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Re: [Discuss-gnuradio] Receiving on both sub devices at the same time (L

From: Karthik
Subject: Re: [Discuss-gnuradio] Receiving on both sub devices at the same time (LFRX)
Date: Mon, 16 Feb 2009 11:33:04 -0800

On Mon, Feb 16, 2009 at 1:35 AM, Einar Thorsrud <address@hidden> wrote:
Hi all helpful GR people  :)

I am trying to combine the two sub device on a LFRX card, but I can not find any documentation on the USRP dual source. GRC has it's own block "grc_usrp.dual_source_c", but using this (configured with GRC) I get the error:

TypeError: __init__() got an unexpected keyword argument 'side_b'

How can this be overcome?

I am not able to find a dual source from the plain GR library, but it may exist? However, I have tried to use two separate USRP sources and specify separate sub devices on the two:

This however also fails. It seams the reason is that the USRP is already taken by the first instance:

usrp_open_interface:usb_claim_interface: failed interface 2
usb_claim_interface: couldn't claim interface
usrp_basic_rx: can't open rx interface

What then is the correct way to receive on both sub devices on the same time?

- Einar

I Use 2 LFRX boards to get 4 channels (for only 2 channels you don't have to do anything special as the default image handles that automatically) of real data each sampled at 2Msps. Here is the python code to do that. I think you are looking for the second line.

self.rx_src = usrp.source_c(fpga_filename="std_4rx_0tx.rbf")
rx_subdev = self.rx_src.db[0]+self.rx_src.db[1]
        self.rx_src.set_mux(gru.hexint(0xf3f2f1f0)) #Sets all Q to zero
deinterleaver_usrp = gr.deinterleave(gr.sizeof_gr_complex)

Real [(deinterleaver_usrp,0)]  --> SideAA
Real [(deinterleaver_usrp,1)]  --> SideAB
Real [(deinterleaver_usrp,2)]  --> SideBA
Real [(deinterleaver_usrp,3)]  --> SideBB

Hope that helps.


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