secondary jtag

Started by Shannon Holland July 2, 2004
So it would appear that I mostly have secondary JTAG working. I say
mostly as while I can debug using JTAG, I can't seem to program flash.
I'm using the Nohau Emul-ARM JTAG emulator - does anyone have any
experience with that?

When using the secondary jtag interface it's able to erase flash, but
then fails when trying to program. Might anyone have any suggestions as
to what might be up here?

I've sent email off to Nohau as well.

Thanks!

Shannon



An Engineer's Guide to the LPC2100 Series

----- Original Message -----
From: "Shannon Holland" <>
To: <>
Sent: Friday, July 02, 2004 5:47 AM
Subject: [lpc2000] secondary jtag > So it would appear that I mostly have secondary JTAG working. I say
> mostly as while I can debug using JTAG, I can't seem to program flash.
> I'm using the Nohau Emul-ARM JTAG emulator - does anyone have any
> experience with that?
>
> When using the secondary jtag interface it's able to erase flash, but
> then fails when trying to program. Might anyone have any suggestions as
> to what might be up here?

There is a good expanation of the secondary JTAG quirks here:

http://www.ashling.com/support/lpc2000/knowledge_base.html#

Leon





On Jul 1, 2004, at 11:21 PM, Leon Heller wrote:

> There is a good expanation of the secondary JTAG quirks here:
>
> http://www.ashling.com/support/lpc2000/knowledge_base.html#
>

That's a useful page - thanks! Lots of good info overall.

Looks like I'm doing everything correctly at my end, just some quirk in
the Nohau tools that's keeping them from programming flash. I will
follow up with them.

Shannon



--- In , Shannon Holland <holland@l...> wrote:
>
> On Jul 1, 2004, at 11:21 PM, Leon Heller wrote:
>
> > There is a good expanation of the secondary JTAG quirks here:
> >
> > http://www.ashling.com/support/lpc2000/knowledge_base.html#
> >
>
> That's a useful page - thanks! Lots of good info overall.
>
> Looks like I'm doing everything correctly at my end, just some quirk in
> the Nohau tools that's keeping them from programming flash. I will
> follow up with them.
>
> Shannon

Shannon,
It made all the difference in mine when I just removed the JCLK pi
alltogether. I am using the same setup as you are. One note, I still
have to switch back and forth, as the secondary will occaisonally
still fail, and force me to use the Pri. JTAG to get code back in the
part.

Jim B.



--- In , "Jim Beagley" <jim5272@h...> wrote:
> --- In , Shannon Holland <holland@l...> wrote:
> >
> > On Jul 1, 2004, at 11:21 PM, Leon Heller wrote:
> >
> > > There is a good expanation of the secondary JTAG quirks here:
> > >
> > > http://www.ashling.com/support/lpc2000/knowledge_base.html#
> > >
> >
> > That's a useful page - thanks! Lots of good info overall.
> >
> > Looks like I'm doing everything correctly at my end, just some
quirk in
> > the Nohau tools that's keeping them from programming flash. I will
> > follow up with them.
> >
> > Shannon
>
> Shannon,
> It made all the difference in mine when I just removed the JCLK pi
> alltogether. I am using the same setup as you are. One note, I still
> have to switch back and forth, as the secondary will occaisonally
> still fail, and force me to use the Pri. JTAG to get code back in the
> part.
>
> Jim B.

---- sorry for the SPAM, but the pin i removed was JTAG_RTCK
Work great ever since.




On Tuesday, July 6, 2004, at 02:54 PM, Jim Beagley wrote:

>> It made all the difference in mine when I just removed the JCLK pi
>> alltogether. I am using the same setup as you are. One note, I still
>> have to switch back and forth, as the secondary will occaisonally
>> still fail, and force me to use the Pri. JTAG to get code back in the
>> part.
>>
>> Jim B.
>
> ---- sorry for the SPAM, but the pin i removed was JTAG_RTCK
> Work great ever since.
>

Hmmm, ok - thanks! I will try that.

Shannon