GRC USRP source/sink block - IP address

GNU Radio
1

Hello all

just looking for some help regarding the USRP N210 in GRC.

I’m having a problem with the IP address in GRC.

I have looked around but the only material I have found regarding IP
address
relates to setting up the N210 on the network.

That part I have correct.
→ I can ping the device
→ uhd_find_devices returns as it should
→ utilitiy programs (txrx_loopback) work

My problem I think is in integration with GRC.

I have an existing flow that implements my OFDM system (loopback to same
device) that I was using with my USRP1.

All I have done after swapping in the N210 into the loop is populate the
fields in the USRP sink/source block with the N210’s address.

I get the following error complaining about the IP address:

/////////////////////////////////////////////////////////////////////////

Traceback (most recent call last):
File “transmitter_gain_freq_test.py”, line 226, in
tb = transmitter_gain_freq_test()
File “transmitter_gain_freq_test.py”, line 111, in init
channels=range(1),
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/init.py”,
line 116, in constructor_interceptor
return old_constructor(*args)
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py”,
line 2479, in usrp_source
return _uhd_swig.usrp_source(*args)
RuntimeError: unknown key format: 192.168.10.2

/////////////////////////////////////////////////////////////////////////

The generated code is as follows:

            self.uhd_usrp_source_0 = uhd.usrp_source(
  device_addr="192.168.10.2",
  stream_args=uhd.stream_args(
    cpu_format="fc32",
    channels=range(1),
  ),
)
self.uhd_usrp_source_0.set_time_now(uhd.time_spec(time.time()),

uhd.ALL_MBOARDS)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(carrier, 0)
self.uhd_usrp_source_0.set_gain(RX_gain, 0)
self.uhd_usrp_source_0.set_antenna(“RX”, 0)

With the remaining fields blank or default (works with USRP1)

System:
ubuntu 12.10
GNU radio 3.6.5.1

I’m rather stumped here, any suggestions of change would be much
appreciated.
port number perhaps?

Alex B

–
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2

On Fri, Oct 18, 2013 at 06:06:16AM -0700, Alexander B wrote:

That part I have correct.
-> I can ping the device
-> uhd_find_devices returns as it should
-> utilitiy programs (txrx_loopback) work

My problem I think is in integration with GRC.

You need to specify addr=“IP”, not just the IP (otherwise, UHD doesn’t
know you want to use ethernet).

The generated code is as follows:

            self.uhd_usrp_source_0 = uhd.usrp_source(
  device_addr="192.168.10.2",

       That's wrong             ^^^^^^^^^^^^^

MB

–
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin B.
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT – University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

3

Thanks for the reply Martin

yeah I got it now. I had actually tried that but I put:

addr=“192.168.10.2”

in the address field where it should be:

addr=192.168.10.2

Thanks again

Alex B

–
View this message in context:
http://gnuradio.4.n7.nabble.com/GRC-USRP-source-sink-block-IP-address-tp44233p44236.html
Sent from the GnuRadio mailing list archive at Nabble.com.