Associate II

Question

Problem sending data concurrently via Composite USB

3 replies
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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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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.

Associate II

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

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