[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] need help getting simple exercise to work
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] need help getting simple exercise to work |
Date: |
Thu, 02 Jun 2005 12:05:14 -0700 |
User-agent: |
Mozilla Thunderbird 1.0 (X11/20041206) |
jmdaniel wrote:
> Hi,
>
> I've got gnuradio up and running and am now trying to get a better
> understanding of how to use it before beginning more involved
> projects. I am trying to write a py script that displays an oscope
> from a PCI-DAS4020/12. mc4020_fft.py runs and displays the
> excpected results. Here's the code that I've peiced together.
> File "/usr/local/lib/python2.3/site-packages/gnuradio/gr/basic_flow_
> graph.py", line 127, in _connect_prim
> self._check_type_match (src_endpoint, dst_endpoint)
> File "/usr/local/lib/python2.3/site-packages/gnuradio/gr/basic_flow_
> graph.py", line 238, in _check_type_match
> raise ValueError, 'source and destination data sizes are different '
> ValueError: source and destination data sizes are different
>
>
> I would greatly appreciate any help with understanding what is
> wrong here and how to fix it.
The 4020 returns 16 bit signed integers (shorts). The scopesink is
expecting floats. You need to put a gr.short_to_float () block in
between them.
Matt