On USB HID, Keyboard LEDs, and device emulation (2024)

epsilon537.github.io

47 pointstranspute3 comments

This was a good read. I'm currently working on interfacing a microcontroller with USB racing wheels. Parsing the incoming HID data is easy, sending force feedback commands back to the wheel is a different story. A lot of USB sniffing had to be done given Logitech and MOZA's lack of documentation.

Anyways, I'm learning as I go and this writeup was informative.

Glad this popped up here. I've been low-grade tinkering with some USB things and this kind of info is really helpful for getting my bearings.

Found while seeking Linux laptop emulation of USB OTG HID kb/mouse on USB-c cable to iPad/iPhone/Pixel, like a remote KVM.

Once KB/mouse emulation exists, it can be integrated with Linux window manager to treat a tablet/phone as external "display", e.g. move Linux mouse pointer to the right edge of laptop display, push to the right with a bit of physics delay, then activate kb/mouse emulation and send all keystrokes and mouse movements over USB-c cable to the external device.

This would avoid the travel weight cost of a dedicated keyboard for tablet or phone.

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