Subject:
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Re: SDL and legOS (was: memory left)
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 8 Jun 2000 18:18:07 GMT
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Viewed:
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1321 times
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Quoting Torkel Niklasson <torkel.niklasson@telelogic.com>:
> Well, SDL is a very good programming language indeed. Its main
> attraction to
> me is that it draws your attention away from stupid little programming
> errors, such as memory allocation, pointers not pointing where they're
> supposed to point and suchlike. SDL code is pretty much a number of
> state
> machines, and you control it with signals and timers, which are
> generated by
> other state machines or the environment (the robot, in our case).
That's what I gathered from the docs. Interesting- sounds much more productive,
too, if perhaps a little limiting.
> The programming tool itself generates C-code, based on the SDL code you
> produce. (Without legOS, it would not have been possible for us to get
> as
> far as we have. Thanks to all who have worked on it.)
> Then you have to adapt this C-code to the platform you are currently
> adapting to. In our case, it's the RCX/legOS. So far, we've got the
> robot to
> do pretty much what we want it to do.
Great. What exactly do you mean by "adapt", by the way? Just certain interfaces
that need to be provided or what?
> Now, this may sound great, but there is indeed a major downside to it.
> It is
> not a programming tool designed for the home user, but for major
> telecommunication corporations, like Ericsson, Nokia, Motorola, Alcatel
> and
> Bellcore, and therefor the license cost is scaled accordingly. I believe
> you'd have to cough up about $50000 for it. Unless of course you're an
> educational institution. Then you can probably get it cheaper. The
> reason we
> get to work with the tool for free, is that we work at the company that
> produces it.
/me nods. Once upon a time I was an educational institution but I'm afraid that
day has passed ;) It would seem unlikely then that this "port" is for external
distribution- are you just doing it for fun, or is some type of technology demo
for the company or clients?
Anyway, i'm just curious- no need to answer these if they pry too far into
company secrets-
Luis
> Torkel
>
> Luis Villa <liv@duke.edu> wrote in message
> news:Pine.SOL.3.91.1000607103559.18360A-100000@teer13.acpub.duke.edu...
> > I'm pretty much always interested in anything that anyone does with
> > legOS.... makes me feel less lonely here ;) I've never heard of SDL
> > before, but after looking through some of the docs, I'll admit it • looks
> > quite interesting. Please keep up us to date (especially if there is • any
> > way we can use the tools- i'm always interested in new devel platforms
> > for legOS.)
> > -Luis
> >
> > On Wed, 7 Jun 2000, Torkel Niklasson wrote:
> > >
> > > Thank you. The reason I'm asking is that we are doing our master's
> > > work/thesis on adapting the Telelogic (Swedish company) SDL tool to • the
> > > legos platform. I guess the measurement of memory is not a critical
> part
> of
> > > this, unless there is none left, but it would be useful to know how
> big
> of a
> > > system we are actually generating. If anyone is interested, I can • further
> > > describe our project later. I will probably explain even if no one • is
> > > interested. :)
> > >
> > > Torkel
> > >
> > >
> > > Luis Villa <liv@duke.edu> wrote in message
>
> news:Pine.SOL.3.91.1000607101019.18310A-100000@teer13.acpub.duke.edu...
> > > > Not to the best of my knowledge, but I'll take a look later this
> > > > afternoon. If you need to create more memory, take a look at
> > > > kernel/config.h, and start undefining features that you don't
> need.
> None
> > > > of those will make a huge difference, but they are worth trying...
> > > > Luis
> > > >
> > > > On Wed, 7 Jun 2000, Torkel Niklasson wrote:
> > > >
> > > > > Date: Wed, 7 Jun 2000 10:44:59 GMT
> > > > > From: Torkel Niklasson <torkel.niklasson@telelogic.com>
> > > > > To: lugnet.robotics.rcx.legos@lugnet.com
> > > > > Subject: memory left
> > > > >
> > > > > Is there a way to check how much memory is still available on
> the
> RCX?
> > > > >
> > > > > Torkel
> > > > >
> > > > >
> > > >
> > >
> >
> -----------------------------------------------------------------------
> > > >
> > > > "Going to California with an aching in my heart.
> > > > Someone told me there's a girl out there
> > > > with love in her eyes and flowers in her hair."
> > > > -Led Zeppelin, "Going to California"
> > >
> > >
> >
> -----------------------------------------------------------------------
> > >
> > >
> > >
> >
> >
> -----------------------------------------------------------------------
> >
> > "Going to California with an aching in my heart.
> > Someone told me there's a girl out there
> > with love in her eyes and flowers in her hair."
> > -Led Zeppelin, "Going to California"
> >
> >
> -----------------------------------------------------------------------
>
>
>
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Message has 1 Reply:
 | | Re: SDL and legOS (was: memory left)
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| Luis Villa <liv@duke.edu> wrote in message news:960488287.393fe...uke.edu... (...) productive, (...) Well, it depends of course on what you intend to do with it. If you for example design and implement a protocol of some sort, it's a great (...) (24 years ago, 9-Jun-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | SDL and legOS (was: memory left)
|
| Well, SDL is a very good programming language indeed. Its main attraction to me is that it draws your attention away from stupid little programming errors, such as memory allocation, pointers not pointing where they're supposed to point and (...) (24 years ago, 8-Jun-00, to lugnet.robotics.rcx.legos)
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