Introduction
This example uses DAC to generate a ramp wave on the DAC output.
The example does the below
- Configures Timer to generate interrupt at a rate of 20KHz.
- Increments a variable alpha from 0 to 360 based on the output ramp wave frequency required.
- Scales alpha to the range of DAC output in the DAC Shadow register within the ISR.
- This repeated programming of the registers generates a ramp wave.
External Connections
- DAC output pin can be connected to an oscilloscope to view the ramp 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
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
With AM263X-LP
- 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, am263x-lp |
| Example folder | examples/drivers/dac/dac_ramp_wave/ |
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 ramp wave on DAC output pin.
See Also
DAC
Sample Output
Shown below is a sample output when the application is run,
DAC Ramp Wave Test Started ...
DAC Ramp Wave Test Passed!!
All tests have passed!!
Sample Output
1.8.20