[comedi] pyusbdux V2 now callback based

Hi all,

I've rewritten pyusbdux now with callbacks. So instead of doing polling=20
in python in a loop the python program registers a callback and then=20
receives the samples at the requested sampling rate:

#!/usr/bin/python3

import pyusbdux as dux

class DataCallback(dux.Callback):

 =C2=A0=C2=A0=C2=A0 def hasSample(self,s): # <-- sample arrives here
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 print("s:",s)

cb =3D DataCallback()

# open default USBDUX
dux.open()

# sampling from 8 channels
# at a sampling rate of 250Hz.
dux.start(cb,8,250)

# Just idles till the user presses return.
input()

# Stops the data acquisition.
dux.stop()

https://github.com/berndporr/pyusbdux

https://pypi.org/project/pyusbdux/

Coding-wise it's an interesting twist with an interface between two=20
languages and swig is managing that. I'm using std::array which is now=20
fully supported so that the number of elements in an array are no longer=20
a problem.

Best,

/Bernd

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