Not quite finished but this config might be of help for anyone stumbling upon this topic:
After adding n64.configfile=dummy to recalbox.conf to avoid configgen to generate the button mapping, you can copy this configuration into /recalbox/share/system/configs/mupen64/InputAutoCfg.ini:
[USB GamePad USB GamePad]
plugged = True
plugin = 2
AnalogDeadzone = 2096,2096
AnalogPeak = 21912,21912
Mempak switch =
Rumblepak switch =
mouse = False
A Button = button(1)
B Button = button(2)
C Button D = axis(2+)
C Button L = axis(3+)
C Button R = axis(3-)
C Button U = axis(2-)
DPad D = hat(0 Down)
DPad L = hat(0 Left)
DPad R = hat(0 Right)
DPad U = hat(0 Up)
L Trig = button(6)
R Trig = button(7)
Start = button(8)
Z Trig = button(9)
X Axis = axis(0-,0+)
Y Axis = axis(1-,1+)
I need to dig deeper into the AnalogDeadZone and AnalogPeak to find the best way to get the proper values.
Do not forget to delete the garbage characters on /recalbox/share/system/.emulationstation/es_input.cfg
(.emulationstation is a hidden directory!)
I‘ll share a proper mapping for it as soon as I can.
