Hello, I have a Picade based on MAME and Attract Mode only installed on a standard Bookworm Lite. It works perfectly. I can also manage the sound level from the terminal using the alsamixer command. But I can’t manage it directly from Attract Mode or Mame. I would like to assing Volume with the Button 1 (Left control) + Joystick Up to increase the volume and Btn1+Joy Down to decrease. I tried using the bind or trap command executed from a background service but it doesn’t work. Is there anyone who made this possible with bookworm lite without retropie or an other embedded system. Any help would be greatly appreciated.
OK, I solved the issue.
1st: Install triggerhappy :
sudo apt install triggerhappy
2nd: Check the keys and event number you want to assign. Start the command:
thd --dump /dev/input/event*
and do the manipulation you want to address with your controls. The result will display in the terminal:
EV_KEY KEY_LEFTCTRL 1 /dev/input/event0
# KEY_LEFTCTRL 1 command
EV_KEY KEY_UP 1 /dev/input/event0
# KEY_LEFTCTRL+KEY_UP 1 command
EV_KEY KEY_UP 0 /dev/input/event0
# KEY_LEFTCTRL+KEY_UP 0 command
EV_KEY KEY_LEFTCTRL 0 /dev/input/event0
# KEY_LEFTCTRL 0 command
3rd: Create a configuration file for the service. The name is not important but must finished with ‘.conf’ :
sudo nano /etc/triggerhappy/triggers.d/audio.conf
Add the following lines in the configuration file:
KEY_UP+KEY_LEFTCTRL 1 /usr/bin/amixer set PCM 5%+
KEY_DOWN+KEY_LEFTCTRL 1 /usr/bin/amixer set PCM 5%-
It’s very important, to place KEY_UP or KEY_DOWN first. If you do it by the other way meaning KEY_LEFTCTRL first, you will have to push up the joystick first then press the button.
4th: Change the service user from ‘nobody’ to ‘pi’. Edit the service with command
sudo systemctl edit triggerhappy.service --force --full
and change the ‘–user’ parameter of the ‘ExecStart’ command to ‘pi’
ExecStart=/usr/sbin/thd --triggers /etc/triggerhappy/triggers.d/ --socket /run/thd.socket --user pi --deviceglob /dev/input/event*
5th: Restart the service.
sudo systemctl restart triggerhappy.service
6th: Test the result. Start the alsamixer with the command:
alsamixer
Execute your control combo and you will see the alsamixer cursor moving up and down.
That’s it!
For information: The keyboard keycode can be found in your system at ‘/usr/include/linux/input-event-codes.h’. An online version is visible at this place
Based on those info, the mapping i made for the picade in the ‘/boot/firmware/config.txt’ is:
[all]
dtoverlay=picade
dtparam=audio=off
dtparam=up=103
dtparam=down=108
dtparam=left=105
dtparam=right=106
dtparam=button1=29
dtparam=button2=56
dtparam=button3=57
dtparam=button4=42
dtparam=button5=25
dtparam=button6=15
dtparam=enter=28
dtparam=escape=1
dtparam=coin=6
dtparam=start=2
which corresponds to:
| Picade Control | Key | Code |
|---|---|---|
| Joystick Up | KEY_UP | 103 |
| Joystick Down | KEY_DOWN | 108 |
| Joystick Left | KEY_LEFT | 105 |
| Joystick Right | KEY_RIGHT | 106 |
| Button 1 | KEY_LEFTCTRL | 29 |
| Button 2 | KEY_LEFTALT | 56 |
| Button 3 | KEY_SPACE | 57 |
| Button 4 | KEY_LEFTSHIFT | 42 |
| Button 5 | KEY_P | 25 |
| Button 6 | KEY_TAB | 15 |
| Right side (Enter) | KEY_ENTER | 15 |
| Left side (Escape) | KEY_ESC | 1 |
| Front Right (Coin) | KEY_5 | 6 |
| Front Left (Start) | KEY_1 | 2 |