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Breaking the ice with Microchip DSP controllers


There are many controllers available on the market, and each brand has particularities that make it more or less attractive. Microchip controllers are some of the best, and this explains why, during the last ten years, their development has been simply explosive. In this article I will try to develop the title topic by answering to the following questions: why, what, and how.

“Why Microchip controllers, particularly?” Well, there are few net advantages over the competition, and the most important to me is technical documentation. Microchip technical documentation is the best one structured, logically, and the easiest to assimilate. “Is this important?” some of you would ask. This is the most important aspect, because almost each controller machine comes with few hundreds (or thousands) pages of data, hence, that documentation needs to be easily understood. In addition, the generally accepted conclusion is that, if you learn how to work with one Microchip controller, you will learn, in fact, to work with all of them. Wow! This is really something, because Microchip offers few hundred different types of controllers.

Another good reason for learning Microchip technology is the development tools; they are fairly cheap, when compared to other brands. However, if you intend to start learning microcontroller hardware and firmware design, do expect to invest some money for this, because it is not cheap. Generally, the “how to” secrets of the “trade” are never revealed, and it takes years to lean them, but… Yes, there are shortcuts.

The second question is: “What can we do with this microcontroller technology?” The blunt answer is anything you want; anything technical that requires little intelligence. A controller is a reduced version of a processor, and they are designed to “control”, to “give life” to electronic circuits in technical applications. Each controller has two definite characteristics: the hardware capabilities, and the firmware intelligence.

The hardware capabilities, or specifications, is an issue on which we decide, as designers, and the only relatively difficult process is deciding on one controller type or the other. Microchip offers a wide range of controllers, form 6 pins, 4 MHz, and 2 Kbytes of memory to the powerful DSP controllers with 64 pins, 120 MHz and 144 Kbytes of Flash memory. In addition, many controllers have nice and tempting built-in functions that make our life a lot easier; for example USART--serial communications with RS232.

The firmware intelligence of a controller is a direct expression of our level of intelligence. Many designers describe the feeling of making a controller work as being similar to giving “life”--it is really something. Further from here, it is only up to us how much intelligence our technical applications have, but I can assure you that the results can be “amazing”.

Now, the last question left to answer is: “How could we achieve those “amazing” results, when designing with Microchip controllers?” As I mentioned, those design secrets are not easily revealed, and most of the times the Gurus guard them jealously. What you need is a good tutorial book to guide your first, unsure steps of hardware, firmware, and--why not?--even software design. There are not many books like the one I refer to, and you will find it in my home site, at Corollary Theorems.

This tutorial book is a practical design project, structured in three parts. Hardware Design, part one, will build the hardware companion kit, HCK V2.2, around a Microchip dsPIC30F4011, working at 80 MHz. I am certain you have noticed that the controller used is very advanced, but rest assured that you will learn working with it, “the easy way”. Next, once you learn how to “tame” this “wild beast”, dsPIC processor, you will be able to work with any Microchip controller.

In part 2, Firmware Design, you will learn to write firmware code in C, and this is very good. Writing firmware in C it is really fun and very easy, when compared to the alternative, which is Assembler. By writing few words in text format, your controller machine is going to do the most amazing things for you. Have no fears: you are going to understand firmware design to a level known to few programmers, with minimal efforts.

Last part, Software Design, uses Visual Basic to build a nice graphic interface, to take control of hardware and firmware. In fact, this part teaches you how to use the entire PC power, to supplement your controller’s functionality. Do not be shy to experiment, because you cannot know what skills and talents lie dormant deep within yourself.

Life is very demanding today; with some efforts, however, you could build a nice commercial product, and become the boss, tomorrow. Have faith, my friend: you can do it!

Author Info:

O G POPA is Professional Engineer in BC, Canada. His home site is Corollary Theorems at http://www.corollarytheorems.com


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