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Which is the repeated START condition in I2C?
This has to be done without the risk of another (multimaster) device interrupting this atomic operation. The I2C protocol defines a so-called repeated start condition. After having sent the address byte (address and read/write bit) the master may send any number of bytes followed by a stop condition.
How does the I2C master read from the Register?
In applications with audio codecs or sensors that have a complex register set, the I2C master must first send the register address and then read data out from that register instead of simply reading from the device using its call address and setting the direction bit to “read”.
Can a Master send a repeated START condition?
After having sent the address byte (address and read/write bit) the master may send any number of bytes followed by a stop condition. Instead of sending the stop condition it is also allowed to send another start condition again followed by an address (and of course including a read/write bit) and more data.
Do you send a second stop in I2C?
So in the case of a restart you don’t send a second Stop. As far as the 0xFF read result is concerned, you need to check the datasheet of the device, but some will return this value if the data you are trying to read is not available, yet! Hope this helps.
What are the roles of Masters and slaves in I2C?
Masters and Slaves play important role in I2C communication. Master is the one which initiates a communication, generates a clock and terminates the communication and Slave is the one which is handled by master and acts according to the master command. It can also be possible that multiple masters can communicate with multiple slaves.
What do you need to know about the I2C protocol?
The inter-integrated circuit or I2C Protocol is a way of serial communication between different devices to exchange their data with each other. It is a half-duplex bi-directional two-wire bus system for transmitting and receiving data between masters (M) and slaves (S). These two wires are Serial clock line or SCL and Serial data line or SDA.