After reading or writing data, the master will send a stop bit. The slave device does this by pulling down the SDA line. The slave device has to send an acknowledgment after every data transfer. Then the master will read or write data from/to that device. But in the case of Arduino, addresses from 0x00 to 0x07 are reserved so there can be 120 i2c devices (120 LCD is a huge number of displays) with the Arduino.Īfter the master sent the address, a particular device on that address will send an acknowledgment to the master. It // is very possible to leave the bus in a hung state if // no call to endTransmission. // WARNING: Nothing in the library keeps track of whether // the bus tenure has been properly ended with a STOP. Calling endTransmission(false) allows a sketch to // perform a repeated start. So there can be up to 128 different devices using a 7-bit address. // whether or not a STOP should be performed on the bus. From that 8 bit, only first 7 bits are the address and the last bit (LSB) is the read/write signal. The First 8 bits after the start bit is the data address that slave with whom the master wants to communicate. After the start bit, the master sends the data in a sequence of 8 bits. So, all devices on that bus are now ready to read the data coming from the master. To start the i2c communication master send the start bit on the bus. I2c communication protocols (data frames)
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