EDIT:

By default, /usr/share/mupen64plus is read-only, so it won't work unless you enable read-write mode using this command mount -o remount, rw /​

EDIT FOR RECALBOX VERSION> V4.1

jstest no longer exists -> use sdl2-jstest

In case your button 0 exits the emulator (like the hotkey would), you will need to modify the following file: ~/configs/mupen64/mupen64plus.cfg => Change the parameter Joy Mapping Stop = "J1B0" to Joy Mapping Stop = ""​

RECALBOX V3.3.0 ONLY

Mupen64plus is not auto-configured by Recalbox like other emulators. So you have to do it manually.

For information: the button of your Hotkey will be automatically assigned to the output function of the emulator.

A - Add your controller configuration to the system:

​

To configure your controller, you will need information on it. Log in as root, and use the jstest command:

jstest /dev/input/js0

or

sdl2-jstest -l

In my case, I get:

Joystick (Broadcom Bluetooth Wireless  Joystick                        ) has 6 axes (X, Y, Z, Rz, Hat0X, Hat0Y)
and 12 buttons (Trigger, ThumbBtn, ThumbBtn2, TopBtn, TopBtn2, PinkieBtn, BaseBtn, BaseBtn2, BaseBtn3, BaseBtn4, BaseBtn5, BaseBtn6).

Once the name of the controller and each button has been identified, you must modify this file:/usr/share/mupen64plus/InputAutoCfg.ini

Use this command:

nano /usr/share/mupen64plus/InputAutoCfg.ini

Now at the end of the file add the configuration info, like this:

This model is an example, with information about my own controller (controller name, button number etc ...). You will need to adapt it with the information from your own controller.

[Broadcom Bluetooth Wireless  Joystick                        ]
plugged = True
plugin = 2
mouse = False
AnalogDeadzone = 4096,4096
AnalogPeak = 32768,32768
DPad R = hat(0 Right)
DPad L = hat(0 Left)
DPad D = hat(0 Down)
DPad U = hat(0 Up)
Start = button(9)
Z Trig = button(7)
B Button = button(2)
A Button = button(1)
C Button R = axis(3+)
C Button L = axis(3-)
C Button D = axis(2+)
C Button U = axis(2-)
R Trig = button(5)
L Trig = button(4)
Mempak switch = button(6)
Rumblepak switch = 
X Axis = axis(0-,0+)
Y Axis = axis(1-,1+)

Once your configuration is correct, do Ctrl + x to quit nano, agree to overwrite the file with y, and press Enter to quit. You can now start an N64 game, and test your configuration.

Your configuration is correct, do you like it? Great ^^ But there is a "problem". When you update your Recalbox, all of these configuration files are also updated. They will therefore be reset. If you don't want to do this after each update, make a backup of your InputAutoCfg.ini file. You can also add your configuration to Recalbox. You should consult this point, and post your own configuration in comment.

We will then add it to the system during a future update of Recalbox (no longer necessary because a configgen is integrated since version 4.0.0 of Recalbox).

B - Add special commands

Mupen64plus does not support button combinations, like Retroarch emulators, to launch a special command. But you can assign unused buttons to a specific command, like save / load a savestate, change save locations, etc...

To do this, as a first step, you must identify all the unused buttons in your configuration. So as seen before, go to root access and use the jstest command, then write down the code number of your unused buttons.

Now, still in root access, edit your mupen64plus.cfg file with this command:

nano /recalbox/configs/mupen64/mupen64plus.cfg

Then go to the section called [CoreEvents]. The correct section is this:

# Joystick event string for stopping the emulator
Joy Mapping Stop = ""
# Joystick event string for switching between fullscreen/windowed modes
Joy Mapping Fullscreen = ""
# Joystick event string for saving the emulator state
Joy Mapping Save State = ""
# Joystick event string for loading the emulator state
Joy Mapping Load State = ""
# Joystick event string for advancing the save state slot
Joy Mapping Increment Slot = ""
# Joystick event string for taking a screenshot
Joy Mapping Screenshot = ""
# Joystick event string for pausing the emulator
Joy Mapping Pause = ""
# Joystick event string for muting/unmuting the sound
Joy Mapping Mute = ""
# Joystick event string for increasing the volume
Joy Mapping Increase Volume = ""
# Joystick event string for decreasing the volume
Joy Mapping Decrease Volume = ""
# Joystick event string for fast-forward
Joy Mapping Fast Forward = ""
# Joystick event string for pressing the game shark button
Joy Mapping Gameshark = ""

Keep in mind that Mupen64plus identifies player 1 as J0, player 2 as J1 etc... So for example, if you want to add button number 10 of player 1 to the "save savestates" command, you must edit your file like this: Joy Mapping Save State = "J0B10"

And if you want to add button 5 of player 2 to the "load savestates" command, you have to edit your file like this: Joy Mapping Load State = "J1B5"

Once your configuration is correct, do Ctrl + x to quit nano, agree to overwrite the file with y, and press Enter to quit.