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Re: [Discuss-gnuradio] B210 two-channel operation

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] B210 two-channel operation
Date: Tue, 27 Jan 2015 14:33:16 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

On 01/27/2015 02:29 PM, Daniel Marlow wrote:

   OS: Ubuntu 14.01.1 
   gnu-radio:  3.7.6
   Dell Optiplex 765    

   I am having trouble using the B210 USRP in two channel mode.    Things work well when I use grc to configure the B210 with one channel, but when I try using two channels, I get the error shown below.     This is quite similar to a problem I had earlier with a TVRX2, which was fixed with a "-M build."    I am still using the same build and the TVRX2 continues to work fine.    Perhaps I am not configuring the B210 properly?    I attach the .grc and top_block.py files.

   Any suggestions would be most welcome.

Dan Marlow

Executing: "/home/marlow/gnuradio/B210/top_block.py"

linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.008.000-50-gb228b755

Using Volk machine: ssse3_64_orc
libGL error: failed to load driver: swrast
-- Operating over USB 2.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 32.000000 MHz... 
-- Actually got clock rate 32.000000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Setting master clock rate selection to 'automatic'.
Traceback (most recent call last):
  File "/home/marlow/gnuradio/B210/top_block.py", line 178, in <module>
    tb = top_block()
  File "/home/marlow/gnuradio/B210/top_block.py", line 99, in __init__
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line 2774, in set_samp_rate
    return _uhd_swig.usrp_source_sptr_set_samp_rate(self, *args, **kwargs)
RuntimeError: LookupError: IndexError: multi_usrp: RX channel 1 out of range for configured RX frontends

>>> Done

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Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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