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Hands-On RTOS with Microcontrollers

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

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Product type Paperback
Published in Sep 2025
Publisher Packt
ISBN-13 9781803237725
Length 570 pages
Edition 2nd Edition
Languages
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Authors (2):
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Jim Yuill Jim Yuill
Author Profile Icon Jim Yuill
Jim Yuill
Penn Linder Penn Linder
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Penn Linder
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Toc

Table of Contents (27) Chapters Close

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

Task implementation and troubleshooting

This section presents several topics related to task implementation, and to troubleshooting task startup problems.

Task memory allocation

One of the things we glossed over previously was why a call to xTaskCreate() can fail. That’s an excellent question – let’s find out!

One of the parameters for xTaskCreate() defines the task’s stack size. But where does the RAM for this stack come from? There are two options – dynamic allocation of memory and static allocation of memory.

Dynamic allocation of memory is implemented with a heap. FreeRTOS contains several different heap implementations. FreeRTOS heaps will be explained later. For now, it is sufficient to assume a heap is available.

Static allocation of memory permanently reserves RAM for data, for the life of the program. Let’s see what each approach looks like.

Dynamically allocated tasks

Our example-program has two calls...

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