Subject:
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Re: frame RCX reply how
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 1 Feb 2003 10:38:30 GMT
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Viewed:
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4575 times
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Hi pat,
take a look at
http://graphics.stanford.edu/%7Ekekoa/rcx/#Protocol
"Pat LaVarre" <ppaatt@aol.com> writes:
>
> Anybody know how to divide the bytes incoming from the RCX IR replies into
> correct frames, preferably using javax.comm on a Linux/Windows PC?
>
> I'm told I might want to:
>
> 1) Expect first an exact echo of the command packet.
This is what you send reflected by the walls, I think.
> 2) Expect the reply code to be the op complemented [even bit 3?].
> 3) Expect the bytes of the reply to arrive one after another, with no
> appreciable delay in between [up to how many bytes?].
Bits 0-2 of the opcode tells you the number, with 6 meaning 0
and 7 meaning 1. For some special opcodes it is longer.
> I wonder what the arrival rate actually is. Could it be:
> (8 data + 1 parity + 1 stop bit) /byte / 2400 Hz = 1/240 s/byte = 4.167ms/byte.
+ 1 start bit
I think there's some Java code for this in Lejos,
though I haven't looked myself.
Good luck
Jürgen
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
I åa ä e ö å i öa ä e å.
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Message has 2 Replies:
 | | Re: frame RCX reply how
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| (...) Ah, thanks. Can we therefore conclude 45.8 ms/byte = 11/2400 s/byte for each byte of a burst? (...) Tell me more? Do we mean to say RCX in the middle of a football field echoes less well? Should I discard the echo, rather than checking it for (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
| | | Re: frame RCX reply how
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| (...) Anyone know more specifically where to read how Lejos frames standard RCX IR replies? Does Lejos even include any .java code that runs on the PC? I mean to be asking how a PC should frame the standard replies from Lego RCX fimware, not how a (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx.java)
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Message is in Reply To:
| | frame RCX reply how
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| Anybody know how to divide the bytes incoming from the RCX IR replies into correct frames, preferably using javax.comm on a Linux/Windows PC? I'm told I might want to: 1) Expect first an exact echo of the command packet. 2) Expect the reply code to (...) (22 years ago, 31-Jan-03, to lugnet.robotics.rcx)
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