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sdmmc: don't use high speed mode with SD over SPI

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Disabling due to limitation of SPI driver (max 26MHz for full-duplex
mode over GPIO matrix)
This commit is contained in:
Ivan Grokhotkov
2017-08-24 16:28:37 +08:00
parent 0420c4ec82
commit 631f552489
3 changed files with 8 additions and 3 deletions
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5
docs/api-reference/storage/sdmmc.rst
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@@ -106,6 +106,11 @@ SD SPI driver is represented using an ``sdmmc_host_t`` structure initialized usi
SD SPI driver APIs are very similar to SDMMC host APIs. As with the SDMMC host driver, only ``sdspi_host_init``, ``sdspi_host_init_slot``, and ``sdspi_host_deinit`` functions are normally used by the applications. Other functions are called by the protocol level driver via function pointers in ``sdmmc_host_t`` structure.
.. note:
SD over SPI does not support speeds above SDMMC_FREQ_DEFAULT due to a limitation of SPI driver.
.. doxygenfunction:: sdspi_host_init
.. doxygendefine:: SDSPI_HOST_DEFAULT