Joypad fixed order at startup on linux

RetroArch General
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#1

Hi, I didn’t understand how assign the connected joypad to port when start retroarch. I would like to fix specific USB or bluetooth joypad to retroarch port when start. Is it possibile? I tried to verify the /dev/input/jsX to retroarch port but every time to disconnect and connect a bluetooth/USB the port order change even if the js number it’s the same. i.e. the device /dev/input/js0 is not always port #0 and so on. how reotroarch assign port number to joypad? Please, some one can I help me?

Use specific /dev/input/js* devs, map specific devs to port numbers
#2

You might check out this: https://ubuntuforums.org/showthread.php?t=1595666

I’m not sure if it’ll solve your problem, but it’s worth checking out.

#3

I watched but the post regard the jsX device on OS system only. I don’t understanding how retroarch assign own port number. Seems to be a match between OS jsX name device and retroarch port number.

#4

RetroArch just assigns them to a port in the order the OS hands them to it. That is, the first pad it presents is port 1, second is port 2, etc.

#6

Are you sure?...these are my logs:

TEST1:
/dev/input/js0 --> ATTRS{name}=="8Bitdo SNES30 GamePad"
/dev/input/js1 --> ATTRS{name}=="8Bitdo NES30 Arcade"
/dev/input/js2 --> ATTRS{name}=="Qanba Arcade Joystick D-2.4G"

[INFO] [udev]: Plugged pad: Qanba Arcade Joystick D-2.4G (3888:4406) on port #0.
[INFO] [udev]: Pad #0 (/dev/input/event15) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/Qanba Arcade Joystick D-2.4G.cfg
[INFO] [udev]: Plugged pad: 8Bitdo NES30 Arcade (11720:4225) on port #1.
[INFO] [udev]: Pad #1 (/dev/input/event7) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/8Bitdo NES30 Arcade.cfg
[INFO] [udev]: Plugged pad: 8Bitdo SNES30 GamePad (11720:10304) on port #2.
[INFO] [udev]: Pad #2 (/dev/input/event6) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/8Bitdo SNES30 GamePad.cfg

TEST2:
/dev/input/js0 --> ATTRS{name}=="Qanba Arcade Joystick D-2.4G"
/dev/input/js1 --> ATTRS{name}=="8Bitdo NES30 Arcade"
/dev/input/js2 --> ATTRS{name}=="8Bitdo SNES30 GamePad"

[INFO] [udev]: Plugged pad: Qanba Arcade Joystick D-2.4G (3888:4406) on port #0.
[INFO] [udev]: Pad #0 (/dev/input/event6) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/Qanba Arcade Joystick D-2.4G.cfg
[INFO] [udev]: Plugged pad: 8Bitdo SNES30 GamePad (11720:10304) on port #1.
[INFO] [udev]: Pad #1 (/dev/input/event15) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/8Bitdo SNES30 GamePad.cfg
[INFO] [udev]: Plugged pad: 8Bitdo NES30 Arcade (11720:4225) on port #2.
[INFO] [udev]: Pad #2 (/dev/input/event7) supports 0 force feedback effects.
[INFO] [Autoconf]: 5 profiles found.
[INFO] [Autoconf]: selected configuration: /home/mce/.config/retroarch/autoconfig/8Bitdo NES30 Arcade.cfg

#7

[INFO] RetroArch 1.8.4 (Git d4a1f2ef85)
[INFO] === Build =======================================
[INFO] CPU Model Name: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
[INFO] Capabilities: MMX MMXEXT SSE SSE2 SSE3 SSSE3 SSE4 SSE4.2 AES AVX
[INFO] Built: Jan 21 2020
[INFO] Version: 1.8.4
[INFO] Git: d4a1f2ef85

#8

Yeah, it seems that despite having them as js0, js1, etc., it hands them to RetroArch in essentially random order.

#9

I think I found a solution. The user @meleu made a little c code, I added a new line option inside the code and compiled.
Below the edited code:

/* jslist.c
* This little program just list the joysticks connected to the system.
* The ouput format is "index:JoystickName".
*
* Compile it with:
* [prompt]$ gcc jslist.c -o jslist $(sdl2-config --cflags --libs)
*/

#include <stdio.h>
#include "SDL.h"

int main(void) {
int num_joy, i;
SDL_Init(SDL_INIT_JOYSTICK);
num_joy = SDL_NumJoysticks();
for(i = 0; i < num_joy; i++)
printf("%d:%s\n", i, SDL_JoystickNameForIndex(i));
SDL_Quit();
return 0;
}

The output of the compilated code show me a same port number when retroarch start:

$ /usr/local/bin/jslist
0:Qanba Arcade Joystick D-2.4G
1:8Bitdo NES30 Arcade
2:8Bitdo SNES30 GamePad

I integrated the output code in a selection script and seems to work.
Next days I'll others tests because I want to test very well this job.

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#10

EXAMPLE

~$ /usr/local/bin/jslist
0:Qanba Arcade Joystick D-2.4G
1:8Bitdo SNES30 GamePad
2:8Bitdo NES30 Arcade

~$ for i in $(ls /dev/input/js*);do A=$(udevadm info -a --name $i|grep name);echo "$i --> $A"; done
/dev/input/js0 --> ATTRS{name}=="8Bitdo NES30 Arcade"
/dev/input/js1 --> ATTRS{name}=="8Bitdo SNES30 GamePad"
/dev/input/js2 --> ATTRS{name}=="Qanba Arcade Joystick D-2.4G"

1 Like