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Chances are that the device you are most interested in interfacing the PIC microcontroller to is the PC. Unfortunately, this is also the most dif cult device that you probably will try to interface to owing to the hardware complexities of modern systems and understanding the different paths data takes to get from one part of the PC to another. Further complicating the task of interfacing the PIC microcontroller to a PC is the sophistication of the Microsoft Windows operating systems now in use, with their high degree of separation between hardware and software that requires a very high level of education to develop hardware interfaces and the device drivers needed to access hardware within the PC. When people ask me about interfacing to a PC using the PIC microcontroller, I generally recommend that just the RS-232 serial ports be used as a connection between the PC and the PIC microcontroller. As I will discuss later in this chapter, there are some very interesting capabilities that you can exploit (including using the software interface with the USB port). The serial port interface is well supported by terminal emulators such as Hilgreave s HyperTerminal, and basic programming interfaces can access the serial ports directly by a number of different methods. When designing all port interfaces, I recommend developing the interface code to pass data in a human readable format and use standard text data transfers rather than compressed data. If this is serial data, it will allow a terminal emulator such as HyperTerminal to be used when you are debugging the PIC microcontroller interface allowing the PC application to be debugged separately, after the PIC microcontroller interface, which eliminates the two variables when something doesn t work. The time penalty is actually quite small for the text transfers and is more than offset by the ease with which applications can be debugged. The Universal Serial Bus ( USB ) is the PC (and Macintosh) interface that I expect to have the most capabilities with in the future. This interface is dynamically recon gurable and provides 100 mA at 5 V for peripheral devices. Right now, I believe that there is still some reluctance to take advantage of the USB interface, but as time goes on, I expect there to be more and easier interfaces available for hobbyists and small companies to take advantage of for their products.
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PRACTICAL PC INTERFACING
There are many ways in which each PC interface can be wired to the PIC microcontroller, and for this reason, this chapter really is more of a theory chapter with information speci c to the PC only provided. PIC microcontroller interface application code and circuitry can be found in Chap. 21 of this book.
PC Software Application Development Tools
As I indicated in the introduction to this chapter, the PC is becoming an increasingly complex device, as well as continually insulating the user from the actual hardware and systems running inside it. This trend is also continuing with the latest generation of application software development tools now on the market these tools tend to separate the developer more and more from the hardware, making developers rely on existing products that may or may not provide them with the functions necessary for their ideas. Another factor is the high cost of high-quality integrated development tools. The entire situation is unfortunate, and I believe that it is a major issue when it comes to students being able to learn about working with hardware, as well as hobbyists and small companies being able to develop applications. One of the most popular application software development tools currently used in the market is one that hasn t been supported for several years Visual Basic 6.0. This compiler, with a user-friendly integrated development environment, has some easy-to-workwith serial port interfacing capabilities, and while it is not particularly fast and produces code that is reasonably sized, it is still the choice of hobbyists and small businesses. Microsoft is promoting Visual Studio.Net (even to the point of making student editions of the development tools free for download), but these tools are geared more toward developing web and server applications instead of allowing people to experiment with their own ideas. Copies of Visual Basic 6.0 are available from web outlets such as EBay and in some dusty corners of computer stores if you can get your hands on a copy, I suggest that you do so. In this book I spend a bit of time explaining the MSComm serial port interface that is available within Visual Basic 6.0.
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