MS OS 2.0 descriptor doesn't work when only enable CFG_TUD_VENDOR

[rvosk]

Operating System

Windows 11

Commit SHA

the latest HEAD

Board

any board can reproduce this issue per my test, I tried stm32f103_bluepill and stm32f072disco

Firmware

examples/device/webusb_serial with attached patch to remove the cdc so that only CFG_TUD_VENDOR is enabled.

tinyusb.patch

What happened ?

Windows can't initialize the usb device properly, and UsbTreeView show "28" for the device. so winusb driver isn't installed for the usb device.

BTW: if we enable CDC or HID or MSC or something else with CFG_TUD_VENDOR at the same time, everything works. The issue is only seen when only CFG_TUD_VENDOR=1, others are disabled

How to reproduce ?

apply the tinyusb.patch
build the examples/device/webusb_serial
burn the fw to board and reset the board after done
connect the board to windows usb port with cable
check the usb device's Windows status via. the UsbTreeView, e.g whether it's properly initialized and whether its driver is winusb or not

Debug Log as txt file (LOG/CFG_TUSB_DEBUG=2)

I didn't enable DEBUG LOG, but will do if it's needed.

Screenshots

No response

I have checked existing issues, discussion and documentation

• I confirm I have checked existing issues, discussion and documentation.

[HiFiPhile]

I don't see interface change in your patch.

tinyusb/examples/device/net_lwip_webserver/src/usb_descriptors.c

Line 240 in fee2d2a

U16_TO_U8S_LE(0x0008), U16_TO_U8S_LE(MS_OS_20_SUBSET_HEADER_FUNCTION), ITF_NUM_CDC, 0,

[rvosk]

Hi,

webusb_serial vs net_lwip_webserver ;)
there's no ITF_NUM_CDC in examples/device/webusb_serial/src/usb_descriptors.c

thanks

[HiFiPhile]

Oops just waking up...

Look at dfu example for interface without IAD:

tinyusb/examples/device/dfu/src/usb_descriptors.c

Line 139 in fee2d2a

const uint8_t desc_ms_os_20[] = {

[rvosk]

thank you so much for your kind tips! Let me try today and get back to you.

[rvosk]

the issue still exists after removing IAD from desc_ms_os_20[]

[rvosk]

it looks like only enable CFG_TUD_DFU|MSC|CDC|HID etc works, but only enabling CFG_TUD_VENDOR has the issue.

[rvosk]

OOPS, I made a mistake.

Now I can confirm removing the IAD from desc_ms_os_20[] is the key!
Let me close the bug.

Thank you very much for the kind help.