Subject:
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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 08:52:34 GMT
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Viewed:
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1356 times
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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).
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.
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.
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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| Quoting Torkel Niklasson <torkel.niklasson@te...ogic.com>: (...) That's what I gathered from the docs. Interesting- sounds much more productive, too, if perhaps a little limiting. (...) Great. What exactly do you mean by "adapt", by the way? Just (...) (24 years ago, 8-Jun-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: memory left
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| 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 (...) (24 years ago, 7-Jun-00, to lugnet.robotics.rcx.legos)
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