How many DMA Channels does my device have?
I would like to know how I can find out (progammatically) how many DMA channels my device has. I am using the DAQmx driver. Other than with the traditional DAQ I can't find out anything about my device but the "type" and the "serial number". Where can I get some more details about the device (not in the MAX - I want to know it in my program) with DAQmx?
My intention is to find out how many DMA Channels the device has and depending on how many Channels I need - I am using "interrupts" instead of DMA.
Somewhere in the KB of Ni was written that the NI-DAQ 6.9.... realizes automatically how many DMA Channels are available and how many I would need - and so he takes "interrupts" for the rest.
It seems that they did a "step bac
kwards" because with the NI-DAQ 7.2 it doesn't work automatically if I need DAQmx VI's.
Does somebody know anything that would help me to solve this problem?
Thanks.
Sorry! I posted my first revision of the answer.
Here is what I meant to say:
Hello,
According to this KnowledgeBase, DAQmx and Traditional DAQ behave the same. Are you seeing something different?
As far as a workaround goes, all you have to do is trap the No DMA error. This error should be -200251. So in software, if you receive error -200251, then you need to configure the board to use interrupts, and then start the task again.
How to configure the board for interrupts differs from the four different DAQmx API�s (C, C++, DotNET, and LabVIEW). If you are unclear about how to do this in your environment, please let us know, and we can find
out.
Best regards,
Justin T.
National Instruments
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