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Re: [Discuss-gnuradio] Post Binary Slicer question


From: Martin Braun
Subject: Re: [Discuss-gnuradio] Post Binary Slicer question
Date: Wed, 30 Apr 2014 09:20:49 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 29.04.2014 22:43, Jay Radcliffe wrote:
The protocol is unknown at this time.  I need to see the packets to
figure some of this out.

Jay,

does the QT GUI Time Raster sink help you in any way?

M


Ideally, I would like to see the entire packet (including the preamble
and sync word) to start to work my way to the format of the packets from
there.  I am using the power squelch with the gate to limit the captures
to just when a signal is over a certain strength. In a perfect world, I
would like to have "Binary Slicer" -> "File Sink" where the file
contents are the binary stream (10101010101010 not to be confused for a
binary file) or hex output (0xAA 0xAA).  I could probably tag the
preamble in with the Correlate Access Code?

Jay Radcliffe
Twitter: @jradcliffe02
E-Mail: address@hidden <mailto:address@hidden>
LinkedIn + Resume: http://www.linkedin.com/in/jradcliffe02


On Sun, Apr 27, 2014 at 9:28 PM, John Malsbury <address@hidden
<mailto:address@hidden>> wrote:

    Jay,

    Thanks for the inquiry.  Is there a specific protocol or format you
    are trying to work with?  Are the frame size fixed in length or
    variable?  The answers to these questions will dictate whether you
    can use an existing block or if you will need to write your own.

    Writing a block to parse things after the correlate access code
    block is relatively straight-forward.  If you are using the (tag)
    version of that block, you simply need to look for the presence of
    that tag to delineate the start of a frame.

    -John


    On Sun, Apr 27, 2014 at 4:27 PM, Jay Radcliffe
    <address@hidden <mailto:address@hidden>> wrote:

        I have a question about handling data after binary slicing in
        the demodulation portion of handling a signal. Currently I am
        taking that data and pushing it through the Correlate Access
        Code block then into a file sink. This produces a data file.  I
        didn't know if someone could tell me a block or method that will
        output the binary stream (or hex stream) to a file or stdout for
        real-time view of the pack contents. Currently I have some
        python code that converts that data file into binary/hex which
        is not idea.

        Thanks,

        Jay


        Jay Radcliffe
        Twitter: @jradcliffe02
        E-Mail: address@hidden
        <https://mail.google.com/mail/?view=cm&fs=1&tf=1&address@hidden>
        LinkedIn + Resume: http://www.linkedin.com/in/jradcliffe02

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