Introduction

This example configures an ePWM instance and DMA as follows:

ePWMx 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

For AM263x-CC or AM263Px-CC: EPWM0_A/B pin can be connected to an oscilloscope to view the waveform.
For AM263x-LP or AM263Px-LP: EPWM1_A/B pin can be connected to an oscilloscope to view the waveform.

When using AM263x-CC or AM263PX-CC with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)

When using AM263x-LP or AM263PX-LP

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am263px-cc, am263px-lp
Example folder	examples/drivers/epwm/epwm_dma

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

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

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

EPWM DMA waveform