ctroller lets you use your 3DS as an input device for your Linux system via the uinput kernel module. It consists of a client that runs on your 3DS, continously streaming the 3DS input data to a server on your PC. The server exposes a virtual device to your system, interpretes the data it receives and writes it to a event node under /dev/input/event* or similar.

You will need DevkitARM and the ctrulib to build the 3DS component.

To run the server, the uinput kernel module needs to be loaded:

$ modprobe uinput

Run make to build both components, or enter either of the 3DS/linux subdirectories to build them individually by running make there. You can use the debug target for development.

If you are using Arch Linux, here's the AUR package.

1. Install the server to your system by running make install. This is equivalent to:

$ cd linux
$ make install DESTDIR="/" BINDIR="usr/bin"

2. build the 3DS application:

$ cd 3DS
$ make release

3. Copy 3DS/ctroller.{3dsx,smdh} to /3ds/ctroller/ on your SD card. You can also directly upload the application to your 3DS using upload.sh (do not blindly execute unknown scrips, I'm not responsible if this accidentally deletes your SD card or unfreezes your fridge). To do so, start a FTP server (such as ftpd) on your 3DS on port 5000, then run:

   $ cd 3DS
   $ make upload DSIP=<IP of your 3DS here>

   This requires ftp to be installed on your system.

4. Create a directory ctroller in the root of your SD card

5. Place 3DS/ctroller.cfg in there and replace the IP with the one of your PC. (The config file should now be at sdmc:/ctroller/ctroller.cfg)

Start the server by running:

$ ./linux/ctroller

Then launch the ctroller.3dsx application on your 3DS using a homebrew launcher of your choice.

For development purposes, the 3DS-Makefile includes a run target that uses 3dslink to upload and run the application using the Homebrew Menu NetLoader.

This program is intended to be used in a private network. For simplicity, the server right now accepts any connection on it's port, which might pose a security risk if others can send data to it. This will be changed in future releases. For now, you probably shouldn't be using this in a public network.