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

Creating tasks and starting the scheduler

In order to get an RTOS application up and running, a few things need to happen:

  1. The MCU hardware needs to be initialized.
  2. Task functions need to be defined.
  3. RTOS tasks need to be created and mapped to the functions that were defined in step 2.
  4. The RTOS scheduler must be started.
It is possible to create additional tasks after starting the scheduler. If you are unsure of what a task is, or why you would want to use one, please review Chapter 2, Understanding RTOS Tasks.

Let's break down each of these steps.

Hardware initialization

Before we can do anything with the RTOS, we need to make sure that our hardware is configured properly. This will typically include carrying out activities...