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/*
* Copyright 2018 Jack Humbert <jack.humb@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "encoder.h"
#ifdef SPLIT_KEYBOARD
# include "split_util.h"
#endif
// for memcpy
#include <string.h>
#if !defined(ENCODER_RESOLUTIONS) && !defined(ENCODER_RESOLUTION)
# define ENCODER_RESOLUTION 4
#endif
#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
# error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
#endif
extern volatile bool isLeftHand;
static pin_t encoders_pad_a[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_A;
static pin_t encoders_pad_b[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_B;
#ifdef ENCODER_RESOLUTIONS
static uint8_t encoder_resolutions[NUM_ENCODERS] = ENCODER_RESOLUTIONS;
#endif
#ifndef ENCODER_DIRECTION_FLIP
# define ENCODER_CLOCKWISE true
# define ENCODER_COUNTER_CLOCKWISE false
#else
# define ENCODER_CLOCKWISE false
# define ENCODER_COUNTER_CLOCKWISE true
#endif
static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
static uint8_t encoder_state[NUM_ENCODERS] = {0};
static int8_t encoder_pulses[NUM_ENCODERS] = {0};
// encoder counts
static uint8_t thisCount;
#ifdef SPLIT_KEYBOARD
// encoder offsets for each hand
static uint8_t thisHand, thatHand;
// encoder counts for each hand
static uint8_t thatCount;
#endif
static uint8_t encoder_value[NUM_ENCODERS] = {0};
__attribute__((weak)) void encoder_wait_pullup_charge(void) {
wait_us(100);
}
__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) {
return true;
}
__attribute__((weak)) bool encoder_update_kb(uint8_t index, bool clockwise) {
return encoder_update_user(index, clockwise);
}
void encoder_init(void) {
#ifdef SPLIT_KEYBOARD
thisHand = isLeftHand ? 0 : NUM_ENCODERS_LEFT;
thatHand = NUM_ENCODERS_LEFT - thisHand;
thisCount = isLeftHand ? NUM_ENCODERS_LEFT : NUM_ENCODERS_RIGHT;
thatCount = isLeftHand ? NUM_ENCODERS_RIGHT : NUM_ENCODERS_LEFT;
#else // SPLIT_KEYBOARD
thisCount = NUM_ENCODERS;
#endif
#ifdef ENCODER_TESTS
// Annoying that we have to clear out values during initialisation here, but
// because all the arrays are static locals, rerunning tests in the same
// executable doesn't reset any of these. Kinda crappy having test-only code
// here, but it's the simplest solution.
memset(encoder_value, 0, sizeof(encoder_value));
memset(encoder_state, 0, sizeof(encoder_state));
memset(encoder_pulses, 0, sizeof(encoder_pulses));
static const pin_t encoders_pad_a_left[] = ENCODERS_PAD_A;
static const pin_t encoders_pad_b_left[] = ENCODERS_PAD_B;
for (uint8_t i = 0; i < thisCount; i++) {
encoders_pad_a[i] = encoders_pad_a_left[i];
encoders_pad_b[i] = encoders_pad_b_left[i];
}
#endif
#if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
// Re-initialise the pads if it's the right-hand side
if (!isLeftHand) {
static const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
static const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
for (uint8_t i = 0; i < thisCount; i++) {
encoders_pad_a[i] = encoders_pad_a_right[i];
encoders_pad_b[i] = encoders_pad_b_right[i];
}
}
#endif // defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
// Encoder resolutions is handled purely master-side, so concatenate the two arrays
#if defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
# if defined(ENCODER_RESOLUTIONS_RIGHT)
static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS_RIGHT;
# else // defined(ENCODER_RESOLUTIONS_RIGHT)
static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS;
# endif // defined(ENCODER_RESOLUTIONS_RIGHT)
for (uint8_t i = 0; i < NUM_ENCODERS_RIGHT; i++) {
encoder_resolutions[NUM_ENCODERS_LEFT + i] = encoder_resolutions_right[i];
}
#endif // defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
for (uint8_t i = 0; i < thisCount; i++) {
setPinInputHigh(encoders_pad_a[i]);
setPinInputHigh(encoders_pad_b[i]);
}
encoder_wait_pullup_charge();
for (uint8_t i = 0; i < thisCount; i++) {
encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
}
}
static bool encoder_update(uint8_t index, uint8_t state) {
bool changed = false;
uint8_t i = index;
#ifdef ENCODER_RESOLUTIONS
const uint8_t resolution = encoder_resolutions[i];
#else
const uint8_t resolution = ENCODER_RESOLUTION;
#endif
#ifdef SPLIT_KEYBOARD
index += thisHand;
#endif
encoder_pulses[i] += encoder_LUT[state & 0xF];
if (encoder_pulses[i] >= resolution) {
encoder_value[index]++;
changed = true;
encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
}
if (encoder_pulses[i] <= -resolution) { // direction is arbitrary here, but this clockwise
encoder_value[index]--;
changed = true;
encoder_update_kb(index, ENCODER_CLOCKWISE);
}
encoder_pulses[i] %= resolution;
#ifdef ENCODER_DEFAULT_POS
if ((state & 0x3) == ENCODER_DEFAULT_POS) {
encoder_pulses[i] = 0;
}
#endif
return changed;
}
bool encoder_read(void) {
bool changed = false;
for (uint8_t i = 0; i < thisCount; i++) {
uint8_t new_status = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
if ((encoder_state[i] & 0x3) != new_status) {
encoder_state[i] <<= 2;
encoder_state[i] |= new_status;
changed |= encoder_update(i, encoder_state[i]);
}
}
return changed;
}
#ifdef SPLIT_KEYBOARD
void last_encoder_activity_trigger(void);
void encoder_state_raw(uint8_t *slave_state) {
memcpy(slave_state, &encoder_value[thisHand], sizeof(uint8_t) * thisCount);
}
void encoder_update_raw(uint8_t *slave_state) {
bool changed = false;
for (uint8_t i = 0; i < thatCount; i++) { // Note inverted logic -- we want the opposite side
const uint8_t index = i + thatHand;
int8_t delta = slave_state[i] - encoder_value[index];
while (delta > 0) {
delta--;
encoder_value[index]++;
changed = true;
encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
}
while (delta < 0) {
delta++;
encoder_value[index]--;
changed = true;
encoder_update_kb(index, ENCODER_CLOCKWISE);
}
}
// Update the last encoder input time -- handled external to encoder_read() when we're running a split
if (changed) last_encoder_activity_trigger();
}
#endif
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