buffered acquisition

[zinedine]

I need to know if my NI 4451 board could acquire data with a
circular buffered acquisition or i have to allocate a single
buffer to save all data. thank you in advance.


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[Reinis Kanders]

That sort of info is best found in spec sheet of the board, most NI boards
can do circular buffering.

"zinedine" <09092578NO09SPAM@spv.ing.uniroma1.it.invalid> wrote in message
news:062ec568.a14bb20d@usw-ex0105-034.remarq.com...
> I need to know if my NI 4451 board could acquire data with a
> circular buffered acquisition or i have to allocate a single
> buffer to save all data. thank you in advance.
>
>
> -----------------------------------------------------------
>
> Got questions? Get answers over the phone at Keen.com.
> Up to 100 minutes free!
> http://www.keen.com
>




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[zinedine]

on the board there's a fifo buffer of 512 samples but when i try
to read data using a buffer the process ended when the number of
samples acquired was the same of the size of the buffer (many
examples of LV about continous acquisition work in this way too).
While writing i can't see on output last samples generated
(maybe exactly last 512 samples). The same progams work on a AT-
MIO 16XE-50



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[Reinis Kanders]

I just checked NI knowledge base and yes, you can use that board in double
buffered and multiple buffered mode. In general FIFO has nothing to do with
double or single buffered acquisition, instead DMA controller and board's
drivers (ni-daq) are responsible for data buffering. FIFO is usually for
fast boards to make sure that DMA is successful. Check out NI's website,
they have some examples for buffering (ones I saw used VC++, but I only
looked for a minute).


"zinedine" <09092578NO09SPAM@spv.ing.uniroma1.it.invalid> wrote in message
news:1455ce94.67d8a2f3@usw-ex0105-034.remarq.com...
> on the board there's a fifo buffer of 512 samples but when i try
> to read data using a buffer the process ended when the number of
> samples acquired was t
he same of the size of the buffer (many
> examples of LV about continous acquisition work in this way too).
> While writing i can't see on output last samples generated
> (maybe exactly last 512 samples). The same progams work on a AT-
> MIO 16XE-50
>
>
>
> -----------------------------------------------------------
>
> Got questions? Get answers over the phone at Keen.com.
> Up to 100 minutes free!
> http://www.keen.com
>




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