Re: [Discuss-gnuradio] two RX paths

[Nemanja Savic]

Everything is OK, I have just put "B:A A:0" in the subdevice field.

On Wed, Dec 4, 2013 at 10:47 AM, Nemanja Savic <address@hidden> wrote:

I did following: I made simple flow graph and used USRP source first with two channels and LFTX mboard. But the follwong error occurs:

  File "/home/savi_ne/work/gnuradio/GRC/top_block.py", line 105, in __init__
    self.uhd_usrp_source_0_0_1.set_center_freq(433900000, 1)
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/uhd/uhd_swig.py", line 1872, in set_center_freq
    return _uhd_swig.uhd_usrp_source_sptr_set_center_freq(self, *args)
RuntimeError: vector::_M_range_check

When I tried with setting two mboards, with LFTX A channel subdevice in the first channel (B:A option_ and WBX on the second channel I get following error:

  File "./top_block.py", line 101, in __init__
    self.uhd_usrp_source_0_0_1.set_subdev_spec("A:0", 1)
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/uhd/uhd_swig.py", line 1831, in set_subdev_spec
    return _uhd_swig.uhd_usrp_source_sptr_set_subdev_spec(self, *args, **kwargs)
RuntimeError: vector::_M_range_check

And as far as I have seen GRC doesn't put anything in the field device_addr for changing FPGA image.

On Tue, Dec 3, 2013 at 6:03 PM, Marcus D. Leech <address@hidden> wrote:

On 12/03/2013 12:00 PM, Nemanja Savic wrote:

Thank you Marcus again,

I changed device address, in both places, but the same problem appears. I see that it loads now 4rx image, but the problem remains.

        self.uhd_usrp_source_1 = uhd.usrp_source(
            device_addr="fpga=usrp1_fpga_4rx.rbf",
            stream_args=uhd.stream_args(
                cpu_format="fc32",
                channels=range(1),
            ),
        )

You should probably start with a GRC flow-graph with a single UHD USRP source, with two channels being what you want, and look at the generated
  Python code.

--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

--
Nemanja Savić

--
Nemanja Savić