![]() ![]() The message also includes start and stop conditions, read/write bits from either the master or slave, and ACK/NACK bits sent from the receiver for error checking. When sending data over the bus, each I2C message includes an address frame of the slave device and one or more data frames containing the data being transmitted. To accomplish this, all slave devices must have a unique address that is included in the I2C message. A master device will signal to a slave in order to send data or request a response. ![]() In I2C operations, the master controls the exchange of data between the devices. It is a bidirectional two-wire serial bus that uses serial clock (SCL) and serial data (SDA) wires to send and manage data bit by bit between devices connected to the bus. I2C, or Inter-Integrated Circuit, is a simple communication protocol often used in embedded systems as a way to transfer data between a master (or multiple masters) and a single slave (or multiple slaves) device. Understanding I2C and SPI Communication Protocols I2C Protocol ![]() While they all accomplish a similar goal of sending data, they each have many differences as well as advantages and disadvantages to consider when choosing which to use.įirst, we will provide a high-level overview of each of the I2C, SPI, and UART protocols and then provide a comparison between them. I2C, SPI, and UART are commonly used as means for communication between devices within an embedded system due to their simplicity and ease of operation. ![]()
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