From device to device, the I2C communication protocol may vary, in the example below, the protocol uses repeated start to read data from or write to the device: For master read: the sequence is: STA,Addr(W),offset,RE-STA,Addr(r),data...STO for master write: the sequence is: STA,Addr(W),offset,RE-STA,Addr(w),data...STO Thus, in state 8, the address is always WRITE. in state 10, the address could be READ or WRITE depending on the I2C command.

i2c.c

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