Adding a 9th button to GPIO

theRog05

Hey guys. It's been a while, but I came back to this post to get my new system set up. I got my two sets of joysticks set up, but my js1 (second set) has an issue. Whenever I press the hotkey button, it shuts down the pi. And if I press it again, it starts back up again. I did a jstest /dev/input/js1 in terminal and all buttons are recognized, but as soon as I hit that hotkey (key 8: even in terminal) the pi turns off. Any clue to what's going on? I am using my same set up, just a new install of retropi. Thanks in advance!

mitu

@therog05 Where did you wire the button - which GPIO pin ? Looks like you connected to the Pin 5 / 6, which are involved in powering on/off the PI - see https://elinux.org/RPI_safe_mode#Wake_from_Halt.5B1.5D.

theRog05

@mitu I'll have to check tomorrow. It used to work fine with my other build and I didn't change any wires around. Maybe something is shorting out? Gotta catch some zzz's right now but I'll check tomorrow.

theRog05

So here's where I'm at:

I started with pulling apart the cabinet to check the wires going to that button. I followed the wires back to the GPIO pins and found that, that button is connected to GPIO3 (Pin 5). Looking at a diagram, there doesn't seem to be anything special with this pin other than it is the HK (hotkey) button for a two person layout (according to RecallBox).

After some digging through folders and files, I found a "shutdown.py" script in the home/pi/scripts folder. I read the code and it shows that the shutdown happens on that pin 5! I got excited that I might have found the problem, so I researched a little and found someone that ran sudo nano /etc/rc.local and commented out sudo python /home/pi/scripts/shutdown.py &. I then rebooted and unfortunately, that didn't work.

So I figured maybe I would just rename the shutdown.py file in case something else was calling it. This also, unfortunately did not work.

Lastly, I noticed that when I pressed that button again while in the terminal, the command logout showed. Is it possible that there is another script out there called "logout", or is it just showing that it's logging out because it ran some shutdown script in the background?

Anyways, I'm at another roadblock with this an was hoping some of you out there might have a solution. Anyways, I hope you're all having a great night and again, thank you so much for your continuous help in this forum.

-Cheers!

mitu

@therog05 I think you have a script running that reboots on PIN5 pull up/down. That being said, you should start with a clean image of RetroPie - we don't supportd 3rd party images - and see if you get the same problem.

theRog05

Thanks for the input, @mitu. I've put a lot of time into what I have right now, so I may spend some more time messing with it. If I don't figure it out, I'll just disable the one hotkey button since I don't really need a player 2 hotkey. I would much rather figure out the problem though. So we shall see. Thanks again.

pmferraro

@simonster said in Adding a 9th button to GPIO:

I have just tried this method and it worked for me completely:

Install MK_Arcade_Joystick from the drivers in the retropie setup. Then exit Emulation Station by pressing F4

rm -r mk_arcade_joystick_rpi
git clone https://github.com/recalbox/mk_arcade_joystick_rpi.git -b hotkeybtn
sudo mkdir /usr/src/mk_arcade_joystick_rpi-0.1.5.1/
cd mk_arcade_joystick_rpi/
nano dkms.conf

change the line that begins PACKAGE_VERSION to read

PACKAGE_VERSION="0.1.5.1"

Press Ctrl+X and then Y and Enter to exit and save changes

sudo cp -a * /usr/src/mk_arcade_joystick_rpi-0.1.5.1/
sudo dkms build -m mk_arcade_joystick_rpi -v 0.1.5.1
sudo dkms install -m mk_arcade_joystick_rpi -v 0.1.5.1 --force

Once installed, restart the Pi using the following command

sudo shutdown -r -t 0 now

WORKS. THANK YOU

theRog05

I'm back at it again. I installed a while new setup but I'm having issues with the kernel headers again. I followed the steps to build and install 0.1.5.1 but I'm getting this error when trying to build...

Error! Bad return status for module build on kernel: 4.19.66-v7+.

Any ideas? Thanks!

mitu

@theRog05 The driver is not compatible with Linux Kernel versions > 4.14 and the Github repository is not updated anymore . The driver version included in RetroPie has this fixed, but it's using the main branch and not the hotkeybtn branch - which I think you might need.
However, RetroPie should still be at kernel version 4.14 - have you used rpi-update to update your installation ?

theRog05

@mitu I have not tried rpi-update yet. I can do that now.

mitu

@theRog05 I wasn't suggesting to use that, since it will upgrade your Linux Kernel. What version of RetroPie are you using ?

theRog05

@mitu oh. Gotcha. I won't do that then.

theRog05

@mitu I'm at a loss here. Maybe I should reflash the SD card? I was at one point getting an error saying "kernel headers for 4.14.79-v7+ cannot be found" when trying to run this command sudo dkms build -m mk_arcade_joystick_rpi -v 0.1.5.1

theRog05

@mitu currently running RetroPie version 4.4.4

mitu

@theRog05 If you're re-starting again, then get the 4.5.1 image from https://retropie.org.uk/download, which should have the necessary pre-requisites installed.