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

Task Signaling and Communication Mechanisms

In the previous chapter, the task was introduced. Toward the end, we looked at examples of preemptive scheduling for multiple tasks in the system and the fact that a task will run whenever it isn't waiting on something (in the blocked state) and can do something useful. In this chapter, the core mechanisms for task signaling and inter-task communication will be briefly introduced. These primitives are fundamental to event-driven parallel programming, which is the foundation of a well implemented RTOS-based application.

Rather than dive right into the FreeRTOS API, each primitive will be presented along with a few graphical examples and some suggestions on when each of the mechanisms can be used. Don't worry: in later chapters, we'll get into the nitty-gritty of working with the API. For now, let's concentrate on the...