Re: [Discuss-gnuradio] Scope sink + multiple channels

[Josh Blum]

I dont see how the current scope sink can have more than one channel. 
However, you could change the scopesink2's scope_sink_f to connect all 
possible 16 inputs. Of course, this would only work with the hier2 
stuff, but you would be able to use any number of inputs (1-16) without 
fuss. This little trick will not work for the complex inputs. For 
complex, you would have to use the scope_sink_f, and place a bunch of 
complex to floats on the outside of the block.

-Josh

Possible Patch:

--- scopesink2.py       2007-07-17 04:04:18.000000000 -0400
+++ scopesink2_16.py    2007-07-17 04:06:09.000000000 -0400
@@ -38,12 +38,12 @@
                  v_scale=default_v_scale, t_scale=None):

         gr.hier_block2.__init__(self, "scope_sink_f",
-                                gr.io_signature(1, 1, gr.sizeof_float),
+                                gr.io_signature(1, 16, gr.sizeof_float),
                                 gr.io_signature(0,0,0))

         msgq = gr.msg_queue(2)         # message queue that holds at 
most 2 messages
         self.guts = gr.oscope_sink_f(sample_rate, msgq)
-        self.connect(self, self.guts)
+        for i in range(16): self.connect((self, i), (self.guts, i))

         self.win = scope_window(win_info (msgq, sample_rate, frame_decim,
                                           v_scale, t_scale, self.guts, 
title), parent)


Jeffrey Karrels wrote:
> Indeed the float allows more than 2 channels. I will take a look at
> the complex scope to see what needs to be fixed.  You know I am
> continually amazed by this software! I was just thinking how nice it
> would be to have the magnitude displayed and BAM, complex_to_mag
> presented itself.
>
> This is great stuff!
>
> On 7/6/07, Jeffrey Karrels <address@hidden> wrote:
> > Thanks I will take a look at it.
> >
> > On 7/6/07, Matt Ettus <address@hidden> wrote:
> > > Jeffrey Karrels wrote:
> > > > Sorry I was being lazy, I should have further defined my issue.
> > > > ...
> > > > from gnuradio.wxgui import scopesink
> > > > ...
> > > > self.scope = scopesink.scope_sink_c(self, panel,
> > > > sample_rate=input_rate,...)
> > > > ...
> > > >
> > > > self.connect(xf, (self.scope,0))
> > > > self.connect(d, (self.scope,1))
> > > > -------------------------------------------------------------
> > > > The second connect gives me the following error:
> > > >
> > > > raise ValueError, 'port number out of range.'
> > > > ValueError: port number out of range.
> > > >
> > > > Am I using the wrong scope? Do I have to add channels some how?
> > > >
> > > >
> > >
> > > I think you may need to use the _f version, and pass your complex
> > > signals through a complex to float conversion.  The float scope 
> > takes up
> > > to 4 signals.
> > >
> > > Patches welcome :)
> > >
> > > Matt
> > >
>
>
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