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Listen for GPIO input from a raspberry pi - open menu and power off
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# 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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http://www.instructables.com/id/Raspberry-Pi-Launch-Python-script-on-startup/