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

Trying out the code

Now that you've learned how to set up a few tasks, let's go through how to get it running on our hardware. Running the examples, experimenting with breakpoints to observe execution, and sifting through traces in SystemView will greatly enhance your intuition of how an RTOS behaves.

Let's experiment with the preceding code:

  1. Open the Chapter_7 STM32CubeIDE project and set TaskCreationBuild as the active build:
  1. Right-click on the project and select Build Configurations.
  2. Select the desired build configuration (TaskCreationBuild contains main_taskCreation.c).
  3. Select Build Project to build the active configuration.

After that, experiment with using Ozone to load and single-step through the program (details on how to do this were covered in Chapter 6, Debugging Tools for Real-Time Systems). SystemView can also be used to watch the tasks run in...