TMS570LC4357: Use DMA to generate waveform through PWM

Hi Txema,

We can generate block transfer complete interrupt using DMA after a block of data transfer.

You can refer below example once:

0434.DMA_Memory_to_Memory_Transfer_RM57.zip

In above example i am doing a block of data memory to memory transfer, and after doing memory to memory transfer i configured to generate one block transfer interrupt. In that block transfer interrupt i am again triggering the transfer. I hope this would be useful for you.

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Thanks & regards,
Jagadish.

Hi Jagadish,

than you for your prompt answer. I guess I may have given too many details in my question and somehow "diluted" my biggest challenge with the intention to provide a more overall context of what I'm trying to do.

My biggest challenge is not so much setting up a DMA channel or getting the interrupt once it's done with the transfer.

What I don't get working is the PWM module requesting a new value to be loaded into the CMPA comparison register every time the PWM period is over.

This is what I have tried so far:

/* Enable DMA */
dmaEnable();

dmaEnableInterrupt(DMA_CH0, BTC, DMA_INTA); /* DMA_CH0 is highest priority */
dmaReqAssign(DMA_CH0, 42); /* Ch 42 in PWM6 SOCA */

While I have "Enable the ADC SOCA" checked and SOCASEL set to "CTR_PRD". I'm assuming that SOCA is the same as the one stated in the Programming Manual "SCI4 receive / ePWM6_SOCA / MIBSPI2[12] / MIBSPI4[12] / GIOB[2]"