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 20:02:59 GMT
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Viewed:
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4058 times
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"Pat LaVarre" <ppaatt@aol.com> wrote in message news:H9nAFD.7v@lugnet.com...
> > > 4) Before using (1) .. (3), begin by confirming
> > > the packet x 10 FE 10 FE can be sent and echoed.
> > > [Perhaps this packet rarely disturbs a standard RCX?]
> >
> > This is the PBAliveOrNot (or ping) packet type.
>
> Ouch, we may be framing the hex differently here, sorry.
>
> The only x10 Ping known to me is the x10/18 command op that gets embedded
> inside of a packet like x 55 FF 00 10 EF 10 EF to provoke a reply packet • like x
> 55 FF 00 18 E7 18 E7, or vice versa. But both of those packets have a 3 • byte x
> 55 FF 00 header that's missing from the packet x 10 FE 10 FE that ~kekoa
> firmdl3/rcx_comm.c rcx_wakeup_tower seemingly sends.
>
> > has the side-effect of reinitializing the toggle
> > bit used to determine repeat packet
>
> Until I'm more confident we're both framing the hex the same way, I of • course
> can't know if you mean that these 7 byte packets both have this effect or • the 4
> byte packet or something else.
>
> > Do you have the Minsdstorms SDK?
> > It covers all the standard LEGO packet types in detail:
> > http://mindstorms.lego.com/sdk2point5/default.asp
>
> Can anyone easily tell me more specifically where inside that SDK I should • find
> a description of what x 10 FE 10 FE means, as opposed to x 55 FF 00 10 EF
10 EF?
I follow you now (helps to look at the actual code ;-)... I would
expect that raw byte sequence to be ignored by the RCX - at least
I haven't seen anything in the docs to indicate that the RCX should
make some reply to that sequence.
> Awhile back rec.toys.lego told me to get those 4,241,521 bytes for me
> containing a "LEGO Mindstorms SDK.exe".
>
> I ran the .exe on a Windows machine to extract various .pdf. I think I
> remember I tried the Custom install, but it looked no different than • Typical,
> despite the hint in the Readme about having to ask if you want protocol • info.
> Uninstalling and reinstalling now does yield more in "Program Files/LEGO
> Software/LEGO Mindstorms SDK/Doc/", namely:
> TOWERAPI.HLP
> LEGO USB Tower Interface Reference.pdf
> LTSETUP.HLP
>
> For a moment I was guessing surely you meant I could find the "the • PBAliveOrNot
> (or ping) packet type" described in that new .pdf ... but I'm failing to • find
> it there ... can I? Or did you just mean to direct me into "LASM Byte
> Codes.pdf", page 12 of 108, titled "PBAliveOrNot(0x10)" and stating "The
> command tests for the presence of a P-brick and re-initialises the toggle • bit
> from the communication protocol in the RCX, when executed as a direct • command.
> When executed as a program command, it resets the power-down timer."
AFAIK, the link I provided is the latest SDK (version 2.5). It adds support
for the Spybots. If you already have the SDK 2.0, then I don't think
there's anything additional to help you out. Sorry if I implied otherwise.
Mark
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Message is in Reply To:
 | | Re: frame RCX reply how
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| (...) Ouch, we may be framing the hex differently here, sorry. The only x10 Ping known to me is the x10/18 command op that gets embedded inside of a packet like x 55 FF 00 10 EF 10 EF to provoke a reply packet like x 55 FF 00 18 E7 18 E7, or vice (...) (21 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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