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