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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Sat, 31 Oct 1998 17:43:58 GMT
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Original-From:
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Bernd Unger <bernd.unger@augsburg.NOMORESPAMbaynet.de>
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Viewed:
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2069 times
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Hi Ronald!
Ok - my HB is working now. I got the right 1233-10 (10 means 10% of 5v -
reset
is going up on 4.5v). This seem to work better. Second thing is the 350ms
delay
seem to be necessary in normal reset.
The second thing was that the power supply on the board was relativly
unstable (dropped when i touched with an digital probe) till i finished the
last
step adding the L1 - 1 uH - iron core inductor. Since then the whole thing
works
stable!
Good luck in trying your board getting to work!
Bye
Bernd
> 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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