C6748 EDMA Interrupt & ISR question about data missing.

sung chul woo

Intellectual 430 points

Hi.

I'm using ADC (McBSP), EDMA interrupt & ISR for data acquisition & signal processing.

It takes 0.5sec for data acquisition & calibration, and 0.5sec for signal processing in ISR.

(McBSP -> EDMA interrupt -> ISR (signal processing) -> McBSP) (infinite loop)

I want to get continuous data for all infinite DSP processing loop,

but there is 0.5sec EDMA data loss between each loop for signal processing.

How can I do data acquisition and signal processing simultaneously?

To be short, is it possible that EDMA transfer and ISR function work in same time?

Thanks.

over 12 years ago

0 Radhesh Bhat over 12 years ago

Genius 4590 points

If I have understood your question correctly, ideally yes. It is possible. Only thing is that you may want to have some kind of ping pong buffering scheme to make sure data flow is smooth.

0 sung chul woo over 12 years ago in reply to Radhesh Bhat

Intellectual 430 points

Thanks for your answer, but I don't know about ping-pong scheme because I'm new about DSP.

Where can I find information about that?

I'm using McBSP (FSX output, CLKX output, DR input) for ADC, and EDMA 2 param link interrupt for ISR.

Thanks.

Woo.

0 Radhesh Bhat over 12 years ago in reply to sung chul woo

Genius 4590 points

Hi Woo,

EDMA userguide should help you out for what you are looking for.

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C6748 EDMA Interrupt & ISR question about data missing.