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我想问一下I2C的从机，怎么去判别主机要读取从机的数据？手册上说是从机地址与其主机寻找的地址相同，然后判断主机发送的R/W 的值，从机怎么判断R/W的值？手册上没有找到R/W的相关寄存器。
主机执行i2c_read语句时会去把TXR=0,表示R/W的值，建议看一下下面的应用报告，里面有i2c_read函数的流程图。 www.ti.com/.../spra785a.pdf
从机的配置请参考下面的TRM。9.2.12.2 Configuring the I2C in Slave Receiver and Transmitter Modewww.ti.com/.../spruh87h.pdf
