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really understanding the problem and with learning how to break a problem down into separate tasks, each of which can be assigned to one of the cogs, in an orderly and logical way. We will learn how to do this. Because not every problem lends itself to a parallel-processing solution, we will spend some time on learning how to identify those problems that can be solved within a parallel-processing environment. This book is intended for the novice user. It is for the novice user for two reasons: One, the material that Parallax provides regarding this chip is more advanced than a first-time user can master with ease. Two, I am also a novice as far as this particular discipline (parallel processing) goes. In this book, I share what I have learned with you, in a straightforward and hopefully nonintimidating manner that you will find useful. We will learn by doing, which is the best way to learn to do anything. Before we can start, though, we have to understand what the system is capable of and how this book is organized to address the tasks at hand. This book is divided into four parts that compartmentalize what we are interested in:
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The first part of the book introduces you to the Propeller chip, starting with one cog
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(the term used by Parallax for each of the eight 32-bit processors in the Propeller chip). First, we learn about just one of the eight processors and how to interact with the I/O provided on the chip. This I/O is in a shared portion of the chip that all the cogs can address. All the features of the one cog are covered in detail. At the end of the first part, you should have a good idea of what the system is all about and be ready to begin using it. In the second part of the book, I cover what you need to know to develop the skills necessary for creating a system that allows the cogs to work together. We will do this by learning how to make the Propeller interact with a number of input and output devices. I have selected the kind of devices an amateur enthusiast, a technician, or an engineer is likely to be interested in interacting with on a day-to-day basis displays, switches, detectors, motors, and such. The limited memory in the system does not lend itself to the handling of large arrays and related numbercrunching applications, so simple control applications like the ones we will consider are the most suited for investigation by us beginners. The major objective of this part of the book is to learn how to read and create signals of various types. In the third part of the book, we use the lessons we have learned in Part II to build and program a number of devices using the Propeller chip. The device in each experiment is a real-world application of the parallel-processing environment, and each one uses more than one cog. Not all the projects are completed 100 percent, so you have the challenge to complete them. Appropriate information and hints are provided. The fourth part of the book is composed of appendixes that provide you with supplemental information you will find helpful in using the device. This includes the hardware and software resources needed for the experiments we undertake. Where special items are needed, I have made arrangements to provide them on my website at Encodergeek.com.
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A large part of the information you need to help you use this processor can be found on websites maintained by Parallax and others. I recommend that you get familiar with what is in these websites and get comfortable with using the material these websites provide. The discussion forums are extraordinarily useful and should be made a part of your regular reading and learning experience. The following three online resources provide a good starting point as you progress through this book:
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The Parallax forums. These forums are your most useful resource. Wikipedia provides useful general information. The support web pages provide specific information.
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The Propeller chip software is organized such that routines called methods and procedures, created by one person, can be used by others with relative ease. Most of these procedures are well documented, and because all the code is visible, you can modify it to serve your more specific needs should that become necessary. This being the case, becoming familiar with and studying the work done by others is one of the skills you need to develop. I will provide methods with full documentation to support the devices we use so that you can see how these methods are created and then called in subsequent programs. All the experiments in this book can be undertaken with the Propeller Education Kit (32305) provided by Parallax and a minimal amount of additional hardware. Other than the Propeller programming tools provided by Parallax at no charge, consisting of Spin (a high-level language) and PASM (the Propeller Assembly language), no other software is needed. The few extra hardware items needed are listed in Appendix B. The work that we will undertake will be designed around the creation of software for running the type of devices you might use in the design of day-to-day projects on the hobby bench, the engineering laboratory, or the industrial research facility. The devices selected are inexpensive and fit within the constraint of working well with beginners who are just learning how to use the Propeller chip. None are hard to use. As mentioned previously, Parallax provides two languages for programming the Propeller chip. The first language is a high-level language called Spin. The Spin language can be used for almost everything we need to do, except for tasks that need extreme speed and therefore have to be handled with some sort of Assembly language constructs. All the work in this book will be done in the Spin language, with minor calls to Assembly language routines if and when necessary. The goal is to become familiar with the Spin language and to be aware of the capabilities that Assembly language provides. Assembly language routines can be embedded in the Spin language programs with minimal effort. In that this book addresses the needs of beginners, we will not do any programming in the Assembly language PASM. A large part of this book is dedicated to getting an understanding of how the Spin language is used to manage an eight-processor system and its shared memory. A number of simple rules are formulated to allow you to do this from a beginner s point of view. Starting and stopping cogs and assigning specific tasks to them is covered to
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