Take a look at "Tagged file sink" block.
2017-05-25 4:35 GMT+03:00 Deepak Gautam <dpaak...@gmail.com>: > > On Thu, May 25, 2017 at 10:34 AM Deepak Gautam <dpaak...@gmail.com> wrote: > >> Dear Gilad, paul,luca >> >> >> Thank you for the kind response. Yes, i need the high accuracy and i >> think i should go with "issue_stream_cmd" method. Before i start working in >> this method, my concern is whether i can write the different burst in >> separate file. My main conern is written file size. Because i have to >> record data for few minutes With my sampling rate of 25msps. I got problem >> of overflow when i write in normal hard disk. So i am writing data in RAM >> disk by which i dont get overflow. Due to size limitation of the Ram disk, >> i will not be able to write all data in one file. If i write in different >> file, i can move previous files back to hard disk and proceed. If there is >> a way of writing in a file for 3/4 minutes with 25msps without overflow , i >> dont need burst reception also. I appreciate your opinion >> >> Best regards, >> Deepak >> >> >> >> On Sun, May 21, 2017 at 6:24 PM Paul I. <paulneli...@gmail.com> wrote: >> >>> You need to use USRP "issue_stream_cmd" method (mode: >>> STREAM_MODE_NUM_SAMPS_AND_DONE). It's allow to receive burst of data by >>> USRP timer. >>> If you work in GRC: >>> 1) Disable streaming autostart for "UHD source" >>> 2) Create your own block which will periodically issue stream commands >>> (yes, you need to pass USRP pointer to it) >>> a) For stream command set "num_samples" = sample_rate * 1 sec >>> b) Read the USRP timer value, add some time offset to it and use this >>> value as timestamp for the first stream command >>> c) Increment timestamp after every stream command >>> ... >>> 3) Profit! >>> >>> 2017-05-20 10:09 GMT+03:00 Gilad Beeri (ApolloShield) < >>> gi...@apolloshield.com>: >>> >>>> If you need accuracy, I think the asynchronous nature of your method >>>> might problematic (will appreciate input from GR devs). >>>> Maybe try a different approach - write the samples to a memory buffer, >>>> then read from the buffer the exact # of samples you want to write to a >>>> file. >>>> >>>> On Fri, May 19, 2017 at 5:02 PM Deepak Gautam <dpaak...@gmail.com> >>>> wrote: >>>> >>>>> Dear luca, >>>>> >>>>> I had already tried with controlling flow graph dynamically using >>>>> start(), stop(), lock(), unlock() function. Here i have the part of code i >>>>> had used. >>>>> >>>>> tb=top_block_cls() >>>>> count=1 >>>>> tb.start() >>>>> while (count<5): >>>>> time.sleep(1.0) #data is recorded in the file >>>>> tb.lock() >>>>> tb.disconnect((tb.uhd_usrp_source_0,0),(tb.blocks_file_sink_0, >>>>> 0)) #disconnect source and block >>>>> tb.blocks_file_sink_0= blocks.file_sink(gr.sizeof_gr_complex*1, >>>>> filename,False) # create new file sink to write >>>>> tb.connect((tb.uhd_usrp_source_0,0),(tb.blocks_file_sink_0, 0)) >>>>> #connect source with new file >>>>> count=count+1 >>>>> time.sleep(2.0) #wait >>>>> tb.unlock() >>>>> tb.stop() >>>>> >>>>> >>>>> This program should write the data for 1 second in the file, wait for >>>>> 2 second and again write for 1 second to another file and so on for 5 4 >>>>> times. I expect the total data written in the file to be same. But total >>>>> number of samples recorded in the files are different. for my sampling >>>>> rate >>>>> of 25MSps, it should record 25MS per file, but it is around 22Mega sample >>>>> with different number of data in different file. So it is difficult to >>>>> reproduce the accurate signal from received data . My application requires >>>>> very good phase coherence. So i am wondering whether there is something to >>>>> do to solve in this method or i have to think of another idea. >>>>> >>>>> >>>>> Best Regards, >>>>> Deepak >>>>> >>>>> >>>>> >>>>> On Mon, May 15, 2017 at 9:02 PM Moritz Luca Schmid < >>>>> luca.moritz.sch...@gmail.com> wrote: >>>>> >>>>>> Hey Deepak, >>>>>> >>>>>> my first idea is to reconfigure the flowgraph. You could connect and >>>>>> disconnect your source for the time, you want to write data in your file >>>>>> sink and the time you don't want to. >>>>>> >>>>>> You can find infos about the flowgraphs operations here >>>>>> <https://gnuradio.org/doc/doxygen/page_operating_fg.html>. >>>>>> >>>>>> >>>>>> Best >>>>>> >>>>>> Luca >>>>>> >>>>>> >>>>>> >>>>>> On 15.05.2017 13:53, Deepak Gautam wrote: >>>>>> >>>>>> Currently i am working in the USRP using GNU Radio for my masters >>>>>> work. In my transmitter side, i send data continuously from file source >>>>>> followed by UHD Sink at the rate of 25 MSPS. In receiver side, I want to >>>>>> write the data in every two/three seconds after receiving from receiver >>>>>> USRP. Meaning, write data for 1 sec (25M samples), then dont write for >>>>>> next >>>>>> 2 second and again write for 1 sec and so on. Is there any suggestion for >>>>>> this purpose. I look forward for the resposne >>>>>> >>>>>> >>>>>> Best Regards, >>>>>> Deepak >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Discuss-gnuradio mailing >>>>>> listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> Discuss-gnuradio@gnu.org >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>>
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