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h7: sdio: allow custom clock divider (#14167)

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* add SDIO_CLOCK_DIV define to allow compatibility with a wide range of SD cards

* Update src/platform/STM32/sdio_h7xx.c

Co-authored-by: Petr Ledvina <ledvinap@gmail.com>

---------

Co-authored-by: Petr Ledvina <ledvinap@gmail.com>
This commit is contained in:
Jacob Dahl 2025-01-16 11:16:05 -09:00 • committed by GitHub
parent 892da2d46e
commit 83beeafb0b
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1 changed files with 7 additions and 4 deletions
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11
src/platform/STM32/sdio_h7xx.c
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@ -285,11 +285,14 @@ static SD_Error_t SD_DoInit(void)
hsd1.Init.BusWide = SDMMC_BUS_WIDE_1B; // FIXME untested
}
hsd1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
#if defined(STM32H730xx)
hsd1.Init.ClockDiv = 2; // 200Mhz / (2 * 2 ) = 50Mhz, used for "UltraHigh speed SD card" only, see HAL_SD_ConfigWideBusOperation, SDMMC_HSpeed_CLK_DIV, SDMMC_NSpeed_CLK_DIV
#else
hsd1.Init.ClockDiv = 1; // 200Mhz / (2 * 1 ) = 100Mhz, used for "UltraHigh speed SD card" only, see HAL_SD_ConfigWideBusOperation, SDMMC_HSpeed_CLK_DIV, SDMMC_NSpeed_CLK_DIV
#if !defined(SDIO_CLOCK_DIV)
# if defined(STM32H730xx)
# define SDIO_CLOCK_DIV 2 // 200Mhz / (2 * 2 ) = 50Mhz, used for "UltraHigh speed SD card" only, see HAL_SD_ConfigWideBusOperation, SDMMC_HSpeed_CLK_DIV, SDMMC_NSpeed_CLK_DIV
# else
# define SDIO_CLOCK_DIV 1 // 200Mhz / (2 * 1 ) = 100Mhz, used for "UltraHigh speed SD card" only, see HAL_SD_ConfigWideBusOperation, SDMMC_HSpeed_CLK_DIV, SDMMC_NSpeed_CLK_DIV
# endif
#endif
hsd1.Init.ClockDiv = SDIO_CLOCK_DIV;
status = HAL_SD_Init(&hsd1); // Will call HAL_SD_MspInit
if (status != HAL_OK) {