On Wed, Jul 05, 2006 at 10:32:36AM +0000, paul munro wrote:
> Ok, I have tried the TCP method with no real success. I have set GNUradio
> to be the client, Labview as the server. They connect, then the python
> script disconnects with errors before any data is communicated. I have
> tried a couple of different methods. 1) no framing or correlator, and
> 2) with gr.simple_correlator(1024)
>
> My code is as follows:
>
> # write to fd (socket)
> fd = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
> self.conn = fd.connect(('0.0.0.0',options.socket))
> print "Connecting to:", self.conn
> print "Address:", self.conn
> # sink to file descriptor
> self.dst = gr.file_descriptor_sink (gr.sizeof_gr_complex,
> fd.fileno())
> print ("data to socket")
>
> self.connect(self.u, self.dst)
>
> #self.corr = gr.simple_correlator (1024)
> #self.connect(self.u, self.corr, self.dst)
>
I'm pretty sure that "fd" is going out of scope and thus the underlying
file descriptor is closed.
This is what is causing:
> 1)when using no correlator the error I get is:
> gr_file_descriptor_sink: Bad file descriptor
Try assigning it to self.fd = socket.socket(...)
> 2) when using gr.simple_correlator(8) the error is:
> File
> "/usr/local/lib/python2.3/site-packages/gnuradio/gr/basic_flow_graph.py",
> line
> 242, in _check_type_match
> raise ValueError, 'source and destination data sizes are
> different'
You've got to connect things with the same size ins and outs together.
Sorry, the error message could use some improvement. It should tell
you the blocks involved.
> >From what I can gather, Labview reads x bytes (8 in my case) in string
> format. This string can then be recast to complex. I have done this reading
> from a file and pipes with no problems. I'm not sure if the problem is the
> tcp control or a lower level of gnuradio.
It's your python code. No problem with TCP or GNU Radio.
> Any suggestions??
Start with something more simple. E.g., have GNU Radio generate a
complex sinusoid using gr.sig_source_c and use TCP to send it to
labview.
Eric
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
