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Can't get the "DigitalIn_Record.py" to work.



I can't get the Python script DigitalIn_Record.py to work properly.

Environment that I've tried with:

  • Windows 7 & 10
  • Python3
  • SDK 3.9.1 and 3.10.2
  • Digital Discovery and Analog Discovery 1

Just running the script as is, it seems to be working, but the triggering point is not correct. (When running DD I added FDwfDigitalInInputOrderSet to set fDioFirst=True)

IMHO, this line seems not correct:

  if cSamples == 0 and (sts == DwfStateConfig or sts == DwfStatePrefill or sts == DwfStateArmed) :

sts is declared as c_byte() and DwfState... as c_ubyte(), so they will never be equal. Adding .value will fix this:

  if cSamples == 0 and (sts.value == DwfStateConfig.value or sts.value == DwfStatePrefill.value or sts.value == DwfStateArmed.value) :

Now the script will be hanging, as the unit remains in the prefill state.

Changing -1 to 0 in dwf.FDwfDigitalInTriggerPrefillSet(hdwf, c_int(-1)), makes the unit to leave the prefill state, but the record is not started at the assumed trigger point.

I'm not aware of the units internal design, but a level triggering can cause faulty triggering, so I changed to edge trigger, but it seems like I'm not able to have that work that way either.

Some good ideas what I'm doing wrong? I would like to start a record from my triggering point.

And what does prefill = -1 does? I can't find any info in the SDK manual.



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