On 06/07/2014 06:05 PM, Mamoru Yamamoto wrote: > 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.>
Mamoru, in this case, the GNU Radio mailing list would have been better. You can also cross-post (i.e. post to both mailing lists at once), so we know you did this, and don't answer twice (as was the case here). I hope our responses have been helpful! Martin > > (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) === > beacon@Beacon-36:~/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 > > > beacon@Beacon-36:~/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. > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio