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High resolution scrolling (without feature report parsing) (#24423)

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* hires scrolling without feature report parsing

* fix valid range for exponent

* fix incorrect minimum exponent value documentation
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eynsai 2025-04-22 18:04:31 -04:00 • committed by GitHub
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docs/features/pointing_device.md
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@ -419,6 +419,32 @@ The `POINTING_DEVICE_CS_PIN`, `POINTING_DEVICE_SDIO_PIN`, and `POINTING_DEVICE_S
Any pointing device with a lift/contact status can integrate inertial cursor feature into its driver, controlled by `POINTING_DEVICE_GESTURES_CURSOR_GLIDE_ENABLE`. e.g. PMW3360 can use Lift_Stat from Motion register. Note that `POINTING_DEVICE_MOTION_PIN` cannot be used with this feature; continuous polling of `get_report()` is needed to generate glide reports.
:::
## High Resolution Scrolling
| Setting | Description | Default |
| ---------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- | ------------- |
| `POINTING_DEVICE_HIRES_SCROLL_ENABLE` | (Optional) Enables high resolution scrolling. | _not defined_ |
| `POINTING_DEVICE_HIRES_SCROLL_MULTIPLIER`| (Optional) Resolution mutiplier value used by high resolution scrolling. Must be between 1 and 127, inclusive. | `120` |
| `POINTING_DEVICE_HIRES_SCROLL_EXPONENT` | (Optional) Resolution exponent value used by high resolution scrolling. Must be between 0 and 127, inclusive. | `0` |
The `POINTING_DEVICE_HIRES_SCROLL_ENABLE` setting enables smooth and continuous scrolling when using trackballs or high-end encoders as mouse wheels (as opposed to the typical stepped behavior of most mouse wheels).
This works by adding a resolution multiplier to the HID descriptor for mouse wheel reports, causing the host computer to interpret each wheel tick sent by the keyboard as a fraction of a normal wheel tick.
The resolution multiplier is set to `1 / (POINTING_DEVICE_HIRES_SCROLL_MULTIPLIER * (10 ^ POINTING_DEVICE_HIRES_SCROLL_EXPONENT))`, which is `1 / 120` by default.
If even smoother scrolling than provided by this default value is desired, first try using `#define POINTING_DEVICE_HIRES_SCROLL_EXPONENT 1` which will result in a multiplier of `1 / 1200`.
The function `pointing_device_get_hires_scroll_resolution()` can be called to get the pre-computed resolution multiplier value as a `uint16_t`.
::: warning
High resolution scrolling usually results in larger and/or more frequent mouse reports. This can result in overflow errors and overloading of the host computer's input buffer.
To deal with these issues, define `WHEEL_EXTENDED_REPORT` and throttle the rate at which mouse reports are sent.
:::
::: warning
Many programs, especially those that implement their own smoothing for scrolling, don't work well when they receive simultaneous vertical and horizontal wheel inputs (e.g. from high resolution drag-scroll using a trackball).
These programs typically implement their smoothing in a way that assumes the user will only scroll in one axis at a time, resulting in slow or jittery motion when trying to scroll at an angle.
This can be addressed by snapping scrolling to one axis at a time.
:::
## Split Keyboard Configuration
The following configuration options are only available when using `SPLIT_POINTING_ENABLE` see [data sync options](split_keyboard#data-sync-options). The rotation and invert `*_RIGHT` options are only used with `POINTING_DEVICE_COMBINED`. If using `POINTING_DEVICE_LEFT` or `POINTING_DEVICE_RIGHT` use the common configuration above to configure your pointing device.