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General • Re: Pi Pico implemnenting SDIO in Client mode?

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It perhaps depends on how low the Pico can negotiate the bus speed down to.
https://github.com/christinaa/rpi-open- ... #L436-L461

this is an old SD driver for the open firmware
you can see here, where its detecting what version of the SD protocol the card implements, and then picks a clock divisor that sets the right clock rate
so if you just advertise yourself as version 1, a sane host would run at a slower clock rate

The device i am looking to try this with is normally trying to use the 'high speed' mode, it runs normally at 44mhz. i am not sure if saying you support only lower speed would actually work, but i could give it a go, and see
image.png
also i think? this nintendo switch modchip maybe doing something sorta like this, though i am honestly not quite sure what its doing exactly. https://github.com/Ansem-SoD/Picofly

Statistics: Posted by LiEnby — Sat Apr 13, 2024 6:35 am



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