Hello everyone,
I
am acquiring data from 4 analog inputs ai0:3 ( voltage ) in a
continuous mode, display the data (charts and graphs) and stream the
data to TDMS files in a consumer loop.
The same time I want to
have the ability to save '' time windows'' of my acquisition. For
example, I wanna be probing ai1:2 and when the voltage exceeds a
certain value , i.e 0.5V, I can trigger with an analog reference and
get a certain amount of samples (finite samples) after the trigger and
before that ( pre- trigger samples). I am aware of how I can achieve
that, a NI example is most helpful : http://sine.ni.com/devzone/cda/epd/p/id/4840 .
The
problem is this : I do not want to stop the continuous acquisition
which is already undergoing. If I try to start a new task ( somehow ''
copy & paste '' the example) I get , as expected, error -50103, "specified resource is reserved".
So,
is there any way of achieving this task without having to bump into
this resources reserving problem? And if there is not a way could you
suggest a way to perform this pre-trigger and trigger sampling?
Please, find attached a snapshot of the code. I am using a PCI-6254 with two SCB-68.
Thank you very much and looking forward for you advice!!
Best regards,
Panos
