Book Image

Embedded Systems Architecture - Second Edition

By : Daniele Lacamera
5 (1)
Book Image

Embedded Systems Architecture - Second Edition

5 (1)
By: Daniele Lacamera

Overview of this book

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. This book will help you get the hang of the internal working of various components in real-world systems. You’ll start by setting up a development environment and then move on to the core system architectural concepts, exploring system designs, boot-up mechanisms, and memory management. As you progress through the topics, you’ll explore the programming interface and device drivers to establish communication via TCP/IP and take measures to increase the security of IoT solutions. Finally, you’ll be introduced to multithreaded operating systems through the development of a scheduler and the use of hardware-assisted trusted execution mechanisms. With the help of this book, you will gain the confidence to work with embedded systems at an architectural level and become familiar with various aspects of embedded software development on microcontrollers—such as memory management, multithreading, and RTOS—an approach oriented to memory isolation.
Table of Contents (18 chapters)
Part 1 – Introduction to Embedded Systems Development
Part 2 – Core System Architecture
Part 3 – Device Drivers and Communication Interfaces
Part 4 – Multithreading

Designing low-power embedded applications

In this section, a few design patterns are proposed to achieve a better energy profile on the target device, by evaluating the power demand of all the components and the states of the system we are about to design. Once we know how to measure the values in the target, and the details about the low-power mode in the selected architecture and microprocessor family, the application can be programmed, keeping other parameters in mind, such as the energy efficiency of the software we are writing.

Replacing busy loops with sleep mode

The reason busy loops are very popular among hobbyists is that they are so easy to implement. Suppose that the system needs to wait for a digital input to switch to a low-logic state, and this input is mapped to a certain GPIO. This can be easily done with the following one line of code:

while((GPIOX_IDR & (1 << INPUT_PINX)) != 0)

While this is perfectly working as expected, it will...