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Today's Topics:
1. TDOA time stamp in GNU Radio (Joel Brinton)
2. [RX_SAMPLES_TO_FILE] NaN Error (Rog?rio Rivera)
3. Re: [RX_SAMPLES_TO_FILE] NaN Error (Marcus Leech)
4. Re: TDOA time stamp in GNU Radio (Josh Blum)
5. Adding devices without forking UHD (Michael McTernan)
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Message: 1
Date: Mon, 27 May 2013 11:16:51 -0700
From: Joel Brinton <[email protected]>
To: [email protected]
Subject: [USRP-users] TDOA time stamp in GNU Radio
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello,
I've searched and searched but can't find any examples to receiving a
timestamp stream from the GRC USRP block. I have a PPS input into our
B100 array. Has anyone used this?
thank you kindly,
Joel
------------------------------
Message: 2
Date: Mon, 27 May 2013 18:36:47 -0300
From: Rog?rio Rivera <[email protected]>
To: [email protected]
Subject: [USRP-users] [RX_SAMPLES_TO_FILE] NaN Error
Message-ID:
<cap9hz16mnav_dckrgqdckr+jjetf4rkkn5sccyextdonqqk...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I am using USRP N210 WBX.
I'm having trouble when receiving samples from "rx_samples_to_file".
Some lines are corrupted and I haven't managed to correct this problem yet.
I've been changing the --rate parameters and --gain, unsuccessfully.
Here's my command line
./rx_samples_to_file --file novaamostra3.dat --rate 1000000 --freq
192000000 --gain 0 --nsamps 100
How do I fix these "NaN problem" lines?
I can't manipulate this file "novaamostra3.dat" using Octave due to these
"NaN" errors.
I really appreciate any help!!
Thanks,
Rog?rio Rivera
University of Brasilia
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Message: 3
Date: Mon, 27 May 2013 21:49:22 +0000 (UTC)
From: Marcus Leech <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] [RX_SAMPLES_TO_FILE] NaN Error
Message-ID: <362417893.101889.1369691362958.JavaMail.mail@webmail06>
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Message: 4
Date: Mon, 27 May 2013 19:50:50 -0500
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] TDOA time stamp in GNU Radio
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/27/2013 01:16 PM, Joel Brinton wrote:
> Hello,
>
> I've searched and searched but can't find any examples to receiving a
> timestamp stream from the GRC USRP block. I have a PPS input into our
> B100 array. Has anyone used this?
>
This is a c++ block that reads the time from the stream and prints it:
http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/examples/c++/tag_sink_demo.h
-josh
> thank you kindly,
> Joel
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
Message: 5
Date: Tue, 28 May 2013 11:27:32 +0100
From: Michael McTernan <[email protected]>
To: [email protected]
Subject: [USRP-users] Adding devices without forking UHD
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi All!
I was playing with the UHD library and a hardware board I modified here
and wondered if I could get them to work together...
I noticed that the UHD library is well structured with a 'factory' class
producer and search methods for devices, but I can't see a documented
way to add into this infrastructure without rebuilding the whole lib.
It looks like one way to add devices is to make a fork of the code and
work on it directly, as Fairwaves have already had to for their
UmTRX[1]. This doesn't seem ideal, especially given that UHD is already
packaged in Linux distros.
The next (untried) method on Linux could be to use LD_PRELOAD tricks
with UHD_STATIC_BLOCK to register additional device implementations via
device::register_device()? I'm not sure if this is the intention, and
perhaps it isn't all that safe unless symbol versioning is added[2], and
it probably won't work on Windows.
Or is it the case that the interface of uhd::usrp::multi_usrp and
associated classes are not yet considered stable, so this is not yet be
worthwhile?
Is there a mandated way to add other devices to UHD?
Kind Regards,
Mike
[1] https://github.com/fairwaves/UHD-Fairwaves
[2] http://gcc.gnu.org/wiki/SymbolVersioning
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