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qmk_firmware/docs/feature_pointing_device.md
Drashna Jaelre 2669b0bee8
[Docs] Add drag scrolling example to Pointing device docs page (#15715) 
Co-authored-by: Dasky <32983009+daskygit@users.noreply.github.com>
2022-01-06 00:30:22 -08:00

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Pointing Device :id=pointing-device

Pointing Device is a generic name for a feature intended to be generic: moving the system pointer around. There are certainly other options for it - like mousekeys - but this aims to be easily modifiable and hardware driven. You can implement custom keys to control functionality, or you can gather information from other peripherals and insert it directly here - let QMK handle the processing for you.

To enable Pointing Device, uncomment the following line in your rules.mk:

POINTING_DEVICE_ENABLE = yes

Sensor Drivers

There are a number of sensors that are supported by default. Note that only one sensor can be enabled by POINTING_DEVICE_DRIVER at a time. If you need to enable more than one sensor, then you need to implement it manually.

ADNS 5050 Sensor

To use the ADNS 5050 sensor, add this to your rules.mk

POINTING_DEVICE_DRIVER = adns5050

The ADNS 5050 sensor uses a serial type protocol for communication, and requires an additional light source.

Setting Description
ADNS5050_SCLK_PIN (Required) The pin connected to the clock pin of the sensor.
ADNS5050_SDIO_PIN (Required) The pin connected to the data pin of the sensor.
ADNS5050_CS_PIN (Required) The pin connected to the cable select pin of the sensor.

The CPI range is 125-1375, in increments of 125. Defaults to 500 CPI.

ADSN 9800 Sensor

To use the ADNS 9800 sensor, add this to your rules.mk

POINTING_DEVICE_DRIVER = adns9800

The ADNS 9800 is an SPI driven optical sensor, that uses laser output for surface tracking.

Setting Description Default
ADNS9800_CLOCK_SPEED (Optional) Sets the clock speed that the sensor runs at. 2000000
ADNS9800_SPI_LSBFIRST (Optional) Sets the Least/Most Significant Byte First setting for SPI. false
ADNS9800_SPI_MODE (Optional) Sets the SPI Mode for the sensor. 3
ADNS9800_SPI_DIVISOR (Optional) Sets the SPI Divisor used for SPI communication. varies
ADNS9800_CS_PIN (Required) Sets the Cable Select pin connected to the sensor. not defined

The CPI range is 800-8200, in increments of 200. Defaults to 1800 CPI.

Analog Joystick

To use an analog joystick to control the pointer, add this to your rules.mk

POINTING_DEVICE_DRIVER = analog_joystick

The Analog Joystick is an analog (ADC) driven sensor. There are a variety of joysticks that you can use for this.

Setting Description Default
ANALOG_JOYSTICK_X_AXIS_PIN (Required) The pin used for the vertical/X axis. not defined
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_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 maxiumum value used for motion. 2
ANALOG_JOYSTICK_CLICK_PIN (Optional) The pin wired up to the press switch of the analog stick. not defined

Cirque Trackpad

To use the Cirque Trackpad sensor, add this to your rules.mk:

POINTING_DEVICE_DRIVER = cirque_pinnacle_i2c

or

POINTING_DEVICE_DRIVER = cirque_pinnacle_spi

This supports the Cirque Pinnacle 1CA027 Touch Controller, which is used in the TM040040, TM035035 and the TM023023 trackpads. These are I2C or SPI compatible, and both configurations are supported.

Setting Description Default
CIRQUE_PINNACLE_X_LOWER (Optional) The minimum reachable X value on the sensor. 127
CIRQUE_PINNACLE_X_UPPER (Optional) The maximum reachable X value on the sensor. 1919
CIRQUE_PINNACLE_Y_LOWER (Optional) The minimum reachable Y value on the sensor. 63
CIRQUE_PINNACLE_Y_UPPER (Optional) The maximum reachable Y value on the sensor. 1471
CIRQUE_PINNACLE_TAPPING_TERM (Optional) Length of time that a touch can be to be considered a tap. TAPPING_TERM/200
CIRQUE_PINNACLE_TOUCH_DEBOUNCE (Optional) Length of time that a touch can be to be considered a tap. TAPPING_TERM/200
I2C Setting Description Default
CIRQUE_PINNACLE_ADDR (Required) Sets the I2C Address for the Cirque Trackpad 0x2A
CIRQUE_PINNACLE_TIMEOUT (Optional) The timeout for i2c communication with the trackpad in milliseconds. 20
SPI Setting Description Default
CIRQUE_PINNACLE_CLOCK_SPEED (Optional) Sets the clock speed that the sensor runs at. 1000000
CIRQUE_PINNACLE_SPI_LSBFIRST (Optional) Sets the Least/Most Significant Byte First setting for SPI. false
CIRQUE_PINNACLE_SPI_MODE (Optional) Sets the SPI Mode for the sensor. 1
CIRQUE_PINNACLE_SPI_DIVISOR (Optional) Sets the SPI Divisor used for SPI communication. varies
CIRQUE_PINNACLE_SPI_CS_PIN (Required) Sets the Cable Select pin connected to the sensor. not defined

Default Scaling/CPI is 1024.

Pimoroni Trackball

To use the Pimoroni Trackball module, add this to your rules.mk:

POINTING_DEVICE_DRIVER = pimoroni_trackball

The Pimoroni Trackball module is a I2C based breakout board with an RGB enable trackball.

Setting Description Default
PIMORONI_TRACKBALL_ADDRESS (Required) Sets the I2C Address for the Pimoroni Trackball. 0x0A
PIMORONI_TRACKBALL_TIMEOUT (Optional) The timeout for i2c communication with the trackpad in milliseconds. 100
PIMORONI_TRACKBALL_INTERVAL_MS (Optional) The update/read interval for the sensor in milliseconds. 8
PIMORONI_TRACKBALL_SCALE (Optional) The multiplier used to generate reports from the sensor. 5
PIMORONI_TRACKBALL_DEBOUNCE_CYCLES (Optional) The number of scan cycles used for debouncing on the ball press. 20
PIMORONI_TRACKBALL_ERROR_COUNT (Optional) Specifies the number of read/write errors until the sensor is disabled. 10

PMW 3360 Sensor

To use the PMW 3360 sensor, add this to your rules.mk

POINTING_DEVICE_DRIVER = pmw3360

The PMW 3360 is an SPI driven optical sensor, that uses a built in IR LED for surface tracking.

Setting Description Default
PMW3360_CS_PIN (Required) Sets the Cable Select pin connected to the sensor. not defined
PMW3360_CLOCK_SPEED (Optional) Sets the clock speed that the sensor runs at. 2000000
PMW3360_SPI_LSBFIRST (Optional) Sets the Least/Most Significant Byte First setting for SPI. false
PMW3360_SPI_MODE (Optional) Sets the SPI Mode for the sensor. 3
PMW3360_SPI_DIVISOR (Optional) Sets the SPI Divisor used for SPI communication. varies
PMW3360_LIFTOFF_DISTANCE (Optional) Sets the lift off distance at run time 0x02
ROTATIONAL_TRANSFORM_ANGLE (Optional) Allows for the sensor data to be rotated +/- 30 degrees directly in the sensor. 0

The CPI range is 100-12000, in increments of 100. Defaults to 1600 CPI.

Custom Driver

If you have a sensor type that isn't supported here, you can manually implement it, by adding these functions (with the correct implementation for your device):

void           pointing_device_driver_init(void) {}
report_mouse_t pointing_device_driver_get_report(report_mouse_t mouse_report) { return mouse_report; }
uint16_t       pointing_device_driver_get_cpi(void) { return 0; }
void           pointing_device_driver_set_cpi(uint16_t cpi) {}

!> Ideally, new sensor hardware should be added to drivers/sensors/ and quantum/pointing_device_drivers.c, but there may be cases where it's very specific to the hardware. So these functions are provided, just in case.

Common Configuration

Setting Description Default
POINTING_DEVICE_ROTATION_90 (Optional) Rotates the X and Y data by 90 degrees. not defined
POINTING_DEVICE_ROTATION_180 (Optional) Rotates the X and Y data by 180 degrees. not defined
POINTING_DEVICE_ROTATION_270 (Optional) Rotates the X and Y data by 270 degrees. not defined
POINTING_DEVICE_INVERT_X (Optional) Inverts the X axis report. not defined
POINTING_DEVICE_INVERT_Y (Optional) Inverts the Y axis report. not defined
POINTING_DEVICE_MOTION_PIN (Optional) If supported, will only read from sensor if pin is active. not defined

Callbacks and Functions

Function Description
pointing_device_init_kb(void) Callback to allow for keyboard level initialization. Useful for additional hardware sensors.
pointing_device_init_user(void) Callback to allow for user level initialization. Useful for additional hardware sensors.
pointing_device_task_kb(mouse_report) Callback that sends sensor data, so keyboard code can intercept and modify the data. Returns a mouse report.
pointing_device_task_user(mouse_report) Callback that sends sensor data, so user coe can intercept and modify the data. Returns a mouse report.
pointing_device_handle_buttons(buttons, pressed, button) Callback to handle hardware button presses. Returns a uint8_t.
pointing_device_get_cpi(void) Gets the current CPI/DPI setting from the sensor, if supported.
pointing_device_set_cpi(uint16_t) Sets the CPI/DPI, if supported.
pointing_device_get_report(void) Returns the current mouse report (as a mouse_report_t data structure).
pointing_device_set_report(mouse_report) Sets the mouse report to the assigned mouse_report_t data structured passed to the function.
pointing_device_send(void) Sends the current mouse report to the host system. Function can be replaced.
has_mouse_report_changed(old, new) Compares the old and new mouse_report_t data and returns true only if it has changed.

Manipulating Mouse Reports

The report_mouse_t (here "mouseReport") has the following properties:

  • mouseReport.x - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ to the right, - to the left) on the x axis.
  • mouseReport.y - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ upward, - downward) on the y axis.
  • mouseReport.v - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing vertical scrolling (+ upward, - downward).
  • mouseReport.h - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing horizontal scrolling (+ right, - left).
  • mouseReport.buttons - this is a uint8_t in which all 8 bits are used. These bits represent the mouse button state - bit 0 is mouse button 1, and bit 7 is mouse button 8.

To manually manipulate the mouse reports outside of the pointing_device_task_* functions, you can use:

  • pointing_device_get_report() - Returns the current report_mouse_t that represents the information sent to the host computer
  • pointing_device_set_report(report_mouse_t newMouseReport) - Overrides and saves the report_mouse_t to be sent to the host computer
  • pointing_device_send() - Sends the mouse report to the host and zeroes out the report.

When the mouse report is sent, the x, y, v, and h values are set to 0 (this is done in pointing_device_send(), which can be overridden to avoid this behavior). This way, button states persist, but movement will only occur once. For further customization, both pointing_device_init and pointing_device_task can be overridden.

Additionally, by default, pointing_device_send() will only send a report when the report has actually changed. This prevents it from continuously sending mouse reports, which will keep the host system awake. This behavior can be changed by creating your own pointing_device_send() function.

Also, you use the has_mouse_report_changed(new, old) function to check to see if the report has changed.

Examples

Custom Mouse Keycode

In this example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function.

case MS_SPECIAL:
    report_mouse_t currentReport = pointing_device_get_report();
    if (record->event.pressed) {
        currentReport.v = 127;
        currentReport.h = 127;
        currentReport.buttons |= MOUSE_BTN1;  // this is defined in report.h
    } else {
        currentReport.v = -127;
        currentReport.h = -127;
        currentReport.buttons &= ~MOUSE_BTN1;
    }
    pointing_device_set_report(currentReport);
    pointing_device_send();
    break;

Recall that the mouse report is set to zero (except the buttons) whenever it is sent, so the scrolling would only occur once in each case.

Drag Scroll or Mouse Scroll

A very common implementation is to use the mouse movement to scroll instead of moving the cursor on the system. This uses the pointing_device_task_user callback to intercept and modify the mouse report before it's sent to the host system.

enum custom_keycodes {
    DRAG_SCROLL = SAFE_RANGE,
};

bool set_scrolling = false;

report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
    if (set_scrolling) {
        mouse_report.h = mouse_report.x;
        mouse_report.v = mouse_report.y;
        mouse_report.x = mouse_report.y = 0
    }
    return mouse_report;
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    if (keycode == DRAG_SCROLL && record->event.pressed) {
        set_scrolling = !set_scrolling;
    }
    return true;
}

This allows you to toggle between scrolling and cursor movement by pressing the DRAG_SCROLL key.