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?
>>
>>
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