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PICList Thread
'[PIC] debugging tool'
2008\07\09@121621 by KPL

picon face
Hi!

IIRC there was some kind of small debugging tool described on
piclist.com, kind of pic-based device with display, which could
display messages sent from other PIC circuit under testing. I just
have no idea what to search for to find it.
I just want to learn a bit, but LCD interface wants too many pins,
serial connection to PC wants too many cycles.

Any ideas?

PS. I'm using linux, so pickit2 debugging is out of question.

--
KPL

2008\07\09@124724 by Alan B. Pearce

face picon face
>IIRC there was some kind of small debugging tool described on
>piclist.com, kind of pic-based device with display, which could
>display messages sent from other PIC circuit under testing. I just
>have no idea what to search for to find it.
>I just want to learn a bit, but LCD interface wants too many pins,
>serial connection to PC wants too many cycles.

There was a couple, Jinx had some form of display that went to another PIC
to display on an LCD IIRC, and one of the Bobs' used a morse type single pin
transmission to send register info out to another PIC for display.

Ah, found the latter, Bob Axtell had a message back in 2004 with the subject
line
'[PIC]:Bob's 1-Pin Diagnostic Signal (Was: The Read / Modify / Write stuff)'

2008\07\09@125627 by Rolf

face picon face
KPL wrote:
> Hi!
>
> IIRC there was some kind of small debugging tool described on
> piclist.com, kind of pic-based device with display, which could
> display messages sent from other PIC circuit under testing. I just
> have no idea what to search for to find it.
> I just want to learn a bit, but LCD interface wants too many pins,
> serial connection to PC wants too many cycles.
>
> Any ideas?
>
> PS. I'm using linux, so pickit2 debugging is out of question.
>
>  
Serial connection to PC doe snot take too many cycles if the PIC has a
UART.... which PIC are you testing?

Rolf

2008\07\09@130026 by Alan B. Pearce

face picon face
Found the second one which Dwayne Reid and Jinx posted back in August 2007
with subject line
'[PIC] simple & fast serial transmit routine'

2008\07\09@132301 by KPL

picon face
>>
> Serial connection to PC doe snot take too many cycles if the PIC has a
> UART.... which PIC are you testing?
>
> Rolf
>

Yes, but RX/TX pins can be used for something else, I would like if I
could change pins where debug tool is connected.


Alan, thanks. That's what I was looking for.

--
KPL

2008\07\09@142224 by Bob Axtell

face picon face
I have developed such a protocol, but the tool has not been made yet (to
read the signal).
Mine uses an IR beam for the output

Hi!
{Quote hidden}

> -

2008\07\09@142405 by Bob Axtell

face picon face
Yes, I can provide this if somebody wants. Send to spam_OUTengineerTakeThisOuTspamcotse.net.

On Wed, Jul 9, 2008 at 9:47 AM, Alan B. Pearce <.....A.B.PearceKILLspamspam@spam@rl.ac.uk> wrote:

{Quote hidden}

> -

2008\07\09@144703 by KPL

picon face
OK, I'm not sure any more this is what I was looking for:)

I had the latest of them in my mailbox,
But I was not there in 2004, so all I could find on the other one is:
www.piclist.com/techref/new/letter/news0402.htm?key=%22Diagnostic+Signal%22&from=
which does not tell much.

somehow I am not able to find that thread on piclist.com :( It shows
hundreds of hits or just the one above, depending on part of the
string I search. I am using quotes, I am trying to escape special
symbols like single quote, but that does not help.

May be that just means I should design that tool by myself:)


On Wed, Jul 9, 2008 at 8:22 PM, KPL <kpl.listesspamKILLspamgmail.com> wrote:
{Quote hidden}

--
KPL

2008\07\09@193639 by Jinx

face picon face
> May be that just means I should design that tool by myself:)

This was my contribution

http://www.piclist.com/techref/piclist/jinxlcdregmon.htm

(under 'Projects' at PIClist home page)

2008\07\09@202012 by Jinx

face picon face
> I just want to learn a bit, but LCD interface wants too many pins,
> serial connection to PC wants too many cycles.

BTW there are a couple of circuits out there for 2-pin serial using
a shift register. And you can pretty much do what you want with
any LCD pin, for example having the LCD in parallel with other
devices, if you leave EN alone until you actually want to exchange
(ie read or write) data with the screen

2008\07\09@211518 by Jinx

face picon face
part 1 425 bytes content-type:text/plain; (decoded 7bit)


> LCD interface wants too many pins

KPL, attached is an unusual multiplexing idea that you might find
useful if you have a keypad and LCD. I tried it briefly, seems to
work OK. Basically, two functions. Clock the 4040 and check the
i/p for a high that corresponds to the Q value, or clock the 4040
to the nybble data for the LCD. RS could be Q6, saves a pin,
takes a little more time


part 2 1843 bytes content-type:image/gif; (decode)


part 3 35 bytes content-type:text/plain; charset="us-ascii"
(decoded 7bit)

2008\07\09@212651 by Jinx

face picon face
> Clock the 4040 and check the i/p for a high that corresponds
> to the Q value

Sorry, that came out all wrong

Clock the 4040 to Q-1 and check for a low. IOW, in sequence,
set the 4040 outputs to a rotating 0 (11110, 11101, 11011 etc)

2008\07\09@231736 by Jinx

face picon face
Just having another look at that 4040 circuit (which is not mine
BTW, from a Silicon Chip project). As the 4040 reset is active
high, an RC on it would mean you could use EN, saving a pin

In theory then, an LCD and twelve push-buttons using 3 pins

2008\07\10@045530 by Alan B. Pearce

face picon face
>> I just want to learn a bit, but LCD interface wants too many pins,
>> serial connection to PC wants too many cycles.
>
>BTW there are a couple of circuits out there for 2-pin serial using
>a shift register.

Such as Myke Predkos one ...
http://www.rentron.com/Myke1.htm

2008\07\10@093328 by Enki

picon face
On 10 Jul 2008 at 9:53, Alan B. Pearce wrote:

> >> I just want to learn a bit, but LCD interface wants too many
> pins,
> >> serial connection to PC wants too many cycles.
> >
> >BTW there are a couple of circuits out there for 2-pin serial
> using
> >a shift register.
>
> Such as Myke Predkos one ...
> http://www.rentron.com/Myke1.htm
>

       That is a good one!  Recommended!

       Mark Jordan

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