在 GPIO.RPi 回调事件中中断 while 循环

Question

我已经尝试解决这个问题好几个小时了，但无济于事。所以，我一直在尝试运行一个 OLED 屏幕来显示天气、时间等。我用 while 循环编写了脚本，这样它几乎可以永远运行。但是，我还希望能够以 GPIO 上拉启动脚本，并以另一个高 GPIO 引脚结束脚本。使用开关脚本启动 OLED 脚本可以完美地处理变量，但脚本似乎对我的“Off-GPIO”试图引入的变量更改视而不见。这是我的代码：

from oledscriptwithfunc import oledfunc
from reset import rstfunc
import RPi.GPIO as GPIO
var = None
def button_callback(channel):
    print("Initializing..")
    oledfunc(2) # set on-off variable to two so while loop can start (see next block of code)
def offbutton(channel):
    print("Ending program..") 
    oledfunc(1) # set on-off variable as off..
    rstfunc()  # reset OLED screen

GPIO.setwarnings(False) 
GPIO.setmode(GPIO.BCM) 
GPIO.setup(10, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) 
GPIO.setup(9, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) 
GPIO.add_event_detect(10,GPIO.RISING,callback=button_callback) # GPIO on "switch"
GPIO.add_event_detect(9,GPIO.RISING,callback=offbutton) # GPIO off "switch"
message = input("Press enter to quit\n")

GPIO.cleanup() 

--------------------------oledscriptwithfunc.py-------------
def oledfunc(var): # function used in previous script, var is set by GPIO
    var = var
    import digitalio
    import threading
    import busio
    import board
    from PIL import Image, ImageDraw, ImageFont
    i2c = busio.I2C(board.SCL, board.SDA)

    import requests
    import adafruit_ssd1306
    oled = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, addr=0x3c)

    oled.fill(0)
    oled.show()
    image = Image.new("1", (128, 32))
    draw = ImageDraw.Draw(image)
    draw.rectangle((0, 0, 128, 32), outline=255, fill=255)
    font = ImageFont.load_default()
    import datetime
    oled.image(image)
    oled.show()
    import time
    timer1 = time.perf_counter()
    while var != 1: # used for on-off toggle
        timer2 = time.perf_counter()
        if int((timer2 - timer1)) in range(0,1) or int((timer2 - timer1)) % 1800 == 0:
            response = requests.get("https://api.openweathermap.org/data/2.5/weather?lat=xxxx&lon=xxxxx&lang=de&units=metric&appid=xxxxxxxxxxxxxxxxxx")
            data = response.json()
            for weatherdata in data['weather']:
                status = weatherdata['description']
            redvar = data['main']
            temp = redvar['temp']
            temptext = "{}C".format(temp)
        
        else:
            while var != 1: # on-off toggle variable
                t_end = time.time() + 10
                while time.time() < t_end:
                    now = datetime.datetime.now()
                    testvar = now.strftime("%d-%m-%Y")
                    vartwo = now.strftime("%M:%S")
                    newvr = int(now.strftime("%H"))
                    newervr = newvr + 2
                    text = testvar + " " + "{}:".format(newervr) + "{}".format(vartwo)
                    draw.rectangle((0, 0, 128, 32), outline=255, fill=255)
                    draw.rectangle((6, 6, 122, 26), outline = 0, fill = 0)
                    (font_width, font_height) = font.getsize(text)
                    draw.text((oled.width//2 - font_width//2, oled.height//2 -  font_height//2),
                            text, font=font, fill=255)
                    oled.image(image)
                    oled.show()
                draw.rectangle((0, 0, 128, 32), outline = 0, fill = 0)
                (font_width, font_height) = font.getsize(temptext)
                draw.text((oled.width//2 - font_width//2, oled.height//2 - font_height//2),
                    temptext, font=font, fill=255)
                oled.image(image)
                oled.show()
                time.sleep(5)
                draw.rectangle((0, 0, 128, 32), outline = 0, fill = 0)
                text = status
                (font_width, font_height) = font.getsize(text)
                draw.text((oled.width//2 - font_width//2, oled.height//2 - font_height//2),
                    text, font=font, fill=255)
                oled.image(image)
                oled.show()
                time.sleep(5)

如果这里有很多错误代码，我深表歉意，我才刚刚开始编程 Python。我希望我已经很好地解释了这个问题。总结一下：使用“var”变量，我希望能够打开和关闭“oledscriptwithfunc.py”。问题是我只能启动它，但再也不能更改变量，所以我可以将其关闭。我评论了代码中最多 important/non-functional 位。请忽略 OLED setup/weather API 调用，我只是想我应该包括它以显示代码的整个内部工作原理。是否存在冲突，或者我只是使用了错误的方法来完成这项工作？

Answer 1

好吧，经过一番修修补补，我找到了解决办法！我发现 RPi.GPIO 有一种使用 input.GPIO(channel) 检查引脚状态的简单方法。 [这给我上了宝贵的一课：始终阅读文档] 我只是做了一些简单的 if 和 while 语句来解决我的问题。这种方式有它自己的注意事项，但它做了我想要它做的事情。

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