[USRP-users] rx_samples_to_file issue

Marcus D. Leech mleech at ripnet.com
Wed Oct 1 23:39:01 EDT 2014

On 10/01/2014 11:34 PM, gsmandvoip wrote:
> Thank you for your reply,
> Yes it appeared to me as bug as well, but unable to figure out how to 
> get rid of it, please guide me.
> I want to record samples at 8M samples, using uhd_rx_cfile, gives me 
> lots of overrun (OOOOOOOOO) and I am unable to use that data, so 
> trying record without gnuradio overhead. By the way, I am using USRP1 
> along with DBRX1, while pc having ubuntu14.04 64 bit, 12 gb ram and i7 
> processor(which I think should not be bottleneck, please correct me if 
> I am wrong)
> Thanks
If you're only recording a single channel, then you don't need the 
usrp1_fpga_4rx.rbf FPGA image.

What exact parameters are you giving to uhd_rx_cfile?    It shouldn't be 
*that* much more overhead that rx_samples_to_file.

Also, why are you running a 32-bit system image on a 64-bit machine like 
the i7?  Are you running this in a VM by any chance?

> On Wed, Oct 1, 2014 at 9:54 PM, <mleech at ripnet.com 
> <mailto:mleech at ripnet.com>> wrote:
>     That actually looks like a bug in rx_samples_to_file, in that it's
>     checking *TX* DSP configuration, which will fail in this case because
>       with the 4rx image, there is no TX-side DSP at all.
>     On 2014-10-01 07:22, gsmandvoip via USRP-users wrote:
>>     Hi list,
>>     when I am trying to run rx_samples_to_file, with following command:
>>     ./rx_samples_to_file --args="fpga=usrp1_fpga_4rx.rbf" --freq
>>     "945000000" --rate="8000000" $FILE --nsamps
>>     getting following error:
>>     UHD Warning:
>>         Unable to set the thread priority. Performance may be
>>     negatively affected.
>>         Please see the general application notes in the manual for
>>     instructions.
>>         EnvironmentError: OSError: error in pthread_setschedparam
>>     Creating the usrp device with: fpga=usrp1_fpga_4rx.rbf...
>>     -- Loading firmware image: /usr/share/uhd/images/usrp1_fw.ihx... done
>>     -- Opening a USRP1 device...
>>     -- Loading FPGA image:
>>     /usr/share/uhd/images/usrp1_fpga_4rx.rbf... done
>>     -- Using FPGA clock rate of 52.000000MHz...
>>     Error: LookupError: IndexError: multi_usrp::get_tx_subdev_spec(0)
>>     failed to make default spec - ValueError: The subdevice
>>     specification "A:0" is too long.
>>     The user specified 1 channels, but there are only 0 tx dsps on
>>     mboard 0.
>>     Can any body throw some light, what mistake I am doing.
>>     I am using ubuntu 14.04, 32 bit, gnuradio, 3.7, uhd driver latest
>>     installation
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