Bug report, USB Host hangs on STM32F417, issue in HAL library used by MX

[RTerr.1]

Bug report in HAL.

Under heavy load, the USB Host stack can hang due to the EPDIR flag on an IN Channel being incorrectly cleared by the HAL.

stm32f4xx_ll_usb.c, function USB_HC_Halt, clears EPDIR in the case that the request queue is full. This routine is called by IN & OUT interrupt handlers and can there leave EPDIR wrongly reset for an IN channel.

In the case of using DMA, tech ref says (in section 'Halting a Channel') that code does not need to check for request queue full - so I think the code should probably take DMA into account as well.

I am using DMA, I have commented out the process queue check.

[Walid ZRELLI]

Hello @RTerr.1​ ,

Thank you for your contribution.

This issue has been reported internally. I will keep you updated as soon as possible.

BeST Regards,

Walid

[Walid ZRELLI]

Internal ticket number: 127522(PS: This is an internal tracking number and is not accessible or usable by customers)

[Walid ZRELLI · Accepted solution]

Hello @RTerr.1​ ,

Could you please indicate which HAL version is used? Because EP dir clear has already been fixed in HAL during HAlt.

It looks like you are using a quite old FW.

Thanks in advance.

BeST Regards,

Walid