> hard fault. I think it because of NULL pointer exception
Insted of thinking, put an assertion to verify that, and follow your
processor debugging instructions to understand the actual reason of the
hard fault.
Even your OS has a guide on that:
http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html
PS: I would honor and follow advice regarding memory allocation
functions, if I was you and I was chasing a fault on some error that
depends on the number of data being processed.
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