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Topic: learning interrupt (Read 614 times) previous topic - next topic


I'm trying to learn the Interrupt.
I've almost rewritten http://www.arduino.cc/playground/Main/PcInt without using pins_arduino.h libraries, just Regiter manipulation and ISR() routine.
But one function seems hard to replace: curr = *portInputRegister(port+2);
Seems what this function return the pins that has changed. I can simulate its work simply looking at PORTD ecc and saving the old state... but PORTX or PINX is always  0...
who can help me?
sei nuovo? non sai da dove partire? leggi qui: http://playground.arduino.cc/Italiano/Newbie

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