Digital-to-Analog Converter (DAC)

Overview

This sample demonstrates how to use the DAC driver API.

Building and Running

The DAC output is defined in the board's devicetree and pinmux file.

The board's :ref:`/zephyr,user <dt-zephyr-user>` node must have dac, dac-channel-id, and dac-resolution properties set. See the predefined overlays in :zephyr_file:`samples/drivers/dac/boards` for examples.

Building and Running for ST Nucleo L073RZ

The sample can be built and executed for the :ref:`nucleo_l073rz_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: nucleo_l073rz
   :goals: build flash
   :compact:

Building and Running for ST Nucleo L152RE

The sample can be built and executed for the :ref:`nucleo_l152re_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: nucleo_l152re
   :goals: build flash
   :compact:

Building and Running for ST Nucleo F767ZI

The sample can be built and executed for the :ref:`nucleo_f767zi_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: nucleo_f767zi
   :goals: build flash
   :compact:

Building and Running for ST Disco F3

The sample can be built and executed for the :ref:`stm32f3_disco_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: stm32f3_disco
   :goals: build flash
   :compact:

Building and Running for ST Nucleo F429ZI

The sample can be built and executed for the :ref:`nucleo_f429zi_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: nucleo_f429zi
   :goals: build flash
   :compact:

Building and Running for STM32L562E DK

The sample can be built and executed for the :ref:`stm32l562e_dk_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: stm32l562e_dk
   :goals: build flash
   :compact:

Building and Running for ST Nucleo L552ZE Q

The sample can be built and executed for the :ref:`nucleo_l552ze_q_board` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: nucleo_l552ze_q
   :goals: build flash
   :compact:

Building and Running for NXP TWR-KE18F

The sample can be built and executed for the :ref:`twr_ke18f` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: twr_ke18f
   :goals: build flash
   :compact:

DAC output is available on pin A32 of the primary TWR elevator connector.

Building and Running for NXP FRDM-K64F

The sample can be built and executed for the :ref:`frdm_k64f` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: frdm_k64f
   :goals: build flash
   :compact:

DAC output is available on connector J4 pin 11.

Building and Running for BL652

The BL652 DVK PCB contains a footprint for a MCP4725 to use as an external DAC. Note this is not populated by default. The sample can be built and executed for the :ref:`bl652_dvk` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: bl652_dvk
   :goals: build flash
   :compact:

DAC output is available on pin 1 of the MCP4725.

Building and Running for BL653

The BL653 DVK PCB contains a footprint for a MCP4725 to use as an external DAC. Note this is not populated by default. The sample can be built and executed for the :ref:`bl653_dvk` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: bl653_dvk
   :goals: build flash
   :compact:

DAC output is available on pin 1 of the MCP4725.

Building and Running for BL654

The BL654 DVK PCB contains a footprint for a MCP4725 to use as an external DAC. Note this is not populated by default. The sample can be built and executed for the :ref:`bl654_dvk` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: bl654_dvk
   :goals: build flash
   :compact:

DAC output is available on pin 1 of the MCP4725.

Building and Running for BL5340

The BL5340 DVK PCB contains a MCP4725 to use as a DAC. The sample can be built and executed for the :ref:`bl5340_dvk` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: bl5340_dvk_cpuapp
   :goals: build flash
   :compact:

DAC output is available on pin 1 of the MCP4725.

Building and Running for GD32450I-EVAL

The sample can be built and executed for the :ref:`gd32f450i_eval` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: gd32f450i_eval
   :goals: build flash
   :compact:

Bridge the JP23 to DAC with the jumper cap, then DAC output will available on JP7.

Building and Running for Longan Nano and Longan Nano Lite

The sample can be built and executed for the :ref:`longan_nano` as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: longan_nano
   :goals: build flash
   :compact:

also can run for the :ref: longan_nano_lite as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/dac
   :board: longan_nano_lite
   :goals: build flash
   :compact:

Sample output

You should see a sawtooth signal with an amplitude of the DAC reference voltage and a period of approx. 4 seconds at the DAC output pin specified by the board.

The following output is printed:

Generating sawtooth signal at DAC channel 1.

Note

If the DAC is not supported, the output will be an error message.