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Re: [Discuss-gnuradio] Measuring SNR

From: Swapna Raj
Subject: Re: [Discuss-gnuradio] Measuring SNR
Date: Thu, 12 Feb 2009 22:35:00 -0600

I am sorry if my previous mail was confusing. I am trying to switch toa different Rx  freq depending on a control information. Even though I exit from rx_callback and try to call a new script for Rx using os.system I get an error message saying
USB _claim_interface :failed interface 2
Device or resource busy
can't open rx_interface
can't open usrp1.

I closed /disconnected the flowgraph before attempting to open a new script. How can I ensure that the rx_path is clear?

Thank you

On Thu, Feb 12, 2009 at 9:19 PM, Swapna Raj <address@hidden> wrote:

Thank You.
os.system() worked. I can now switch between different scripts while in transmitting mode.

To all,
While receiving data (using a modification of benchmark_rx.py) I need to receive at a different frequency depending on some control information .

I get an error message while attempting to do this using os.system().It says

cannot connect to usb interface, cannot connect to usrp1
I tried the following and it doesn't work

1.I tried using flowgraph.disconnect and flowgraph.close() before calling the second script.
2.I tried calling os.system() after exiting rx_callback and main() but it still can't connect to the source.
3.I also tried changing frequency instead of calling a separate script inside rx_callback()

How can I ensure that the receive path is completely disconnected and usrp_source is available?

thanks ,

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