Book Image

Raspberry Pi Computer Architecture Essentials

By : Andrew K. Dennis, Teemu O Pohjanlehto
Book Image

Raspberry Pi Computer Architecture Essentials

By: Andrew K. Dennis, Teemu O Pohjanlehto

Overview of this book

With the release of the Raspberry Pi 2, a new series of the popular compact computer is available for you to build cheap, exciting projects and learn about programming. In this book, we explore Raspberry Pi 2’s hardware through a number of projects in a variety of programming languages. We will start by exploring the various hardware components in detail, which will provide a base for the programming projects and guide you through setting up the tools for Assembler, C/C++, and Python. We will then learn how to write multi-threaded applications and Raspberry Pi 2’s multi-core processor. Moving on, you’ll get hands on by expanding the storage options of the Raspberry Pi beyond the SD card and interacting with the graphics hardware. Furthermore, you will be introduced to the basics of sound programming while expanding upon your knowledge of Python to build a web server. Finally, you will learn to interact with the third-party microcontrollers. From writing your first Assembly Language application to programming graphics, this title guides you through the essentials.
Table of Contents (18 chapters)
Raspberry Pi Computer Architecture Essentials
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Adding power to our program – control structures


Within programming languages, control structures are one of the most useful features. They allow us to say things such as the following:

  • If this action happens then do this, otherwise do this

  • Keep doing this until some condition is met

The most common control structures you may be familiar with are the if and else statements.

As with C and Python, we can implement a control structure like this in Assembly language.

Also included in control structures are loops. You may have seen these in the format of the for loop and while loop.

The following program demonstrates how we can implement iteration via loops and if else structures in Assembly language via branching.

We will be building upon our previous program where we introduced you to the SUB command, and will also explore some new commands including CMP and BLT.

Create a new file called fourth_assem_prog.s in the assem_programs directory.

To this file we are now going to add the following code:

.data...