Re: [Discuss-gnuradio] GRC question

[Scott Bierly]

Thanks Josh!  That did the trick.  I actually had to change a sink too, I've attached the file for reference, and here's the diff:

address@hidden:~/src/gnuradio/grc/src/grc_gnuradio/usrp$ diff simple_usrp.py simple_usrp.py.save 
336,337c336,337
< class dual_source_c(_dual_source): constructor = (usrp.source_c, )
< class dual_source_s(_dual_source): constructor = (usrp.source_s, )
---
> class dual_source_c(_dual_source): constructor = usrp.source_c
> class dual_source_s(_dual_source): constructor = usrp.source_s
377,378c377,378
< class dual_sink_c(_dual_sink): constructor = (usrp.sink_c, )
< class dual_sink_s(_dual_sink): constructor = (usrp.sink_s, )
---
> class dual_sink_c(_dual_sink): constructor = usrp.sink_c
> class dual_sink_s(_dual_sink): constructor = usrp.sink_s

I can build dual grc flowgraphs fine now.  As soon as I decipher how to setup the RX/TX muxes, I'll be in business!  The zero setting for "auto" does not seem to choose well for these dual cases.  I've discovered that 0x32103210 allows me to build a dual Spectrum analyzer using a pair of RFX900's, although I don't know why that setting works.  I can't get a dual Siggen to work yet, but I'll keep hacking....

--Scott

PS:  GRC is really awesome

On Sun, Jan 25, 2009 at 1:52 AM, Josh Blum <address@hidden> wrote:

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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simple_usrp.py
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