Re: [libopencm3-devel] SD card with STM32F1

[Amitesh S. <sin...@gm...>]

Hi Bob,

On Tue, Jan 3, 2023 at 7:55 PM Bob Dunlop <bob...@xy...> wrote:

> Hi,
>
> On Mon, Jan 02 at 02:23, Damien Maguire wrote:
> ...
> > have been struggling to find a good example of using a uSD card with a
> > 32F1 using libopencm3. Perhaps someone could point me in the right
> > direction?
>
> Useful sources for information on interfacing and initialising SDcards:
>   http://elm-chan.org/docs/mmc/mmc_e.html
>   http://elm-chan.org/docs/mmc/m/sdinit.png
>   http://www.cl.cam.ac.uk/teaching/1011/P31/lib/diskio.c
> None of them reference/use libopencm3 but still useful reading.
>
> I have code for STM32F401 libopencm3 that will take you from initialising
> GPIOs to reading sectors from the card and determining it's size.
> A couple of Blackpill cards are what I had spare for a project but no
> reason the codes shouldn't be easily ported to STM32F1, that's kinda
> the point of libopencm3.  Read only operation as that's all I need for
> my project, but sector write would be an easy addition.
>
> Don't have any FAT filesytem code as planning to use a readonly EXT2
> filesystem.  Because...
>
>
> I can email you the relevant files if you want.  I have my own some
> would concider crankey style and it's not ready for public distribution,
> but it's well commented in my opinion, compiles and runs.
>
>
I would be interested in your written code related to reading sd card.
Please share if it's possible for you.
I've had fun with libopencm3/bluepill while making
https://github.com/amitesh-singh/FASTUSBasp

Thanks,
Amitesh


> --
>         Bob Dunlop
>
>
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