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piolib: do not try to claim DMA channels that machine has already used - #65
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TinyGo machine always uses DMA channel 0 for SPI0 and channel 1 for SPI1. ClaimChannel started at channel 0, so I2S got the same channel as SPI0. The first SPI write then stopped the I2S DMA and the program hung. Start the search at channel 2.
deadprogram
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@soypat I need this for https://github.com/hybridgroup/tinypod if you could PTAL? Thank you! |
soypat
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Oct 11, 2026
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Thank you for the contribution! |
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TinyGo
machinealways uses DMA channel 0 for SPI0 and DMA channel 1 for SPI1. Seespi0DMAChannelinsrc/machine/machine_rp2.go.ClaimChannelin piolib started the search at channel 0. Thus a piolib driver can get the same channel as SPI0.Example:
piolib.I2Ssends audio and an SD card is on SPI0. The first SPI write changes the I2S DMA channel. Then the program stops.This change starts the search at channel 2.
Test on a xiao-rp2350 with
piolib.I2Sto a PCM5102 and a microSD card on SPI0: