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Single Time Graph behaviour using EDMA3 double buffer acquisition - ccsv61.1

Gaston Schelotto
Expert 2870 points

Other Parts Discussed in Thread: ADS1278

Hi all,

I've implemented a double buffer ADC acquisition using ADS1278+C6747 and XDS510 for debugging. If I display a Single Time Graph in the Tools options(continuous refresh enabled) I see the next figure

So far so good.. The above graph shows a 10240 samples (10 entire cycles) of 50Hz sine waveform

However If I change the frequency of the input waveform (i.e to 51Hz) I get the next waveform

Changing the input frequency to 55Hz (a multiple of 5) results a correct graph again (11 entire cycles).

I'm pretty sure there is no issue regarding to acquisition stage. I think it happens due to the debug synchronization among EDMA3 buffers and CCS graphs. Could anyone confirm this behavior and how avoid it?

regards,
gaston