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The-principle-of-self-locking-keys.
- 自锁按键的原理 代码仍用点亮ＬＥＤ那段代码即可，ＩＯ给出高电平让ＬＥＤ常亮，自锁按键实现开光-The principle of self-locking button Code still use that code to turn on the LED, IO LED lit given the high level so that, to achieve self-locking button opening