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Anything related to hardware and software stacks, i.e. data structures managed using a LIFO (Last-In First-Out) policy.

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How to debug this I2C hard fault?

For future reference, you need to define DEBUG_DEFAULT_INTERRUPT_HANDLERS in your preprocessor macros to capture the real cause of the hardfault interrupt. Unfortunately, I don't know how to do this …
Alan Samet's user avatar