DD: Use Play Mode to generate periodic pattern

[Stefan-F]

Hi,

I want to output a complex but periodic pattern (like the PWM signal of a sine wave), with more than 64k samples / period.

I want to define the data points for a period and output this pattern endlessly.

I tried to use playback mode, like in DigitalDiscovery_PlayRecord.py, which works fine for a single period.

But I have not found a way to repeat the pattern.

I tried setting FDwfDigitalOutRepeatSet() to a value other than one, but the data point address doesn't seem to start over at 0 for each new period, but keeps increasing and outputting random memory contents after the first period.

Is there an other way to solve this problem?

Or is it possible to make FDwfDigitalOutRepeatSet() work for values other than one? 

 

Best regards,

Stefan

 

 

[attila]

Hi @Stefan-F

For "infinite play" fill the entire 256Mi Byte of device memory.
See the following example: DigitalDiscovery_Play.py

[Stefan-F]

Thank you @attila, 

your solution does the trick. All that needs to be done is to adjust the length of the pulse patterns so that an integer number fits into the entire memory.

 

Best regards,

Stefan