Subject:
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Re: LNP - lets get coding.
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sat, 31 Jul 1999 22:08:36 GMT
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Viewed:
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4074 times
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Kevin Baker <kevin.baker@racalitsec.com> wrote:
> In lugnet.robotics.rcx.legos, Kekoa Proudfoot writes:
> > You will miss about 1 in 256 errors that you do not catch earlier using
> > collision detection. I think your error rate per message will be much less
> > than 1 in 256 if you (can?) get the collision detection code right.
> >
> > But we shouldn't argue the point. Somebody should just code it and try
> > it. Practice will show whether a CRC8 is sufficient or whether a CRC16
> > will be required.
>
> Didn't mean to come across as arguing - sorry if I did!
No, you didn't - I just didn't wanted to make sure I wasn't :)
> 1) Line level protocol (Basic frame rx/tx with collision detection, CRC
> work etc.). Has provision to send messages on request, and passes rx'ed
> messages with good CRC etc. up to higher level. (i.e. it performs the
> basic MAC level).
This has already been done, for Librcx at least; don't know if anybody took
a look at the code I put at:
http://graphics.stanford.edu/~kekoa/rcx/driver/
Somebody mentioned wanting to maybe take a look at that; porting to LegOS
can't take more than a day (since it didn't take more that a day to write)
:)
The code does the low-level stuff you mentioned, minus support for ports,
acks, and resends and minus "proper thread interactions" which I define to
mean proper support for threads non-busy-type waiting on serial events,
like message arrival, message send complete, or a collision detected while
sending or receiving. This stuff all seems to fall into (2) on your list.
-Kekoa
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Message has 1 Reply:
 | | Re: LNP - lets get coding.
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| (...) I have just grabbed a copy - will have a look! Where do you suggest we go from here? I'm up for creating an initial API and getting some code cut (Within my limits - I know little/nothing about Linux & MacOS, and as yes LegOS). However, I'm (...) (27 years ago, 1-Aug-99, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | LNP - lets get coding.
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| (...) Hi, Didn't mean to come across as arguing - sorry if I did! As you say, lets get coding LNP (My assumption is that the coding bit hasn't started yet, if it has, please accept my apologies & let me know how it is going!). I guess the things (...) (27 years ago, 31-Jul-99, to lugnet.robotics.rcx.legos)
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