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再补充一下：第一次读到的值为更新之前的的值。第二次才是正确的值
16个口如配置成输入
当有高低电平进来也要读2次才能读到正确的值
在线等，希望牛人们回复下
2、设置I/O 0为高电平 ------ 把这步重复2次试试？
