Incremental rotary encoder with 128 PPR? For MIDI CC

[gfvalvo]

@ShermanP

The idea is to enable the interrupt on only one pin at a time. When that interrupt occurs, in the ISR you disable that interrupt and enable the interrupt on the other pin. So any bouncing that occurs on the pin that just generated the interrupt won't generate any more interrupts because interrupts on that pin have been disabled. The other pin should have changed state some time ago, and should be stable.

There's a complication when you change directions because the interrupt is enabled on the wrong pin. But this is solved by increasing the lookup table to 32 bytes, and including the indentity of the interrupting pin as the fifth bit of the index value.

You don't have to jump through all those hoops if you use the State Table Approach.

Here's one implementation of that approach: https://github.com/gfvalvo/NewEncoder