Shadowtrance
18 lines
619 B
YAML
18 lines
619 B
YAML
description: Generic PDM MEMS microphone (e.g. SPM1423), I2S PDM RX input
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compatible: "generic,spm1423"
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properties:
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i2s:
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type: phandle
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required: true
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description: "I2S controller device that carries audio data"
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channels:
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type: int
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default: 1
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description: "Number of PDM mics wired (1 = mono, 2 = stereo)"
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input-gain-percent:
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type: int
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default: 400
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description: "Digital gain multiplier applied by audio_stream, as an integer percentage (100 = 1.0x, 400 = 4.0x). PDM mics have no hardware gain; default 400 matches M5Stack's own SPM1423 reference firmware (magnification=4)."
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