python - RPi.GPIO中wait_for_edge和event_detected有什么區別？

問題描述

比如說我要監聽一個下降沿觸發的中斷請求，并且執行一段函數，究竟該怎么寫代碼，網上各種文檔都是互相抄襲國外的機翻文檔，完全無法正常閱讀，請各位高手幫忙解答一下，謝謝?。?！

問題解答

The wait_for_edge() function is designed to block execution of your program until an edge is detected.

翻譯過來就是wait_for_edge會阻塞程序，直到有一個邊沿事件被觸發

The event_detected() function is designed to be used in a loop with other things, but unlike polling it is not going to miss the change in state of an input while the CPU is busy working on other things.

event_detected就是事件觸發

具體到你這里，要中斷請求，那只能是用事件方式觸發了。

那第一步是讓接口電阻上拉

GPIO.setup(channel, GPIO.IN, pull_up_down=GPIO.PUD_UP)

然后

GPIO.add_event_detect(channel, GPIO.FALLING)GPIO.add_event_callback(channel, callback_func)