdown
# ES7210 microphone ADC
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A driver for the `ES7210` 4-channel microphone ADC by Everest Semiconductor,
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wired as an input-only `AUDIO_CODEC_TYPE` device. The I2C bus is the device's
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parent; the I2S controller carrying the (4-slot TDM) audio data is referenced by
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name.
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Always configures the hardware for the full 4-slot TDM frame regardless of how
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many mics are actually wired (`mic-mask`), then demuxes down to just the active
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mic slots in software -- `es7210_set_fs()` silently halves the configured bit
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depth when asked for 2 or fewer TDM channels, which corrupts audio if the mic
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count is passed straight through.
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Wraps Espressif's `esp_codec_dev` ES7210 implementation.
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See https://www.everest-semi.com/pdf/ES7210%20PB.pdf
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License: [Apache v2.0](LICENSE-Apache-2.0.md)
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