102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
/* Copyright 2020 Stephen J. Bush
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include QMK_KEYBOARD_H
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#include "etchamouse.h"
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#include "pointing_device.h"
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#if defined(POINTING_DEVICE_ENABLE) && defined(ENCODER_ENABLE)
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/** Track movement separately in both directions. This will allow us to
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* smooth out the movement along diagonals
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*/
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typedef struct {
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bool clockwise : 1;
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uint8_t count : 7;
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uint16_t timer : 16;
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uint16_t elapsed : 16;
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} key_tracker_t;
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static key_tracker_t tracker_x = {false, 0, 0, 0};
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static key_tracker_t tracker_y = {false, 0, 0, 0};
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/**
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* @brief Calculate the mouse move units for the given tracker.
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*
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* By using a key tracker rederence, we can minimize the amount of space
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* required on the stack. As we will have the tracker object, we will also
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* take the clockwise direction into account, which completely internalizes
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* the movement unit logic within this single function.
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*
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* @param tracker: Pointer to a key tracker object.
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* @return A integer from -127 to 127
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*/
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static int8_t move_unit(key_tracker_t *tracker) {
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if (0 == tracker->count) return 0;
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const uint16_t modifier = TAPPING_TERM_MOUSE_ENCODER < tracker->elapsed ? 1 : (TAPPING_TERM_MOUSE_ENCODER - tracker->elapsed) >> 1;
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uint16_t speed = MOUSEKEY_INITIAL_SPEED + MOUSEKEY_MOVE_DELTA * modifier * (tracker->count >> 1);
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/* convert speed to USB mouse speed 1 to 127 */
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speed = (uint8_t)(speed / (1000.0f / MOUSEKEY_INTERVAL));
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speed = speed < 1 ? 1 : speed;
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return (tracker->clockwise ? 1 : -1) * (speed > MOUSEKEY_MOVE_MAX ? MOUSEKEY_MOVE_MAX : speed);
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}
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/**
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* @brief Update key press tracker
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*
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* Update the time elapsed since the last keypress.
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* If the key has not been pressed since the tapping term, then reset the count to zero.
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* If the key was pressed, update the timer and increment the count.
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* Number of keypresses will degrade based on tapping term and zero out based
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* on the persistenc term.
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*
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* @param tracker: The object to update
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* @param pressed: A boolean indicating whether or not the key was pressed
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* @return None.
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*/
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static void update_tracker(key_tracker_t *tracker, bool pressed, bool clockwise) {
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tracker->elapsed = timer_elapsed(tracker->timer);
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if (pressed) {
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tracker->timer = timer_read();
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tracker->count += 1;
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tracker->clockwise = clockwise;
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} else if (TAPPING_TERM_PERSISTENCE < tracker->elapsed) {
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tracker->count = 0;
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} else if (TAPPING_TERM_MOUSE_ENCODER < tracker->elapsed) {
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tracker->count >>= 1;
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}
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}
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bool encoder_update_mouse(uint8_t index, bool clockwise) {
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report_mouse_t curr_report = pointing_device_get_report();
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update_tracker(&tracker_x, 0 == index, clockwise);
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update_tracker(&tracker_y, 1 == index, clockwise);
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curr_report.x += move_unit(&tracker_x);
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curr_report.y += move_unit(&tracker_y);
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pointing_device_set_report(curr_report);
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pointing_device_send();
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return true;
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}
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#endif
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