HSC2011/Software/EmbedVM: Unterschied zwischen den Versionen

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EmbedVm is a fully functional virtual machine that runs inside the ATMEL MCU. It can easily be ported

to other CPU architectures as it is entirely written in C.

~~EmbedVm is a fully functional virtual machine that runs inside~~ the ~~ATMEL MCU series~~.

You can find its sources [http://svn.clifford.at/embedvm/trunk/ here] and the project website

[http://www.clifford.at/embedvm/ here].

~~You can find [http://svn~~.~~clifford.at/embedvm/trunk/ its source here]~~

The VM itself takes ~3KB of program memory and consosts of ~300 lines of code.

~~The VM itself takes ~3KB of memory and consosts of ~300 lines of code~~.

There are two ways to write programs to run inside the virtual machine.

There are two ~~ways~~ to ~~write programs~~ to ~~run inside~~ the ~~virtual machine~~.

There are two compilers that target EmbedVM: There is a compiler for a C-like high level language and there is a compiler that can transform python code to VM bytecode. The compiler for the C-like language is part of the EmbedVM sources. The python compiler can be found [http://github.com/chrysn/embedvm here].

=== Code for the EduBuzzer ===

The directory <tt>firmware/vmcode</tt> contains some code (<tt>firmware.vm</tt>) that is saved in the devices' flash memory as a standard library (e.g. the animation played while searching for a base station). The functions defined there can be used in custom code as well.

If a game wants to do something more sophisticated than turning a LED on or setting the buzzer to a fixed frequency, it can push additional code into the ATMega's RAM using the <tt>W</tt> command [[HSC2011/Communication/Serial protocol|described in the communication description]], and starting with the <tt>V</tt> command with an interrupt to the address of the main function.

~~You can either use~~ a ~~highlevel language thats a mixture between C~~ and ~~javascript with its own compiler or you can use python~~ to ~~write code~~.

Until further documentation is published, see the <tt>simon.py</tt> example program, which implements Simon's Game (the device beeps out a sequence of blinks, and the user has to enter it afterwards) in about 256 byte (of 512 currently allocated) of RAM.

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