目前使用官方I2C Maser例程，出现初始化后，SDA一直为0，不知道是什么原因，会导致I2C模块进入BUSY状态，卡在这里，Reg状态为0x0010,不发送数据。当然重新上电可能变为1，这是什么问题。
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MSP430FR4133 I2C 问题
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