- Previously the pulse counter used GCC's built-in functions for atomic memory
access. This PR changes this to use C11 atomics instead:
- Use of C11 atomics instead of atomic build-in functions makes the code
more portable and readable.
- Previously pulse_counter_reset() did not use an atomic function, so that
resets would be racy. (E.g. on the 8-bit AVR platform an 16-bit store is
not atomic, unless special care (like using C11 atomics) is taken.)
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