GPIO ONOFF Powerswitch / Resetbutton Problem

  • Hi,
    i have a little problem with my custom snes. The on/off switch and the momentary resetbutton both work fine, but almost always (sometime it works) if i plug in something to the USB Port, LAN Port or audio jack, recalbox shuts down or resets (as if i pressed the button, but i didn't).

    My hard-and software:

    Raspberry Pi model:
    3 B
    Recalbox version (build) :
    Hardware (Micro SD, Power Supply, etc.):
    USB Hub, Snes controller to usb Adapter , micro SD Extension cable, Audiojack extension cable,
    HDMI extension cable, LAN extension cable, Power supply 5V with 3.1 A max
    Controller(s): SNES Controllers

    So i basically build my pi 3 into the snes case, using an usb hub and extension cables for everything but the power supply. I soldered the corresponding pins from the snes to usb adapter to the board of the original snes controller ports. Now original snes controllers work, and even the power LED works .
    Plugging Controllers into the snes ports works without problems, but if i want to plug in a usb controller, headphones, LAN cable or if i even just touch one of the mentioned ports with a needle, recalbox thinks (i think) that the GPIO pins were set to reset or power off and then shuts down or reboots.
    I think that plugging something in causes a voltage peak vor a very short moment which sets the pins to 1, but thats just me assuming.
    I can avoid the problem, if i plug in USB, LAN, headphones or anything else before i start the console. So booting up with everything plugged in works fine and doesn't make any problems, it only happens if i plug something in while recalbox is all booted up. So i can avoid this problem doing that, everything is fine and i could live with that
    (because USB Controllers/Keyboards/Sticks are the only things i would plug in more often. LAN and Audio Jack for CRT TV, if i were to use them more often, would just be always plugged in before booting). But it's still a little bit annoying.

    The only thing i changed in the recalbox config was uncommenting the line "system.power.switch=PIN356ONOFFRESET".

    After rebooting every other commented lines dissappeared and the PIN356ONOFFRESET line duplicated for whatever reason:
    But i think thats normal since it works like it should

    I already tried to seperate the gpio cables from all the extension cables to make sure they dont touch each other. But it didn't help even with a reasonable distance between them. So i don't think that this was the problem, isolating the pins i used didn't help either.

    So if anybody can help me with that i would be grateful, thanks in advance.

  • Translator
    Translation Master

    @megakoni This problem was already noticed by other people and also happens to me.

    There are some differences to your setup:

    • I don't have any predefined reset, restart, start script active
    • I use some custom scripts written by me
    • It does not happen to my N64 Mod. There I have USB extensions between the RPi3 and the N64 case.

  • @lackyluuk so your custom script did work without this issue? Or is it just luck that it doesn't happen on your n64?
    I don't have any experience in writing scripts like that, so i just used the predefined function

  • Translator
    Translation Master

    @megakoni Actually my scripts are not for shutting down, resetting recalbox etc. They are for checking if the cartridge is inserted and for resetting a game only (not the whole OS). And two others are for controlling a arduino.

    But I never have random reboots if I plug in something. How is the behaviour if you disable the scripts?

  • @lackyluuk ah ok.
    I disabled the power and reset button function, and the shutdown problem dissappears. But after activating again the same issue

  • I think it is a known issue.
    Plugging something USB or LAN sends a little electric signal --> seen as reset or on/off signal by recalbox (when PIN356ONOFFRESET is activated) python script.

    Recalbox devs are working on it, and if I'm not wrong, they are trying to set a timer in order to make recalbox see the difference between a normal RESET (or ON/OFF) signal, and a single electric signal, faultly sent...

  • Translator
    Translation Master

    @unik314r On my second build I also have no ON OFF RESET scripts active but the RPi still reboots if I try to plug in a USB controller..
    Not sure what it causes there.

  • @lackyluuk Indeed... Well, I don't know ^^

  • well if they are really working on it right now, that would be so great. This would make my build almost perfect. I'm looking forward to it, especially now that the updates are more frequent

  • Translator
    Translation Master

    @megakoni @unik314r
    This issue does not seem to be recalbox related. Obviously if you plug in a USB device it causes a sudden pike in current demand to turn the usb device on and due to this the supply current drops and this is like plugging the RPi out and back in.
    Please try a USB extension cable. This could solve your problem because of the extra resistance of the cable to reduce the current pike.

  • @lackyluuk ok i try to connect an usb extension cable between my usb hub and the pi (because the hub is already glued into place), i hope that works, thanks,

    But what if i enable higher current for the usb outputs? wouldn't that avoid the sudden pike, because the needed current is there? I saw somewhere a function to enable it in the config file.

    EDIT: Ok unfortunately the max_usb_current=1 command didn't change a thing. so i just buy one usb extension for between the hub and the pi. I report back after trying

  • Translator
    Translation Master

    @megakoni Is your hub powered by the USB port or does it have a seperate supply? This could help as well.

    There is a fuse which regulates the current to the pi. So it does not matter if you enable more current I think

  • @lackyluuk it's powered by the usb. I think it has a port for a seperate power supply but can't find any fitting cable for that. I try to find out what type of cable i need and if the usb extension doesn't fix this i hope that i can find the cable to buy.

  • so i bought the cables, and unfortunately they didn't help. Bought one 1 meter long one and one cheap and short . Even used both together, no luck.
    And even without using any hub, plugging in something into the original usb ports of the pi also triggers a shutdown.
    Hell even when i plug another device (tried my ps4) to the power supply extension they both share, it shuts down xD

    for the hub i couldn't find a fitting power supply, but i think it wouldn't change anything anyway.

    Thanks for the help anyway, i'll have to avoid this issue by plugging in before booting and just live with that.
    Even if its not recalbox related, maybe they can solve this some day. I mean only the shutdown command comes from recalbox, it's just the signals that are interfered with that current pike. Ignoring micro short signals (maybe) could help.

  • Staff
    Global moderator


    Hi, this is a known problem. A timer has been added to the script (need to push button for more than 1 second).

    This script should be updated in next release.

  • @supernature2k does this fix on/off switches too? Or just the momentary button (in my case reset)?

  • Translator
    Translation Master

    @megakoni Sad to hear that it does not work..
    Are you sure it's a recalbox command which triggers the reboot? Maybe it's a RPi function to shutdown/reboot if VCC drops a certain level? I don't know..
    Because my shutdown / reboot scripts are not active

  • @lackyluuk well, if i turn off the shutdown and reset scripts provided by the recalbox config, that issue dissappears. But i still want to use these buttons so i just have to wait and see if the next update can fix it

  • Staff
    Global moderator

    @megakoni here is the script if you want to test:

    import RPi.GPIO as GPIO
    import time
    import os
    import thread
    import datetime
    import socket
    import sys
    import argparse
    from datetime import datetime
    from configgen import recalboxFiles
    # this last one retrieves emulators bin names
    parser = argparse.ArgumentParser(description='power manager')
    parser.add_argument("-m", help="mode onoff or push", type=str, required=True)
    args = parser.parse_args()
    mode = args.m
    IPADDR = ""
    PORTNUM = 55355
    # IP and port for retroarch network commands
    LED = 14
    GPIO.setwarnings(False)		# no warnings
    GPIO.setmode(GPIO.BCM)		# set up BCM GPIO numbering 
    GPIO.setup(RESETPLUS, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    # GPIO on pin 3 is the GPIO 2 in BCM mode
    #to Reset+
    GPIO.setup(POWERPLUS, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    # GPIO on pin 5 is the GPIO 3 in BCM mode
    #to Power+
    GPIO.setup(LED, GPIO.OUT)
    GPIO.output(LED, True)
    # GPIO on pin 8 is the GPIO 14 in BCM mode
    #to LED+
    # Define a threaded callback function to run in another thread when events are detected  
    def button_pressed(channel):
    	if channel == POWERPLUS:
    		shutdownstring="shutdown -h now"
    	elif channel == RESETPLUS:
    		shutdownstring="shutdown -r now"
    	timer = 0
    	flag = True
    	while flag:
    		if GPIO.input(channel) == False:
    			timer += 1
    			print "Button pressed"
    		elif GPIO.input(channel) == True:
    			print "Button released"
    			print timer
    			#timer adds 1 each 0.1 seconds if timer = 10, button is pressed for 1s
    			if (timer > 10):
    				offreset(speed, shutdownstring)
    				print "shutdown"
    			elif (timer >1):
    				print "retroarch"
    			timer = 0
    			flag = False
    #	on power short press, trying to kill all listed emus 
    def killthatshit(channel):
    	if channel == POWERPLUS:
    		for bin in recalboxFiles.recalboxBins:
    				print bin
    				proc = os.path.basename(bin)
    				print proc
    				os.system("killall -9 "+proc)
    # 	on long button press clean stop	of ES then shutdown -h or -r		
    def offreset(speed, shutdownstring):
    	thread.start_new_thread( blink, (speed, ))
    	pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]
    	os.system("/etc/init.d/S31emulationstation stop")
    	while flag:
    		flag = False
    		for pid in pids:
    					print pid
    					commandpath = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
    					if "emulationstation" in commandpath:
    						flag = True
    				except IOError:
    # threaded blinking function for LED	
    def blink(speed):
    	while True:  
    			GPIO.output(LED, False)
    			GPIO.output(LED, True)
    # 	sending network command to retroarch (only exit and reset atm)		
    def retroarch(nwcommand):
    		s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    	except socket.error:
    		print 'Failed to create socket'
    	s.sendto(nwcommand, (IPADDR, PORTNUM))
    GPIO.add_event_detect(RESETPLUS, GPIO.BOTH, callback=button_pressed, bouncetime=2)
    GPIO.add_event_detect(POWERPLUS, GPIO.BOTH, callback=button_pressed, bouncetime=2)
    while True:

  • @supernature2k how do i implement that? I've never done that. Is here a tutorial for that in the forums?
    And i'm curious about the network commands. Does power/reset only work if my wlan or lan is connected to my network?

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