Python等待按下按钮(多个输入)

Question

我目前正在考虑向我的脚本中添加另一个按钮。目前，它正在全屏显示我的视频(相机)的输出，直到检测到按下按钮，然后它才会执行某些操作。这看起来像这样我这样做了:

while True:
        camera.preview_fullscreen = True
        camera.preview_alpha = 128
        camera.start_preview()
        GPIO.wait_for_edge(picture_pin, GPIO.FALLING)
        action()

但是，我现在想介绍另一个执行不同操作的按钮。因此，我想加入这个:

import RPi.GPIO as GPIO

actionpin1 = 23
actionpin2 = 24

GPIO.setmode(GPIO.BCM)
GPIO.setup(actionpin1, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(actionpin2, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def action1():
        print "button pressed 1"

def action2():
        print "button pressed 2"

while True:
        print "waiting for button"
        GPIO.add_event_detect(actionpin1, GPIO.BOTH, callback=action1, bouncetime=800)
        GPIO.add_event_detect(actionpin2, GPIO.BOTH, callback=action2, bouncetime=800)

但是，它给了我这个错误:

Traceback (most recent call last): File "test.py", line 19, in GPIO.add_event_detect(actionpin1, GPIO.BOTH, callback=action1, bouncetime=800) RuntimeError: Conflicting edge detection already enabled for this GPIO channel

这个错误与我读到的关于这个函数的内容冲突，所以我不确定为什么它会给我这个错误。谁能指出我正确的方向？

Answer 1

将 add_event_detect 方法放在 While 循环之外，这没有用，因为在检测到事件时会调用回调函数:

import RPi.GPIO as GPIO

actionpin1 = 23
actionpin2 = 24

GPIO.setmode(GPIO.BCM)
GPIO.setup(actionpin1, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(actionpin2, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.add_event_detect(actionpin1, GPIO.BOTH, callback=action1,bouncetime=800)
GPIO.add_event_detect(actionpin2, GPIO.BOTH, callback=action2, bouncetime=800)

def action1():
    print "button pressed 1"

def action2():
    print "button pressed 2"

while True:
    print "waiting for button"