espressif,esp32-dac
Vendor: Espressif Systems
Note
An implementation of a driver matching this compatible is available in drivers/dac/dac_esp32.c.
Description
Espressif Digital to Analog converter (DAC) control node
is part of the RTC low-power domain and belongs to the SENSE
peripherals set. RTC peripherals has GPIOs controlled by the
RTCIO mux, which is separated from the main IO mux.
Two GPIO pads can only be connected to the DAC peripheral.
ESP32 pads
- GPIO25 as DAC channel 1
- GPIO26 as DAC channel 2
ESP32-S2 pads
- GPIO17 as DAC channel 1
- GPIO18 as DAC channel 2
To enable the DAC peripheral it must be enabled in the board
dts, or in subsequent overlay file.
&dac {
status = "okay";
};
To specify the DAC channel to use, dts overlay must include
properties 'dac-channel-id', which uses zero based channel index.
Variable 'dac-resolution' must be also specified, although ESP32
only supported resolution is 8bits.
/ {
zephyr,user {
dac = <&dac>;
dac-channel-id = <0>;
dac-resolution = <8>;
};
};
NOTE: The DAC peripheral outputs are fixed to gpio pads, therefore
it does not need to be controlled by the pinctrl node.
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
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This property is required. Constant 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-dac” compatible.
Name |
Type |
Details |
|---|---|---|
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indicates the operational status of a device
Legal values: See Important properties for more information. |
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compatible strings
This property is required. See Important properties for more information. |
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register space
See Important properties for more information. |
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name of each register space
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interrupts for device
See Important properties for more information. |
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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
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name of each clock
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number of address cells in reg property
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number of size cells in reg property
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DMA channels specifiers
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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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Power domain specifiers
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Provided names of power domain specifiers
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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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.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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Specifier cell names
io-channel cells: output