2023-09-20 01:57:44 +08:00
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# Copyright (c) 2023 Espressif Systems (Shanghai) Co., Ltd.
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Zephyr input touch sensor parent node
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This defines a group of touch sensors that can generate input events. Each touch
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sensor is defined in a child node of the touch-sensor node and defines a specific key
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code.
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For example:
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#include <zephyr/dt-bindings/input/input-event-codes.h>
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#include <zephyr/dt-bindings/input/esp32-touch-sensor-input.h>
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&touch {
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compatible = "espressif,esp32-touch";
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status = "okay";
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debounce-interval-ms = <30>;
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href-microvolt = <27000000>;
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lref-microvolt = <500000>;
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href-atten-microvolt = <1000000>;
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filter-mode = <ESP32_TOUCH_FILTER_MODE_IIR_16>;
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filter-debounce-cnt = <1>;
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filter-noise-thr = <ESP32_TOUCH_FILTER_NOISE_THR_4_8TH>;
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filter-jitter-step = <4>;
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filter-smooth-level = <ESP32_TOUCH_FILTER_SMOOTH_MODE_IIR_2>;
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touch_sensor_0 {
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2024-04-08 17:57:39 +08:00
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channel-num = <1>;
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channel-sens = <20>;
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2023-09-20 01:57:44 +08:00
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zephyr,code = <INPUT_KEY_0>;
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};
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};
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compatible: "espressif,esp32-touch"
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include: base.yaml
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properties:
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debounce-interval-ms:
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type: int
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default: 30
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description: Debouncing interval time in milliseconds.
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href-microvolt:
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type: int
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enum:
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- 2400000
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- 2500000
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- 2500000
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- 2700000
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default: 2700000
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description: Touch sensor high reference voltage.
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lref-microvolt:
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type: int
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enum:
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- 500000
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- 600000
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- 700000
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- 800000
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default: 500000
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description: Touch sensor low reference voltage.
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href-atten-microvolt:
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type: int
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enum:
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- 1500000
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- 1000000
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- 500000
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- 0
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default: 1000000
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description: Touch sensor high reference attenuation voltage.
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filter-mode:
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type: int
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default: 2
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description: |
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Touch sensor IIR filter coefficient.
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If not specified defaults to ESP32_TOUCH_FILTER_MODE_IIR_16.
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filter-debounce-cnt:
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type: int
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default: 1
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description: |
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Touch sensor debounce count.
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If not specified defaults to 1.
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filter-noise-thr:
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type: int
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default: 0
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description: |
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Touch sensor noise threshold coefficient.
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If not specified defaults to ESP32_TOUCH_FILTER_NOISE_THR_4_8TH.
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filter-jitter-step:
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type: int
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default: 4
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description: |
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Touch sensor jitter filter step size.
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If not specified defaults to 4.
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filter-smooth-level:
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type: int
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default: 1
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description: |
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Touch sensor level of filter applied on the original data against large noise interference.
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If not specified defaults to ESP32_TOUCH_FILTER_SMOOTH_MODE_IIR_2.
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child-binding:
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description: Touch sensor child node
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properties:
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channel-num:
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type: int
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required: true
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description: Touch sensor channel number
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channel-sens:
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type: int
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default: 20
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description: |
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Touch sensor channel sensibility in 100th.
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If not specified defaults to 20.
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zephyr,code:
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type: int
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required: true
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description: Key code to emit.
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