all samples n transferred from the buffer

Hi all

I have a question for every N samples transferred DAQmx event buffer. By looking at the description and the very limited DevZones and KBs on this one, I am inclined to believe that the name is perfectly descriptive of what must be his behavior (i.e. all samples N transferred from the PC buffer in the DAQmx FIFO, it should report an event). However, when I put it into practice in an example, either I have something misconfigured (wouldn't be the first time) or I have a basic misunderstanding of the event itself or how DAQmx puts in buffer work with regeneration (certainly wouldn't be the first time).

In my example, I went out 10 samples from k to 1 k rate - so 10 seconds of data. I recorded for every N samples transferred from the event of the buffer with a 2000 sampleInterval. I changed my status of application of transfer of data within the embedded memory in full with the hope that it will permanently fill my buffer with samples regenerated (from this link ). My hope would be that after 2000 samples had been taken out by the device (e.g., take the 2 seconds) 2000 fewer items in the DMA FIFO, it would have yielded 2000 samples of the PC for the FIFO DMA buffer and so the event fires. In practice it is... not to do so. I have a counter on the event that shows it fires once 752 almost immediately, then lights up regularly after that in spurts of 4 or 5. I am at a loss.

Could someone please shed some light on this for me - both on my misunderstanding of what I'm supposed to be to see if this is the case and also explain why I see what I see now?

LV 2013 (32 bit)
9.8.0f3 DAQmx
Network of the cDAQ chassis: 9184
cDAQ module: 9264

Thank you

There is a large (unspecced, but the order of several MB) buffer on the 9184.  He came several times on the forum, here a link to an another discussion about this.  Quote me:

Unfortunately, I don't know the size of this buffer on the 9184 on the top of my head and I don't think it's in the specifications (the buffer is also shared between multiple tasks).  This is not the same as the sample of 127 by buffer slot AO which is present on all chassis cDAQ - controller chassis ethernet / wireless contains an additional buffer which is not really appropriate I can say in published specifications (apparently it's 12 MB on the cDAQ wireless chassis).

The large number of events that are triggered when you start the task is the buffer is filled at startup (if the on-board buffer is almost full, the driver will send more data — you end up with several periods of your waveform output in the built-in buffer memory).  So in your case, 752 events * 2000 samples/event * 2 bytes per sample = ~ 3 MB of buffer memory allocated to your task AO.  I guess that sounds reasonable (again would really a spec or KB of...) I don't know how the size of the buffer is selected).

The grouping of events is due to data sent in packages to improve efficiency because there is above with each transfer.

The large buffer and the consolidation of the data are used optimizations by NOR to improve flow continuously, but can have some strange side effects as you saw.  I might have a few suggestions if you describe what it is you need to do.

Best regards

Tags: NI Hardware

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