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Listen for GPIO input from a raspberry pi - open menu and power off
# Import the RPi.GPIO and OS
import RPi.GPIO as GPIO
import os
import sys
import time
# GPIO port setup
GPIO.setmode(GPIO.BCM)
# Power switch: will send a shutdown message to the OS
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# Reset switch: will look for a running emulator process, and send it an interrupt signal
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# Looks for an emulator process and send an interrupt signal if found
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
# Sends a poweroff command to the OS
def powerOff(channel):
print('poweroff')
os.system('poweroff')
# Here we just wire the GPIO inputs to their respective callback functions
GPIO.add_event_detect(17, GPIO.RISING, callback=powerOff, bouncetime=500)
GPIO.add_event_detect(18, GPIO.RISING, callback=exitEmulator, bouncetime=500)
# And... nothing more to do. let's wait.
while True:
time.sleep(10)
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