[Discuss-gnuradio] Ver 3.7 stable?

[Mamoru Yamamoto]

Dear experts,

<I send this question to both GNU radio and USRP mailing lists. I do not
know which is better place for this discussion.>

(1) Introduction
I am Mamoru Yamamoto from Kyoto Univ.
Some may know that I am doing satellite-beacon experiment
by using USRP1 + GNU Radio.  We call the receiver as
GRBR (GNU Radio Beacon Receiver).
http://www.rish.kyoto-u.ac.jp/digitalbeacon/
Sorry this web site is very old.  Now I am using
USRP1 + uhd + GNU Radio from python script
Also I am using Ubuntu 12.04LTS.
My application is a very simple dual-channel receiver
recording IQ time-series on two files.
The system is VERY stable and useful.  I like it very much.

(2) Current situation
Now I try to move to Ver 3.7.
(I installed the software by "build-gnuradio script".)
Necessary small changes for me were
-- "optfir.low_pass" location change
-- "freq_xlating_fir_filter_ccf" location change & centerfrequency
setting from negative to positive
-- "file_sink" location change

(3) Questions
These changes were done.  I now start running the system,
but have problems.  I have 2 questions.

Q1: I run the modified code with Ubuntu-32bit 12.04LTS.  My code worked
for several times, but after that, it created only "0-byte" files
(=immediate stop), and then no files were created.  I checked the uhd
status, and found that "uhd_find_devices" was successful while
"uhd_usrp_probe" failed (see below).  I now connect USRP1 to USB3 port.
 Is this wrong?

Q2: I also tried to use the same V3.7 code with Ubuntu-64bit 12.04LTS.
But output file from my code is always 0-bytes (=immediate stop).
Please tell me if 64bit OS is useless.

=== Check after the problem (Q1) ===
address@hidden:~/beaconRX$ uhd_find_devices
linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.007.001-72-g383061d8

--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
    type: usrp1
    name:
    serial: 2R24X5U1


address@hidden:~/beaconRX$ uhd_usrp_probe
linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.007.001-72-g383061d8

-- Opening a USRP1 device...
Error: RuntimeError: usb rx6 submit failed: LIBUSB_ERROR_IO

==============================

Thanks for your help and suggestions.

-- 
Mamoru Yamamoto / RISH, Kyoto University
address@hidden
Phone +81-774-38-3814, Cell +81-90-5653-7555