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The software is provided as is, without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and non-infringement. In no event shall the authors or copyright holders be liable for any claim, damages, or other liability, whether in an action of contract, tort, or otherwise, arising from, out of or in connection with the Software or the use or other dealings in the Software. Harprit Singh Sandhu Champaign, Illinois USA harprit.sandhu@gmail.com
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Part I
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The ProPeller/SPin SySTem
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Before we can start doing things with the Propeller, we need to have an understanding of exactly what we have to work with. Once we understand the Propeller hardware and a bit about the Spin software, we can proceed with our experiments and develop the software needed to execute them.
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A GenerAl inTroducTion To The ProPeller chiP
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notes A data sheet is now available for the Propeller chip, under the Help section
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of the Propeller Tool (Version 1.2.6). If you need specific information about the Propeller, you should refer to the data sheet. The very adequate Propeller Manual (Version 1.1) is suitable for beginners and can be downloaded from the Internet at no charge. Teaching materials are being developed and released by Parallax on a continuing basis. Discussion forums are in place and provide very helpful advice. An extensive Object Exchange is maintained by Parallax on their website. However, all current efforts are aimed at those already fairly comfortable with microprocessor programming. This book provides an information resource for the beginner. It attempts to fill the void with a simple learn by doing approach designed specifically for the beginner who knows very little about this chip but has some general familiarity with electronics and with microprocessor programming. Before we start I would like to share a secret with you: Once you learn to use the Propeller in its parallel processing environment, you will be hard pressed to ever again use a conventional processor for the kind of tasks small microcontrollers are designed for. The Propeller system is both incredibly powerful and incredibly easy to use. You will be glad to have learned how to use it.
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The Propeller Manual
If you need to know more about any of the topics discussed in this book, go to the Propeller Manual for details. The information provided in the manual is not repeated here. This being the case, I strongly recommend you obtain a copy of the Propeller Manual to use as your absolute reference as you study these chapters. A copy of the manual is also available in the Help section of the Propeller Tool. You should have the electronic copy open on your computer when programming the Propeller so that you
A GenerAl inTroducTion To The ProPeller chiP
can perform an electronic search when you need to find something in the manual. You will find that having both a hard copy and an electronic version of the manual is convenient and useful. Before we can start using any device effectively, we need to have some familiarity with the general framework within which the device operates. In our case we need to gain an understanding of how the eight microprocessors (the cogs) on the chip are arranged to interact with the shared memory and the other system resources that tie the eight cogs together. In Part I of the book in general, and in this chapter in particular, we will gain an understanding of these arrangements as we discuss some other general aspects of parallel computing in an introductory format. In 2006, some very clever and gifted engineers at Parallax, Inc., in California, under the leadership of Chip Gracey, introduced Parallel processing for the rest of us to the world. This adventure comes to us in the form of a chip that contains eight 32-bit processors with a rather large amount of shared memory. (It is available in a number of formats, including the 40-pin DIP package we are using.) This chip is called the Propeller. Along with the hardware in the form of the chip, the team has provided us with software in the form of two languages suitable for programming the chip. The first language is an object-based language called Spin, with some interesting and useful formatting enhancements. The other language is called Propeller Assembly and consists of a set of assembly language routines that allow fast, more immediate and elemental programming of the Propeller chip. All higher-level programming is done in the Spin language, and all assembly language references can be executed within the Spin framework so that an assembly language program can be started and stopped with just a couple lines of Spin code bracketing the entire assembly language notation. Programs are written with the Propeller Tool (an editing and loading program provided by Parallax). All the software is free for the downloading, from the Internet! All this leaves all the other systems you might consider for the kind of work that microcontrollers do in the dust. So much so that during the Fall of 2009, even Parallax did not fully comprehend what a wonderful logic engine they had created, and for a couple months you could not buy a 40-pin DIP Propeller chip anywhere in the world. Everyone was out of inventory. (The LQFP and QFN versions of the chip remained available.) Together, the hardware and software environments provide us with everything we need to implement small parallel processing scenarios. Because parallel processing is pretty much accepted as the next big step that will have to be undertaken to speed up the computational processes currently being run by fairly fast single-processor linear systems, the ability to play with these eight processors in a well-managed environment is a dream come true for many of us. In this book, I will share this adventure with you and in the process of so doing will introduce you to the techniques and rules that allow you to use the Propeller system with confidence and maybe even some expertise. Parallax has published a detailed data sheet for this chip. It contains all the information required for the kind of processing that needs to be informed of the most intimate details of the insides of the engine. This is not an important resource for beginners, though. The Propeller Manual provided for the Propeller chip covers both languages in detail with more than adequate examples of instruction usage and notation.
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