54 lines
1.4 KiB
YAML
54 lines
1.4 KiB
YAML
# Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Espressif Digital to Analog converter (DAC) control node
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is part of the RTC low-power domain and belongs to the SENSE
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peripherals set. RTC peripherals has GPIOs controlled by the
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RTCIO mux, which is separated from the main IO mux.
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Two GPIO pads can only be connected to the DAC peripheral.
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ESP32 pads
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- GPIO25 as DAC channel 1
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- GPIO26 as DAC channel 2
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ESP32-S2 pads
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- GPIO17 as DAC channel 1
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- GPIO18 as DAC channel 2
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To enable the DAC peripheral it must be enabled in the board
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dts, or in subsequent overlay file.
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&dac {
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status = "okay";
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};
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To specify the DAC channel to use, dts overlay must include
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properties 'dac-channel-id', which uses zero based channel index.
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Variable 'dac-resolution' must be also specified, although ESP32
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only supported resolution is 8bits.
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/ {
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zephyr,user {
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dac = <&dac>;
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dac-channel-id = <0>;
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dac-resolution = <8>;
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};
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};
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NOTE: The DAC peripheral outputs are fixed to gpio pads, therefore
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it does not need to be controlled by the pinctrl node.
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compatible: "espressif,esp32-dac"
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include: [dac-controller.yaml]
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properties:
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"#io-channel-cells":
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const: 1
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io-channel-cells:
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- output
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