espressif,esp32-touch
Vendor: Espressif Systems
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>;
};
};
Properties
Top level properties
These property descriptions apply to “espressif,esp32-touch” nodes themselves. This page also describes child node properties in the following sections.
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
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Debouncing interval time in milliseconds.
Default value: |
|
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Touch sensor high reference voltage.
Default value: Legal values: |
|
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Touch sensor low reference voltage.
Default value: Legal values: |
|
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Touch sensor high reference attenuation voltage.
Default value: Legal values: |
|
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Touch sensor IIR filter coefficient.
If not specified defaults to ESP32_TOUCH_FILTER_MODE_IIR_16.
Default value: |
|
|
Touch sensor debounce count.
If not specified defaults to 1.
Default value: |
|
|
Touch sensor noise threshold coefficient.
If not specified defaults to ESP32_TOUCH_FILTER_NOISE_THR_4_8TH.
|
|
|
Touch sensor jitter filter step size.
If not specified defaults to 4.
Default value: |
|
|
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.
Default value: |
Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “espressif,esp32-touch” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
|
|
|
Power domain the device belongs to.
The device will be notified when the power domain it belongs to is either
suspended or resumed.
|
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|
Automatically configure the device for runtime power management after the
init function runs.
|
|
|
List of power states that will disable this device power.
|
|
|
indicates the operational status of a device
Legal values: See Important properties for more information. |
|
|
compatible strings
This property is required. See Important properties for more information. |
|
|
register space
See Important properties for more information. |
|
|
name of each register space
|
|
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interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
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name of each interrupt
|
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phandle to interrupt controller node
|
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
|
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Clock gate information
|
|
|
name of each clock
|
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number of address cells in reg property
|
|
|
number of size cells in reg property
|
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DMA channels specifiers
|
|
|
Provided names of DMA channel specifiers
|
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IO channels specifiers
|
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Provided names of IO channel specifiers
|
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mailbox / IPM channels specifiers
|
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Provided names of mailbox / IPM channel specifiers
|
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
Child node properties
Name |
Type |
Details |
|---|---|---|
|
|
Touch sensor channel number
This property is required. |
|
|
Touch sensor channel sensibility in 100th.
If not specified defaults to 20.
Default value: |
|
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Key code to emit.
This property is required. |