48 lines
2.8 KiB
Markdown
48 lines
2.8 KiB
Markdown
---
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title: RGB Underglow Configuration
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sidebar_label: RGB Underglow
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---
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See the [RGB Underglow feature page](../features/underglow.md) for more details, including instructions for adding underglow support to a board.
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See [Configuration Overview](index.md) for instructions on how to change these settings.
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## Kconfig
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RGB underglow depends on [Zephyr's LED strip driver](https://github.com/zephyrproject-rtos/zephyr/tree/main/drivers/led_strip), which provides additional Kconfig options.
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Definition file: [zmk/app/Kconfig](https://github.com/zmkfirmware/zmk/blob/main/app/Kconfig)
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| Config | Type | Description | Default |
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| ------------------------------------ | ---- | ----------------------------------------------------- | ------- |
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| `CONFIG_ZMK_RGB_UNDERGLOW` | bool | Enable RGB underglow | n |
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| `CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER` | bool | Underglow toggling also controls external power | y |
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| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_STEP` | int | Hue step in degrees (0-359) used by RGB actions | 10 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_STEP` | int | Saturation step in percent used by RGB actions | 10 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_STEP` | int | Brightness step in percent used by RGB actions | 10 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_START` | int | Default hue in degrees (0-359) | 0 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_START` | int | Default saturation percent (0-100) | 100 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_START` | int | Default brightness in percent (0-100) | 100 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_SPD_START` | int | Default effect speed (1-5) | 3 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START` | int | Default effect index from the effect list (see below) | 0 |
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| `CONFIG_ZMK_RGB_UNDERGLOW_ON_START` | bool | Default on state | y |
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Values for `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START`:
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| Value | Effect |
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| ----- | ----------- |
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| 0 | Solid color |
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| 1 | Breathe |
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| 2 | Spectrum |
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| 3 | Swirl |
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:::note
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The `*_START` settings only determine the initial underglow state. Any changes you make with the [underglow behavior](../behaviors/underglow.md) are saved to flash after a one minute delay and will be used after that.
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:::
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## Devicetree
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ZMK does not have any Devicetree properties of its own. See the Devicetree bindings for [Zephyr's LED strip drivers](https://github.com/zephyrproject-rtos/zephyr/tree/main/dts/bindings/led_strip).
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See the [RGB underglow feature page](../features/underglow.md) for examples of the properties that must be set to enable underglow.
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