Everything has its end. This project does as well.
MCUSim will be archived from now on as I don't have enough time to develop it further.
Feel free to fork it. If you'll be interested in plans and development ideas - drop me a note via email. I'll share them gladly. Good luck!

MCUSim is a digital simulator and NGSpice library with microcontrollers. It is created to assist in circuit simulation, firmware debugging, testing and signal tracing.

Please note that the 8-bit AVR (RISC) microcontrollers are aimed at the moment. Feel free to start a discussion about any other family or architecture of the microcontrollers.

$ git clone https://github.com/mcusim/MCUSim.git
$ cd MCUSim
$ mkdir build && cd build
$ cmake -DWITH_UNIT_TESTS=True -DWITH_XSPICE=True ..
$ make && make check && make tests
$ make install

There is an mcusim.conf configuration file installed together with the mcusim binary and libmsim which can be used to tweak the program.

The best way to prepare your own simulation is to copy mcusim.conf to a new directory, adjust the options and run the simulator. Firmware and Lua files should also be placed there.

Lua scripts can be used to substitute models of the real devices during a simulation process. They may affect state of the chip in several ways, e.g. access registers, generate signals or terminate MCU.

Scripts are supposed to be external devices connected to the MCU of the simulated circuit (external EEPROM, humidity sensor, MOSFET switch, etc).

Registers of the simulated MCU can be saved into a VCD (value change dump) file and read using GTKWave viewer.

Feel free to ask questions and start a discussion in a mailing list for developers. Just subscribe and send a letter.

You may drop a note in the mailing list first or just code the feature you want to add and share your patch there. Before you start coding check the latest development release of MCUSim from our git repository or try to find a ticket at https://trac.mcusim.org/report. It might be that your feature has already been implemented.

There is no bureaucracy here.

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Source code is hosted at https://github.com/mcusim/MCUSim.
Wiki and issue tracker are at https://trac.mcusim.org.
Mailing list is at https://www.freelists.org/list/mcusim-dev.