Subject:
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Re: Handy Board Problem: getting hb back into download mode
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 19 May 1997 23:00:36 GMT
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Original-From:
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Fred G. Martin <(fredm@media.)Spamcake(mit.edu)>
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Viewed:
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1836 times
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> The board has nothing plugged into it; the BATT and PWR LEDs flash on and
> then PWR remains on so I can not confirm the synptoms of the ds1233(U12)
> voltage monitor failure you suggested below.
Are you holding down the STOP button? With the board powered on, read
the voltage at pin 3 of the 6811. When pressing the STOP button, pin
3 should read between zero volts and 0.6v. Releasing the STOP button,
you should get 5v. If you get 5v WITH THE SWITCH HELD DOWN, the
switch is bad, or a PCB wire leading from the switch to the 6811 is
bad.
If you get zero to 0.6v on pin 3 when holding down STOP, but the PWR
LED refuses to go out when you turn the board on holding down STOP,
then you probably have a damaged 6811 that must be replaced.
-Fred
>
> Since .s19 goes into external RAM I won't try placing the HC11 chip into
> any other type of board. Are there any other 'brute force' methods
> (removing battery power, removing the external RAM from its socket to
> allow decay of values) or PCB test points that I could probe with a volt
> meter or scope.
>
> I haven't found this problem in the FAQ list nor seen it in the short time
> I've been on the HB mailing list.
>
> Thanks,
> Bob
>
> On Tue, 13 May 1997, Fred G. Martin wrote:
> > > persuing another tack of placing the HC11 chip into the socket of a
> > > different Evaluation Board in the hopes of downloading .s19 there and
> > > then putting it back into the hb socket. I'll let you know what happens
> >
> > this won't work!! the .s19 file goes into the external RAM chip on the
> > hb, NOT the 'hc11.
> >
> > pls check that you can or cannot get into DL mode when the board is
> > NOT plugged into anthing. DL mode is when BATT and PWR LEDs flash on,
> > then both off upon power-on.
> >
> > -fred
> >
> >
> >
> > > The red BATT LED was off so I can not confirm the symptoms. It will be
> > > Thursday am before I get to work on confirming the symptoms before
> > > on Thurs.
> > > Bob.
> > >
> > > On Mon, 12 May 1997, Fred G. Martin wrote:
> > >
> > > > you may have damaged the ds1233 chip. confirming symptoms:
> > > >
> > > > 1. the red BATT LED stays on.
> > > > 2. measure system voltage (+5v to gnd); e.g., at a sensor header, and
> > > > get 4.9 to 5.1 v.
> > > >
> > > > if these two tests are true, remove u12 (the ds1233-10) and see if you
> > > > can successfully download the runtime .s19 file. if so, it's pretty
> > > > conclusive that the ds1233 is bad.
> > > >
> > > > when running the board w/o the ds1233, the memory won't reliably hold
> > > > its contents between power cycles, but otherwise things should work.
> > > >
> > > > -fred
> > >
> > >
> > >
> > > Robert - Bob - Campanini
> > > 913/843-6412
> > > 2706 University Drive
> > > Lawrence, KS, 66049
> > >
> > > http:/www.eecs.ukans.edu/~rcampani
> > > **************************************
> > >
> > >
> >
>
>
> Robert - Bob - Campanini
> 913/843-6412
> 2706 University Drive
> Lawrence, KS, 66049
>
> http:/www.eecs.ukans.edu/~rcampani
> **************************************
>
>
>
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