Book Image

Hands-On RTOS with Microcontrollers

By : Brian Amos
Book Image

Hands-On RTOS with Microcontrollers

By: Brian Amos

Overview of this book

A real-time operating system (RTOS) is used to develop systems that respond to events within strict timelines. Real-time embedded systems have applications in various industries, from automotive and aerospace through to laboratory test equipment and consumer electronics. These systems provide consistent and reliable timing and are designed to run without intervention for years. This microcontrollers book starts by introducing you to the concept of RTOS and compares some other alternative methods for achieving real-time performance. Once you've understood the fundamentals, such as tasks, queues, mutexes, and semaphores, you'll learn what to look for when selecting a microcontroller and development environment. By working through examples that use an STM32F7 Nucleo board, the STM32CubeIDE, and SEGGER debug tools, including SEGGER J-Link, Ozone, and SystemView, you'll gain an understanding of preemptive scheduling policies and task communication. The book will then help you develop highly efficient low-level drivers and analyze their real-time performance and CPU utilization. Finally, you'll cover tips for troubleshooting and be able to take your new-found skills to the next level. By the end of this book, you'll have built on your embedded system skills and will be able to create real-time systems using microcontrollers and FreeRTOS.
Table of Contents (24 chapters)
Section 1: Introduction and RTOS Concepts
Section 2: Toolchain Setup
Section 3: RTOS Application Examples
Section 4: Advanced RTOS Techniques

Understanding abstraction

If our goal is to create a code base that will be usable for a long time, we need flexibility. Source code (just like product feature sets and business tactics) isn't chiseled out of rock—it tends to morph into different forms over time. If our source code is to be flexible, it needs to be able to morph and adapt. Only then will it be able to provide a solid foundation for implementing different feature sets of a product (or entire product lines) as the business landscape driving its development changes. Abstraction is a core tenet of flexibility.

In our context, abstraction means representing a single instance of a complex implementation with a representation that can be applied to many different instances. For example, let's take another look at an earlier example from Chapter 1, Introducing Real-Time Systems:

The diagram itself is...