144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
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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 "analog_joystick.h"
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#include "analog.h"
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#include "gpio.h"
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#include "wait.h"
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#include "timer.h"
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#include <stdlib.h>
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// Set Parameters
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#ifndef ANALOG_JOYSTICK_AUTO_AXIS
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uint16_t minAxisValue = ANALOG_JOYSTICK_AXIS_MIN;
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uint16_t maxAxisValue = ANALOG_JOYSTICK_AXIS_MAX;
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#else
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int16_t minAxisValues[2];
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int16_t maxAxisValues[2];
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#endif
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uint8_t maxCursorSpeed = ANALOG_JOYSTICK_SPEED_MAX;
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uint8_t speedRegulator = ANALOG_JOYSTICK_SPEED_REGULATOR; // Lower Values Create Faster Movement
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#ifdef ANALOG_JOYSTICK_WEIGHTS
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int8_t weights[101] = ANALOG_JOYSTICK_WEIGHTS;
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#endif
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int16_t xOrigin, yOrigin;
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uint16_t lastCursor = 0;
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uint8_t prevValues[2] = {0, 0};
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int16_t axisCoordinate(pin_t pin, uint16_t origin, uint8_t axis) {
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int8_t direction;
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int16_t distanceFromOrigin;
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int16_t range;
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int16_t position = analogReadPin(pin);
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if (origin == position) {
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return 0;
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} else if (origin > position) {
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distanceFromOrigin = origin - position;
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#ifdef ANALOG_JOYSTICK_AUTO_AXIS
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if (position < minAxisValues[axis]) {
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minAxisValues[axis] = position;
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}
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range = origin - minAxisValues[axis];
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#else
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range = origin - minAxisValue;
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#endif
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direction = -1;
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} else {
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distanceFromOrigin = position - origin;
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#ifdef ANALOG_JOYSTICK_AUTO_AXIS
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if (position > maxAxisValues[axis]) {
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maxAxisValues[axis] = position;
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}
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range = maxAxisValues[axis] - origin;
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#else
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range = maxAxisValue - origin;
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#endif
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direction = 1;
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}
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float percent = (float)distanceFromOrigin / range;
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int16_t coordinate = (int16_t)(percent * 100);
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if (coordinate < 0) {
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return 0;
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} else if (coordinate > 100) {
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return 100 * direction;
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} else {
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return coordinate * direction;
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}
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}
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int8_t axisToMouseComponent(pin_t pin, int16_t origin, uint8_t maxSpeed, uint8_t axis) {
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int16_t coordinate = axisCoordinate(pin, origin, axis);
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int8_t result;
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#ifndef ANALOG_JOYSTICK_WEIGHTS
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if (coordinate != 0) {
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float percent = (float)coordinate / 100;
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result = percent * maxCursorSpeed * (abs(coordinate) / speedRegulator);
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} else {
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return 0;
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}
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#else
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result = weights[abs(coordinate)] * (coordinate < 0 ? -1 : 1) * maxCursorSpeed / speedRegulator;
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#endif
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#ifdef ANALOG_JOYSTICK_CUTOFF
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uint8_t pv = prevValues[axis];
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prevValues[axis] = abs(result);
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if (pv > abs(result)) {
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return 0;
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}
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#endif
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return result;
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}
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report_analog_joystick_t analog_joystick_read(void) {
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report_analog_joystick_t report = {0};
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if (timer_elapsed(lastCursor) > ANALOG_JOYSTICK_READ_INTERVAL) {
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lastCursor = timer_read();
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report.x = axisToMouseComponent(ANALOG_JOYSTICK_X_AXIS_PIN, xOrigin, maxCursorSpeed, 0);
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report.y = axisToMouseComponent(ANALOG_JOYSTICK_Y_AXIS_PIN, yOrigin, maxCursorSpeed, 1);
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}
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#ifdef ANALOG_JOYSTICK_CLICK_PIN
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report.button = !readPin(ANALOG_JOYSTICK_CLICK_PIN);
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#endif
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return report;
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}
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void analog_joystick_init(void) {
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#ifdef ANALOG_JOYSTICK_CLICK_PIN
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setPinInputHigh(ANALOG_JOYSTICK_CLICK_PIN);
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#endif
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// Account for drift
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xOrigin = analogReadPin(ANALOG_JOYSTICK_X_AXIS_PIN);
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yOrigin = analogReadPin(ANALOG_JOYSTICK_Y_AXIS_PIN);
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#ifdef ANALOG_JOYSTICK_AUTO_AXIS
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minAxisValues[0] = xOrigin - 100;
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minAxisValues[1] = yOrigin - 100;
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maxAxisValues[0] = xOrigin + 100;
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maxAxisValues[1] = yOrigin + 100;
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#endif
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}
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