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Shadowtrance 955416dac8 Audio System + Drivers (#562)
2026-07-14 08:34:29 +02:00

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SPM1423 PDM microphone

A driver for the SPM1423 PDM MEMS microphone (and compatible PDM mics), wired as an input-only AUDIO_CODEC_TYPE device. Has no I2C/register interface -- just a PDM data line -- so there is no I2C parent; the device sits standalone in the devicetree and only references the I2S controller by name. PDM RX is hardware- restricted to I2S controller 0.

See https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/core/SPM1423HM4H-B_datasheet_en.pdf

License: Apache v2.0

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