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

Choosing an RTOS API

So far, we've only used the native FreeRTOS API in all of our examples. However, this isn't the only API available for using FreeRTOS. Sometimes, there are secondary goals when developing code – it might need to be reused across other projects with other MCU-based embedded operating systems. Other times, code needs to be interoperable with fully featured operating systems. You may also want to utilize code that has been previously developed for a full operating system. In order to support these goals, there are two other APIs for FreeRTOS that are worth considering alongside the native API – CMSIS-RTOS and POSIX.

In this chapter, we'll investigate the features, trade-offs, and limitations of these three APIs when creating applications based on FreeRTOS.

This chapter covers the following topics:

  • Understanding generic RTOS APIs...