USB product string no visible on host

PPate.1 · ‎2025-04-17

Hi,

I have developed custom board with STM32C071CBT6. I configured USB port with USBX in CDC mode. I configured USB device descriptor values as below:

When I connect host Windows 11 PC to my custom board, device manager on PC shows - USB Serial Device(Comxx). It does not show product string as 'STM32 Virtual ComPort'.

Please help debugging this issue.

Thanks,

Pradeep

Pavel A. · ‎2025-04-17

This is how Win11 behaves. For standard in-box classes the names visible in Device Manager come from the Windows drivers which prefer not to expose the firmware strings for some reason. Sometimes you can see the firmware strings in Dev. manager details, "Bus reported device description".

With the old custom driver for "virtual COM port" (no longer recommended) the driver INF file provides the description.

View solution in original post

Pavel A. · ‎2025-04-17

This is how Win11 behaves. For standard in-box classes the names visible in Device Manager come from the Windows drivers which prefer not to expose the firmware strings for some reason. Sometimes you can see the firmware strings in Dev. manager details, "Bus reported device description".

With the old custom driver for "virtual COM port" (no longer recommended) the driver INF file provides the description.

FBL · ‎2025-04-17

Hi @PPate.1

You may also consider using alternative device viewers such as USB Device Viewer, the Windows SDK, or other utilities.

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