Table of Contents
Serial communication is a fundamental method used in embedded systems to transfer data between devices. It involves sending data one bit at a time over a single communication line, making it simple and efficient for many applications. Understanding the theory, practical implementation, and calculations involved is essential for designing reliable systems.
Basics of Serial Communication
Serial communication can be classified into two main types: asynchronous and synchronous. Asynchronous communication does not require a shared clock signal, relying instead on start and stop bits to frame data. Synchronous communication, on the other hand, uses a clock signal to synchronize data transfer, allowing higher data rates and more efficient communication.
Practical Implementation
In embedded systems, UART (Universal Asynchronous Receiver/Transmitter) is a common hardware module used for serial communication. Configuring UART involves setting parameters such as baud rate, data bits, parity, and stop bits. Proper configuration ensures data integrity and compatibility between devices.
Calculations for Serial Communication
Calculating the baud rate is essential for reliable data transfer. The baud rate determines how fast data is sent over the line. The formula for baud rate calculation often depends on the system clock and UART settings:
Baud Rate = System Clock / (16 × Baud Rate Register)
For example, with a system clock of 16 MHz and a desired baud rate of 9600, the register value can be calculated as:
Register Value = System Clock / (16 × Baud Rate)
which results in a register value of approximately 104.