70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#if CIRCUITPY_ROTARYIO && CIRCUITPY_ROTARYIO_SOFTENCODER
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#include "shared-bindings/rotaryio/IncrementalEncoder.h"
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#include "shared-module/rotaryio/IncrementalEncoder.h"
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#include "common-hal/rotaryio/IncrementalEncoder.h"
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void shared_module_softencoder_state_init(rotaryio_incrementalencoder_obj_t *self, uint8_t quiescent_state) {
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self->state = quiescent_state;
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self->sub_count = 0;
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common_hal_rotaryio_incrementalencoder_set_position(self, 0);
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}
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void shared_module_softencoder_state_update(rotaryio_incrementalencoder_obj_t *self, uint8_t new_state) {
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static const int8_t transitions[16] = {
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0, // 00 -> 00 no movement
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-1, // 00 -> 01 3/4 ccw (11 detent) or 1/4 ccw (00 at detent)
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+1, // 00 -> 10 3/4 cw or 1/4 cw
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0, // 00 -> 11 non-Gray-code transition
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+1, // 01 -> 00 2/4 or 4/4 cw
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0, // 01 -> 01 no movement
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0, // 01 -> 10 non-Gray-code transition
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-1, // 01 -> 11 4/4 or 2/4 ccw
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-1, // 10 -> 00 2/4 or 4/4 ccw
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0, // 10 -> 01 non-Gray-code transition
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0, // 10 -> 10 no movement
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+1, // 10 -> 11 4/4 or 2/4 cw
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0, // 11 -> 00 non-Gray-code transition
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+1, // 11 -> 01 1/4 or 3/4 cw
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-1, // 11 -> 10 1/4 or 3/4 ccw
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0, // 11 -> 11 no movement
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};
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new_state &= 0x3;
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int idx = (self->state << 2) | new_state;
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self->state = new_state;
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int8_t sub_incr = transitions[idx];
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self->sub_count += sub_incr;
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if (self->sub_count >= self->divisor) {
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self->position += 1;
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self->sub_count = 0;
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} else if (self->sub_count <= -self->divisor) {
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self->position -= 1;
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self->sub_count = 0;
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}
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}
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mp_int_t common_hal_rotaryio_incrementalencoder_get_position(rotaryio_incrementalencoder_obj_t *self) {
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return self->position;
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}
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void common_hal_rotaryio_incrementalencoder_set_position(rotaryio_incrementalencoder_obj_t *self, mp_int_t position) {
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self->position = position;
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}
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mp_int_t common_hal_rotaryio_incrementalencoder_get_divisor(rotaryio_incrementalencoder_obj_t *self) {
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return self->divisor;
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}
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void common_hal_rotaryio_incrementalencoder_set_divisor(rotaryio_incrementalencoder_obj_t *self, mp_int_t divisor) {
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self->divisor = divisor;
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}
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#endif
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