python - RPi.GPIO中wait_for_edge和event_detected有什么区别？

问题描述

比如说我要监听一个下降沿触发的中断请求，并且执行一段函数，究竟该怎么写代码，网上各种文档都是互相抄袭国外的机翻文档，完全无法正常阅读，请各位高手帮忙解答一下，谢谢！！！

问题解答

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

翻译过来就是wait_for_edge会阻塞程序，直到有一个边沿事件被触发

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就是事件触发

具体到你这里，要中断请求，那只能是用事件方式触发了。

那第一步是让接口电阻上拉

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)