[Discuss-gnuradio] Data transfer between gnuradio flowgraph and Python

[Ivan]

I have a simple gnuradio flowgraph inside a Python script that takes data from 
a usrp source and does some simple processing 
with the fft block. The results are written in a file sink. I start the graph 
using the start() method, let it run for 100 ms, 
then stop it using the stop() and wait() methods. In the Python script that 
contains the flowgraph, there is a piece of code 
that reads data from the file sink and does some processing. I then change the 
usrp tune frequency and couple of other parameters
and repeat the process. 

The problem is that the file keeps growing and I want to discard all previous 
data once I set the new parameters. It doesn't 
matter if I set 'append' to false. The file keeps growing as long as the 
flowgraph exists. I can terminate the flowgraph every
time I want to change the parameters but that's not a convenient option because 
everything has to be reinitialized inside the usrp
including the fpga bitfile.  

Is there a better way to transfer data between the flowgraph and the top level 
Python script? I was going to use something 
like a simple buffer that could be cleared but I couldn't find anything like 
that in the gnuradio library. 

Ivan
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[Discuss-gnuradio] data transfer

[manash das]

when i am trying to transfer data within the laptop , i am able to do it.
but i could not achieve the same using usrp. my machine is detecting usrp
properly. pls help.. also if i can get a flowgraph for data transfer which
includes an routing block i'll be grateful..
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Re: [Discuss-gnuradio] Data transfer through Pre-cog

[John Malsbury]

E-mail me the flow graph you are using -> john.mals...@ettus.com


On Sat, Jul 20, 2013 at 1:04 AM, GNU radio  wrote:

> Hi
> I am trying from the past week to use the pre-cog library for data
> transfer between two USRP N210 devices. I have tried a number of
> configurations by replacing many blocks and modifying the Python code.  I
> managed to transmit just a single packet and then the transmitter stops
> with no error. The spectrum analyzer also shows just a single packet
> transfer.
>
> Can some body guide me on how to use the pre-cog simple trx for data
> transfer.
>
> Regards
>
>
>
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[Discuss-gnuradio] Data transfer through Pre-cog

[GNU radio]

Hi
I am trying from the past week to use the pre-cog library for data
transfer between two USRP N210 devices. I have tried a number of
configurations by replacing many blocks and modifying the Python code.  I
managed to transmit just a single packet and then the transmitter stops
with no error. The spectrum analyzer also shows just a single packet
transfer.

Can some body guide me on how to use the pre-cog simple trx for data
transfer.

Regards
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[Discuss-gnuradio] Data transfer using Sound cards

[ahmed hussein fayez]

Hi All

I am a beginner to the GNU Radio world ...so i apologize ahead if i am taking 
much of your precious time.

I am trying to transfer data between two PCs running Ubuntu9.04 gnuradio 3.2.2 
using a wired channel via sound cards.Looking in the mail list archive i found 
a similar topic but with no replies. 

My target is to implement  an OFDM Transceiver over wired channel using 
gnuradio (ADSL modem).At this time i managed to send signals through the sound 
card using NBFM Transmitter but i can't acquire any Rx signal at the 
destenation PC  Line in.

I need to know how to deal with sound cards to be able to exchange data between 
the source and destination.


Thanks in advance

Ahmed H Fayez
  
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