三分钟理解ESP32 嵌入式开发核心:中断
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在这个视频中,我们将解开嵌入式编程中一个非常核心的概念——中断 (Interrupt)。 如果在主循环里使用 delay() 或者执行耗时任务,按键常常会“失灵”或者反应迟钝,这是为什么?我们通过一个生动的“厨师切菜与灭火”的比喻,带你理解 CPU 是如何通过中断机制来处理紧急任务的。 本期视频你将学到: ✅ 轮询 (Polling) vs 中断 (Interrupt):为什么一直问“按了吗”效率很低? ✅ ESP32 代码实战:如何使用 attachInterrupt 函数及 digitalPinToInterrupt。 ✅ ISR (中断服务程序):编写中断函数的三个黄金法则。 ✅ 避坑指南:为什么中断函数必须“快进快出”?看门狗 (Watchdog) 是如何工作的? ✅ 多任务假象:揭秘手机和电脑是如何“同时”处理几百个任务的。 如果你正在学习 Arduino 或 ESP32 开发,理解中断机制将让你的代码效率倍增!别忘了点赞订阅,并在评论区分享你的看法。 📌 涉及代码/函数: attachInterrupt(pin, ISR, mode) digitalPinToInterrupt(pin) RISING / FALLING / CHANGE ISR (Interrupt Service Routine) 3. 时间戳 (Timestamps) 00:00 视频介绍:今天要解锁的核心概念——中断 00:14 硬件搭建:ESP32、按键与 LED 的连接 00:25 传统方法的缺陷:为什么“轮询”会让按键失灵? 00:54 生动比喻:厨师切菜(CPU)与灭火器(中断) 01:25 代码实战:如何编写 setup 中的中断配置 01:36 attachInterrupt 的三个关键参数详解 01:50 参数一:引脚映射 (digitalPinToInterrupt) 02:00 参数二:回调函数命名规则 02:10 参数三:触发模式 (Falling Edge 下降沿) 02:30 揭秘多任务处理:CPU 是如何骗过你的眼睛的? 03:08 核心原则:中断函数 (ISR) 必须快进快出 03:22 翻车演示:在中断里延时会发生什么?(看门狗崩溃) 03:55 总结与下期预告
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