SD card memmory support

[Uman-Butani]

Hello,

Hope everyone are doing well!

Can anyone please provide specific numbers?

What is the maximum size(GB/MB) of the micro SD card each STM32 device can support?

1. STM32F407VET6 - SDIO interface
2. STM32F745VET6 - SDMMC interface
3. STM32H745ZIT6 - 2 SDMMC interface

Let me know if you require any more information.

Also please let me know, How I can conclude the same information for any other controller parts?

Thanks and Regards

Umang

[Andrew Neil]

It doesn't have anything (directly) to do with the microcontroller itself.

It may be limited by the filesystem software you use; eg, FatFs

It will be limited by the formatting you use on the card; eg, FAT-16, FAT-32, ...

[Uman-Butani]

ok,
But let's assume we will use freeRTOS with FatFS as middleware and choose FAT-32 or exFAT formatting. 
How one can calculate the maximum supporting size? 

Thanks, 

[Andrew Neil]

Check the FatFs documentation:

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

Also the documentations of the FAT-32 and exFAT formats.

eg, https://www.sciencedirect.com/topics/computer-science/maximum-file-size

[AScha.3]

Hi,

>What is the maximum size(GB/MB) of the micro SD card each STM32 device can support?

Read in rm of the controller, you want to use :

e.g.

from F407 ds :

from H563 ds:

And as Andrew wrote, size is at first limited by the filesystem and the card type.

I have biggest cards with 64GB and exfat , all working fine.

[Tesla DeLorean]

They should all be able to use 2TB cards with appropriately coded drivers and file systems.

I've tested 400-512 GB cards, larger than practical in my opinion, but usable.

You wouldn't want to use FatFs 0.12 that ST ships. It's from 2017 has issues with large volumes. 

[Uman-Butani]

On which driver/midelware code you have tested this? 

[Tesla DeLorean]

Definitely with F4, F7 and H7, and with eMMC

FatFs 0.14 and 0.15

On Keil w/HAL

Part of the testing / validation is the filling the cards with content (PRBS), and recovering the same.

[Uman-Butani]

Thanks for your input! 
During further testing, as per below snap, 

STM32CUBEMX doesn't have an enable selection to use exFAT with STM32F407VET,

Does this limit our read/write operation on the memory card to 32GB(With FAT32) only?   

[AScha.3]

>Does this limit our read/write operation on the memory card to 32GB(With FAT32) only?

No. Cards up to 32GB can be FAT32 , no problem . (Just check, whats on the card you use, or format it.)

+

Maybe you try : tiny mode -> disabled . (exFAT is not "tiny" ...) Then see...if possible.