Introduction
This example uses DMA to generate a sine wave on the DAC output.
Module Block diagram
The example does the below
- Configures Timer to generate DMA trigger at a rate of 20KHz.
- Calculates sine values and stores it in a buffer (sine table).
- Uses DMA to transfer sine values stored in the sine table to DAC.
- This repeated programming of the DAC registers generates a sine wave.
- The generated output can be viewed throug an oscilloscope on the DAC output pin.
External Connections
- DAC output pin can be connected to an oscilloscope to view the sine wave output.
AM263X-CC
Note: To use the reference voltage generated on ControlCard, make sure that the System VREF source select switch SW8 on ControlCard is set to position 1-2
When using AM263x-CC with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)
- Capture waveform on HSEC Pin 9
AM263X-LP
With AM263X-LP Note: To use the reference voltage generated on LaunchPad, make sure that the DAC_VREF source select switch S1 on LaunchPad is set to position 1-2
- Capture the waveform on boosterpack header J1/J3 Pin 30
Supported Combinations
Parameter | Value |
CPU + OS | r5fss0-0 nortos |
Toolchain | ti-arm-clang |
Board | am263x-cc |
Example folder | examples/drivers/dac/dac_sine_dma/ |
Steps to Run the Example
- When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
- When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
- Establish connections as mentioned in External Connections section
- Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
- Use an Oscilloscope to view the sine wave on DAC output pin.
See Also
DAC
Sample Output
Shown below is a sample output when the application is run,
DAC Sine DMA Test Started ...
DAC Sine DMA Test Passed!!
All tests have passed!!
Sample Output