Emulator Exit button GPIO

[crispycritter911]

I was curious as to modify an existing script to work from retropie to RecalBox. I've got a button wired up to a GPIO pin to exit out of all the emulators on RetroPie 3.8 and on 4.0 Beta. However when I try to use the same script in RecalBox I can see the button output on the terminal screen when pressed. I've used this in the event the emulator freezes up and hotkeys don't work, I can still get back to emulation station.
from time import sleep

import os
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

def exitEmulator(channel):
    print('exitEmulator')
    pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]

    for pid in pids:
        try:
            commandpath = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
            if commandpath[0:24] == '/opt/retropie/emulators/':
                os.system('kill -QUIT %s' % pid)
                print('kill -QUIT %s' % pid)
        except IOError:
            continue
GPIO.add_event_detect(17, GPIO.RISING, callback=exitEmulator, bouncetime=500)

while True:
    sleep(10)

Thanks

Here

[Substring]

Hey !

That script is great :) your should edit your post to better handle syntax coloring ;)

The path /opt/retropie/emulators doesn't exist on recalbox. All emulators are stored in /usr/bin, and I wouldt recommend you look for that path. The number of emulators is quite limited : retroarch, mupen64plus, moonlight, scummvm ... Tht.s the ones i can think of right now. I think they are listed in recalboxFiles.py in our configgen python package

[supernature2k]

Sleep 10?

[crispycritter911]

Yeah, I've copied and pasted it from a Reddit thread. Here is where I got it from.
https://www.reddit.com/r/raspberry_pi/comments/2yw4fn/finally_set_up_retropie_complete_with_a_gpio/

I really like the look and feel of RecalBox and wanted to use it in my other pi but had a few hiccups a long the way. One of them being this emulator exit button that I cannot get working on RecalBox. I think the other was the SNES GPIO adapter which I have kind of figured out.

[Substring]

The script is not that hard to adapt :

• list binaries that one wants to shutdown. So far, there is moonlight, retroarch, fba2x, kodilauncher.sh, mupen64plus, scummvm
• instead of getting cmdline, get exe (it's a symbolic link)
• check that exe is among the listed binaries. If so, kill the pid

One could make that script way more dirty : just throw a kill of all known processes, anyway only one of them is supposed to run at once

The next recalbox version will add those binaries : dosbox, PPSSPPSDL, reicast.elf, linapple, x64

What's your knowledge of python ?

[crispycritter911]

My knowledge of Python is pretty much nil. I haven't had any real coding background whatsoever. I've tinkered and modified some stuff ini files for the original xbox to help automate flashing bios and setting up hard drives the way I like it. But that's really it. I usually take other peoples code and modify it to suit my needs. I would like to go back to college someday to learn about coding. Thanks for the input.

[Substring]

very lazy, didn't even try it :

import os
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

def exitEmulator(channel):
    print('exitEmulator')
    os.system('killall retroarch')
    
GPIO.add_event_detect(17, GPIO.RISING, callback=exitEmulator, bouncetime=500)

while True:
    sleep(10)

that can work, only for retroarch for now

you should start this file from a custom.sh located at /recalbox/share/system (you need to create it). Create it yourself add python yourfile.py inside, chmod u+x custom.sh and reboot

[crispycritter911]

Thanks, I'll try it in a bit.

[supernature2k]

I think import time is needed for the sleep function.
Also, I would do it the other way for button press: GPIO.PUD_UP and GPIO.FALLING

the code:

import os
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def exitEmulator(channel):
    print('exitEmulator')
    os.system('killall retroarch')
    
GPIO.add_event_detect(17, GPIO.FALLING, callback=exitEmulator, bouncetime=500)

while True:
    sleep(10)

[supernature2k]

Ok Guys, I made some test.

I put a cable on Pin5 and pin6 and run the following code:

import os
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def exitEmulator(channel):
    print("exitEmulator")
    os.system("killall retroarch")
    
GPIO.add_event_detect(3, GPIO.FALLING, callback=exitEmulator, bouncetime=500)

while True:
    time.sleep(10)

And... it's working :)

Of course in this current state, it's only working with retroarch emulators

[Substring]

haha i'm the man :D

Seriously, most of emulators are listed in the recalboxFiles.py. Would need to improve it because all bins are not listed there. But I really like this idea : kill the running emulator, or even reset the game (there is a topic on it somewhere, will gid this and update my post) -> https://forum.recalbox.com/topic/3435/game-reset/6

[supernature2k]

solution via python with network commands:

import os
import RPi.GPIO as GPIO
import time
import socket
import sys
# addressing information of target
IPADDR = "127.0.0.1"
PORTNUM = 55355
 
# enter the data content of the UDP packet
PACKETDATA = "RESET"
 
# initialize a socket, think of it as a cable
# SOCK_DGRAM specifies that this is UDP
try:
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
except socket.error:
    print 'Failed to create socket'
    sys.exit()
#s.connect((IPADDR, PORTNUM))
 
# connect the socket, think of it as connecting the cable to the address location

data = bytes(PACKETDATA)

GPIO.setmode(GPIO.BCM)
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def exitEmulator(channel):
	print("exitEmulator")
	print(IPADDR)
	print(PORTNUM)
	print(PACKETDATA)
	s.sendto(PACKETDATA, (IPADDR, PORTNUM))
    
GPIO.add_event_detect(3, GPIO.FALLING, callback=exitEmulator, bouncetime=500)

while True:
    time.sleep(10)

[OyyoDams]

@supernature2k Hi,

I'm replying to this old topic because I'm currently working on a project that needs such a feature. I tried your last script, I just removed GPIO code at for now to test, so here is my code:

import os
import time
import socket
import sys
# addressing information of target
IPADDR = "127.0.0.1"
PORTNUM = 55355

# enter the data content of the UDP packet
PACKETDATA = "RESET"

# initialize a socket, think of it as a cable
# SOCK_DGRAM specifies that this is UDP
try:
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
except socket.error:
    print 'Failed to create socket'
    sys.exit()
#s.connect((IPADDR, PORTNUM))

# connect the socket, think of it as connecting the cable to the address location

data = bytes(PACKETDATA)

print("exitEmulator")
print(IPADDR)
print(PORTNUM)
print(PACKETDATA)
s.sendto(PACKETDATA, (IPADDR, PORTNUM))

So to try it, I start a retroarch game then I launch the script:

# python rpi-exit-emulator.py 
exitEmulator
127.0.0.1
55355
RESET

But in fact it does nothing, I'm still in the game (with no reset). Any idea ? :)

[Substring]

@oyyodams it's RESET, not exit ;)

[OyyoDams]

@substring yes that's it's supposed to do... but no reset by the way...

[Substring]

@oyyodams check on command line if you can connect to the port ;) some netcat commands should do it

[OyyoDams]

@substring Well I found a great doc on the wiki. But...

• I can't use netcast: nc is not include in this buildroot build (and I can't rebuild by now)
• It seems retroarch doesn't respond to any command. I tried to edit retroarch.cfg to add network_cmd_enable = "true", nothing better (even after reboot)

I will not let go;)

[Substring]

@oyyodams hold the door !!!

[OyyoDams]

@substring

Don't worry I keep up the good work, things begin to be better, news soon ;)

[OyyoDams]

Ok solution:

network_cmd_enable = "true" has to be added in /recalbox/share/system/configs/retroarch/retroarchcustom.cfg