[Discuss-gnuradio] Kindly clarify this issue in GNUradio

[Christopher Clement J]

Hi,

I am trying to modify "USRP_Spectrum_Sense.py", in way that I can display the 
received signal's spectrum using "fftsink2.fft_sink_c" present in 
"gnuradio.wxgui". I have put top block stuffs in the below class that inherits 
stdgui2.std_top_block instead of inheriting "gr.top_block".


class my_top_block(stdgui2.std_top_block):
        def __init__(self,frame,panel,vbox,argv):
                  .
                  .
                  .
                  .
                  .
                  .
                main_loop(self);       (Here I call main loop with self as an 
instance)

I did not change anything within main_loop(). It goes as usual as below..

def main_loop(tb):

    def bin_freq(i_bin, center_freq):
        #hz_per_bin = tb.usrp_rate / tb.fft_size
        freq = center_freq - (tb.usrp_rate / 2) + (tb.channel_bandwidth * i_bin)
        #print "freq original:",freq
        #freq = nearest_freq(freq, tb.channel_bandwidth)
        #print "freq rounded:",freq
        return freq
                  .
                  .
                  .
                  .
                  .
                  .


and calling of the "__init__()" function of the class my_top_block() is 
happening in the below code.

if __name__ == '__main__':
    t = ThreadClass()
    t.start()
    app = stdgui2.stdapp(my_top_block,"USRP Spectrum Sensing")
    try:
        app.MainLoop()
    except KeyboardInterrupt:
        pass


When I run it, execution gets hanged.

I tried debugging line by line, I guess the execution stops at "parse_msg()" 
function call. What is the issue? Can I inherit "sdtgui2.std_top_block"? and, 
what is the way to display spectrum, while sensing goes on? Could somebody, 
please help me in this regard? 

Also, I see a warning as below

""Warning: this may have issues on some machines+Python version combinations to 
seg fault due to the callback in bin_statitics.\n\n""

In which machine and python version, the above mentioned seg fault will arise? 
My machine runs some time, and does  not run sometime.

Regards
Chris Clement






VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – NIRF 
Ranking consecutively for two years, 2016 and 2017.
VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – NIRF 
Ranking consecutively for two years, 2016 and 2017.
VIT is the first University in India to get 4-STAR rating from QS, the 
international ranking agency.
VIT has been adjudged as the “University of the year 2016” by the corporate 
body FICCI.

________________________________________
From: Christopher Clement J
Sent: Wednesday, October 10, 2018 10:50 AM
To: Prabhat Kumar Rai
Subject: Re: Kindly clarify this issue in GNUradio

Thank you


VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – NIRF 
Ranking consecutively for two years, 2016 and 2017.
VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – NIRF 
Ranking consecutively for two years, 2016 and 2017.
VIT is the first University in India to get 4-STAR rating from QS, the 
international ranking agency.
VIT has been adjudged as the “University of the year 2016” by the corporate 
body FICCI.

________________________________________
From: Prabhat Kumar Rai <address@hidden>
Sent: Wednesday, October 10, 2018 10:42 AM
To: Christopher Clement J
Subject: Re: Kindly clarify this issue in GNUradio

Google the OOT module that might help you.
On Wed, Oct 10, 2018 at 10:36 AM Christopher Clement J
<address@hidden> wrote:
>
>
> Thank You, sure I will do....
>
>
> Another one, while writing Python code for GNU radio applications, how to 
> know which module is within which other module or package? How to find, which 
> class to inherit? and which method to use? I am bit stuck up in that.
>
> Thanks and Regards
> J. Christopher Clement
>
>
>
> VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – NIRF 
> Ranking consecutively for two years, 2016 and 2017.
> VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – NIRF 
> Ranking consecutively for two years, 2016 and 2017.
> VIT is the first University in India to get 4-STAR rating from QS, the 
> international ranking agency.
> VIT has been adjudged as the “University of the year 2016” by the corporate 
> body FICCI.
>
> ________________________________________
> From: Prabhat Kumar Rai <address@hidden>
> Sent: Tuesday, October 9, 2018 3:49 PM
> To: Christopher Clement J
> Subject: Re: Kindly clarify this issue in GNUradio
>
> Sorry I have no idea about Functionprobe and Python module linking.
> Please ask the same in mailing list.
> On Mon, Oct 8, 2018 at 10:09 AM Christopher Clement J
> <address@hidden> wrote:
> >
> > Hi Prabhat,
> >
> > I try to use "Function probe" block and "Python Module" block.
> >
> > My idea is to probe a function in "Python Module" block and sets a ID of a 
> > "Function Probe" block with the function return value of "Python Module" 
> > block. Block details are as follows..
> >
> >
> > Function Probe
> >
> > ID: cos_ampl
> > Block Id: Check_Probe
> > Function Name: Cos_Ampl
> > Poll Rate: 100 Hz
> >
> >
> >
> > Python Module
> > ID: Check_Probe
> >
> >
> > Python Module code conatins
> >
> > def Cos_Ampl():
> >       return 10;
> >
> > I am expecting the flow graph to generate a cosine wave of amplitude 10. 
> > But it is not doing so. Is it possible to link "Function probe" and "Python 
> > Module".
> >
> >
> >
> >
> > Regards
> > Chris Clement
> >
> >
> >
> >
> >
> >
> > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – 
> > NIRF Ranking consecutively for two years, 2016 and 2017.
> > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – NIRF 
> > Ranking consecutively for two years, 2016 and 2017.
> > VIT is the first University in India to get 4-STAR rating from QS, the 
> > international ranking agency.
> > VIT has been adjudged as the “University of the year 2016” by the corporate 
> > body FICCI.
> >
> > ________________________________________
> > From: Prabhat Kumar Rai <address@hidden>
> > Sent: Thursday, October 4, 2018 8:16 PM
> > To: Christopher Clement J
> > Subject: Re: Kindly clarify this issue in GNUradio
> >
> > you're welcome
> > On Thu, Oct 4, 2018 at 8:15 PM Christopher Clement J
> > <address@hidden> wrote:
> > >
> > > Thank you Prabhat,
> > >
> > > I did and found the name. I used name as device address instead of IP 
> > > address. it is working now.
> > >
> > > Thanks again
> > >
> > > Regards
> > > Chris
> > >
> > >
> > >
> > >
> > > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – 
> > > NIRF Ranking consecutively for two years, 2016 and 2017.
> > > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – 
> > > NIRF Ranking consecutively for two years, 2016 and 2017.
> > > VIT is the first University in India to get 4-STAR rating from QS, the 
> > > international ranking agency.
> > > VIT has been adjudged as the “University of the year 2016” by the 
> > > corporate body FICCI.
> > >
> > > ________________________________________
> > > From: Prabhat Kumar Rai <address@hidden>
> > > Sent: Thursday, October 4, 2018 6:05 PM
> > > To: Christopher Clement J
> > > Subject: Re: Kindly clarify this issue in GNUradio
> > >
> > > try running uhd_usrp_probe or uhd_find_devices on your terminal
> > > On Thu, Oct 4, 2018 at 12:24 PM Christopher Clement J
> > > <address@hidden> wrote:
> > > >
> > > > Hi Prabhat,
> > > >
> > > > I am now trying with USRP in GNU radio.
> > > >
> > > > Can you please tell me, What is to be given in the device address 
> > > > filed, if i use USRP?
> > > >
> > > >  Regards
> > > > J. Christopher Clement
> > > >
> > > >
> > > > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India – 
> > > > NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India – 
> > > > NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > VIT is the first University in India to get 4-STAR rating from QS, the 
> > > > international ranking agency.
> > > > VIT has been adjudged as the “University of the year 2016” by the 
> > > > corporate body FICCI.
> > > >
> > > > ________________________________________
> > > > From: Prabhat Kumar Rai <address@hidden>
> > > > Sent: Tuesday, September 4, 2018 12:51 PM
> > > > To: Christopher Clement J
> > > > Subject: Re: Kindly clarify this issue in GNUradio
> > > >
> > > > It's fine if your bladerf is working in gnuradio environment, then no
> > > > need to do uhd_image_downloader. If not, then you have to do as it
> > > > also contain some utility for usb-compatibility of bladerf.
> > > > Again no need to do anything if it is working fine.
> > > > On Tue, Sep 4, 2018 at 12:45 PM Christopher Clement J
> > > > <address@hidden> wrote:
> > > > >
> > > > > What is that? I did Pybombs -p prefix/gnuradio_osmosdr/ install 
> > > > > gr-osmosdr.
> > > > >
> > > > > and that is successful.
> > > > >
> > > > > UHD is only for USRP right?
> > > > >
> > > > > Do I need to initialize uhd_image_downloader file also?
> > > > >
> > > > > Bit more of what it is, please?
> > > > >
> > > > > Regards
> > > > > Chris Clement
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of India 
> > > > > – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of India 
> > > > > – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > VIT is the first University in India to get 4-STAR rating from QS, 
> > > > > the international ranking agency.
> > > > > VIT has been adjudged as the “University of the year 2016” by the 
> > > > > corporate body FICCI.
> > > > >
> > > > > ________________________________________
> > > > > From: Prabhat Kumar Rai <address@hidden>
> > > > > Sent: Tuesday, September 4, 2018 12:39 PM
> > > > > To: Christopher Clement J
> > > > > Subject: Re: Kindly clarify this issue in GNUradio
> > > > >
> > > > > Yeah it will be same for BladeRF too. But before doing that make sure
> > > > > you initialize uhd_image_downloader file.
> > > > > On Tue, Sep 4, 2018 at 12:34 PM Christopher Clement J
> > > > > <address@hidden> wrote:
> > > > > >
> > > > > > Thank you for the suggestion..
> > > > > >
> > > > > > I am using BladeRF, not USRP and not simulation. I will go through 
> > > > > > the suggested file and revert back to you.
> > > > > >
> > > > > > Thanks and regards
> > > > > > Chris Clement
> > > > > >
> > > > > >
> > > > > > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of 
> > > > > > India – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of 
> > > > > > India – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > > VIT is the first University in India to get 4-STAR rating from QS, 
> > > > > > the international ranking agency.
> > > > > > VIT has been adjudged as the “University of the year 2016” by the 
> > > > > > corporate body FICCI.
> > > > > >
> > > > > > ________________________________________
> > > > > > From: Prabhat Kumar Rai <address@hidden>
> > > > > > Sent: Tuesday, September 4, 2018 12:28 PM
> > > > > > To: Christopher Clement J
> > > > > > Subject: Re: Kindly clarify this issue in GNUradio
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > Have you checked the python file located in (gnuradio/gr-uhd) named
> > > > > > usrp_spectrum_sense.py . There is something scheduling thing in that
> > > > > > file, you first check it out.
> > > > > > Also are you planning to use sdr device like usrp or just for
> > > > > > simulation purpose.
> > > > > > I think for device purpose, it will be difficult for scheduling the
> > > > > > device for different freq. It might be possible when the scheduling
> > > > > > time will be far more than the (sampling_rate + delay cause by the
> > > > > > device) , alteast 4-5 times. So, 2 second will be sufficient for 
> > > > > > usrp
> > > > > > b2x0, n2xx.
> > > > > >
> > > > > > This is my personal opinion, as I have never worked on scheduling.
> > > > > > On Tue, Sep 4, 2018 at 11:48 AM Christopher Clement J
> > > > > > <address@hidden> wrote:
> > > > > > >
> > > > > > > Hi prabhat,
> > > > > > >
> > > > > > >
> > > > > > > Thank you for the suggestion in UHD issue. That problem is solved.
> > > > > > >
> > > > > > >
> > > > > > > I have another issue as well.
> > > > > > >
> > > > > > >
> > > > > > > I would like to increment a tuning frequency from 450 MHz to 900 
> > > > > > > MHz, with a step size of 6 MHz. This requires a kind of for 
> > > > > > > looping, I guess. But, I see no blocks to implement this in GRC. 
> > > > > > > How can I do this? Will python module block help?
> > > > > > >
> > > > > > >
> > > > > > > Also, i need to implement a scheduling, means for every 2 
> > > > > > > Seconds, one flow graph needs to be processed. Then, I need to 
> > > > > > > choose one direction, if decision is true, and other direction, 
> > > > > > > if the decision is false. How can I implement this scheduling (a 
> > > > > > > kind of timer oriented thing)? and IF looping? Could you please 
> > > > > > > share your views?
> > > > > > >
> > > > > > >
> > > > > > > Thanks and Regards,
> > > > > > >
> > > > > > >
> > > > > > > J. Christopher Clement,
> > > > > > >
> > > > > > > Associate Professor,
> > > > > > >
> > > > > > > SENSE,
> > > > > > >
> > > > > > > VIT
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > VIT – Ranked No.13 in Engineering Institution by MHRD, Govt. of 
> > > > > > > India – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > > > VIT – Ranked No.17 in Management Institution by MHRD, Govt. of 
> > > > > > > India – NIRF Ranking consecutively for two years, 2016 and 2017.
> > > > > > > VIT is the first University in India to get 4-STAR rating from 
> > > > > > > QS, the international ranking agency.
> > > > > > > VIT has been adjudged as the “University of the year 2016” by the 
> > > > > > > corporate body FICCI.
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Regards,
> > > > > > Prabhat Kumar Rai
> > > > > > M.Tech - Communication & Signal Processing
> > > > > > IIT Hyderabad
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Regards,
> > > > > Prabhat Kumar Rai
> > > > > M.Tech - Communication & Signal Processing
> > > > > IIT Hyderabad
> > > >
> > > >
> > > >
> > > > --
> > > > Regards,
> > > > Prabhat Kumar Rai
> > > > M.Tech - Communication & Signal Processing
> > > > IIT Hyderabad
> > >
> > >
> > >
> > > --
> > > Regards,
> > > Prabhat Kumar Rai
> > > M.Tech - Communication & Signal Processing
> > > IIT Hyderabad
> >
> >
> >
> > --
> > Regards,
> > Prabhat Kumar Rai
> > M.Tech - Communication & Signal Processing
> > IIT Hyderabad
>
>
>
> --
> Regards,
> Prabhat Kumar Rai
> M.Tech - Communication & Signal Processing
> IIT Hyderabad



--
Regards,
Prabhat Kumar Rai
M.Tech - Communication & Signal Processing
IIT Hyderabad