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give you a feel for how you might use these functions. Because there are only eight cogs on the chip, we have to have some discipline regarding how they are to be used. Because each cog is also capable of performing more than one task, as is any run of the mill processor, we also need some understanding of when and why more than one task should be assigned to one processor. This, too, is discussed so that you can assign tasks in a more logical manner when you design the hardware and software for your projects. The Spin language does not support an interrupt capability of any description. Having eight processors in a parallel configuration pretty much eliminates the need for interrupts. However, there are still times when you may need to assign some form of more immediate attention to a task, and techniques that can be used to achieve this are demonstrated. Attention is also given to the special features each cog supports. Of advanced interest is the use of the two counters provided in each cog and the interesting ways in which they can be used. The use of these counters is not obvious to the first-time user, especially so if he is a beginner. These counters provide an important and powerful function within each cog, and using them effectively is an important part of using the Propeller chip. Because there is a total of 16 of these counters in the Propeller, they provide a resource we cannot ignore if we are to consider ourselves as being familiar with the Propeller system. Parallax provides detailed information on using these counters, but most of it is beyond the understanding of beginners. We will use a counter to create a PWM signal when we need one; no other use is covered. Part III of the book is devoted to the projects. I have concentrated on controlling the types of things beginners will be interested in. I have covered some of these tasks in other books I have written, and other authors have written a lot about these topics as well. The difference in this resource is that we concentrate on how to undertake these tasks with the Propeller chip and its parallel-processing environment in a way that s interesting to the beginning programmer. Controlling things also has a lot do with process control, so in a way this book is a simplified introduction to process control in the parallel environment. The one thing that the Propeller chip does not do well is handle large amounts of data simultaneously. Such data crunching requires three basic resources:
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A fast processor to perform the work quickly. (This we have.) The implementation of a standardized, verified math package in the software to
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allow for sophisticated mathematical manipulations. A large amount of memory to store all the data to be crunched. The Propeller chip does not support all three of these capabilities and implementations. This does not mean that we cannot do the day-to-day math we need for our control operations; however, it does means that we are not working with a machine designed for crunching large number arrays. Consequently, there is no discussion of problems that require sophisticated mathematical capabilities in this resource.
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Then again, these are not problems that the average beginner is expected to need to address. I have permitted myself a certain amount of repetition from time to time in the various chapters to allow each chapter and each program to stand alone so that you do not have to read the entire book or look back for segments of programs to get the information you need from any one location. Almost all program listings provide complete programs that are ready to run. In this book I use the word transparent to mean invisible to us. Something we see right through without knowing it is there. Those aspects of a program s operation that are invisible are described as being transparent to the user. To the beginner, this means that those things that are transparent do not need to be of concern at this stage of the learning process. They happen automatically in the background, and the beginner cannot see or manipulate any aspect of their operation. We can ignore them for now. An example of a transparent operation is the operation of the computer mouse. It does its work without ever making any aspect of its internal workings visible to the user. The information in this resource came from all sorts of sources I was exposed to in my research, and they are not important enough to be documented as footnotes. The most important of them are the Propeller Manual, the Parallax forums, the Propeller object exchange, and the Internet. The experiments and exercises are similar to those I have used in my books on the PIC 16F877A about making instruments and controllers and running motors. These are basic techniques I developed to explain how the various techniques are implemented within a microprocessor. The task we are undertaking does not change, but the techniques used to get the job done do so that we can accommodate the instruction set available for the logic engine being used. The basic hardware you need to get going is the Propeller Education Kit (32305) from Parallax. Arrangements have been made to allow experimenters to get all other hard-to-get items from my Encodergeek.com website, and a list of what you need is provided in Appendix B. The Encodergeek.com site also hosts the support information and updates for the contents of this book. All the programs in the book are provided on the Encodergeek .com website, and you can copy and run them from there if you like. The site also contains a lot of other information of interest to the amateur experimenter. All the software in this book is provided for your use under the terms of the MIT License. It is yours to use as you see fit. Here is a commonly used version of the statement of the license. Terms of Use: MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software ), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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