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PPate.1
PPate.1
Associate III
April 17, 2025
Solved

USB product string no visible on host

  • April 17, 2025
  • 2 replies
  • 1308 views

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:

PPate1_0-1744892248308.png

 

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

Best answer by Pavel A.

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.

 

2 replies

Pavel A.
Pavel A.Answer
Super User
April 17, 2025

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.

 

    F
    FBL
    Technical Moderator
    April 17, 2025

    Hi @PPate.1 

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

    To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.Best regards,FBL
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