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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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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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

Yes I am running single channel, but when trying to achieve my desired
sampling rate without _4rx.rbf, it says, requested sampling rate is
not valid, adjusting to some 3.9M or so.
sorry for misleading info I gave earlier, I have i3, with 32 bit and
i7 with 64 bit, but getting same result on both machines

Here is my command to capture signal:

./rx_samples_to_file --args="fpga=usrp1_fpga_4rx.rbf, subdev=DBSRX"
--freq "$FC" --rate="$SR" $FILE --nsamps "$NSAMPLES"

and here is its output:

Creating the usrp device with: fpga=usrp1_fpga_4rx.rbf, subdev=DBSRX...
-- 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.

On 10/01/2014 11:46 PM, gsmandvoip wrote:

Yes I am running single channel, but when trying to achieve my desired
sampling rate without _4rx.rbf, it says, requested sampling rate is not
valid, adjusting to some 3.9M or so.
sorry for misleading info I gave earlier, I have i3, with 32 bit and i7
with 64 bit, but getting same result on both machines

Here is my command to capture signal:

./rx_samples_to_file --args="fpga=usrp1_fpga_4rx.rbf, subdev=DBSRX"
--freq "$FC" --rate="$SR" $FILE --nsamps "$NSAMPLES"

and here is its output:

Creating the usrp device with: fpga=usrp1_fpga_4rx.rbf, subdev=DBSRX...
-- 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.

Don't use the _4rx image if you don't need it.

The USRP1 only does strict-integer resampling, and with a master clock
(NON STANDARD FOR USRP1) of 52.000MHz, 4Msps is not a sample rate
that it can produce.  Try 5.2Msps or 4.3333Msps.

At 5.2Msps, it's recording at roughly 20.8Mbytes/second, so your system
needs to be able to sustain that for at least as long as the capture lasts.

with  rx_samples_to_file without _4rx.rbf, Initially I tried on my i3,
4GB ram, it gave me
some OOOO but was lesser than earlier, but I do not understand, my
most of the ram capacity and processor was sitting idle while it shows
OOOO, why is this strange behaviour