Marcus:
You say that "the UHD provides a different API than "classic", and
usrp2_fft.py uses the "classic" API." I'm brand new to UHD and just getting
started with it. Could you explain in a little more detail about the two APIs
and the differences between them?
I'm using raw Ethernet now with a USRP2+WBX, so why would, when using GRC to
create a flowgraph, the interface change?
Thanks.
Steve McMahon
--- On Wed, 1/12/11, Marcus D. Leech <mle...@ripnet.com> wrote:
From: Marcus D. Leech <mle...@ripnet.com>
Subject: Re: [Discuss-gnuradio] The (in)famous channel 0 not receiving error
To: discuss-gnuradio@gnu.org
Date: Wednesday, January 12, 2011, 1:15 PM
Hi everyone,
I recently compiled and installed gnuradio.
I then tried to find the usrp2:
#find_usrps
00:50:c2:85::3b:5c hw_rev = 0x0400
Next I tried to plot an FFT of the GPS L1 signal (note that my
daughterboard is a dbsrx2)
#usrp2_fft.py -f 1.57542G
usrp2: channel 0 not receiving
usrp2::rx_samples() fail
Where am I going wrong? I have seen other posts with people facing
the same problem but they are from way back in mid-2010 and with
different daughterboards from mine.
Additional information:
- daughterboard is a dbsrx2
- usrp2 was ordered sometime in October 2010
- I have the uhd driver installed but figured that it can exist
with the "usual" Ethernet driver
- Are there any firmware and/or fpga upgrades I am supposed to
make?
Nick
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When you go to UHD, you have to change the firmware on the USRP2,
which is available here:
http://www.ettus.com/downloads/uhd_images/
Further, the UHD provides a different API than "classic", and
usrp2_fft.py uses the "classic" API.
You can synthesize the functionality of usrp2_fft.py, using an UHD
source, within Gnuradio Companion,
in about five minutes.
With the DBS_RX2, you have no choice but to convert to UHD (or
back-port the DBS_RX2 support into
the "classic" USRP2 interface).
All new hardware from Ettus will only be supported using the UHD
interface, and UHD is now robust enough
that I recommend *all* new users use it.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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