Subject:
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Re: Call for debugging support
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Fri, 17 Dec 1999 01:29:34 GMT
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Viewed:
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1230 times
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Sorry to digress, but I just wanted to ask a question: is "equal sign B 4"
supposed to be a code for the apostrophe? (They're not translating to
apostrophes on my viewer.) How then would you make other symbols? Does this
code reference some non-ASCII character set or is it HTML?
In lugnet.robotics.rcx.legos, Martin Cornelius writes:
> "Markus L. Noga" wrote:
> > Hello everyone,
> >
> > a while ago several people discussed decent debugging facilities for
> > legOS, possibly in the form of remote gdb support. Did work in this
> > avenue progress to something faintly usable already? If not, what are
> > the key problems?
>
> hello Markus, i=B4m still working on a (hopefully) portable, robust
> version of linux LNP, that allows multiple client tasks or threads on
> the PC to communicate with one ore more RCX=B4s simultanously via one
> tower, ( one of them could be gdb, in my imagination ).
>
> The key problem here is linux/i386 deficient realtime capability --
> scheduling with 100HZ is just a bit too slow to handle LNP at 2400 baud
> -- with 4800 baud, it=B4s worse. I looked at recent versions of rt-linux
> and KURT, and think both could do the trick, but i suspect most people
> won=B4t like to patch their kernel for this reason.
>
> I have a running version of 2400 baud LNP (on standard 2.2.13 kernel)
> that looks pretty robust, even in severe contention circumstances, but
> requires to disable hardware buffering of the uart. This can be done for
> mainstream 16550A uarts on linux, but it=B4s not portable. I don=B4t like=
>
> this implementation too much for another reason: it uses SIGALRM for
> keeping track of inter byte timeouts and tower keepalive, and i think a
> general purpose library shouldn=B4t use SIGALRM, if that can be avoided.
>
> My currently favored approach is to use select() for everything, my
> tests show it is not affected by the hardware FIFO of the uart. Of
> course, this requires to run the select() loop in a separate thread, but
> POSIX threads are portable, hopefully. BTW, can anybody tell me if WINxx
> supports
> select() and/or POSIX threads ?
>
> Unfortunately, currently there=B4s very little spare time i can spend on
> legOS, but after Xmas i=B4ll have 7 days of vacancy 8-).
>
> bye, Martin
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Message has 1 Reply:
 | | Re: Call for debugging support
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| (...) It is MIME encoding for non-ASCII characters. Cheers, Ben. -- SECURE HOSTING AT THE BUNKER! (URL) grandfather once told me that there are two kinds of people: those who work and those who take the credit. He told me to try to be in the first (...) (25 years ago, 17-Dec-99, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: Call for debugging support
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| (...) hello Markus, i´m still working on a (hopefully) portable, robust version of linux LNP, that allows multiple client tasks or threads on the PC to communicate with one ore more RCX´s simultanously via one tower, ( one of them could be gdb, in (...) (25 years ago, 17-Dec-99, to lugnet.robotics.rcx.legos)
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