Re: [Simulavr-devel] Invalid device specification: atmega2560

[Joel Sherrill]

Knut Schwichtenberg wrote:
> Jonathan,
> there is no device spec for the M2560. I think, it is serously difficult for the
> M2560 because:
>
> 1. 24Bit PC needs a walk through several moduls
> 2. M128 and M2560 IO-components might be named identical but might provide
> different functions (e.g. timer)
>
> Writing the atmega2560.cpp is the easiest. The details of the hardware have to
> compared subsystem by subsystem between M128 and M2560 and that's everything
> else than done in 20 minutes.
>
> It is not a question of your C++ experience but a question of your AVR hardware
> understanding and an understanding of simulavrxx.
>
>   
I will second that.  The C++ code is fairly easy to get your head
around but the AVR details are critical. 

But since you have a specific part in mind to simulate, that is
IMO a good thing.  It focuses you more than when I started where
I just saw a bunch of code and wanted to understand everything.

I would add that there are nice people here and you should be able
to incrementally work through this -- get a little working, submit a
working subset.  Add support for a specific IO subsystem, submit.
Repeat until done.

Don't forget tests for instructions and IO.
> Cheers
> Knut
>
> Jonathan Moreton wrote:
>   
> > Is there currently a device specification for the Atmel atmega2560?
> > If not how easy is it for someone with little c++ experience to create?
> >
> > Many thanks
> > Jonathan Moreton
> >     
>
>
>
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>   


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