Re: [Discuss-gnuradio] Capturing data to file

[Eric Blossom]

On Wed, Mar 22, 2006 at 10:51:19AM -0800, jjw wrote:
> 
> Has anybody had any experience using the capture_to_file.py code from KD7LMO? 
> (http://kd7lmo.net/ground_gnuradio_software.html)  I am interested in the
> functionality to set up an IF frequency and bandwidth and dump the data to a
> file.  When I have attempted to run the program I have encountered the
> following error....
> 
> address@hidden ~]$ ./capture_to_file.py narrowband_256k_complex.dat
> 10.7 250 30
> Capturing  7680000  samples
> Traceback (most recent call last):
>   File "./capture_to_file.py", line 67, in ?
>     main (sys.argv[1:])
>   File "./capture_to_file.py", line 63, in main
>     fg = build_graph (filename, IF_freq_hz, decim_rate, samples)
>   File "./capture_to_file.py", line 38, in build_graph
>     src = usrp.source_c (0, decim, 1, mux)
>   File "/home/jjw27370/gr/lib/python2.4/site-packages/gnuradio/usrp.py",
> line 242, in __init__
>     fpga_filename, firmware_filename)
>   File "/home/jjw27370/gr/lib/python2.4/site-packages/gnuradio/usrp1.py",
> line 1208, in source_c
>     return _usrp1.source_c(*args)
> TypeError: in method 'source_c', argument 4 of type 'int'
> 
> 
> It seems there is something wrong with the way that mux is declared in the
> capture_to_file.py code (0xf0f0f0f0).  According to Dawai Shen's tutorial on
> USRP (http://www.nd.edu/~dshen/GNU/Tutorial/4.html) 0xf0f0f0f0 should be a
> valid combination to use.  Maybe I am missing some trivial detail or maybe
> this code was designed for an older version of GNU Radio, but if anybody
> could shed some light on this issue or maybe knows of a better program for
> capturing data to a file, it would be helpful.  
> 
> Thanks,
> John

May I suggest you try gnuradio-examples/python/usrp/usrp_rx_cfile.py?
It handles all daughterboards, and basically just "does the right thing".
    
Eric