| .. _dac-sample: |
| |
| 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 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 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. |
| |
| 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: |
| |
| .. code-block:: console |
| |
| Generating sawtooth signal at DAC channel 1. |
| |
| .. note:: If the DAC is not supported, the output will be an error message. |