pi_power.py 文件源码

def user_shutdown_setup(shutdown_pin):
    # setup the pin to check the shutdown switch - use the internal pull down resistor
    GPIO.setup(shutdown_pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

    # create a trigger for the shutdown switch
    GPIO.add_event_detect(shutdown_pin, GPIO.RISING, callback=user_shutdown, bouncetime=1000)

# User has pressed shutdown button - initiate a clean shutdown