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feat(docs): Update display config docs

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Joel Spadin 2022-04-29 20:46:23 -05:00 committed by Dom H
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docs/docs/config/displays.md
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@ -22,22 +22,39 @@ Definition files:
| `CONFIG_ZMK_WIDGET_OUTPUT_STATUS` | bool | Enable a widget to show the current output (USB/BLE) | y |
| `CONFIG_ZMK_WIDGET_WPM_STATUS` | bool | Enable a widget to show words per minute | n |
If `CONFIG_ZMK_DISPLAY` is enabled, exactly one of the following options must be set to `y`:
If `CONFIG_ZMK_DISPLAY` is enabled, exactly zero or one of the following options must be set to `y`. The first option is used if none are set.
| Config | Type | Description | Default |
| ------------------------------------------- | ---- | ------------------------------ | ------- |
| `CONFIG_ZMK_DISPLAY_STATUS_SCREEN_BUILT_IN` | bool | Use the built-in status screen | y |
| `CONFIG_ZMK_DISPLAY_STATUS_SCREEN_CUSTOM` | bool | Use a custom status screen | n |
| Config | Description |
| ------------------------------------------- | ------------------------------ |
| `CONFIG_ZMK_DISPLAY_STATUS_SCREEN_BUILT_IN` | Use the built-in status screen |
| `CONFIG_ZMK_DISPLAY_STATUS_SCREEN_CUSTOM` | Use a custom status screen |
You must also configure the Zephyr driver for your display. Here are the Kconfig options for common displays.
If `CONFIG_ZMK_DISPLAY` is enabled, exactly zero or one of the following options must be set to `y`. The first option is used if none are set.
- [SSD1306](https://docs.zephyrproject.org/latest/reference/kconfig/CONFIG_SSD1306.html)
| Config | Description |
| ----------------------------------------- | ----------------------------------------- |
| `CONFIG_ZMK_DISPLAY_WORK_QUEUE_SYSTEM` | Use the system main thread for UI updates |
| `CONFIG_ZMK_DISPLAY_WORK_QUEUE_DEDICATED` | Use a dedicated thread for UI updates |
Using a dedicated thread requires more memory but prevents displays with slow updates (e.g. E-paper) from delaying key scanning and other processes. If enabled, the following options configure the thread:
| Config | Type | Description | Default |
| ------------------------------------------------ | ---- | ---------------------------- | ------- |
| `CONFIG_ZMK_DISPLAY_DEDICATED_THREAD_STACK_SIZE` | int | Stack size for the UI thread | 2048 |
| `CONFIG_ZMK_DISPLAY_DEDICATED_THREAD_PRIORITY` | int | Priority for the UI thread | 5 |
You must also configure the driver for your display. ZMK provides the following display drivers:
- [IL0323](https://github.com/zmkfirmware/zmk/blob/main/app/drivers/display/Kconfig.il0323)
Zephyr provides several display drivers as well. Search for the name of your display in [Zephyr's Kconfig options](https://docs.zephyrproject.org/latest/kconfig.html) documentation.
## Devicetree
See the Zephyr Devicetree bindings for your display. Here are the bindings for common displays:
See the Devicetree bindings for your display. Here are the bindings for common displays:
- [SSD1306 (i2c)](https://docs.zephyrproject.org/latest/reference/devicetree/bindings/solomon,ssd1306fb-i2c.html)
- [SSD1306 (spi)](https://docs.zephyrproject.org/latest/reference/devicetree/bindings/solomon,ssd1306fb-spi.html)
- [IL0323](https://github.com/zmkfirmware/zmk/blob/main/app/dts/bindings/display/gooddisplay%2Cil0323.yaml)
- [SSD1306 (i2c)](https://docs.zephyrproject.org/latest/build/dts/api/bindings/display/solomon,ssd1306fb-i2c.html)
- [SSD1306 (spi)](https://docs.zephyrproject.org/latest/build/dts/api/bindings/display/solomon,ssd1306fb-spi.html)
A full list of supported drivers can be found in [Zephyr's Devicetree bindings index](https://docs.zephyrproject.org/latest/reference/devicetree/bindings.html).
A full list of drivers provided by Zephyr can be found in [Zephyr's Devicetree bindings index](https://docs.zephyrproject.org/latest/build/dts/api/bindings.html).