This project tries to fix the axis problem found when using some PlayStation to USB adapters to play games that use DDR (Dance Dance Revolution) mats. There is already a solution for Windows using AutoHotKey, but there appears to be no simple alternative for Linux.
Some DualShock to USB adapters have a problem where d-pad buttons are reported as analog axis, and so when playing DDR-like games (StepMania, for instance) you come to the problem where you can't press two opposing directions at the same time, as there is no way to do that on an analog stick.
On Windows, there is an AutoHotKey based solution which reads the axis position and based on small differences on the axis values, simulates keyboard input. AHK is not available for Linux, so this is not an option.
There is a solution for Linux which involves patching the joystick kernel module (https://github.com/adiel-mittmann/dancepad) but doing that isn't really that intuitive and also relies on patching code that runs in kernel space.
I wrote this tool to solve the problem presented above. It uses the same idea the AHK one uses, watching the joystick's input and simulating keyboard key presses as the 'correct' input to StepMania.
There are 2 modes, config and fix. The config mode serves as a Wizard of sorts to create the .ini configuration file the tool accepts.
fix mode takes a configuration file and starts running the algorithm that takes pad input and converts it to key strokes.
To compile this program, you can just run make on the root folder. If you want it to produce debug messages, then run make debug inside the src/ directory.
I think all you need is to have a recent kernel, since the joystick and uinput modules aren't all that new (to my knowledge).
This tool depends on no dynamic libraries.
Unless stated otherwise in the file (such as in ini.*), the code in this repository is released under an MIT-like license. Check LICENSE for more information.
This tool uses the INIH library, available at https://github.com/benhoyt/inih all credit for ini.h and ini.c should go to their creator and not me.