The architecture of the system depends on the way the scheduler is implemented. Tasks can be running in a cooperative model, until they voluntarily decide to yield the CPU to the next task, or the OS can decide to trigger an interrupt to swap the running task behind the scene, applying a specific policy to decide the interval in between task switches and the priority for the selection of the next task. In both cases, the context switch happens within one of the supervisor calls available, set to decide which tasks to schedule next, and to perform the context switch. In this section, the full context switch procedure through the PendSV is added to the example, and then a few of the possible scheduling policies are analyzed and implemented.
Embedded Systems Architecture
By :
Embedded Systems Architecture
By:
Overview of this book
Embedded systems are self-contained devices with a dedicated purpose. We come across a variety of fields of applications for embedded systems in industries such as automotive, telecommunications, healthcare and consumer electronics, just to name a few.
Embedded Systems Architecture begins with a bird's eye view of embedded development and how it differs from the other systems that you may be familiar with. You will first be guided to set up an optimal development environment, then move on to software tools and methodologies to improve the work flow. You will explore the boot-up mechanisms and the memory management strategies typical of a real-time embedded system. Through the analysis of the programming interface of the reference microcontroller, you'll look at the implementation of the features and the device drivers. Next, you'll learn about the techniques used to reduce power consumption. Then you will be introduced to the technologies, protocols and security aspects related to integrating the system into IoT solutions.
By the end of the book, you will have explored various aspects of embedded architecture, including task synchronization in a multi-threading environment, and the safety models adopted by modern real-time operating systems.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Free Chapter
Embedded Systems – A Pragmatic Approach
Work Environment and Workflow Optimization
Architectural Patterns
The Boot-Up Procedure
Memory Management
General-Purpose Peripherals
Local Bus Interfaces
Low-Power Optimizations
Distributed Systems and IoT Architecture
Parallel Tasks and Scheduling
Embedded Operating Systems
Other Books You May Enjoy
Index
Customer Reviews