FreeRTOS vs ThreadX for STM32U575

[ire]

Hi!

I want to build a project for STM32U575. I want to use FreeRTOS, but it seems like there are some functions that won't work with it (like the SD). Is there any place where I can see what works or doesn't with each one? Or if  I can use FreeRTOS anyways and still use the SD?

 

Thanks

[Andrew Neil]

Note that ST are moving back to FreeRTOS as their preferred RTOS:

https://community.st.com/t5/stm32-mcus-embedded-software/freertos-replacing-threadx-as-the-main-kernel-may-2025-stm32/m-p/802609

 

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@ire wrote:

it seems like there are some functions that won't work with it (like the SD).

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What makes you say that? It certainly is possible to have SD Cards working with FreeRTOS.

[ire]

I say that because, when I try to configure my board on STM32Cube, FILEX(for using the SD) is avaiable if I choose ThreadX, but not with FreeRTOS.

 

 

[Andrew Neil]

That's not a limitation of SD itself.

That's because FileX is part of the ThreadX (formerly "Azure RTOS") suite;

For FreeRTOS, FatFS was used as the filesystem component:

https://wiki.st.com/stm32mcu/wiki/Introduction_to_Azure_RTOS_with_STM32

 

The New Direction is now to integrate FileX with FreeRTOS:

https://community.st.com/t5/stm32-mcus-embedded-software/freertos-replacing-threadx-as-the-main-kernel-may-2025-stm32/m-p/802616/highlight/true#M63432

But they haven't done that yet.

[ire]

Ok, I'll try it. Thank you!