| # Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd. |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| 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. |
| |
| compatible: "espressif,esp32-dac" |
| |
| include: [dac-controller.yaml] |
| |
| properties: |
| |
| "#io-channel-cells": |
| const: 1 |
| |
| io-channel-cells: |
| - output |
