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Re: [Discuss-gnuradio] Extracting intermediate data
From: |
Martin DvH |
Subject: |
Re: [Discuss-gnuradio] Extracting intermediate data |
Date: |
Wed, 21 Jan 2009 02:50:09 +0100 |
On Tue, 2009-01-20 at 15:33 -0500, Catalin Lacatus wrote:
> Hello,
>
> I am working with usrp_spectrum_sense.py and I am trying to analyze the
> intermediate data from different DSP blocks.
>
> After I passed the input stream to a vector I tried to save this information
> on a file like this:
>
>
>
> /s2v = gr.stream_to_vector(gr.sizeof_gr_complex, self.fft_size)
>
> output2=gr.file_sink(gr.sizeof_gr_complex,"file2.txt")
>
> self.connect(self.u, s2v, output2)/
>
You should have written
output2=gr.file_sink(gr.sizeof_gr_complex*self.fft_size,"file2.txt")
You are now getting vectors of 128 complex values as one item.
Success,
Martin
>
>
>
>
> and I received the following error:
>
>
>
> /node1-2:~/gnuradio/gnuradio-examples/python/usrp# ./usrp_spectrum_sense.py
> -F 16 4.5M 7.5M
>
> Using RX d'board A: Basic Rx
>
> Traceback (most recent call last):
>
> File "./usrp_spectrum_sense.py", line 305, in <module>
>
> tb = my_top_block()
>
> File "./usrp_spectrum_sense.py", line 179, in __init__
>
> self.connect(self.u, s2v, output2)
>
> File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py",
> line 70, in connect
>
> self._connect(points[i-1], points[i])
>
> File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py",
> line 76, in _connect
>
> dst_block.basic_block(), dst_port)
>
> File
> "/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py",
> line 1469, in connect
>
> return _gnuradio_swig_py_runtime.gr_top_block_sptr_connect(*args)
>
> ValueError: itemsize mismatch: stream_to_vector(4):0 using 128,
> file_sink(5):0 using 8/
>
> / /
>
>
>
> It seems to be a format mismatch.
> Please any advice how to write the output of s2v to a file.
>
>
>
> Thank you,
> Catalin
>
>
>
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