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Concerning the parsing of LEGO packets, I've found these bits to be useful in coming up with a parsing algorithm: * Packets start with 0x55 * Individual bytes of a packet are sent with little or no delay in between bytes * Packets may or may not (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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| | Re: frame RCX reply how
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(...) ... (...) Corrected/ elaborated in [square brackets]. I found my error by comparing bricxcc to a delightfully inaccurate summary of ~kekoa on replies that I built some time ago. Except again, op 63/6B UploadRam I find only in in "LASM Byte (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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| | 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 (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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| | Re: frame RCX reply how
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(...) can be (...) This is the PBAliveOrNot (or ping) packet type. It has the side- effect of reinitializing the toggle bit used to determine repeat packets. Do you have the Minsdstorms SDK? It covers all the standard LEGO packet types in detail: (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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| | Re: frame RCX reply how
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(...) (URL) bytes Accordingly I'd now guess the firmdl3/rcx_comm.c algorithm for framing standard RCX replies is: (...) 1) Send the bytes of the command packet. 2) Loop to receive up to equally many bytes echoed. If 100ms elapses twice without (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx)
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| | Re: command framing as seen from kernel/program.lrkey_handler
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"Pat LaVarre" <ppaatt@aol.com> wrote in message news:H9n64q.B2p@lugnet.com... (...) I dunno, haven't found one yet, though. (...) choice (...) Touché. Yes, tables, overlooked that. (...) the (...) expensive (...) I think that smaller code size is (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx.legos)
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| | Re: command framing as seen from kernel/program.lrkey_handler
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(...) Mmmmm. I am curious, if that's ok. To get log2(xx) in O(1) time we could fetch (p[xx & -xx]) i.e. fetch our choice of the bytes at offset x 0 1 2 4 8 10 20 40 80 from some p we like. Merely standard C can't easily express that old idea without (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx.legos)
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| | 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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| | 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)
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| | Re: command framing as seen from kernel/program.lrkey_handler
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(...) (URL) The missing (key & -key) might interest people who haven't used log2 & - to (...) number (...) and (...) log2(key (...) If I'm interpreting your shorthand correctly: there's no fast way to execute log2() on the H8 (i.e. no O(1) (...) (22 years ago, 1-Feb-03, to lugnet.robotics.rcx.legos)
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