[Simulavr-devel] feedback example improved

[Joel Sherrill]

Hi,

I added a bit to the feedback example.  Nothing
particularly fancy, just enough to show that
it is possible to interpret output from the simulated
AVR and have an external program interpret and
react.

The example prints hello world #N where N is
1, 2 or 3.  Based upon the value it sees, the
feedback program changes the value input to ADC0.
The main() now prints the value it sees on ADC0
in between each line.

If you were testing a real application, you would
obviously be doing something MUCH more involved
but this illustrates the concept.

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