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如何能实现引脚中断的延时？比如由按键中断控制灯，当长按3s，灯亮。按键不到3s灯不亮，返回主程序继续。
楼主你好！
可以使用timer的capture模块实现，将按键信号输入cap引脚，计算高电平的时间。
