Shadowtrance
17 lines
790 B
Markdown
17 lines
790 B
Markdown
# Dummy I2S class-D amplifiers (MAX98357A, NS4168)
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A driver covering any I2S class-D speaker amplifier with no I2C/register
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interface -- just an I2S data line plus an optional GPIO enable (SD) pin --
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wired as an output-only `AUDIO_CODEC_TYPE` device. Has no I2C parent; the device
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sits standalone in the devicetree and only references the I2S controller by
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name. Covers the Maxim MAX98357A and NSIway NS4168.
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Since these amps have no hardware volume/mute registers, volume and mute are
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applied in software on the PCM stream via `esp_codec_dev`'s software volume
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handler.
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See https://www.analog.com/media/en/technical-documentation/data-sheets/MAX98357A-MAX98357B.pdf
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And https://datasheet.lcsc.com/lcsc/2110191830_NSIWAY-NS4168_C965904.pdf
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License: [Apache v2.0](LICENSE-Apache-2.0.md)
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