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The schematic for the toy.
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MARYA S TOY BILL OF MATERIALS DESCRIPTION
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U1 U2 U3, U4 U5 Y1 15-segment LED R1, R18, R19 R2 R9, R11 R17 R10 POT1 C1, C2 C3 C7 SW1 SW2, SW4 J1 Misc.
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5-V regulator
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74S138, 3 to 8 demultiplexor 74LS374 PIC16F84 4/P 4-MHz ceramic resonator with internal capacitors 6 15-segment alphanumeric LED displays
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10 k , 1/4 W 220 100 10-k , 1/4 W , 1/4 W single-turn potentiometer
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10- F electrolytic 0.1 F, any type SPST power switch Momentary-on pushbutton switches 9-V alkaline battery connector Prototype PCB, project case, wiring
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The source code is Prog1.asm (which can be found in the code\MaryaToy folder). When I built the original, it was my plan to poll the buttons and read the potentiometer (as part of an RC network) to display the alphabet as well as numbers. I didn t do this because my daughter wasn t very interested in it even though it had the letters MARYA S TOY run across the LEDs. For some reason, she was always a lot more interested in the digital thermometer. The effort to add the additional functions didn t seem to be worthwhile until I started working on the second edition of this book and revisited this project, as I will discuss in the next section.
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MaryaBas: PICBASIC PORT OF MARYA S TOY
After updating the Marya s toy project for the second edition, I wanted to use it as a test bed to test out the capabilities of PICBASIC from the perspective of
1 Understanding how easy it is to develop complex applications in PICBASIC using
built-in PIC microcontroller hardware features
2 Measure the performance of PICBASIC compared with straight assembly-language
programming
PROJECTS
3 Mix a reasonably complex interrupt handler written in assembly language with
straight PICBASIC code
4 Evaluate the ease with which new features can be added to an application
My overall impressions of PICBASIC from this project are very favorable, but there are a few things that I learned that you should be aware of. I also want to say that this project turned out to be more than I bargained for in terms of both code development and debugging as well as dif culty. I would rate this application as being quite dif cult to implement and, when it comes right down to it, quite advanced in terms of the skills I had to apply to get it working. For this application, I wanted to use a PIC microcontroller with a built-in ADC rather than rely on the RC network as I originally proposed for this project; therefore, I used a PIC16C711 (which has a built-in ADC). I wanted to see how easily the ADC registers could be accessed from PICBASIC. I was happy to nd that to use the PIC16C711, all I had to do was specify the processor in the compile statement, and the correct libraries would be speci ed and loaded automatically. The original circuit was modi ed slightly with the RC network change to a simple potentiometer voltage divider and the button wired to RA1 relocated to RA3 because the PIC16C711 cannot just have RA0 as an analog input without RA1 also being an analog input as well. The updated circuit is shown in Fig. 21.35. The bill of material for the circuit is listed in Table 21.15. The PICBASIC application source code and PICBASIC compiled assembly-language code (which can be run from MPLAB) can be found in the code\maryabas folder. To create the application code, the rst thing that I wanted to do was replicate the functions that I had in the original assembly-language application. This application simply displays a scrolling MARYA S TOY string on the six 15-segment LED displays. The rst part of the implementation plan that I had for this application was to copy in the interrupt handler from the previous project exactly and just use PICBASIC for creating the display information. Along with leaving the interrupt handler in assembler, I also would include the tables used for storing the different ASCII characters. I wanted to keep the assembly-language interrupt handler as separate from the PICBASIC application as possible; the only interface would be the 6-byte Disp array, which contained the ASCII codes for each display. The PICBASIC mainline would provide the interface functions. As it turned out, this was an excellent approach to implementing the application that eventually included providing the same initial scrolling display along with polling the two buttons and displaying either the alphabet or the numbers 0 through 9, with the potentiometer selecting the initial digit. Implementing the initial capabilities is where I rst ran into signi cant problems. It was my intention simply to use the interrupt handler code from the original project, put the PICBASIC handler pre x and post x that I show in the Appendix E, and add some mainline code to have TMR0 driven from the instruction clock and enable the TMR0 interrupt request. I expected this to be a half-hour exercise, and it turned into 8 hours of frustrating debug.
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