Subject:
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Re: Psion 5mx firmware downloader
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 29 Sep 2001 11:29:08 GMT
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Viewed:
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1807 times
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Ian SMith <ian@achrn.demon.co.uk> wrote:
> Can anyone point me towards a description of teh method of a fast
> downloader? I couldn't find anything in teh above referenced pages
> (I might have missed it though). Sadly, I don't read C, but perl or basic
> or most unix shell scripts source would do.
As far as I know, the fast downloader is not documented except as C code.
There may also have been some posts to this newsgroup or the legos one back
when that code was written. I forget whether Marcus and I discussed this
more by e-mail or by newsgroup.
The fast downloader relies on a fast mode wich uses 4800 baud, no parity,
no complements, but still the 55 ff 00 headers and the checksum byte.
The steps to do the download are:
1) Detect the state of the RCX
See whether or not the RCX is in fast mode. This is done by sending an
alive message using the fast mode settings. If you get a valid
response, the RCX is in fast mode. If you get an invalid response, the
the RCX is probably in slow mode, but to make absolutely sure, send
another alive message using the normal settings. If a valid response is
received this time, the RCX is in slow mode. Otherwise there is trouble
and an error is reported.
2) If the RCX is in slow mode, download a short stub program
The program hacks the state of RCX to put it into fast mode. The
program you need to download is called fastdl.s and is part of the
lastest firmdl, located here:
http://graphics.stanford.edu/~kekoa/rcx/firmdl3.tar.gz
3) Download the real program in fast mode
Again, 4800 baud, no parity, no complements, but still the 55 ff 00
headers and the checksum byte. Unlock the firmware when done.
> While I'm at it, does anyone want a psion based firmware downloader?
What is Psion?
-Kekoa
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Message has 1 Reply:
 | | Re: Psion 5mx firmware downloader
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| (...) (snip account of fast download - thanks) (...) An electronics manufacturer. Specifically, in this case, manufacturer of a pda with a half-vga screen, a keyboard, built-in spreadsheet, word processing, email, databases etc.which is technically (...) (23 years ago, 29-Sep-01, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Psion 5mx firmware downloader
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| I've written a firmware downloader that runs on a Psion 5mx (and probably an older 5, but I haven't tested it). I should note this uses the IR tower connected to teh cable serial port (via lego's cable, psion's cable and a null modem adaptor, (...) (23 years ago, 29-Sep-01, to lugnet.robotics.rcx)
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