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stm32/sdcard: Keep SDIO HW flow control disabled on STM32F4. #148

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Merged
iabdalkader merged 1 commit into from
Aug 14, 2026
Merged

stm32/sdcard: Keep SDIO HW flow control disabled on STM32F4. #148

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7 changes: 7 additions & 0 deletions ports/stm32/sdcard.c
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Original file line number Diff line number Diff line change
Expand Up @@ -278,7 +278,14 @@ static HAL_StatusTypeDef sdmmc_init_sd(void) {
#endif
sdmmc_handle.sd.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_ENABLE;
sdmmc_handle.sd.Init.BusWide = SDIO_BUS_WIDE_1B;
#if defined(STM32F4)
// The STM32F4 SDIO hardware flow control is broken (see the errata sheets:
// glitches occur on SDIOCLK when it is enabled, corrupting data written to
// the card), so it must be kept disabled here.
sdmmc_handle.sd.Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_DISABLE;
#else
sdmmc_handle.sd.Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_ENABLE;
#endif
sdmmc_handle.sd.Init.ClockDiv = SDIO_TRANSFER_CLK_DIV;

// init the SD interface, with retry if it's not ready yet
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