USBX Host MSC standalone

[JulInnovel]

Hello all,

Split from this thread:

I'm using an STM32U5G9 and I need to read files from a USB stick.

I don't want to use ThreadX because I have to keep this application small.

How can I achieve this if UsbX and FileX are supposed to be used only with ThreadX and not in standalone mode?

Thanks for your help.

Best regards,

Julien

[FBL]

Hi @JulInnovel 

You cannot use USBX MSC in host mode concurrently on the same medium with another file system FileX or FatFS. The memory is either :

• Exposed to a PC via USBX Device MSC, or 
• Mounted locally with FileX or FatFS,

If two file systems Windows and FileX will concurrently update the same FAT and directory structures. There is no coordination; this leads to inevitable corruption.

[JulInnovel]

Hi,

My original question was: how can I use USBX and FileX to read files from a USB stick (host mode) in standalone mode (so without ThreadX)?

It does not seem to work properly. I tried using the old ST USB stack with FatFS (https://github.com/STMicroelectronics/stm32u5-classic-coremw-apps) instead, and now everything seems to work fine.

Best regards,

Julien