[En-Nut-Discussion] STM32 SDIO support

Uwe Bonnes bon at elektron.ikp.physik.tu-darmstadt.de
Wed Oct 7 11:07:54 CEST 2015

>>>>> "Ole" == Ole Reinhardt <ole.reinhardt at embedded-it.de> writes:

    Ole> Hi Uwe, have you just started any work on the SDIO support? If not,
    Ole> I would start working on it tomorrow.

No, I did not start. Things that kept me from starting:
- other work :-)
- I think we don't have a clean SDIO interface, if we have a defined SDIO
  interface at all.
- there is no app/sdio challenging and demonstrating basic functionality of
  a SDIO driver to allow driver development and verification.

So please, go on. If you need help with the basic STM32 infracturture, like
pin multiplexing or DMA, please let me know. SDIO is special w.r.t. DMA, as
SDIO determines the number of transfers while in all other cases the number
is set by the program. The STM32 DMA interface may not cope with that

    Ole> I have the big STM32F4 Discovery board with Micro-SD Card slot. I
    Ole> think this would be a great hardware to start with. Alternatively
    Ole> with a directly soldered SD-Card socket to the small STM32F4
    Ole> discovery board.

I can test on a F7 discovery.

Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

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