AM6442: ePWM Module Trigger for DMA Transaction

Stuart Baker

Part Number: AM6442

I'm working with a customer that is using the ePWM timer module in up/down counting mode. They want to trigger a DMA transaction that will update the ePWM duty cycle(s) at each peak and valley of the ePWM count. In other words, use the ePWM interrupt source as a DMA trigger event.

In looking through the TRM, I'm having difficulty determining for certain that this is possible, and further, how to do it.

If the ePWM cannot trigger the DMA directly, another timer source synchronous to the ePWM may be just as good, although likely requiring a more complex configuration.

Please help me understand:

Is this DMA trigger scenario possible?
What is the configuration required?

Thanks,

Stuart

over 2 years ago

+1 Kallikuppa Sreenivasa over 2 years ago

TI__Guru**** 224845 points

Hello Stuard,

Thank you for the query.

Please look at the above highlighted signal path.

PWM - > TIME_SYNCH_EVNT_INTR - > L2G - > DMA
There is one event sync from PWM, and that will create a DMA trigger. We currently don't have examples of this requirement.

Let me know if this helps.

regards,

Sreenivasa

0 Stuart Baker over 2 years ago in reply to Kallikuppa Sreenivasa

TI__Genius 10830 points

Sreenivasa,

I think this helps us for now. We may need to follow-up later for some additional detailed help on the configuration.

Thanks,

Stuart

0 Kallikuppa Sreenivasa over 2 years ago in reply to Stuart Baker

TI__Guru**** 224845 points

Hello Stuart,

Thank you for the note.

Regards,

Sreenivasa

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AM6442: ePWM Module Trigger for DMA Transaction