topic Re: What is the routine that generates the hardfault_handler ecception ? in Processor Expert Software

What is the routine that generates the hardfault_handler ecception ?

_Ferrari_ — Wed, 30 Aug 2023 14:32:01 GMT

Dear all,

I am developing a project based on the LPC5526 processor.

Sometimes, during debugging, a HARDFAULT_HANDLER exception is generated, as shown in the image below.

Unfortunately, I cannot figure out at which execution phase the exception is generated, and in particular, the routine that generated it (there is no useful information in the call stack window)

Have you ever had problems like this? How did you solve them?

Thank you very much for your help and collaboration.

Best regards.

Re: What is the routine that generates the hardfault_handler ecception ?

Miguel04 — Wed, 30 Aug 2023 18:08:37 GMT

Hi @_Ferrari_

Can you provide the details of the software you are using? While debugging, what is the code line that is causing the fault?

Best Regards, Miguel.

Re: What is the routine that generates the hardfault_handler ecception ?

_Ferrari_ — Thu, 31 Aug 2023 22:03:53 GMT

I'm developing a software in 'C' and I'm not using FreeRTOS.
Unfortunately I don't know what code line causes the faut. Is there any register/memori location/Debbugging ifìnfo that I have to analyze to know what code line caesed the fault ?

thank you for your help and cooperation
rehards

Re: What is the routine that generates the hardfault_handler ecception ?

Miguel04 — Fri, 01 Sep 2023 16:25:08 GMT

Hi @_Ferrari_

The fault could be caused, for example, writing into a peripheral register that is not initialized.

Please debugg your code step-by-step with this MCUXpresso tool. Instead of clicking Resume, click step into and tell me where the fault is occured.

Can you tell me what are you coding? We could have a SDK example that can guide you.

Best Regards, Miguel.

Re: What is the routine that generates the hardfault_handler ecception ?

_Ferrari_ — Sat, 02 Sep 2023 14:11:36 GMT

Dear Miguel,
Thank you for youre reply.
The software that I'm developing is complex: it uses USB, SPI, I2C, FLASH, Digital I/O, Analog input and comparators. Unfortunately the 'HARDFAULT_HANDLER exception' is generated only once after months. But, if I have well undesrstood, ther is no possibility to know why the exception was generated simply looking the the debbugger information (the message in the red ellipse of the picture)

Thank you very much for your help and cooperation
regards

Re: What is the routine that generates the hardfault_handler ecception ?

ErichStyger — Sun, 03 Sep 2023 13:46:23 GMT

Hi @_Ferrari_ ,

I recommend that you add and use a special hardfault handler. I wrote about it here:

https://mcuoneclipse.com/2012/11/24/debugging-hard-faults-on-arm-cortex-m/

You can skip the first part about Processor Expert, and use the extend handler described in the second part of the article. The source code of it can be found here:

https://github.com/ErichStyger/McuOnEclipseLibrary/blob/master/lib/src/McuHardFault.c

That way you should see the PC and LR causing the hard fault.

I hope this helps,

Erich