ReSpeaker 6-Mic Circular Array HAT on the Raspberry Pi 5: snd-pio-tdm, an out-of-tree ALSA card that carries the HAT's 8-slot TDM bus on RP1's PIO block (RP1 I2S has no TDM). Capture + playback, DKMS, overlay.
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Updated
Sep 7, 2026 - C