Joerg Wunsch schrieb:
Georg-Johann Lay <a...@gjlay.de> wrote:
Could anyone explain this to me? Is there any way around this
(still using macros)?
With macros? No way here.
Well: no way *at the preprocessor level*.
However, moving the comparison to the *compiler level* could work.
The values of e.g. DDRD and DDRB are expressions that can be compared
by the compiler. As the resulting comparison is constant at
compile-time, with optimization enabled, those code portions that can
never be reached (due to the compile-time constant comparisons) are
optimized away.
So, turn your
#if LED1_DDR == LED2_DDR
into
if (LED1_DDR == LED2_DDR) {
As I already wrote, the right C-level condition is
if (&LED1_DDR == &LED2_DDR)
You don't want to /read/ from the ports.
Johann
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