DAC Sine DMA

Table of Contents

• Introduction
• External Connections
  • AM263X-CC
  • AM263X-LP
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

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

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!!