1.11 DAC Waveform Generation
This example application shows how to use the DAC to generate a 1 kHz Sine or Sawtooth wave with a look up table.
Description
This example application shows how to use the DAC Peripheral library to generate a 1 kHz Sine or Sawtooth wave with look up table. DAC starts conversion on a trigger from a timer period interrupt configured to occur at every 10 microseconds. In this application, the number of the DAC samples in a look up table is 100.
Downloading and Building the Application
To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.
Path of the application within the repository is apps/dac/dac_wav_gen/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_c21n_xpro.X | MPLABX project for SAMC21N Xplained Pro Evaluation Kit |
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| sam_c21n_xpro.X | SAMC21N Xplained Pro Evaluation Kit |
Setting Up SAMC21N Xplained Pro Evaluation Kit
- Connect an oscilloscope to monitor pin 1 (DAC) of 2-pin header labeled DAC-OUT
- Connect the Debug USB port on the board to the computer using a micro USB cable
Running the Application
- Build and Program the application using its IDE
- Observe a sine wave of 1 kHz frequency on DAC output pins
- Press switch to toggle the waveform shape from sine wave to sawtooth wave and back
- Refer to the below table for DAC output pin and switch details:
Board DAC Output Pin Switch Name SAMC21N Xplained Pro Evaluation Kit Pin 1 (DAC) of 2-pin header labeled DAC-OUT SW0