LPCXPresso1769 occasional SIGSTOP on debug

[lpcware]

Content originally posted in LPCWare by dragilla on Tue Jan 01 15:52:21 MST 2013
Hi,
I'm having occasional stops of the execusion of my program while debugging.
It then shows such stack:

Thread [1] <main> (Suspended : Signal : SIGSTOP:Stopped (signal))
0x1fff0080
0xfffffffe
0xfffffffe

And "No source available for "0x1fff0080" "
Is this normal? I guess not.
Why can this be happening?

[lpcware]

Content originally posted in LPCWare by CodeRedSupport on Thu Jan 03 01:18:09 MST 2013
Yes - you need a pull up on the ISP pin. For more details see the "SWD / JTAG Connectors and Pinout" FAQ at:

http://support.code-red-tech.com/CodeRedWiki/HardwareDebugConnections

Regards,
CodeRedSupport

[lpcware]

Content originally posted in LPCWare by serge on Thu Jan 03 00:37:06 MST 2013
If you want to avoid problems in the future (even with no tracks connected to those pins) you should mandatory use pull-up resistors. I never know beforehand in which environment people will use my devices so i never take any chance that it "could" work or not. :D

[lpcware]

Content originally posted in LPCWare by gbm on Wed Jan 02 05:34:47 MST 2013
A definitive answer from NXP would be useful. According to the manual, the internal pullups should be ok, assuming that we don't have any long traces connected to the pins and no strong EMI.

So, dear NXPers, please respond:
If there is no interference, no significant capacitancies and traces to P2.10 and RESET are short enough (say < 10 mm) , should these lines be pulled up externally for reliable operation?

[lpcware]

Content originally posted in LPCWare by dragilla on Wed Jan 02 04:53:20 MST 2013
Oops. I didn't come acros this post. Thank you Zero!

[lpcware]

Content originally posted in LPCWare by ex-kayoda on Wed Jan 02 04:47:52 MST 2013

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Quote: dragilla
I've read all the topics on this forum...

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:confused:

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Quote: Zero
Floating :eek::eek:

Reset and ISP should always be pulled up with external resistors :)

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See: http://knowledgebase.nxp.com/showthread.php?p=12376

[lpcware]

Content originally posted in LPCWare by karanmehta93 on Wed Jan 02 04:42:36 MST 2013
Software enabled Pull up is not applicable on P2.10. An external pullup is compulsary required with hardware. I had faced the same problem. Read the datasheet for further details.

[lpcware]

Content originally posted in LPCWare by dragilla on Wed Jan 02 02:21:43 MST 2013
I've read all the topics on this forum concerning 0x1fff0080 address (in bootloader) and it didn't help me much. My p2.10 pin is not pulled down.
It is not pulled up either. Should it be?
If it does have to be pulled up - can it be done in software or do I have to do it by hardware?

The problem is annoying because it is not regular and happens once in a while  for no obvious reasons.