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


In this chapter, we introduced three different ways of implementing low-level drivers that interface with hardware peripherals in the MCU. Interrupts and polled- and DMA-based drivers were all covered through examples and their performance was analyzed and compared using SEGGER SystemView. We also covered three different ways that FreeRTOS can interact with ISRs: semaphores, queues, and stream buffers. Considerations for choosing between the implementation options were also discussed, as well as when it is appropriate to use third-party peripheral drivers (STM HAL) and when "rolling your own" is best.

To get the most out of this chapter, you're encouraged to run through it on actual hardware. The development board was chosen (in part) with the hope that you might have access to Arduino shields. After running through the examples, an excellent next step would...