GP2040-CE: gamepad firmware for the Raspberry Pi Pico #Gaming #RP2040 #PiDay #Raspberry_Pi @Hackaday
GP2040-CE is a gamepad firmware for the Raspberry Pi Pico and other boards based on the RP2040 microcontroller, and provides high performance with a rich feature set across multiple platforms. GP2040-CE is compatible with PC, MiSTer, Android, Raspberry Pi, Nintendo Switch, PS3 and PS4 (legacy controller support).
Features
Selectable input modes – XInput, DirectInput, and Nintendo Switch
Overclocked polling rate for less than 1 ms of input latency in all modes
Multiple SOCD cleaning modes – Neutral, Up Priority (a.k.a. Stickless), and Second Input Priority
Left and Right stick emulation via D-pad inputs as well as dedicated toggle switches
Dual direction via D-pad + LS/RS
Reverse input via button
Turbo and Turbo LED with selectable speed
Per-button RGB LED support
PWM Player indicator LED support (XInput only)
Multiple profile support
Support for 128×64 monochrome I2C displays – SSD1306, SH1106, and SH1107 compatible
Custom startup splash screen and easy image upload via web configuration
But how does the humble RP2040 (be it in Pico guise or compatible) provide a web page, you ask? The quick answer comes thanks to Microsoft and their Remote Network Driver Interface Specification (RNDIS) support. RNDIS implements a network device over USB, and luckily, other OSs have caught up and implemented it also. The GP2040 firmware leverages TinyUSB to implement the RNDIS protocol, lwIP to implement a lightweight network stack (whilst only occupying a rather paltry 40k of flash), and finally react-bootstrap to code the actual web logic. (Aren’t modern open source libraries awesome?) If you feel the need to use the source (whether you are named Luke or not) the project can be found on the GP2040 GitHub.
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