gnupic: Re: [gnupic] Multiple PICs with gpsim.
Subject:
Re: [gnupic] Multiple PICs with gpsim.
From:
Scott Dattalo ####@####.####
Date:
19 Jan 2007 16:52:15 +0000
Message-Id: <45B0F701.1070501@dattalo.com>
Ralph Corderoy wrote:
> Hi,
>
> I'm just starting out with PICs and will be sticking with gpsim and
> friends for development. The project I've got in mind will end up with
> several PICs. I see gpsim supports loadable modules for adding things
> like LEDs to the simulation. Is the PIC itself emulated as a module,
> i.e. can I wire together a couple of PICs?
>
> From a skim of the manual, I'd guess not, in which case has anyone tried
> connecting multiple gpsims together using OS facilities, with each one
> emulating one PIC?
>
Hi Ralph,
Currently gpsim cannot simulate multiple PICs at once. However, adding
this feature has been one of my long term goals.
You are correct that each PIC is like a loadable module. Unfortunately
gpsim treats the processors different than the modules. There are two
significant areas where this is problem. First, the simulation time is
in the context of a processor. If there are two (or more) processors
then gpsim cannot model time. I'm in the process of fixing that
limitation. Over the last few months I've redesigned the way a processor
is clocked. This work has been divided into two phases. The first phase
was to provide a mechanism within the context of the processor whereby
time can be advanced. That's done. The next phase is to move the global
time keeper (Cycle_Counter class) into the Processor class and create a
new global time keeper that's capable of clocking individual processors.
Check out this thread for a more detailed discussion:
http://sourceforge.net/mailarchive/forum.php?thread_id=30948636&forum_id=10321
The other significant problem gpsim has for simulating multiple
processors is the user interface. Both the command line and gui assume
there is only one processor. I think I can fix the command line easy
enough. However, the gui is going to be rather difficult to handle. And
quite frankly, I don't what to do about the gui.
Scott
