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author | Christian Mauderer <christian.mauderer@embedded-brains.de> | 2021-03-19 15:27:21 +0100 |
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committer | Christian Mauderer <christian.mauderer@embedded-brains.de> | 2021-04-01 09:06:40 +0200 |
commit | 20893c5cfd31af74752b03820d10f941908e1cb0 (patch) | |
tree | 8818b5f0e3f77ab0617c4060da0c15b2ccad939f | |
parent | 998f8755e08a0235f3838a9cf537d8f08769c956 (diff) |
user/bsps: Add STM32H7 SDMMC driver
Update #4372
-rw-r--r-- | user/bsps/arm/stm32h7.rst | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/user/bsps/arm/stm32h7.rst b/user/bsps/arm/stm32h7.rst index 8a41ffc..b508595 100644 --- a/user/bsps/arm/stm32h7.rst +++ b/user/bsps/arm/stm32h7.rst @@ -47,3 +47,29 @@ USB Host Driver --------------- The USB host driver ``dwc_otg`` is provided by the ``libbsd``. + +SD/MMC Driver +------------- + +The SDMMC driver ``st_sdmmc`` is provided by the ``libbsd``. + +The default initialization is done for the STM32H743I-EVAL 2 board. + +To use different pins, you can create a ``HAL_SD_MspInit()`` function in your +application that overwrites the default one defined in ``RTEMS``. If you don't +have direction lines like on the evaluation board, you can just skip +initializing these pins. + +If you want to use a different number of data lines, another polarity for the +data direction pins, a different voltage or similar, you have to redefine +``st_sdmmc_get_config()`` (normally provided by ``libbsd``) in your application. + +Known limitations: + +* Currently 1.8V signaling is not implemented. Therefore higher speeds like used + for UHS cards are not available. All cards fall back to High Speed transfers. +* The driver uses the IDMA only. MDMA is currently not implemented. For SDMMC1 + that means that the memory buffers can only come from AXI SRAM, QSPI memory, + Flash or the FMC (SDRAM, ...). The internal SRAM1, SRAM2, SRAM3 and SRAM4 is + not supported. SDMMC2 should not have that limitation. See ST AN5200 "Getting + started with STM32H7 Series SDMMC host controller" for more details. |