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Can't use hardware interrupt pins #3

@Jacotheron

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@Jacotheron

I am now using the Arduino Menu with a click encoder, and using this library (as is required by the Arduino Menu library), I am unable to use this on pins that have hardware interrupt (it simply does not do anything, while moving it to different pins works as intended - I want to use these pins for something else).

Can we perhaps modify the code to detect if the pin actually have hardware/dedicated interrupts and use that, falling back to the PCINT interrupts?

The reason is simple, on the Adafruit Feather M0, I have individual interrupts on every single pin exposed (no need to determine which one was used, as each can have its own interrupt handler).

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