SD card driver for NUCLEO-L433RC-P ?

[johngj]

I have the NUCLEO-L433RC-P development board and looking for some code that will allow me to read and write to a micro SD card, but I can't seem to find anything in the example code for this processor.

I found some SD card example code but they were for a different processors and I don't know how to change the processor to an STM32L433

How can I get some software that will allow me to use an SD card with this development board ?

[Andrew Neil]

FatFs is widely used on many (most?) microcontrollers - it can be easily ported to any microcontroller:

http://elm-chan.org/fsw/ff/

[SofLit]

Hello,

Inspire from the example: Projects\STM32L476G-EVAL\Applications\FatFs provided in STM32CubeL4.

[johngj]

Thanks Andrew, I've been trying to use FatFs on an NXP dev board but with no success (see link below for details) which is why I was hoping ST would have an off the shelf solution.

https://community.nxp.com/t5/S32K/Issue-with-SD-card-using-SPI-on-S32K146-CMD17-response-not-zero/m-p/1791257#M30833

Fatfs is only the driver to control a FAT system, it does not include anything to send the SPI commands to the SD card ?

[Tesla DeLorean]

ST doesn't make examples for every conceivable part / board, but rather only those boards they build with specific hardware.

The L4 is perhaps a bit more complex in this regards as there are perhaps 3 SDIO/SDMMC implementations. But it should be possible to migrate the examples for DISCO or EVAL series boards to the NUCLEO with a suitably wired harness. Previously built working examples for clients.

I'd recommend boards like this WaveShare one with appropriate pull-ups and termination

https://www.waveshare.com/wiki/Micro_SD_Storage_Board

[johngj]

Thanks SofLit, I tried to use one of the FatFs_uSD_Standalone examples but it would not run because it was using the wrong processor and I don't know how to change it to a STM32L433.

The settings for MCU in the project properties are greyed out and cannot be changed...

[SofLit]

You need to start from scratch using CubeMx to initialize the needed peripherals mainly the SDIO + Adding FatFs and populate your project by inspiring from the example.

[SofLit]

See this video https://www.youtube.com/watch?v=I9KDN1o6924

[Andrew Neil]

---

@SofLit wrote:

You need to start from scratch using CubeMx

I find this a huge shortcoming!

Surely, one of the most common requirements must be to take some existing code (whether an ST example, or "own" code) and port it to a different processor?

eg, you've prototyped something on a Nucleo or Disco, but will a different variant in production.

Clearly, there can't be a dev board for every single part variant - so this really should be a key requirement for the tools to support?!

[johngj]

Thanks SofLit,  I followed the youtube video but get the following build errors...

The only difference between the youtube video and my project is that I am using the NUCLEO-L433RC-P (whereas the video is using the STM32F746G-DISCO).

I have to use SPI peripheral as the interface, because the L433RC does not have the SDMMC peripheral