What are registers in I2C?

What are registers in I2C?

Devices connected to an I2C bus will often have registers where data values are set as status or action requests. Each register has an index so a register write operation can put the data value in the correct place. Registers are like mailslots at a post office that hold a single number value.

Which library is used to communicate with I2C module?

Wire Library. This library allows you to communicate with I2C / TWI devices.

Is I2C full duplex?

I2C is half-duplex communication and SPI is full-duplex communication. I2C supports multi-master and multi slave and SPI supports single master. I2C is a two-wire protocol and SPI is a four-wire protocol.

What two things can a Nack mean I2C?

When the line remains high during the next clock cycle, it is considered a NACK. This can mean one of several things: A NACK after an address is sent means no slave responded to that address. A NACK after write data means the slave either did not recognize the command, or that it cannot accept any more data.

Which is faster I2C or UART?

I2C is also generally faster than UART, and can reach speed of up to 3.4 MHz. Some drawbacks are that UART doesn’t offer multiple master/slave support, which can limit how many devices are used on the bus. Additionally, each UART baud rate should be in 10% of each other or else data can be corrupted.

How to ask a serial power I2C question?

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Can a powerbank IC be used as an I2C?

I am using the SW6106 powerbank IC as an I2C but no matter what I have tried I couldn’t read something other than “FF”. Datasheet for the IC.

How can I tell which register I want to read?

It seems the only way to say which register you want to read is to complete an I2C write sequence using that register’s address. Probably the “Command Data” you use in the write sequence will be irrelevant if you use the address of a read register.

Do you need to do a read sequence every time you read a register?

It is usual in many chips to access subsequent register addresses incrementally by just issuing new read sequences. This way you could do a bulk or multi-byte read. However I’m not sure that’s the case here, so you might need to do the write sequence every time.