HardFault_Handler and breadcrumbs

[mspenard603]

Hi All,

 This is an admittedly open ended question but... I've declared my own HardFault_Handler() and want it to dump information as to what function or 0x6xxxxxxx instruction caused the fault. How are others accomplishing this?

[RaRo]

Hello @mspenard603,

Could you please give us more details about what are you doing or trying to do? Also, which microcontroller and IDE are you using?

In the meantime, it could be useful to take a look to the following information related to HardFault in ARM microcontrollers:

• Using Cortex-M3/M4/M7 Fault Exceptions - An example of a HardFault handler that reports information about the underlying fault.
• Debugging Hard Faults on ARM Cortex-M | MCU on Eclipse - A step to step of how to debug hard faults in CodeWarrior.

Best regards, Raul.

[mspenard603]

iMXRT1062 and MCUxpresso 11.7.0

On a fault I'd like to know the call stack. But that's only available with Cortex-M0+ and its MTB I assume.

The program counter on a Hard Fault points to its ISR. So I'd like to know what previous instruction address caused the hard fault. I assume that's on stack. So I'm curious how others are approaching this and dumping stack.

[RaRo]

Hello @mspenard603,

You could obtain information about your HardFault in MCUXpresso IDE in Faults view.

[MCUXpresso IDE User Guide. Chapter 12. Debugging a Project. Section 12.7. Faults]

Also, could you please take a look at the following information?

• MCUXpresso IDE User Guide. Chapter 12. Debugging a Project. [Section 12.7. Faults]
• How to debug a HardFault on an ARM Cortex-M MCU | Interrupt

It could be useful.

Best regards, Raul.