Hi Nathan, That's not quite what I want. I do not want the file to have a certain number of FFTs. I want to have a counter which is dynamically updated as the FFTs are written to a file. Ideally I want to know when a new FFT is written to the file so I can trigger another function to process it. I need this to be done real time and that's why I'm looking for the most efficient way.
Regards, Hasini On Tue, Sep 20, 2016 at 10:34 AM, West, Nathan <n...@ostatemail.okstate.edu> wrote: > > On Mon, Sep 19, 2016 at 6:57 AM, Hasini Abeywickrama <hva...@gmail.com> > wrote: > >> Hi Marcus, >> >> That's what I'm currently doing. It's not very efficient as I have to >> constantly check the file size. If I can have a counter that is increments >> each time an FFT is written to the file by the flow graph I would be able >> to trigger an event based on the counter value. That was my concern. >> >> Regards, >> Hasini >> >> On Sep 19, 2016, at 3:29 PM, Marcus Müller <marcus.muel...@ettus.com> >> wrote: >> >> If you need to do that externally, I'd just watch the file size and >> divide it by the item size (4B per floating point number) and by the FFT >> length. >> >> >> Best regards, >> >> Marcus >> >> On 09/18/2016 11:21 PM, Hasini Abeywickrama wrote: >> >> Hi Marcus, >> >> It's like I need to start reading and processing the file after a certain >> number of FFTs are being written to the file. For that I would need to >> maintain a counter and I'm trying to figure out how to do it. >> >> Regards, >> Hasini >> >> > You can do this with the head block. It let's N number of items through > and then stops the flowgraph. Set N to your certain number and then the > file will have N FFTs. > > > >> >> On Mon, Sep 19, 2016 at 2:58 PM, Marcus Müller <marcus.muel...@ettus.com> >> wrote: >> >>> What would you need that counter for? There's the 1/(FFT length) fixed >>> relation between samples processed and numbers of FFTs done, so this is >>> pretty much a redundant piece of info, but maybe I'm just missing the use >>> case. >>> >>> Best regards, >>> >>> Marcus >>> >>> On 09/18/2016 10:23 PM, Hasini Abeywickrama wrote: >>> >>> Hi all, >>> >>> I have a GNU Radio flowgraph which uses a USRP to receive a signal, >>> converts it to log power FFT and then writes the result to a file, using >>> File Sink. I want to have a counter which increments with each FFT written >>> to the file. >>> >>> Is there a way of maintaining and increasing count of the FFTs written >>> to the file, while the flowgraph is still running? >>> >>> >>> _______________________________________________ >>> 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 >> >> >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
