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利用GPIO模拟I2C总线来操作EEPROM时，初始化时将GPIO配置为输出，操作EEPROM时，重新配置EEPROM时钟线的GPIO的方向寄存器（仍配置输出）时，导致操作EEPROM失败，请问这是为什么？配置方向寄存器会产生干扰？
设置时使用EALLOW 和EDIS 保护了吗
