Subject:
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Re: Help! Hanyboard Assembly Testing problem!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 15 Jan 2002 16:20:14 GMT
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Viewed:
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2691 times
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Sam, can you check the serial input circuit. if this is not correct,
then the 6811 won't stay in boot mode. make sure RP4 is a 1Kx4 resistor
pack (4 discrete resistors) and not a 1Kx7. also make sure R15 is
installed. see http://handyboard.com/schemv12/cpu.gif .
also, try putting it in boot mode without the serial interface
attached. this should be possible. see the serial debug instructs at
http://handyboard.com/faq/winindex.html to verify that your serial int
works right.
Fred
On Tuesday, January 15, 2002, at 02:01 AM, LightMan wrote:
> Ok,
>
> RP4 was fine.
> I've put a logic tester "MODA" line on the chip (from what I can figure,
> this is this pin that gets the signal from the stop switch), and it is
> recieving a signal when I press the stop switch.
>
> I verified that the reset pin was getting a signal from u12. It is.
>
> I also verified that that TxD pin recieves signals when I send data
> through
> the serial line. It does.
>
> So what could be wrong? I guess everyone's on vacation, or would have
> gotten a reply by now. Anyone here? Anyone? I'd really like to get
> this
> thing working.
>
> Sam
>
> "LightMan" <lightman@lightman.nospam.org> wrote in message
> news:Gpv72r.1E1@lugnet.com...
> > Hi!
> >
> > I'm still can't get the chip to go into bootstrap mode. I've double • checked
> > I've got all the components installed in the correct direction, and
> > inspected the entire board for shorts, and have found none! What can I • do??
> > I'll try resoldering the processor chip socket. I tried to search
> > for a • new
> > processor at Frys Electronics, but they don't have them... I'll try a
> > few
> > surplus warehouses tomorrow/Monday. Any ideas, anyone???
> >
> > The "power fluctuations" have gone away, as I have cleaned off all
> > extra
> > flux, and used a soft brush attached to a dremel tool to clean and
> > polish
> > the board (I hope that's all I've done ;-)... but it is a fairly soft • brush,
> > and hasn't seemed to damage the board at all.
> >
> > The "power leak" (Power light, and battery light stay on when power is
> > turned off, but only when charger board is connected.) is coming from • max232
> > chip on the charger/serial board. I remove the max 232 chip, plug
> > the 2
> > boards together, apply power to the charger board, and the problem goes
> > away. Is this "normal"? Looking at the HB schematics, pin 5 from the • RJ11
> > Jack goes through a few resistors, and connects to both the power led,
> > and
> > +5v, so if the max232 chip were to "leak" power to pin 5 of the RJ11
> > jack,
> > it would go to pin 5 on the HB, and power the board in some limited
> > way. • I
> > have replaced the max232 chip, and the problem is still there, so
> > either
> > this is normal, or there is something VERY weird going on.
> >
> > Also I don't understand how the processor can cause the green led to go • out,
> > when in bootstrap mode. it looks like the power led is directly
> > connected
> > via 2 resistors to a +5v supply. Hmm maybe I should test rp4? If rp4
> > was
> > bad, it could cause both these problems.
> >
> > Sam
> >
> >
> >
> > "LightMan" <Lightman@lightman.nospam.org> wrote in message
> > news:GpsqtI.FuI@lugnet.com...
> > > Hi!
> > >
> > > I'm putting together my shiny new HanyBoard. I've got to the point • where
> > > I'm testing the serial line/power led on the HanyBoard itself.
> > >
> > > The processor won't seem to go into bootstrap mode(ie, the green light • won't
> > > go out, and attempts to download the bootstrap code fail in IC).
> > >
> > > The previous testing step, testing the processor's clock seems to • work...
> > I
> > > have a logic probe, and pin 5 causes the logic probe to emit a fairly • fast
> > > blinking light, accompanied with a beeping sound.
> > >
> > > All other tests have passed as well. I have also tested the stop • switch,
> > to
> > > make sure it was functioning--it shorts when the button is pushed.
> > >
> > > Other things to note, that I find strange are:
> > > 1) somtimes the power led flickers once the board is fully powered. • This
> > > seemed lessened once I cleaned to bottom of the board with a pcb board
> > > cleaner/degreaser (I thought it might be good to get rid of some of
> > > the • flux
> > > from soldering). Also this rarely happens when the board is on • "external
> > > power" from the serial interface board/charger.
> > >
> > > 2) when powering the board from the serial interface board, and I
> > > power • off
> > > the handyboard using the switch, the power light will stay lit, and
> > > the
> > > battery light will also come on, so I may have some voltage getting
> > > onto • the
> > > board.
> > >
> > > 3) The download fails, but I appear to have com communications • correct...
> > I
> > > can see the serial light flicker as the PC attempts to d/l the boot • strap
> > > code. Also for some reason the power led on the handyboard will
> > > flicker
> > > when the boot strap code is downloaded.
> > >
> > > I would assume that I have some sort of tiny short somewhere, but I • don't
> > > know where to look. Any ideas?
> > >
> > > Sam
> >
> >
> >
> >
> >
> >
>
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