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#3875 fix for rotary reverse direction dead spot #3895

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nmorse wants to merge 1 commit into from
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#3875 fix for rotary reverse direction dead spot #3895

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4 changes: 2 additions & 2 deletions ports/nrf/common-hal/rotaryio/IncrementalEncoder.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,10 +51,10 @@ static void _intr_handler(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action) {

// logic from the atmel-samd port: provides some damping and scales movement
// down by 4:1.
if (self->quarter >= 4) {
if (self->quarter > 0 && new_state == 2) {
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@nmorse nmorse Dec 30, 2020 •
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Oh a finer point might be to refactor this to be ever so slightly more efficient:

  1. switch the order of the conditional (new_state == 2 && self->quarter > 0) because the quarter will be non-zero more often than the state is 2
  2. I guess to go even further it could be refactored with an outer if clause and an inner case, perhaps like this:
if (new_state == 2 && self->quarter != 0) {
    if (self->quarter > 0) { // increment
        ...
    } else { // decrement 
        ...
    }
}

What do you think @dhalbert or anyone else?

self->position++;
self->quarter = 0;
} else if (self->quarter <= -4) {
} else if (self->quarter < 0 && new_state == 2) {
self->position--;
self->quarter = 0;
}
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