I found a bug in the stm32WB usb library. After sending an HID message once, the usb will send empty messages indefinitely, which cannot be stopped, and even affects data reception.

[ZZh.1]

This is the data I grabbed with bushound. As shown in the picture, when I send data through HID once, the USB will send empty data packets indefinitely, and subsequent data packets will cause the transmission to be stuck and repeated. I tested the USB driver I designed and the HID sample program of FW_WB_V1.11.0, both of which are the same phenomenon. Through jtag debugging, it is found that after sending data, the register USB_EPnR will repeatedly change between 0x3673 and 0x7633. This is the proof that USB is sending data cyclically, but I can’t find a way to stop or solve it.

And this kind of problem has never appeared in the USB debugging of STM32F4.

[Walid ZRELLI]

Hello @ZZh.1​ ,

Thanks for your contribution.

We confirm the point and we are working on it. We will give you an update as soon as possible.

BeST Regards,

Walid

[Walid ZRELLI · Accepted solution]

Hello @ZZh.1​ ,

For the mentioned behavior, the problem is fixed and it will be available in the next version FW_WB_V1.12.0. 

Here’s the fix : on the file stm32wbxx_hal_pcd.c incomplete condition for the IT handler with interrupt transfers.

Line 1854:

the condition should be :

if ((ep->type == EP_TYPE_INTR) || (ep->type == EP_TYPE_CTRL) ||

            ((ep->type == EP_TYPE_BULK) && ((wEPVal & USB_EP_KIND) == 0U)))

Instead of :

if ((ep->type == EP_TYPE_BULK) && ((wEPVal & USB_EP_KIND) == 0U))

Thanks for your contribution and feel free to raise any issue or feedback.

You're always welcome.

BeST Regards,

Walid