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STM32H7 - SDMMC Fix the short busy loop being compiled out by newer

Browse source 
versions of GCC.

STM32H7 - Don't go into an infinite loop if an SDIO read fails.

STM32H7 - Generate compiliation error for non-8Mhz crystals when SDCARD
via SDIO is used.  Prevents accidental overclocking of hardware.

Avoid double-init of SD card when CONFIG_IN_SDCARD is used.

Note: There's no SD_DeInit() function.

STM32H7 - Fix MSC SD initialisation when using USE_DMA_SPEC.
This commit is contained in:
Dominic Clifton 2021-05-27 15:31:04 +02:00 • committed by Michael Keller
parent c9d7267cf9
commit 91483d2e8e
6 changed files with 89 additions and 12 deletions
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12
lib/main/STM32H7/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_ll_sdmmc.c
View file

@ -446,13 +446,13 @@ HAL_StatusTypeDef SDMMC_ConfigData(SDMMC_TypeDef *SDMMCx, SDMMC_DataInitTypeDef*
// DC - See errata 2.11.4 - 8 SDMMC clock cycles must elapse before DTEN can be set.
// 32U below is used as a VERY rough guess that the SDMMC clock is 1/4 of the sytem clock, 8 * 4 = 32 and that the
// assembly below only takes 1 CPU cycle to run. All of which will be wrong, but right enough most of the time, especially
// when considering other processing overheads.
// loop code below only takes 2 CPU cycles to run. All of which will likely be wrong, but right enough most of the time.
// It's important that the code isn't optimized-out by the compiler or linker too, see
// https://stackoverflow.com/questions/7083482/how-to-prevent-gcc-from-optimizing-out-a-busy-wait-loop
register uint32_t count = 32U;
do
{
count--;
} while(count > 0);
for (unsigned i = 0; i < count; i++) {
__asm__ volatile("" : "+g" (i) : :);
}
// DC - See errata 2.11.4
/* Write to SDMMC DCTRL */