Phillip,

ICD = In Circuit Debugger.

If you don't have one, here's another thing you can try.

You need an oscilloscope or logic probe:

write a little assembler macro or function that pulses a spare output
pin high then low. Call that macro at strategic spots in your code.
Watch the sceop to see when it triggers.
I use one that pulses a pin if the W register contains zero. Then,
call the macro from places in my code where I'm not sure what's
happening.

Neil

On 9/20/06, Phillip <pcoiner@gpssource.com> wrote:
> Hi Jan-Erik
>
> I got my NMEA parser working last night (sort of) but there is something
> funny with my check sum checking portion of it...it should have been the
> easy part. Once I tighten up the parser I'll go back and try to work out why
> I can't put my ISR where I want it.
>
> Now everything on the list makes sense with the exception of running att all
> through an ICD2?
> Although I have done two projects in assembler in the last couple of years,
> reading machine generated assembler is not one of my strengths......just
> reading my own code is difficult when it gets cold......even with abundant
> comments .......the old saw about practice making perfect leaps to mind
> here.
> Could I trouble you to further enlighten me on att all through an ICD2?
>
> Thanks again.
>
>
> Phillip
> Things should be as simple as possible but no simpler
>
>
>
> Phillip Coiner
> CTO, GPS Source, Inc.
>
>
> Your source for quality GNSS Networking Solutions and Design Services, Now!
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
> Jan-Erik Soderholm
> Sent: Wednesday, September 20, 2006 2:42 AM
> To: piclist@mit.edu
> Subject: RE: RE: RE: FW: [PIC] Trouble getting my ISR high
>
> Phillip wrote :
>
> > Do you guys have any suggestions on how best to
> > approach the finding the cause of my troubles?
>
> - Running att all through an ICD2.
>
> - Rewriting a small test-case in assembler so you
>   *realy* know what the code is doing.
>
> - Read the assembler listing from the compiler to try
>   to figure out what the compiler *realy* is doing.
>
> Jan-Erik.
>
>
>
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