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6.11 EPIC command
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6.12 EPIC programming screen
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6.13 Selecting hex file
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After the configuration switches are set, insert the PIC 16F84 microcontroller into the socket. Click on Program or press Alt-P on the keyboard to begin programming. The EPIC program first looks at the microcontroller chip to see if it is blank. If the chip is blank, the EPIC program installs your program into the microcontroller. If
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6.14 Hex file loaded into EPIC program
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the microcontroller is not blank, you are given the options to cancel the operation or overwrite the existing program with the new program. If there is an existing program in the PIC chip s memory, write over it. The machine language code lines are highlighted as the PIC is programmed. When it is finished, the microcontroller is programmed and ready to run.
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Testing the PIC microcontroller
The schematic shows how minimal is the number of components needed to get your microcontroller up and running. Primarily you need a pull-up resistor on pin 4 (MCLR), a 4-megahertz (MHz) crystal with two [22-picofarad (pF)] capacitors, and a 5V power supply. The two LEDs and the two current-limiting resistors connected in series with the LEDs are the output. It allows us to see that the microcontroller and program are functioning. Assemble the components as shown in the schematic of Fig. 6.15 on the solderless breadboard. When you are finished, your work should appear as in Fig. 6.16. While the specifications sheet on the 16F84 states the microcontroller will operate on voltages from 2V to 6V, I provided a regulated 5V power supply for the circuit. The regulated power supply consists of a 7805 voltage regulator and two filter capacitors.
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6.15 Schematic
6.16 Circuit built on solderless breadboard
Wink
Apply power to the circuit. The LEDs connected to the chip will alternately turn on and off. Wink wink . Now you know how easy it is to program these microcontrollers and get them up and running. As you gain experience, using the compiler and programmer will become second nature. You won t even consider them as steps anymore. The real challenge will be in writing the best PICBASIC programs possible. And that is as it should be.
Troubleshooting the circuit
There is not too much that can go wrong here. If the LEDs don t light up, the first thing I would check is the orientation of the LEDs. If they are put in backwards, they will not light.
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PICBASIC Pro compiler
There is also a high-end version of the PICBASIC compiler named the PICBASIC Professional Compiler. The Pro version compiler is considerably more expensive, retailing for $249.95. The Pro version has a greater number of and much richer BASIC commands than are in the standard compiler package. A few of the additional commands to be found in the Pro version allow the use of Interrupts, direct control of light-crystal display (LCD) modules, dual-tone multifrequency (DTMF) out, and X-10 commands, to name a few. While a more sophisticated package, the compiler does not handle two of my favorite (and very powerful) BASIC commands: Peek and Poke. While the commands are listed as functional in the Pro manual, it is emphasized that Peek and Poke should never be used in a PICBASIC Pro program. This is unfortunate, personal feelings aside, because it destroys upward compatibility of any PICBASIC programs that use the Peek and Poke commands.
New IDE features
Recently, both the PICBASIC and PICBASIC Pro compilers are being packaged with an additional diskette that contains a Windows integrated development environment (IDE) interface called CodeDesigner Lite (see Fig. 6.17). CodeDesigner Lite allows one
6.17 CodeDesigner Lite
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to write and compile PICBASIC code in a Windows environment. Each statement is color-coded, making it much easier to spot errors and read through your code. The freebie version allows you to write programs up to 150 lines and open up three source files at once for easy copy and paste. The most important feature of the CodeDesigner IDE interface is that it allows you to first write the program, then compile the program into a hex file, and finally (in theory) program the microcontroller while in the same window. This reduces program development time. Typically, I write while in DOS or an MS-DOS prompt window. I write the program text file using the DOS Edit program. When finished, I then exit Edit and manually compile the program. If there is a problem (more times than not), I then restart Edit and debug the code. When the program is completely debugged, I load the program into the PIC microcontroller using the EPIC software and programming board. At this point the microcontroller/circuit is tested. If it functions properly, I m finished; if not, I begin rewriting the program. In using CodeDesigner, the ease with which you can write and debug PICBASIC programs and load them into the microcontroller increases productivity. My experience is that I can code and debug my programs while in Windows, but to program a microcontroller, I still must drop down into DOS. While the freebie version (CodeDesigner Lite) is functional, if you like it, you can then upgrade to the full-featured CodeDesigner. CodeDesigner is available in a hobbyist version for $45.00 and a standard version for $75.00. The hobbyist version of CodeDesigner only works with the PICBASIC compiler. The standard version will work with both the PICBASIC and PICBASIC Pro compilers. Some of the advanced features of CodeDesigner include AutoCodeCompletion: CodeDesigner makes writing code much easier with smart pop-up list boxes that can automatically fill in statements and parameters for you. Multiple document support. Line error highlighting: CodeDesigner will read error data and highlight error lines when you compile your PICBASIC project. QuickSyntaxHelp: The QuickSyntaxHelp feature displays statement syntax when you type in a valid PICBASIC statement. Statement description: Statement descriptions are displayed in the status bar when you type in a valid PICBASIC statement.
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