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Problem sending data concurrently via Composite USB

NChin.2
Associate II

‎2021-04-25 01:18 AM

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.

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3 REPLIES 3
Pavel A.
Evangelist III

‎2021-04-25 02:07 AM

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.

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NChin.2
Associate II
In response to Pavel A.

‎2021-04-25 06:33 PM

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

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Pavel A.
Evangelist III
In response to NChin.2

‎2021-04-25 11:55 PM

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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