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Hands-On RTOS with Microcontrollers

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

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Product type Paperback
Published in May 2020
Publisher Packt
ISBN-13 9781838826734
Length 496 pages
Edition 1st Edition
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Author (1):
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Brian Amos Brian Amos
Author Profile Icon Brian Amos
Brian Amos
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Table of Contents (24) Chapters Close

Preface 1. Section 1: Introduction and RTOS Concepts
2. Introducing Real-Time Systems FREE CHAPTER 3. Understanding RTOS Tasks 4. Task Signaling and Communication Mechanisms 5. Section 2: Toolchain Setup
6. Selecting the Right MCU 7. Selecting an IDE 8. Debugging Tools for Real-Time Systems 9. Section 3: RTOS Application Examples
10. The FreeRTOS Scheduler 11. Protecting Data and Synchronizing Tasks 12. Intertask Communication 13. Section 4: Advanced RTOS Techniques
14. Drivers and ISRs 15. Sharing Hardware Peripherals across Tasks 16. Tips for Creating a Well-Abstracted Architecture 17. Creating Loose Coupling with Queues 18. Choosing an RTOS API 19. FreeRTOS Memory Management 20. Multi-Processor and Multi-Core Systems 21. Troubleshooting Tips and Next Steps 22. Assessments 23. Other Books You May Enjoy

Achieving parallel operations with RTOS tasks

Earlier, we had looked at a super loop that was looping through three functions. Now, for a very simple example, let's move each one of the three functions into its own task. We'll use these three simple tasks to examine the following:

  • Theoretical task programming model: How the three tasks can be described theoretically
  • Actual round-robin scheduling: What the tasks look like when executed using a round-robin scheduling algorithm
  • Actual preemptive scheduling: What the tasks look like when executed using preemptive scheduling
In real-world programs, there is almost never a single function per task; we're only using this as an analog to the overly simplistic super loop from earlier.

Theoretical task programming model

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