Hi,
I'm not sure about how a slave read operation is done in I2C communication, so I'll explain the steps, what I understand
so far from documents but please correct me if I'm wrong.
I2C is a communication protocol designed to exchange data between multiple masters and multiple slaves on the same bus.
Slave Write Operation:
1. The master generates a start condition.
2. The master sends the slave address with write mode.
3. If the slave accepts the address, it sends an acknowledgement signal to the master.
4. The master can then send the data, which could be the internal register address of the slave device. If the slave accepts the byte, it sends an acknowledgment to the master.
5. If the master doesn't want to continue sending data, it generates a stop condition.
6. If the slave doesn't accept the data from the master, it sends a not-acknowledgment signal, and the master terminates communication by generating a stop condition.
Slave Read Operation:
1. The master generates the start condition.
2. The master sends the slave address in read mode.
3. If the slave accepts the address, it sends an acknowledgment signal to the master.
4. The master can then send the internal address of the register from which it wants to read data. If the slave accepts the register address, it starts sending the data stored at that address to the master. Master accept data it send acknowledgement to slave
5. If the master wants to read data from another register, it can send the address of that register. If the slave accepts it, it will send the data from the register to the master.
6. If the master doesn't want to read more data, it generates a stop condition to terminate the communication.