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最好的按键扫描和消抖方法，适用于复合、长按、按下或抬起响应按键-智能硬件/嵌入式/...
source link: http://blog.51cto.com/13719208/2107561
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一种按键扫描和消抖的方法，方便移植，适用性强。代码使用STM32演示，但很方便移植到其他平台上。没有刻意使用简洁晦涩的风格，所以代码清晰，移植方便。适用于单线按键、扫描按键，长按按键，多按按键，按下响应，和抬起响应。
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