So I’m writing a program in C that needs to interact with a custom HID device I built. This program will be running on a Raspberry Pi. This isn’t a massively complicated task but it can be daunting when there’s not a single “barebone” example or tutorial out there on how to do this. So I decided to write this sort of guide in case it may come in handy for anyone (including myself, in a future).
Libhid is an open source library designed on top of libusb to deal with HID devices, so the first step is compiling libhid. I’d say this is relatively straight-forward except for the fact that “as-is”, the library fails to build in the Pi. Luckily the problem is a single line of code in one of the examples (yes, and that prevents the whole library from being compiled and installed).