Subject:
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Re: pcode downloading
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 3 Jan 1997 00:17:55 GMT
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Original-From:
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Fred G. Martin <fredm@media.mit.edu&avoidspam&>
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Viewed:
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2353 times
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Here is the relevant part of the test instructions:
Finally, the MAX232's ability to transmit data to the host computer is
tested. Again using pin 7 of J9 as a ground reference, measure the
voltage at pin 3 of J9. This is the MAX232's serial output. It
should read -10 to -12 volts. Now temporarily jumper the -12 volt
supply (pin 6 of the MAX232) to pin 10 of the MAX232, which is the
input side of this output stage. Again measure the voltage at pin 3
of J9---it should now read +10 to +12 volts.
I assume you are successful in getting the -10 v out from pin 3 of J9
when nothing is attached -- what voltage do you get when you jumper
pins 6 and 10? You need to get at least +5v; this is the way that the
HB transmits back to the host computer.
It's surprising that this test would be bad but then DLM synced but
failed -- DLM's syncing would suggest that the comms work.
Wait a minute! There is a bogus version of the pcode file that might
not have been purged from all of the on-line sources. This version
erroneously loads values into the zero page of the 6811's memory-- the
very place where the bootstrap download routine is living. This will
corrupt the boot downloader while it is working. It looks like HBDL
is doing a sanity check and preventing the corruption (while also
aborting the download).
Please make sure that you get a fresh copy of pcode_hb.s19 from the
Handy Board software site, and let us know the result. Also, if this
does indeed turn out to be the problem, please let me know where you
got the bogus pcode file.
-Fred
>
> Happy New Year!
>
> I'm putting together a HandyBoard and am stuck at the point where
> pcode_hd.s19 is downloaded.
>
> Some details:
> Have a chip labled SIPEX SP232ACP as a substitute(?) for MAX232.
>
> During downloading using DLM the board syncs OK but generates an
> serial line echo error stating (wanted 50, got 3e).
>
> Using HBDL, makes it through boot loading, but generates the
> error: Error at address 0x0000 when attempting to download further.
>
> Everything has gone well up to this point with the exception of the last
> testing step in 3.2.2. Testing of the Interface/Charger Serial Circuit
> where I could not get a +9 to +10 volts when jumping pins 6 and 10 of the
> substitute for the MAX232.
>
> Thanks in advanced for any help.
>
> Karl R Altenburg altenbur@plains.NoDak.edu
> North Dakota State University, Fargo, ND 58105
>
> All things are artificial, for nature is the art of God. SIR THOMAS BROWNE
>
>
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Message has 1 Reply:
 | | Re: pcode downloading
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| (...) : (...) I get -8.9v when its not jumped. When jumped I get some floating values in the mV range. I checked all of the solder joints. Changed power supplies. Removed and reseated the chip. Checked power and continuity at various points around (...) (28 years ago, 3-Jan-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | pcode downloading
|
| Happy New Year! I'm putting together a HandyBoard and am stuck at the point where pcode_hd.s19 is downloaded. Some details: Have a chip labled SIPEX SP232ACP as a substitute(?) for MAX232. During downloading using DLM the board syncs OK but (...) (28 years ago, 2-Jan-97, to lugnet.robotics.handyboard)
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