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Today's Topics:
1. Disturbance in the force or Glitch in the matrix? (mepard)
2. Using UHD.dll with LoadLibrary and GetProcAddress APIs
(Peter Ivanov)
3. Error running USRP2 (Azza Ben Mosbah)
4. UHD and Borland !!! (Peter Ivanov)
----------------------------------------------------------------------
Message: 1
Date: Wed, 6 Mar 2013 15:44:09 -0600
From: mepard <[email protected]>
To: [email protected]
Subject: [USRP-users] Disturbance in the force or Glitch in the
matrix?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
I'm recording 4 channels of data to disk using two N210s connected with a MIMO
cable. Each has its own ethernet connection to the host. The first has an LFRX
and the 2nd a BasicRX (soon they'll each have an LFRX). The sample rate is
12.5e6 samples/second. Here's the GRC-generated setup:
self.uhd_usrp_source_0 = uhd.usrp_source(
device_addr="addr0=192.168.30.2,addr1=192.168.10.2",
stream_args=uhd.stream_args(
cpu_format="sc16",
channels=range(4),
),
)
self.uhd_usrp_source_0.set_clock_source("internal", 0)
self.uhd_usrp_source_0.set_subdev_spec("A:A A:B", 0)
self.uhd_usrp_source_0.set_clock_source("mimo", 1)
self.uhd_usrp_source_0.set_time_source("mimo", 1)
self.uhd_usrp_source_0.set_subdev_spec("A:A A:B", 1)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(0, 0)
self.uhd_usrp_source_0.set_gain(0, 0)
self.uhd_usrp_source_0.set_center_freq(0, 1)
self.uhd_usrp_source_0.set_gain(0, 1)
self.uhd_usrp_source_0.set_center_freq(0, 2)
self.uhd_usrp_source_0.set_gain(0, 2)
self.uhd_usrp_source_0.set_center_freq(0, 3)
self.uhd_usrp_source_0.set_gain(0, 3)
Also, I've add the following at the beginning of uhd_usrp_source_impl::start()
to shut off automatic DC offset correction:
const std::complex<double> no_offset (0.0, 0.0);
set_dc_offset (no_offset, 0);
There's probably a better way, but I wanted to stick with GRC at the top level
and didn't see anything obvious.
It's been working well, but in one run I noticed a very strange glitch, shown
in increasing detail in the plots below (as you might guess, the blue line from
a 60 Hz power line). The change happens from one sample to the next. At first I
thought it dropped some samples, then I considered a sign swap, but it's more
like a phase swap. One channel appears unaffected; it always stays above zero
in this data. I've seen this in only one run. There was no error reported, nor
any Os or Us or the like.
Any idea what might have caused this? One guy here wondered if it was a hiccup
in the complex front end in the FPGA. If so, it happened in two FPGAs at the
same time. I throw away the imaginary part during data collection so I can't go
back and look.
-Marc
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Message: 2
Date: Thu, 7 Mar 2013 12:47:46 +0200 (EET)
From: Peter Ivanov <[email protected]>
To: [email protected]
Subject: [USRP-users] Using UHD.dll with LoadLibrary and
GetProcAddress APIs
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
Hello,
Does anyone know how to create a usrp device handle, how to
initialize the device and how to start downloading sampling through a Rx
port?
I am wondering which is the order of invoking usrp api function
Thanks in advance!
Peter I.
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Message: 3
Date: Thu, 7 Mar 2013 12:03:55 +0100
From: Azza Ben Mosbah <[email protected]>
To: [email protected]
Subject: [USRP-users] Error running USRP2
Message-ID:
<CAH-1RoGwYBYq0i_dZf7ArD=_dm1kxoit8yxih0niredwr2l...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I am a new user of USRP. And I have a major problem : after installing my
USRP on ubuntu, I can't find it.
When I run :
*$ uhd_usrp_probe*
the result is :
*No devices found for -----> Empty Device Address
*
Even when I ping it :
*$ ping 192.168.10.2*
there is no response from the USRP.
And when I type :
*$ uhd_find_devices
*that returns :
*No UHD Devices Found*
Can anyone help me with this, please ?
Thanks in advance.
Best Regards,
Azza. B.M
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Message: 4
Date: Thu, 7 Mar 2013 15:10:44 +0200 (EET)
From: Peter Ivanov <[email protected]>
To: [email protected]
Subject: [USRP-users] UHD and Borland !!!
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
Hello!
Does anyone know whether it is possible the UHD APIs could be called from
Borland C++ Builder.
Thanks in advance!
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