The mbed os sample code worked successfully on the LPC55S69 evaluation board from MCUxpresso.
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It’s unclear what ultimately caused the fault. I am not sure what was the final trigger, as I was changing the project settings while swapping some code around. Perhaps some combination of the above was accidentally enabled.
I’ve uploaded a worked project zip-file to github. Anyone should now be able to download it and check for reproducibility.
But I don’t know if the complex functionality works yet, as I’m only running a simple sample code.