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

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qbazd commented on issue #6796:
URL: https://github.com/apache/incubator-nuttx/issues/6796#issuecomment-1207386999

   @davids5 
   
   Hi, tnx for reply.
   
   > Did you add the HW and and pull ~50 pull ups on all the lines to the card but not the clock line?
   
   Yes - I have 10k each line - clk, cmd, d0-d3
   
   I've confirmed my hardware setup by working software made with stm32duino (arduino framework) for this NUCLEO-L4R5ZI board.
   
   > Check that "MMC cards support" is disabled Check the pin assignments. 
   
   Here is my screen of config:
   
   ![image](https://user-images.githubusercontent.com/5228328/183287956-b7c17064-b3cd-4c3c-8acf-1bf38cd0184a.png)
   
   > 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.
   
   I understand. I will try to debug GPIO PINS setup registers of SDMMC. Have to learn how exactly, what addresses/values. Will get back with results.
   
   > 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.
   
   Tried to manipulate SDIO_INIT_CLKDIV without success (CLK varies then in +/- couple kHz)
   


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