![]() In this case, so-called arbitration happens where each transmitter checks the bus signal level and compares it with expected. It may be a situation when multiple masters try to start a transfer. Each master must wait for the current transmission to be finished and then can initiate the transfer. It doesn’t mean that all masters can transmit data at the same time. It is worth mention that the I2C interface supports multi-master transmission. Slave Receiver – expects for master transmission and accepts data.Slave Transmitter – waits for the master request and then transmits data.Master Receiver – initiates transfer reads data from slave device.Master Transmitter – initiates transfer sends data to the slave device.I2C devices can work in four different modes: If the receiver cannot accept data, it will leave SDA high (NACK), so the master could stop transmitting and do another scenario if needed. The receiver always has to confirm successful receive with ACK by pulling SDA low. Data packet – eight data bits + acknowledge bit Īcknowledge bit is the ninth bit of every byte sent.Address packet – seven address bits lead by data direction bit (read or write) + acknowledge bit.I2C communication packet consists of several parts: So if there is more than one master, each of them has to wait until the current master releases the bus with the STOP signal. The bus is considered to be busy between START and STOP signals.
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