Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Feature: joystick weights #21883

Merged
merged 4 commits into from
Dec 1, 2023
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions docs/feature_pointing_device.md
Original file line number Diff line number Diff line change
Expand Up @@ -69,10 +69,29 @@ The Analog Joystick is an analog (ADC) driven sensor. There are a variety of jo
| `ANALOG_JOYSTICK_Y_AXIS_PIN` | (Required) The pin used for the horizontal/Y axis. | _not defined_ |
| `ANALOG_JOYSTICK_AXIS_MIN` | (Optional) Sets the lower range to be considered movement. | `0` |
| `ANALOG_JOYSTICK_AXIS_MAX` | (Optional) Sets the upper range to be considered movement. | `1023` |
| `ANALOG_JOYSTICK_AUTO_AXIS` | (Optional) Sets ranges to be considered movement automatically. | _not defined_ |
| `ANALOG_JOYSTICK_SPEED_REGULATOR` | (Optional) The divisor used to slow down movement. (lower makes it faster) | `20` |
| `ANALOG_JOYSTICK_READ_INTERVAL` | (Optional) The interval in milliseconds between reads. | `10` |
| `ANALOG_JOYSTICK_SPEED_MAX` | (Optional) The maximum value used for motion. | `2` |
| `ANALOG_JOYSTICK_CLICK_PIN` | (Optional) The pin wired up to the press switch of the analog stick. | _not defined_ |
| `ANALOG_JOYSTICK_WEIGHTS` | (Optional) Use custom weights for lever positions. | _not defined_ |
| `ANALOG_JOYSTICK_CUTOFF` | (Optional) Cut off movement when joystick returns to start position. | _not defined_ |

If `ANALOG_JOYSTICK_AUTO_AXIS` is used, then `ANALOG_JOYSTICK_AXIS_MIN` and `ANALOG_JOYSTICK_AXIS_MAX` are ignored.

By default analog joystick implementation uses `x^2` weighting for lever positions. `ANALOG_JOYSTICK_WEIGHTS` allows to experiment with different configurations that might feel better.

E.g. This is weights for `((x-0.4)^3+0.064)/0.282`:

```c
#define ANALOG_JOYSTICK_WEIGHTS {0,2,4,5,7,8,9,10,12,13,14,15,15,16,17,18,18,19,19,20,20,21,21,21,22,22,22,22,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,24,24,24,24,24,24,25,25,25,26,26,26,27,28,28,29,29,30,31,32,33,34,35,36,37,38,40,41,43,44,46,48,49,51,53,56,58,60,62,65,68,70,73,76,79,82,85,89,92,96,100}
```

You can use following JS code to generate weights for different formulas:

```js
JSON.stringify(Array.from(Array(101).keys()).map(x => Math.ceil((((x/100-0.4)**3+0.064)/0.282*100))))
```

### Azoteq IQS5XX Trackpad

Expand Down
68 changes: 58 additions & 10 deletions drivers/sensors/analog_joystick.c
Original file line number Diff line number Diff line change
Expand Up @@ -22,17 +22,28 @@
#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;

int16_t axisCoordinate(pin_t pin, uint16_t origin) {
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;
Expand All @@ -43,12 +54,27 @@ int16_t axisCoordinate(pin_t pin, uint16_t origin) {
return 0;
} else if (origin > position) {
distanceFromOrigin = origin - position;
range = origin - minAxisValue;
direction = -1;
#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;
range = maxAxisValue - origin;
direction = 1;

#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;
Expand All @@ -62,23 +88,38 @@ int16_t axisCoordinate(pin_t pin, uint16_t origin) {
}
}

int8_t axisToMouseComponent(pin_t pin, int16_t origin, uint8_t maxSpeed) {
int16_t coordinate = axisCoordinate(pin, origin);
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;
return percent * maxCursorSpeed * (abs(coordinate) / speedRegulator);
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);
report.y = axisToMouseComponent(ANALOG_JOYSTICK_Y_AXIS_PIN, yOrigin, maxCursorSpeed);
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);
Expand All @@ -93,4 +134,11 @@ void analog_joystick_init(void) {
// 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
}