Lpc2000

Ashling have seen problems with the secondary debug port as well.
Sometimes it works, sometimes it doesn't. We have been able to
debug/flash via the secondary port, however, not consistently and
reliably. From a recent batch of twenty of our EVBA7 boards we had five
secondary debug failures. We are confident we are doing the right thing
and that it is not a tool issue (we have reproduced the problem with ARM
MultiICE as well).
 

Hugh @ http://www.ashling.com/support/lpc2100/  
 
 
 -----Original Message-----
From: Jim Beagley [mailto:jim5272@...] 
Sent: 21 January 2004 00:59
To: lpc2100@yahoogroups.com
Subject: [lpc2100] Re: Secondary JTAG problem. -> succesfull solution



Using the Primary for program, and then switching to secondary for
debug works fine. Attempting to program in Secondary mode fails at
every attempt, and only serves to corrupt the currently flashed
program, after which the primary port is required to aleviate the
problem. 

After programming with the primary port, I am able to switch my header
to Secondary, and debug from there.

Thank you for the help.

--- In lpc2100@yahoogroups.com, "Jim Beagley" <jim5272@h...> wrote:
> After Much hair pulling, I discovered you are partially correct. The
> IO pins must be set as "Input". port 0.27 - 0.31 all must be set as
> inputs, after this the device will come up under the secondary JTAG
> control.
> 
> HOWEVER - the connection can only be made marginally, sometimes it
> will, sometimes it wont. Reason unknown. After finally succesfully
> connecting using the Secondary JTAG, I tried to reprogram, and the
> program cycle failed (Right after it managed to erase the part), DOPE,
> now it's back to square 1.
> 
> My suggestion for would be users of this feature would be: Make sure
> you make your board such that no modification is required to switch
> between Primary, and Secondary JTAG. Use the Primary to program, and
> secondary to debug.
> 
> QUESTION: why does the pinsel block not actually disconnect the IO
> from the Direction register?
> 
> --- In lpc2100@yahoogroups.com, Robert Adsett <subscriptions@a...>
wrote:
> > Check through the notes on Philips microcontroller discussion list.
>  I seem 
> > to remember a mention that the pin directions had to be set to match
> what 
> > the JTAG required.
> > 
> > Robert
> > 
> > At 09:53 PM 1/20/04 +0000, you wrote:
> > >----------------------- assumption: ------------
> > >
> > >I have made the assumption that since the code 0x554000 has bee
placed
> > >into the pinsel1 register, the port direction register has no
effect
> > >on the pins any longer.
> > 
> > " 'Freedom' has no meaning of itself.  There are always
restrictions,
> > be they legal, genetic, or physical.  If you don't believe me, try
to
> > chew a radio signal. "
> > 
> >                          Kelvin Throop, III



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