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Today's Topics:
1. Xilinx Zynq-based embedded USRP (Sean Nowlan)
2. Re: UHD TX Streamer Metadata (Josh Blum)
3. Maximum real sample rate for N210 (Louis Brown)
4. Tapping the baseband signal. (Usrp IITM)
5. How to stop USRP2 to work with a uhd function ... (Peter Ivanov)
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Message: 1
Date: Mon, 11 Mar 2013 16:45:58 -0400
From: Sean Nowlan <[email protected]>
To: <[email protected]>
Subject: [USRP-users] Xilinx Zynq-based embedded USRP
Message-ID: <[email protected]>
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
At GRcon12 Ettus announced they might be developing a Xilinx Zynq-based
embedded USRP. Is there anywhere I can follow news about this? Such a
device would be *REALLY* cool!
--sean
------------------------------
Message: 2
Date: Mon, 11 Mar 2013 16:38:23 -0500
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] UHD TX Streamer Metadata
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 03/11/2013 07:15 AM, Tim Schuschies wrote:
> Hi All,
> I'm trying to extend the metadata of UHD's tx_streamer. I want to transmit
> some further data to my N210 and I thought that the metadata would be a
> possibility. But now I'm lost in following their path. I don't find the
> point where a tx packet is sent by the uhd driver to the USRP. I think it
> is somewhere in the "send_one_packet" function or in the
You should know, the packet is sent ASAP unless there is backpressure.
Backpressure happens when tx fifos on the USRP are already filled with
samples.
Also the send() call has a timeout and returns number of samples sent so
you can know if it was sent or not.
> "converter_thread_task". I've also seen that the metadata are copied to
> another structure called "if_packet_info". In this structure there is a
> variable which represents the maximum number of 32bit words this structure
> contains. So I have some questions:
> 1) Is it possible to change this value without damaging the driver?
Yes. Its should be flexible about that.
> 2) Is it possible to transmit more metadata to the USRP at all?
Every packet that goes out has metadata. This is encoded in the VITA49
IF data packet standard. Actually, you might find you can abuse one of
the unused field in VITA49 header for your needs.
There is an unused 32 bit seconds count, and an unused 64 bit class id
field.
> 3) And where can I find the handling of that metadata in the ZPU firmware
> of my N210?
Its not in FW, its all fast path FPGA handing. See fpga/usrp2/vita/* for
the vita handler code
> 4) Where is a TX packet sent to the USRP within the UHD drivers?
>
In that send packet handler code, there is a call to
buff->commit(num_bytes), and then buff.reset(), at that moment the host
is sending a UDP packet.
-josh
> Thanks
> Tim
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
Message: 3
Date: Mon, 11 Mar 2013 21:54:40 -0500
From: Louis Brown <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Maximum real sample rate for N210
Message-ID: <[email protected]>
Content-Type: text/plain; CHARSET=US-ASCII
I have an N210 and LFRX. I'd like to capture almost the entire HF spectrum
from DC to 25 MHz. Is there a way to pass only the real samples (RXA) at 50
Msps with 16 bit precision, or would that require custom firmware?
Assuming I can't do that and I'm stuck with complex format, should I be using
sub-device A:A to set the imaginary to zero, rather than stripping off only the
real samples in GNU Radio?
------------------------------
Message: 4
Date: Tue, 12 Mar 2013 09:55:34 +0530
From: Usrp IITM <[email protected]>
To: [email protected]
Subject: [USRP-users] Tapping the baseband signal.
Message-ID:
<CAPkh=_-c5mx9hb++ntvrl3jej+cffbjax89pv3eob7dxg3b...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi
Is it possible to tap the baseband signal (and view it on an
oscilloscope) from the board.I use an SBX daughterboard and USRP N210.
Thanks
Tm
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Message: 5
Date: Tue, 12 Mar 2013 14:46:14 +0200 (EET)
From: Peter Ivanov <[email protected]>
To: [email protected]
Subject: [USRP-users] How to stop USRP2 to work with a uhd function
...
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
Hi,
Does anyone know which command I have to pass to my usrp device to stop
receiving samples through the Ethernet interface?
Thanks in advance!
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