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The slave address and R/W bit
The data transmits from a master to a slave through a USB GPIO-I2C-SPI Bus.
The transaction on the USB I2C line begins with the generation of a START condition. A USB I2C slave address is sent in the first byte, as well as the direction for a slave read or write (abbreviated to R/W).
If the eighth bit in the first byte is 0, it indicates the command WRITE and 1 indicates a request READ. A data transfer is terminated by a STOP condition and it is generated by the USB I2C master.
If the USB I2C master wants to continue the communication on the USB-SPI/I2C/GPIO Bus, it can make a repeated START and choose another USB I2C slave address, even if the master has not generated a STOP condition before.
Different combinations of read/write formats are possible within such a transfer.
And here is some possible transfer formats:
- A USB I2C master transmits data to a slave. The direction of the transfer is not changed. The USB-I2C slave-receiver acknowledges each byte.
- A USB I2C master reads data from a slave immediately after the first byte. At the moment, when the slave acknowledges the first byte the master-transmitter becomes the master-receiver and the slave-receiver becomes the slave-transmitter. The USB-I2C master, anyway, generates a STOP condition. It sends a not acknowledge, before the generation of a STOP condition.
- Combined format. In case, the direction of data transfer changes, the START condition and the slave address are repeated, but with the R/W (read / write) bit reversed. If the master, which receives data, wants to generate a START condition, it sends not acknowledge before the repeated START condition.