3dskey

Use a 3DS as a controller on Linux

Requirements:

• 3DS capable of running homebrew applications
• uinput kernel module
• Latest ctrulib from git (current release will not compile this)
• Mono

Usage

• Run make in the 3ds folder, and copy the resulting files to /3ds/3dskey on your SD card
• Compile the DSKey project in MonoDevelop
• Run mono DSKey.exe on your Linux device
• Run 3dskey from the homebrew menu. The devices should connect to each-other

Troubleshooting

/dev/uinput fails to open

Your user doesn't have the correct permissions to create an input device. Run the program with sudo

Stuck on "Waiting for connection..."

1. Make sure you don't have port 19050 UDP and TCP blocked

Protocol

1. DSKey.exe listens on UDP port 19050
2. 3DS sends out a broadcast UDP packet with the contents "ANNOUNCE:3dskey" (15 bytes)
3. 3DS listens on TCP port 19050
4. DSKey.exe receives broadcast and connects to the 3DS on TCP port 19050
5. The 3DS sends the following packets upon state changes:

Type	Value	Description
int32	0xCAFEBABE	Magic Number
uint32	hidKeysDown()	Keys pressed
uint32	hidKeysHeld()	Keys held
uint32	hidKeysUp()	Keys released
int32	hidCircleRead() x value	X-coordinate of the Circle Pad
int32	hidCircleRead() y value	Y-coordinate of the Circle Pad