Posted on August 03, 2017 at 13:29A Hard Fault handler should be able to determine the instructions causing the fault. Look at the stacked context, and registers, then look at the surrounding instructions against that context.
Other frequent causes of Hard Fault are touching memory inappropriately, or attempting to run ARM 32-bit code, often in external libraries. On the Cortex-M0 watch also for memory alignment faults, it can't load unaligned 32-bit values.
Use a proper Hard Fault Handler to dump the context, and look at the faulting code.
This is a topic I've covered here hundreds of times, please review some of the other threads.
