On Thu, February 23, 2012 7:09 pm, mcd@is-sixsigma.com wrote:
> OK, this is truly strange.  I got an ICD3 a couple months ago, only
> recently have had time to play with it.  I've used it successfully on a
> number of 8 bit projects, but no joy on 16-bit projects.  I always get
> either no target or more commonly, target ID =3D 0;
>
> Well, one thing that was constant was that on 16 bit projects I was using
> the supplied cable but on 8 bit projects I was using a variety of cobbled
> up cables, some pretty bad.  So, suspecting Microchip's cable I made up
> another, and got the same result.
>
> Well, the other thing that is constant is that all the 16 bit things I
> tried were on Microchip boards; the 28 pin starter, Explorer 16, or
> PIC24FJ256DA210 board.  So as a last gasp, I stuck a 30F3013 on one of
> those stupid proto boards, used a very shaky cable, and it worked first
> time out!
>
> Now, the made up duplicate of the Microchip cable I made by carefully
> duplicating Microchip's cable.  Is it possible that the original cable wa=
s
> wired wrong?  Doesn't seem likely, but I did use the original cable as a
> guide, rather than the schematics.  But that cable bring wrong seems very
> far fetched.
>
> Is there something odd about Microchip's various experimenter boards?
> Same issue on three different boards seems equally unlikely.

I believe that the dsPIC33 and PIC24 communicate faster over the ICD3 than
previous parts- definitely try using a short cable.  When the ICD2 was
originally shipped, it came with a much longer RJ11 cable. Later cables
were shortened because of signal integrity. I ended up cutting down the
ICD2 cables I had and re-crimped ends on them. I made them as short as
possible- I never had a problem with a really short cable.

With a Microchip board and Microchip programmer, the RJ11 cable should be
crimped so that the tabs of the ends are on the same side of the (flat)
cable. I've seen 3rd party tools (Olimex in particular) that require an
RJ11 cable that require the tabs on opposite sides of the flat cable.



Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.