Re: [Discuss-gnuradio] GRC question

[Josh Blum]

Funny, I was working on exactly this. The usrp dual source is 
underutilized, and Im giving the grc/usrp api an overhaul. It will be 
tested and checked in on monday.

The bug you are getting now is due to me forgetting to 100% fix 
something after the daughter board c++ switcheroo. So for now, in 
grc/src/grc_gnuradio/usrp/simple_usrp.py... look for

constructor = usrp.source_c

and replace it with

constructor = (usrp.source_c, )

sudo make install

Scott Bierly wrote:
> Has anyone successfully used GRC with  USRP Dual Source and/or USRP Dual
> Sink blocks?  The attached .grc file and .py file are my simple test case,
> which bombs like this:
>
> Generating: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"
>
> Executing: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"
>
> Traceback (most recent call last):
>   File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
> 72, in <module>
>     tb = Scott_Dual_FFT_RFX900()
>   File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
> 45, in __init__
>     tx_enb_b=True,
>   File
> "/usr/local/lib/python2.5/site-packages/grc_gnuradio/usrp/simple_usrp.py",
> line 360, in __init__
>     gr.io_signature(2, 2, constructor_to_size[self.constructor[0]]),
> TypeError: 'instancemethod' object is unsubscriptable
>
>
> I added the Sink to see what would happen, but originally only had the USRP
> Dual Source as a simple diagnostic test, and that bombed this way:
>
> Generating: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"
>
> Executing: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"
>
> Traceback (most recent call last):
>   File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
> 56, in <module>
>     tb = Scott_Dual_FFT_RFX900()
>   File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
> 43, in __init__
>     rx_ant_b="RX2",
>   File
> "/usr/local/lib/python2.5/site-packages/grc_gnuradio/usrp/simple_usrp.py",
> line 320, in __init__
>     gr.io_signature(2, 2, constructor_to_size[self.constructor[0]]),
> TypeError: 'instancemethod' object is unsubscriptable
>
> > > > Done
>
>
> I'm having a hard time figuring out from this what I might have done wrong.
> I will confess I don't understand how to setup the mux yet, but that does
> not appear to be related to this problem.
>
> I'm running off the subversion gnuradio build 10260, which contains GRC
> version 3.1SVN.
>
> Thanks for any help.
> --Scott
>
>
>
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