The UHD "rx_samples_to_file" example will do this for you.
--n
On Thu, Mar 1, 2012 at 3:22 AM, Rickard Radio <address@hidden
<mailto:address@hidden>> wrote:
Hi list,
Two questions:
a) I would like to know the easiest way (of low complexity) to
capture a certain length/number of samples (or time period),
preferably in gnuradio, and then automagically turn off the
uhd-reception (and save received samples to disk) ?!
b) Are there any other (kernel, uhd, gnuradio) buffers and
settings than "net.core.wmem_max" and "net.core.rmem_max" (set
with "sysctl" command in Linux) which affect transmit and receive
buffering for uhd/gnuradio ?
Background: I am capturing bursts of samples at very high sampling
rate (like 25 MSPS @ 16 bit I&Q, or 50 MSPS @ 8 bit I&Q) and save
them to disk for further offline processing. But for now I have to
manually cancel the application (CTRL-C) after a few seconds to
avoid overflow since writing to a normal HDD does not keep up for
saving in continuos real time (which anyway quickly creates too
large files). Also, I have tried to maximize receive (and
transmit) buffering (through mentioned buffers) in order to
capture (and buffer) as long sequences as possible in RAM before
saving them to disk and get the inevitable overflows (resulting in
loss of received samples). However, to avoid overflow without
manual interception I would like to capture just as much as the
RAM-buffers can hold (or less) and then automatically turn off the
reception so that the burst of samples can be saved to disk
without any overflows and loss of samples. Feels like it should
be an easy way to accomplish this but how ?! FYI: Hardware is
USRP N210.
Any help appreciated!
/ Rickard
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