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README.md

QMdbSim Project

The QMdbSim Project is a framework for using Microchip micro-controller devices (PIC, AVR) in QSpice simulations. It uses Microchip's software simulator so, in theory, it supports the same devices to the same extent as the simulator in MPLabX.

Charlie-Plex Demo Schematic PIC16F15213 Device Schematic Charlie-Plex Waveforms

This initial release implements PIC16F15213 and ATtiny85 components.

  • Compiled component DLLs are included. You can change the PIC/AVR device code without recompiling the DLL.

  • Compiled and source "Charlie-Plexing" device test code is included.

  • MSVS 2022 project files are included if you need/want to recompile the DLL. (They are pre-configured for interactive debugging with QSPICE64.exe.)

Of course, you can define other Microchip devices easily using the framework.

Basic user and developer documentation is in the QMdbSim_Project_Doc PDF. Note that the documentation was written for the PIC16F15213 chip. It applies equally to the ATtiny85 device.

Core Code Revisions

The QMdbSim.cpp/.h code is shared across devices. Once we get through the initial project shake-down, it should not change much. At this point, I foresee a few more changes....

  • 2025.02.26 - Initial release. Core code v0.3.0.
  • 2025.02.28 - Core code v0.3.1. Small change to accomodate AVR/PIC supply pin naming difference.
  • 2026.05.26 - Verified that the project continues to work with MPLabX 6.30 after changing the path to MDB.bat in implementation schematics. No additional changes are required.

Implemented Devices

  • PIC16F15213 (2025.02.26)
  • ATtiny85 (2025.02.28)

Contributors Needed

This project will be useful only to the extent that popular Microchip devices are supported. If you implement a new device, please share. I'll add your contribution to this repository and, of course, I'll be sure that you get credit.

A Special Plea To Java-Coders

If you're a Java-coder with a little spare time, please contact me. The framework is slow (and potentially unreliable) due to parsing the MDB command-line stuff. A minimal rewrite of the MDB terminal interface to simplify machine-parsing could speed things up significantly. Even better would be the ability to call the Java API from C++ code directly.

Contact Me

Send me a message if you have questions, suggestions, corrections, or code contributions.

You'll find me as @RDunn on Qorvo's QSpice forum.

--robert