54 lines
1.4 KiB
YAML
54 lines
1.4 KiB
YAML
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# Copyright 2022, Basalte bv
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# SPDX-License-Identifier: Apache-2.0
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description: |
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SDL keyboard GPIO input Emulator
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Simulate GPIO state/interrupts using SDL keyboard events. This node has
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to be a child of a `zephyr,gpio-emul` compatible.
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Add a list of scancodes for the desired keys to be mapped.
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Refer to https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf
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section Keyboard/Keypad (p53) for a list of scancode values.
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The following example maps the first 3 numeric keys to GPIO pins:
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/* gpio0 has to be a zephyr,gpio-emul device */
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&gpio0 {
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ngpios = <3>;
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sdl_gpio {
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compatible = "zephyr,gpio-emul-sdl";
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scancodes = <30 31 32>;
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};
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};
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keypad: keypad {
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compatible = "gpio-keys";
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key1: key1 {
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gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
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};
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key1: key2 {
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gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
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};
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key3: key3 {
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gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
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};
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};
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The limitations of usage are:
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- Only active high as we don't get events for keys that aren't pressed
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- Pressing multiple keys is best effort, state will be kept but no events
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are generated once the last key is released
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compatible: "zephyr,gpio-emul-sdl"
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include: base.yaml
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properties:
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scancodes:
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type: array
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required: true
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description: |
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An array of SDL scancodes mapped to its GPIO index
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