Shutdown on single button press

danhans42 · July 19, 2018 at 2:24 PM

Hi All,

I am looking to use a Raspberry Pi3B+ in my car. I have designed and built a circuit that handles the power management and am using gpio-shutdown and gpio-poweroff dtoverlays, which seem to be doing what they are supposed to (they are now included in the LE9 test builds) , other than one thing...

When I use the gpio that I have assigned to shutdown, I get the shutdown dialog come up. Usually this would be fine, but I want it to actually shutdown, not prompt to ask me to do it.

I assume basically what I am wanting to do is to actually shutdown on a single keypress. is this something that can be done easily - Its probably more of a Kodi question rather than Libreelec but thought I would try here first.

Thanks

**HiassofT** · July 19, 2018 at 5:10 PM

This can be changed easily with a kodi keyboard.xml file. Just map the "power" key to "ShutDown()" - the default is "ActivateWindow(ShutdownMenu)".

Keymap - Official Kodi Wiki

so long,

Hias

**Iridium** · July 19, 2018 at 5:58 PM Official Post

I've used gpio-shutdown on Raspbian without issues - I would firstly only use the shutdown overlay as both together may be conflicting. Also by using the standard default setup of GPIO 3 - gpio-shutdown allows a boot by toggling the GPIO again.

I'll try tomorrow to see what the issue is, as it should shutdown the RPi without intervention (Well that's my interpretation of the driver) . Maybe some dev rule is forcing this to display the shutdown menu instead of a poweroff.

danhans42 · July 20, 2018 at 7:45 AM

HI,

Thanks for the replies. I thought I needed the poweroff overlay also, as this pin stays high whilst the RPi is running and then goes low on shutdown - I use this to switch power off once the RPI has shutdown.

I will give the keyboard.xml modification a try and see if that works.

Thanks for the help so far, this is the last niggle I need to sort before I can install it in the vehicle.

**Iridium** · July 20, 2018 at 11:34 AM Official Post

It looks like all gpio-shutdown does is send the keystoke "KEY_POWER" to Kodi - which is what you are seeing with the shutdown menu. So it looks like the remapping is the best solution.

gpio-poweroff doesn't seem to be implemented (yet).

**Iridium** · July 20, 2018 at 12:47 PM Official Post

I've been having a play - and this might work for you.

Install Raspberry Pi tools add-on in LE Repository.

Create /storage/.config/autostart.sh

Code

(
python /storage/off-button.py
) &

Save and make executable chmod +x autostart.sh (Obviously change location to where you'll keep your scripts)

Create /storage/off-button.py (This is based on dtoverlay-shutdown using GPIO 3)

Python

#!/usr/bin/python
#This script was authored by AndrewH7 and belongs to him (www.instructables.com/member/AndrewH7)#You have permission to modify and use this script only for your own personal usage#You do not have permission to redistribute this script as your own work#Use this script at your own risk
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
import RPi.GPIO as GPIO
import os

gpio_pin_number=3
#Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use
#Make sure you know which rapsberry pi revision you are using first
#The line should look something like this e.g. "gpio_pin_number=7"

GPIO.setmode(GPIO.BCM)
#Use BCM pin numbering (i.e. the GPIO number, not pin number)
#WARNING: this will change between Pi versions#Check yours first and adjust accordingly

GPIO.setup(gpio_pin_number, GPIO.IN, pull_up_down=GPIO.PUD_UP)
#It's very important the pin is an input to avoid short-circuits
#The pull-up resistor means the pin is high by default
try:
    GPIO.wait_for_edge(gpio_pin_number, GPIO.FALLING)
    #Use falling edge detection to see if pin is pulled
    #low to avoid repeated polling
    os.system("shutdown -h now")
   #Send command to system to shutdown
except:
    pass
GPIO.cleanup()
#Revert all GPIO pins to their normal states (i.e. input = safe)

Display More

Reboot and a hard switch will poweroff the RPi within 5/10 seconds

danhans42 · July 20, 2018 at 8:20 PM

Quote from Iridium

It looks like all gpio-shutdown does is send the keystoke "KEY_POWER" to Kodi - which is what you are seeing with the shutdown menu. So it looks like the remapping is the best solution.

gpio-poweroff doesn't seem to be implemented (yet).

Wierd really, as its currently doing what I want it to (I have it set to pull GPIO5 high when its running, and low when shutdown is complete). Below is what I have in my config.txt

Code

#Overlay for GPIO Shutdown
dtoverlay=gpio-shutdown,gpio_pin=26
dtoverlay=gpio-poweroff,gpiopin=5,active_low=1

I will give the keyboard mapping a go, and if that doesn't yield the desired result I will try the script you have linked above. I have an arduino handling this externally, so it will (eventually) shut down after the ignition key being off for 10 minutes - which is long enough for one of my fuel station visits.

Thanks for the pointers so far. Very helpful. I will post back with my results.

Cheers

**HiassofT** · July 20, 2018 at 9:05 PM

A couple of months ago I tested with the gpio-shutdown dtoverlay on LE9 and it worked as expected (power off and on by a button on GPIO3) -no need for any additional python scriptery.

I haven't used the gpio-poweroff dtoverlay yet, but if it doesn't work please drop me a line and I'll look into it.

so long,

Hias

danhans42 · July 21, 2018 at 8:52 AM

Thanks for the help, now working perfectly..

I put the following in keyboard.xml in the keymap folder...

XML

<?xml version="1.0" encoding="UTF-8"?>
<keymap>
  <global>
    <keyboard>
      <key id="61662">Shutdown</key>
    </keyboard>
</global>

Now it shuts down. Also, with the config settings I placed in the earlier post, GPIO5 goes low once shutdown is complete.

Works perfect. Thanks for all the help!