[GitHub] [incubator-nuttx] a-lunev opened a new pull request #5010: stm32h7 sdmmc: set SDMMC_CK pin to high speed (50 MHz) mode.

[GitBox <gi...@apache.org>]

a-lunev opened a new pull request #5010:
URL: https://github.com/apache/incubator-nuttx/pull/5010


   ## Summary
   
   Set SDMMC_CK pin to high speed (50 MHz) mode.
   When it was in slow speed mode (by default), the output SDMMC_CK clock rise and fall times were about 13 ns each, that were very slow and prevented some SDIO devices from working.
   Moreover, SDMMC D[7:0] and CMD pins were already in high speed (50 MHz) mode rather than SDMMC_CK pin.
   And now the I/O SDMMC speed configuration is the same as it already was for STM32F2/F4/F7 (50 MHz).
   
   ## Impact
   
   STM32H7 SDMMC
   
   ## Testing


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[GitHub] [incubator-nuttx] xiaoxiang781216 merged pull request #5010: stm32h7 sdmmc: set SDMMC_CK pin to high speed (50 MHz) mode.

[GitBox <gi...@apache.org>]

xiaoxiang781216 merged pull request #5010:
URL: https://github.com/apache/incubator-nuttx/pull/5010


   


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