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

Introducing multi-core and multi-processor systems

First, let's get our terminology straight. A multi-core design is a single chip with multiple CPUs inside it, with at least some memory shared between the cores:

Multi-core parts span a very broad range, from the larger, 64-bit parts that have multiple identical CPU cores to the ARM big.LITTLE architecture, which incorporates both high-bandwidth CPUs and power-conscious MCUs in the same package. Recently, multi-core MCUs have also become more commonly available. Graphics processing units (GPUs) can also be grouped into the multi-core category.

A multi-processor system is one where there are multiple processor chips in the design. For the purposes of our discussions here, these chips can reside on the same printed circuit board assembly (PCBA) or different PCBAs distributed throughout a larger system:

Both multi-core and...