The UHD "rx_samples_to_file" example will do this for you. --n
On Thu, Mar 1, 2012 at 3:22 AM, Rickard Radio <[email protected]>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 > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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