Tips and tricks (4)
Once again, the tips deals with… interrupts 😉
I was in the process of developping a new version of my rotary encoder libray for which I wanted to be able to set pins and ports. I quickly faced the question of the ISR. Should I write three identical routines ? (blah!). Should I write an external routine called by the three ISRs ? (Not better).
The answer is: ISR_ALIASOF!
All you have to do is to write an Interrupt Service Request routine like this one
ISR(PCINT0_vect) {
// Put your stuff here
}
And add the next two lines of code
// Use PCINT0_vect for PCINT1_vect and PCINT2_vect ISR(PCINT1_vect, ISR_ALIASOF(PCINT0_vect)); ISR(PCINT2_vect, ISR_ALIASOF(PCINT0_vect));
PCINT1_vect and PCINT2_vect will be ‘trampolined” to PCINT0_vect !
End of game!
Read more about interrupts here