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GPIO 读取外部状态问题

用GPIO读取外部变化的状态时,外部的变化状态是50HZ,【1010的正弦波】   但读到内部却是111...1000...0,

我推测原因是GPIO采样速率远大于外部变化状态所导致的。但不知道怎么去解决 !  请帮忙