STM32F767 – USB Host FatFS works on FS but not on HS (internal FS PHY)

[MADHU2]

Hi,

I'm using an STM32F767 with both USB OTG FS and HS in Host mode.

• FS is working fine with USB MSC + FatFS, and I can create files on a USB stick.

• HS is set to use internal FS PHY (no external ULPI). It detects the pendrive (HOST_USER_CLASS_ACTIVE), but FatFS fails to create/open any file (f_mount or f_open returns FR_DISK_ERR).

This happens in both bare-metal and FreeRTOS.
If I disable FS, HS works fine. But when both are active, only FS works for file ops.

 

Is there any way to get FS and HS USB MSC + FatFS working together when HS uses internal FS PHY?

Any example or suggestion to fix this dual-port issue would be invaluable.

Thanks!

[MADHU2]

Hi @Ghofrane,

Thank you so much for the information! I would really appreciate it if you could take care of this as soon as possible so that I can start my development. Looking forward to your help!

[Andrew Neil]

@Ghofrane GSOURI  suggested that the issue is with FatFS - so maybe you could try asking on the FatFS forum:

https://elm-chan.org/fsw/ff/bd/

Have you checked if there's anything in the list of configuration options: https://elm-chan.org/fsw/ff/doc/config.html ?

Other filesystems are available ...

[MADHU2]

Yes, thank you. I will check the FatFS forum as suggested.

If possible, could you also please share any document, example, or working solution
that demonstrates how to handle this issue (using both FS and HS USB, or switching
between them)?

That would be very helpful.

Thanks again!