uspi | A bare metal USB driver for Raspberry Pi 1-3 written in C

uspi is a C library typically used in Internet of Things (IoT), Raspberry Pi, Arduino applications. uspi has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

USPi is a bare metal USB driver for the Raspberry Pi written in C. It was ported from the Circle USB library. Using C allows it to be used from bare metal C code for the Raspberry Pi. Like the Circle USB library it supports control (synchronous), bulk and interrupt (synchronous and asynchronous) transfers. Function drivers are available for USB keyboards, mice, MIDI instruments, gamepads, mass storage devices (e.g. USB flash devices) and the on-board Ethernet controller. USPi should run on all existing Raspberry Pi models. USPi comes with an environment library (in the env/ subdirectory) which provides all required functions to get USPi running. Furthermore there are some sample programs (in the sample/ subdirectory) which demonstrate the use of USPi and which rely on the environment library. If you provide your own application and environment both are not needed. Please note that this USB library was developed in a hobby project. There are known issues with it (e.g. no dynamic attachments, no error recovery, limited split support). For me it works well but that need not be the case with any device and in any situation. Also the focus for development was function not performance. USPi was "mechanically" ported from the Circle USB library which is written in C++. That’s why the source code may look a little bit strange. But it was faster to do so.