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NChin.2
Visitor II
April 25, 2021
Question

Problem sending data concurrently via Composite USB

  • April 25, 2021
  • 1 reply
  • 1024 views

Hello there,

I've setup a composite device (HID + CDC) on STM32F401RCT MCU. However, when sending data via CDC, the PC can only receive some HID packets (kind of lag issue) or no packet at all. I need to send data via HID and CDC concurrently. Is it possible? If not, do we have another solution?

Thank you.

    This topic has been closed for replies.

    1 reply

    P
    Pavel A.
    Super User
    April 25, 2021

    Do you use the ST "Cube middleware"? If so, it is not perfect; you'll have to tune it up, or find an industrial quality USB library.

    N
    NChin.2Author
    Visitor II
    April 26, 2021

    Yes, I'm using CubeMx Middleware. In my case how to tune it up? I'm quite new to this.

    P
    Pavel A.
    Super User
    April 26, 2021

    I don't have a simple answer unfortunately. Debug the code, a real (hardware) USB analyser would be very helpful.

    Look for examples on github, such of this:

    https://github.com/IntergatedCircuits/USBDevice

    -- pa

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