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Ah, yes. That's it. It takes multiple passes of loop to "burn off" the accumulated microseconds since initialization of global variables prior to execution of setup().

Another "fix" is to define...

I can't explain it yet, but initializing g_rising_edge_timer at the end of setup() does fix the problem. I'm using Arduino 1 IDE, TD 1.58b3. Try it.



#include <Arduino.h>

const uint8_t...

You're right, the symptom doesn't match the logic of the fix, but I'd still do it, just to be eliminate any uncertainty in conditions on first execution of loop(). After that, I would use...

Thanks, luni. Good to know. I still think he should add the initialization of g_rising_edge_timer before leaving setup(), just to be sure that the conditions on first pass through loop() are he same...

Try defining your output pin using a macro instead of a variable, which will allow the inline function digitalWriteFast() to do more optimization, and add these two lines after call to pinMode() in...