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TMS320F28069F: 28069直接读取IO口电平状态为什么不成功?高电平读出来一直是0但查看寄存器的值是1

Part Number: TMS320F28069F

 在读取IO口电平状态前需要有什么注意的吗?IO口初始化为IO、上拉、输入。