STM32N6570-DK Ux_Host_VIDEO example not working with UVC cameras (e.g. Logitech C270)

[JayGani]

Hello,

I'm trying to run the Ux_Host_VIDEO example from STM32CubeN6 on the STM32N6570-DK board, but UVC camera streaming does not work. The USB device is detected, but no video stream starts.

Test Environment:

• Board: STM32N6570-DK

• Example: Ux_Host_VIDEO (from STM32CubeN6 package)

• IDE: STM32CubeIDE 1.18.1

• Camera models tested: Logitech C270

• Connection: USB-C OTG (HS) port using USB-A adapter

USB host stack detects the device and logs:

**** USB OTG HS in HS VIDEO Host ****

USB Host Video library started.

Starting VIDEO Application
Connect your VIDEO Device

USB Video Device Inserted

PID: 0x825
VID: 0x46d
USB Video Host App...
Video Device is ready...

• No streaming happens after that.

• Function _ux_host_class_video_alternate_setting_locate() filters out most alternate settings.

• The condition:

  if (payload_size >= max_payload_size)

  causes only a few alternate settings (e.g., >= 7) to be selected, but those don’t work either.
  
  
  

  Questions:

  1. Has anyone successfully tested this example with a specific UVC camera model?

  2. Why is the payload size condition (payload_size >= max_payload_size) required? Can I safely bypass it?

  3. What’s the correct way to manually select an alternate setting or override wMaxPacketSize?

  4. Is there any known issue with Logitech C270 compatibility in USBX Ux_Host_VIDEO?

  5. Some UVC alternate settings use high-bandwidth isochronous endpoints with multiple transactions (wMaxPacketSize > 1024). Are these supported in the Ux_Host_VIDEO example?

  Let me know if I should share logs or control packet dumps. Any help would be greatly appreciated.

  Thanks!