FDwfAnalogOutNodePlayInfo not documented in WaveForms™ SDK Reference Manual

[Meindert Norg]

Hi,

I received an example file from Glitch in playback at 1 MHz - Test and Measurement - Digilent Forum with a "FDwfAnalogOutNodePlayInfo" function call. However, this function is not documented in the WaveForms™ SDK Reference Manual (Revised March 8, 2024). Do you have an updated manual available?

Thank you. Meindert.

[attila]

Hi @Meindert Norg

It is in the latest version.
Returns max 32Mi but if only one AWG channel is used for play it can go up to 64Mi, similar to Scope buffers 4x32Mi or 2x64Mi or 128Mi for 1 channel capture, and unlimited with streaming at lower rate.

[Meindert Norg]

Hi Attilla, 
I'm trying to use funcCustomPattern to indefinitely play back a (previously recorded) noise signal (5 sec at 6 MHz), but I'm doing something wrong in my python script. I attached my code which (if I remember correctly) started with AnalogOut_Custom.py.

Do you happen to have a good example of how to do this? 

I'm also trying to understand what the difference is between these 4 AnalogOut functions:

• funcCustomPattern - 28 - Generate waveform from custom repeated data with fixed sample rate.
• funcPlayPattern - 29 - Generate waveform from custom data in stream play style with fixed sample rate.
• funcCustom - 30 - Generate waveform from custom repeated data.
• funcPlay - 31 - Generate waveform from custom data in stream play style.

When I google this, I learn that:

• 'Play' means "pre-defined or standard waveform patterns, such as sine waves, square waves, triangle waves, sawtooth waves, and others." and that 
• 'Custom' means "This function allows you to define your own custom waveform pattern by specifying individual data points or samples."

However, in the example you provided me in  https://forum.digilent.com/topic/29985-glitch-in-playback-at-1-mhz/#comment-91414 you are actually generating the sine data in .py and then using the funcPlay to output it on ch1, which is identical to funcCustom in the description above. 

Moreover, when using funcPlay, what is the difference between setting the FDwfAnalogOutRepeatSet to repeat 0x (indefinitely) and using funcPlauPattern?

Thank you.  

Meindert

[attila]

Hi @Meindert Norg

Use Custom if the 32/64ki device buffer size is sufficient and Play is for longer waveforms.
Use *Pattern if you want fixed sample rate, integer divisions of system frequency. The other modes may use fractional increment so the average rate will be closer to the requested value.

 

[Meindert Norg]

Hi Atilla, 

Thank you. 

About the 32/64ki device buffer size: do you mean 32/64MSamples buffer size? Or am I thinking of the wrong buffer

Meindert

[attila]

Hi @Meindert Norg

The device provides flexible BRAM for standard and 'custom' waveforms, for thousand of samples.
The DDR RAM buffering is used for 'play' function, for millions of samples.
See previous post for more details: