<avr/cpufunc.h>: Special AVR CPU functions -
This header file contains macros that access special functions of the AVR CPU
which do not fit into any of the other header files.
Macro Definition Documentation¶
Implement a read/write memory barrier
. A memory barrier instructs the
compiler to not cache any memory data in registers beyond the barrier. This
can sometimes be more effective than blocking certain optimizations by
declaring some object with a volatile qualifier.
See Problems with reordering code
for things to be taken into account
with respect to compiler optimizations.
Execute a no operation
(NOP) CPU instruction. This should not be used to
implement delays, better use the functions from <
> or < util/delay.h
> for this. For
debugging purposes, a NOP can be useful to have an instruction that is
guaranteed to be not optimized away by the compiler, so it can always become a
breakpoint in the debugger.
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