Problem sending data concurrently via Composite USB

[NChin.2]

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.

[Pavel A.]

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.

[NChin.2]

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

[Pavel A.]

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