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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/08/06 17:42:40 UTC

[GitHub] [incubator-nuttx] davids5 commented on issue #6796: NUCLEO-L4R5ZI - SDMMC - SDIO - no communication on CMD line

davids5 commented on issue #6796:
URL: https://github.com/apache/incubator-nuttx/issues/6796#issuecomment-1207253621

   @qbazd 
   
   Did you add the HW and and pull ~50 pull ups on all the lines to the card but not the clock line?
   
   Check that "MMC cards support" is disabled 
   Check the pin assignments. Ensure the pins are setup correctly (Verify it with JTAG by looking at the GPIO registers). 
   Break after the [pins are setup](https://github.com/apache/incubator-nuttx/blob/master/arch/arm/src/stm32/stm32_sdio.c#L3062) Then check them again when used to probe the card.
   Some times anther pin is being used and has the wrong config. It could over write one of the SDIO pins.
   Remember too that the interface is booted in 1 Bit mode first and the clock should be <= 400 Khz see SDIO_INIT_CLKDIV.
   
   


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