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UCD3138A: UCD3138 DPWM end of period flag

A.R.f.
Intellectual 570 points
Part Number: UCD3138A

Dear TI,

I need to check or get informed when one period of DPWM operation is complete. I would prefer not to use an interrupt.

I guess that DPWMINT.PRD flag could be used for that, but I can't see it set. Does it get set in "Single Frame Mode"?

Or, alternatively, is there any other mechanism which would allow to say that the cycle of operation is over, without keeping track of any timing?

Also, please, let me know what determines the length of pulse in Single Pulse Mode. I thought that would be the same registers as for other modes: PRD, EV1, ..., but the results were weird.

Best regards,
Adam

  • 0
    TI__Expert 6680 points
    Hi Adam,

    You can still enable the DPWM period interrupt, but set the corresponding bit in REQMASK to be 0, then poll the bit in INTREQ . But please note, the DPWM is running much faster than CPU, you will not be able to read the bit in INTREQ in time.

    Regarding the single pulse question, you already have another thread asking about single frame, please put this one there and an expert can help you together.

    Regards,
    Bosheng