LPC MicrocontrollersのトピックRe: postmortem ETB trace

postmortem ETB trace

jimkiely — Sun, 20 Jan 2019 22:26:32 GMT

Is it possible to do postmortem debugging on the LPC43xx series (LPC4350 particilarly) using the ETB?

I can get ETB to display trace info if I run from LPCXpresso, MCUXpresso or Segger's Ozone.

But I really need to connect to a target that has been running normally (i.e not running from the debugger) and read and decode the ETB.

Is this possible with LPCXpresso, MCUXpresso or Segger's Ozone or with any other tool or combination of tools in the know universe?

Re: postmortem ETB trace

ZhangJennie — Tue, 22 Jan 2019 07:08:29 GMT

Hi Jim

I suggest you use SWO ITM trace.

Without debug tools attached, an ITM event will not halt the MCU, it will simply be ignored.
ITM operations could be left within production code, thereby allowing logging information to be captured simply

For more information, see

How to use ITM Printf

Overview of Trace support in LPCXpresso IDE

Have a great day,
Jun Zhang

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Re: postmortem ETB trace

jimkiely — Thu, 24 Jan 2019 13:37:27 GMT

I do not understand how ITM printf is related to postmortem debugging.

It does not provide the ability to back-trace where the dead device got hung.

It does not allow me to read the ETB, which has the back-trace information that I need.