Embedded Basic Communication Protocols

1-SPI: Fast and Simple

SPI stands for Serial Peripheral Interface, and it is a synchronous protocol that uses four wires: clock, master out slave in (MOSI), master in slave out (MISO), and chip select (CS). The master device generates the clock signal and selects the slave device by pulling the CS line low. The master and slave then exchange data by shifting bits on the MOSI and MISO lines. SPI is fast and simple, but it has some drawbacks. It requires more wires and pins than other protocols, and it does not support multiple masters or addressable slaves. You can connect multiple slaves to the same bus, but you need a separate CS line for each one.

Follow this link to learn more : Spi Summary

I2C: Scalable and Flexible

I2C stands for Inter-Integrated Circuit, and it is a synchronous protocol that uses two wires: clock and data. The master device initiates the communication by sending a start condition, followed by an address and a read/write bit. The slave device that matches the address acknowledges the request and sends or receives data. The master then s

ends a stop condition to end the communication. I2C is scalable and flexible, but it has some drawbacks. It is slower than SPI, and it requires pull-up resistors on the clock and data lines. It also has more complex logic and error handling, and it can suffer from bus contention or noise.

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3-UART: Simple and Reliable

UART stands for Universal Asynchronous Receiver/Transmitter, and it is an asynchronous protocol that uses two wires: transmit and receive. The devices communicate by sending bits at a predefined baud rate, with optional start, stop, and parity bits. The devices do not need a common clock signal, but they need to agree on the baud rate and the data format. UART is simple and reliable, but it has some drawbacks. It is slower than SPI and I2C, and it does not support multiple devices on the same bus. You can use a multiplexer or a network protocol like RS-485 to connect more devices, but this adds complexity and cost.

Follow this link to learn more : Uart summary