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)
1
Part 1 – Introduction to Embedded Systems Development
4
Part 2 – Core System Architecture
8
Part 3 – Device Drivers and Communication Interfaces
13
Part 4 – Multithreading

Measuring power

The current in use by the target can be measured at any time by connecting an ammeter in series with the device. This mechanism, however, does not show all the oscillations of the values during a time interval, which is why it is often useful to sample the values of the parasitic voltage at the ends of a shunt resistor using an oscilloscope.

A shunt resistor is placed in series with the target device, on either side of the power source. Its typical value is relatively small, in the range of a few ohms, to ensure that the parasite voltage stays low, but is still measurable by the oscilloscope:

Figure 8.1 – Measuring the current using an oscilloscope to sample the voltage applied to the shunt resistor

Figure 8.1 – Measuring the current using an oscilloscope to sample the voltage applied to the shunt resistor

Due to the properties of a series circuit, the current running through the shunt is the same as the one used by the target system, so the voltage on the ends of the shunt resistor varies accordingly.

Development boards

In order...