timeserver.py 文件源码

def shutdown(channel):
    """
    Calls system shutdown after a button press of more than 2 seconds
    """
    GPIO.remove_event_detect(channel)
    pressed_timestamp = datetime.datetime.now()
    while not GPIO.input(channel):
        time.sleep(.5)
    dif = datetime.datetime.now() - pressed_timestamp
    pressed_time = dif.seconds
    logging.debug('Pressed time = %s', pressed_time)
    if pressed_time > 2:
        logging.info('Button initiated shutdown')
        os.system("sudo shutdown -h now")
    GPIO.add_event_detect(channel, GPIO.FALLING, callback=shutdown, bouncetime=200)

# Add button pressed event detects