Subject:
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Re: Implementation question
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 28 Oct 1998 20:15:05 GMT
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Original-From:
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Bernd Unger <bernd.unger@augsburg/AvoidSpam/.baynet.de>
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Viewed:
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1565 times
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Hi All!
I'm having exactly the same problem! The download seem to work correctly
but after switching off and on the board again it seem not to start over.
I have momentarily used another reset device. I dont know exactly the
specification but it seem not to wait for 350ms to put the reset.
My suspect is this reset device - i will get the DS1233-10 soon and hope it
will
work then.
What i'm using is another LCD, but also based on the HD44780 controller,
what i think
is the important point.
Another thing i'm sure about if it is correct is that the current on the
board is only about
4.8volt (measure with an old analog device). Maybe the DC adapter i'm using
has not enough
power. Its build for 12V/1.25A but does only give about 11.0V although with
or without the handy
board connected.
Has anybody a idea what to do?
Is it a good sign if the download-mode does work and the second line of the
LCD is black?
Can the software be the problem?
Bye
Bernd
----------
> Von: Wijngaarde, Ronald <r.wijngaarde@intercai.nl>
> An: handyboard@media.mit.edu
> Betreff: Implementation question
> Datum: Samstag, 24. Oktober 1998 15:36
>
> I am busy building the HB but I cannot get it to work yet. Here are the
> symptoms.
> The serial board works as expected and performs all tests as described
> in the implementation manual. RAM and HC11 are installed as well as the
> LCD. I am using the sharp LCD. The only problem with the sharp is that
> the pins are placed in such a way that I need a flat cable to connect
> it.
>
> I have tried several downloaders to get the pcode into the board. Most
> of them tell me that the download went okay and some ever report the two
> step process went okay (first the bootstrap loader, than the program).
> But as soon as I try to reset the board and run IC version 2 or 3, it
> cannot find the Handy Board. The LCD shows a solid row of blocks. I also
> tried the pcode that runs the HB without the LCD, to no avail. IC
> version 3.x cannot even communicate with the board. It refuses to see
> the board and will not download anything.
>
> I suspect the reset circuitry. Is there a test that can be performed to
> make sure that data is actually downloaded into RAM before the board is
> Reset ? How crucial is the Dallas Semiconductor voltage monitor chip ?
> Can it be replaced by other, similar chips, like the one used in the
> rug-warrior original plans (8810) ?
>
> Regards,
> Ronald Wijngaarde
> The Netherlands
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