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sd card cannot be accessed with SDMMC in 4-bit mode

BHoff
Associate II

‎2019-11-19 12:51 AM

I have set the parameter "mode" in CubeMx to SD 4 bits wide bus.

But after doing so, I cannot access newer SD cards (HX) any more. Older cards (512 MB) work fine, which I assume is due to the fact that these cards do not support the 4-bit access from their side.

Are there any restriction or other settings necessary to use the 4-bit wide bus?

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