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