You're reading from Hands-On RTOS with Microcontrollers Create high-performance, real-time embedded systems using FreeRTOS, STM32 MCUs, and SEGGER debug tools

Product type Paperback

Published in Sep 2025

Publisher Packt

ISBN-13 9781803237725

Length 570 pages

Edition 2nd Edition

Languages

Concepts

Operating Systems

Authors (2):

Jim Yuill

Penn Linder

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Table of Contents (27) Chapters

Preface

1. Part 1: Introduction to RTOSes, the Dev-Board, and Tools

2. Introducing Real-Time Systems FREE CHAPTER

3. Introducing the Development Board

4. Introducing the Development-Tools

5. Understanding Super-Loops

6. Implementing the Super-Loop

7. Part 2: The FreeRTOS Scheduler, Tasks, and Primary APIs

8. Understanding RTOS Tasks

9. Running the FreeRTOS Scheduler

10. Protecting Data and Synchronizing Tasks

11. Intertask Communication

12. Part 3: Using FreeRTOS to Build Systems

13. Drivers and ISRs

14. More Efficient Drivers and ISRs

15. Sharing Hardware Peripherals among Tasks

16. Creating Loose Coupling with Queues

17. Part 4: System Design and Troubleshooting

18. FreeRTOS Memory Management

19. Multi-Processor and Multi-Core Systems

20. Troubleshooting Tips and Next Steps

21. Part 5: Reference Information and FreeRTOS Installation

22. Other Books You May Enjoy

23. Index

Appendix A: Tools Quick-Reference

1. Appendix B: Reference Information

2. Appendix C: Creating FreeRTOS Projects, and Installing FreeRTOS

Creating Loose Coupling with Queues

In this chapter, we’ll explore how queues can provide natural interface definitions for data exchange between tasks.

We’ll create a system that uses the dev-board and development computer, connected by USB. An app on the development computer sends commands to our firmware on the dev-board. The commands specify how to set the brightness for the user LEDs. The app on the development computer is a GUI, and it allows the user to set the brightness for each LED.

In the prior chapter, we created a driver for sending data over USB, to the development computer. In this chapter we’ll use the driver to receive data over USB, from the development computer. The driver puts the received data in a stream-buffer. The received data is a series of commands for setting the brightness of the dev-board’s user LEDs. A task is implemented to parse the stream-buffer to extract the commands. Each extracted command is sent to a queue...