Drivers for HID+CDC USB composite device (Windows 10)

Hi every one.

I have made a HID + CDC USB composite device. Windows recognizes it and I can control the volume and I have a COM port.

HID is interface 0 and the CDC is interface 2 if this is of any significance.

I can open the COM port with Tera Term and all works wonderfully, but when I try to open the port using python it breaks.

Python gives the following error:

Cannot configure port, something went wrong. Original message: OSError(22, 'The parameter is incorrect.', None, 87)

If I make only CDC device my python code works just fine.

Since I am not that good with USB what would be the next step? What info can i get for you guys.

Cheers!

Super User

The next step would be to understand why Python is throwing that error message and figure out which parameter is incorrect.

The drivers for HID and CDC are built into windows, even when you're using a composite USB device.

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Super User

Not checking the USB function index of control requests?

Visitor II

Hi Dimitar Dyakov,

Can you please share the code/project? Or guideme on how to set usb composite on STM32F4 or STM32F1 please?

Thanks!

Associate III

If you have questions you can post an issue, cheers

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