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| #!/usr/bin/env python
# coding=utf-8
# author:ksc
import RPi.GPIO as GPIO
import time
import os,sys
import signal
GPIO.setmode(GPIO.BCM)
#define GPIO pin
pin_btn=7
pin_led=17
GPIO.setup(pin_btn, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(pin_led, GPIO.OUT, initial=GPIO.LOW)
press_time=0
count_down=10
led_on=1
def cleanup():
'''释放资源，不然下次运行是可能会收到警告
'''
print('clean up')
GPIO.cleanup()
def handleSIGTERM(signum, frame):
#cleanup()
sys.exit()#raise an exception of type SystemExit
def onPress(channel):
global press_time,count_down
print('pressed')
press_time+=1
if press_time >3:
press_time=1
if press_time==1:
GPIO.output(pin_led, 1)
print('system will restart in %s'%(count_down))
elif press_time==2:
print('system will halt in %s'%(count_down))
elif press_time==3:
GPIO.output(pin_led, 0)
print 'cancel '
count_down=10
GPIO.add_event_detect(pin_btn, GPIO.FALLING, callback= onPress,bouncetime=500)
#signal.signal(signal.SIGTERM, handleSIGTERM)
try:
while True:
if press_time==1:
if count_down==0:
print "start restart"
os.system("shutdown -r -t 5 now")
sys.exit()
led_on=not led_on
GPIO.output(pin_led, led_on)# blink led
if press_time==2 and count_down==0:
print "start shutdown"
os.system("shutdown -t 5 now")
sys.exit()
if press_time==1 or press_time==2:
count_down-=1
print "%s second"%(count_down)
time.sleep(1)
except KeyboardInterrupt:
print('User press Ctrl+c ,exit;')
finally:
cleanup()
|
