An example of how to proceed with the design
Flux diagrams
Main program flux diagram
Sinusoidal routine
Verifying the code for the sinusoidal waveform
In the MPLAB environment, using a single breakpoint and the debugging Stopwatch tool, it is
possible to get the exact waveform period, a complete cycle of 62 values:
Freq = 1/ 1.154 ms = 866.5 Hz
In this scope screen is possible to measure approximately the waveform frequency:
Freq = 1/ (200 µs/Div)·5,8 Div = 862 Hz. So, the real power of the virtual laboratory has been
demonstrated (indeed, this application is very processor demanding and it stuck at 100% and
the oscilloscope is not correctly updated).
You may want to assay several frequencies adjusting the DELAY_VALUE constant.
You can debug your application from both tools, the Proteus-VSM and the MPLAB, using:
breakpoints, step by step execution, watching variables and registers, and so on.
The target PIC16F84A can be programmed using, for instance, the free IC-Prog software and
the cheap TE-20 board connected at the PC Com1 port (RS232).
Or instead, at the EPSC labs, you can use the professional PICSTART Plus programmer
accessed from the MPLAB itself
See also the assembler code to explore how the EEPROM have been uploaded with the data
from the Excel spreadsheet.