What determines the max buffer size for acquisition for the Analog Discovery 3?

[eradarhughes]

I used the following code to determine the maximum buffer size for acquisition:

nBufMax = c_int()
dwf.FDwfAnalogInBufferSizeInfo(hdwf, 0, byref(nBufMax))
print("nBufMax = ", nBufMax)

For my AD3, I am getting an answer of c_int(16,384).   For what reason am I getting this instead of 32768?    I have DWF Version: b'3.22.2'.  My acquisition mode is acqmodeSingle.   I would like to capture more samples, but if I set my acquisition buffer to anything larger than 16,384, I get zeroes in all samples above that number.   Any insight to this would be greatly appreciated.

Thanks.

 

Edited July 24 by eradarhughes
fix typo

[attila]

Hi @eradarhughes

Use the second device configuration for 2x 32768 oscilloscope sample device buffer.
If one channel is enabled will let you capture up to 65536 samples.
For more samples at lower rate (<=10MS/s) use streaming mode, see AnalogIn_Record.py .... AnalogOutIn_PlayRecord.py examples

[eradarhughes]

26 minutes ago, attila said:

Hi @eradarhughes

Use the second device configuration for 2x 32768 oscilloscope sample device buffer.
If one channel is enabled will let you capture up to 65536 samples.
For more samples at lower rate (<=10MS/s) use streaming mode, see AnalogIn_Record.py .... AnalogOutIn_PlayRecord.py examples

That worked!   I had to use dwf.FDwfDeviceConfigOpen(c_int(-1),c_int(1), byref(hdwf)) because of the zero indexing of Python.  Thanks!