PC sends URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to composite hid device every 5 seconds

[Nix Wayne]

I am not sure if this is STM32 related question but I noticed one strange behaviour while using STM32 devices with USB composite device and composite device only.

So my device is composite device with three different interfaces (HID). I am transfering data from device to PC and I notice there are periodic glitches in data every 5 seconds (exactly). I sniffed the traffic and I noticed that there is URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE from PC side every 5 seconds which obviously is causing glitches.

For additional tests I sniffed traffic on other composite devices and it was same for all of them.

Next I plugged and sniffed non-composite device (Joystick) then I notice there is no URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE .

So this periodic 5 second URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE happens only with composite devices.

What is even more strange is that this happens only on one specific PC but not on other.

So I am thinking could this be problem with USB controller on motherboard?

Any thoughts on that?

Thanks!

[Nix Wayne]

Ok so I found a source of that problem. HTC Vive.... if I remove HTC vive software from PC everything works perfect. So obviously their software/drivers are causing problems with all composite devices. I really wonder what is the reason for "scanning" every 5 seconds and interrupting all other devices.