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使用场景是这样子的，系统休眠时候，PA3设置为按键中断输入，如果是按键唤醒，则不初始化串口，一直长按直到时间达到进入另外一种模式。如果中间松掉按键或者是非按键唤醒，则初始化PA3为串口功能，应该要怎样设置这个复用功能？