EPWM 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 configures ePWM0 and DMA as follows:

• ePWM0 is set up to generate PWM waveforms
• DMA channel 0 is set up to update the CMPAHR, CMPA, CMPBHR and CMPB every period with the next value in the configuration array. This allows the user to create a DMA enabled fifo for all the CMPx and CMPxHR registers to generate unconventional PWM waveforms.
• DMA channel 1 is set up to update the TBPHSHR, TBPHS, TBPRDHR and TBPRD every period with the next value in the configuration array.
• Other registers such as AQCTL can be controlled through the DMA as well by following the same procedure.

Block Diagram for EPWM DMA example

External Connections

EPWM0_A/B pin can be connected to an oscilloscope to view the waveform.

AM263X-CC

When using AM263x-CC with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)

• Capture waveform on HSEC Pin 49 for epwm0_A
• Capture waveform on HSEC Pin 51 for epwm0_B

AM263X-LP

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am263x-cc, am263x-lp
Example folder	examples/drivers/epwm/epwm_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)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

EPWM

Sample Output

Shown below is a sample output when the application is run,

EPWM DMA Test Started ...
EPWM DMA Test Passed!!
All tests have passed!!