Subject:
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Re: legOS - Does it work for you?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 31 Dec 1998 11:37:41 GMT
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Original-From:
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Ben Laurie <BEN@ALGROUP.saynotospamCO.UK>
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Viewed:
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1109 times
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Rick Kimball wrote:
>
> I'm really excited about the legOS. I got egcs that
> came with RedHat 5.1 setup as a cross compiler. I
> grabbed the source to legOS and started playing...
> In fact, that is all I have done for the last couple
> of days.
>
> I've had good success running the demo programs.
> That is, as long as I don't toggle the run button
> more than 5 or 6 times. After that the RCX would
> just flake out. I spent some time debugging it and
> it looks to me like the task management stuff
> is corrupting memory. I added my own mm_grim_reaper
> routine to the main loop that basically does an
> mm_init.
Hmmm ... not so sure if the task manager is responsible - I have a
related (I think) problem if I use static variables - programs that work
fine with global variables just lock solid when they are static. Since
making them static merely moves them around the memory map (and, because
of alignment, in the particular case moves everything else up by errr 8
bytes?) I strongly suspect memory corruption. But this happens first
run, so my finger is pointing at memory management, not task management.
It might be worth picking up the standard malloc/free and seeing if they
work any better.
Cheers,
Ben.
--
Ben Laurie |Phone: +44 (181) 735 0686| Apache Group member
Freelance Consultant |Fax: +44 (181) 735 0689|http://www.apache.org/
and Technical Director|Email: ben@algroup.co.uk |
A.L. Digital Ltd, |Apache-SSL author http://www.apache-ssl.org/
London, England. |"Apache: TDG" http://www.ora.com/catalog/apache/
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 2 Replies:
 | | Re: legOS - Does it work for you?
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| (...) I tried that with the same results. At that point, I added some debug messages to the malloc and free routines. Using the demo light-sensor program I wrote down the addresses returned by malloc. There are only two calls per execi, the (...) (25 years ago, 31-Dec-98, to lugnet.robotics)
| | | Re: legOS - Does it work for you?
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| (...) Ben you were right! I replace the malloc/free routines with a very simple array based allocation scheme and everything works great. I guess the other malloc I grabbed off the net wasn't any good either. Thanks! (25 years ago, 31-Dec-98, to lugnet.robotics)
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Message is in Reply To:
| | legOS - Does it work for you?
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| I'm really excited about the legOS. I got egcs that came with RedHat 5.1 setup as a cross compiler. I grabbed the source to legOS and started playing... In fact, that is all I have done for the last couple of days. I've had good success running the (...) (25 years ago, 30-Dec-98, to lugnet.robotics)
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