在gpiozero中模拟“按钮被按下”上升事件

Question

我尝试在没有GPIO的机器上开发一些代码。作为GPIO库，我选择了gpiozero，这样就可以在不访问raspberry pi的gpio的情况下编写代码。我的问题是，我不能在代码中使用.when_pressed事件。我模拟了按钮的状态改变，但是函数没有被调用。

Device.pin_factory = MockFactory()

def interrupt_Event(channel):
   print("%s puted in the queue", channel)

InputPin.Device.pin_factory.pin(channel)
InputPin.when_pressed  = interrupt_Event

def main():
   try:
        while True:

            time.sleep(1)
                    InputPins[channel].pull=drive_high()
                    time.sleep(0.1) 
                    print("State CHANNEL %s" % channel)
                    print(InputPins[channel].state)
                    InputPins[channel].drive_low()

直到现在我都不知道哪里出了问题。

Answer 1

when_pressed函数不应该有参数(参见https://gpiozero.readthedocs.io/en/stable/recipes.html中的2.7 )。

您可以使用循环定义回调:Creating functions in a loop (使用channel=channel强制提前绑定通道值，如下例所示)

for channel in channels:
    def onpress(channel=channel):
        print("%s puted in the queue", channel)
    InputPins[channel].when_pressed = onpress

Answer 2

我不相信您是在使用drive_high和drive_low来模拟按钮推送。我有一个几乎相同的问题。使用Mock pins在windows上开发Pi程序时，我发现回调例程没有被调用。

from gpiozero.pins.mock import MockFactory
from gpiozero import Device, Button, LED
from time import sleep

Device.pin_factory = MockFactory()  # set default pin 
factory

btn = Button(16)

# Get a reference to mock pin 16 (used by the button)
btn_pin = Device.pin_factory.pin(16)

def pressed():       #  callback 
    print('pressed')

def released():       #  callback 
    print('released')    

btn.when_pressed  = pressed  
btn.when_released = released  # callback routine

for i in range(3):           # now try to signal sensor
    print('pushing the button')
    btn_pin.drive_high
    sleep(0.1)
    btn_pin.drive_low
    sleep(0.2)

输出没有回调，只是

pushing the button

pushing the button

pushing the button
>>>