LPC1768 Save hard fault context

[yakoinfinity]

Hi folks! 

I've been experiencing some troubles with an application on one client. For some reason, after some time of normal use, it locks up on a Hard fault and performs a watchdog reset (wich is the expected behaviour). It occurs every hour, sometimes 2 or 3 times.
But, since we can not reproduce the fault, i've thinking in the possibility of make some post-mortem debugging in site. 

There are a chance of saving the context (registers, PC) somewhere on the MCU, before it locks up and wait for watchdog reset?

Actually, i'm using default fault handlers, CMSIS Drivers and CoOs. MCU is LPC1768.

Any help will be welcome.

Regards,

Exequiel.

[carstengroen · Accepted solution]

Exequiel,

some good info can be found in Keil's appnote here: http://www.keil.com/appnotes/files/apnt209.pdf 

and here: Debugging a Cortex-M0 Hard Fault - Discussions - Embedded - Arm Community 

Hope this helps...