Re: [Discuss-gnuradio] writin oscope on python

[Josh Blum]

I recommend making this application with the gnuradio companion and then 
you can inspect/modify/learn-from the generated python code.

http://gnuradio.org/redmine/wiki/gnuradio/GNURadioCompanion

-Josh

see below

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On 07/11/2010 05:33 AM, mehmet kabasakal wrote:
> Hi everyone,
>
> I want to see a simple cosine signal on oscope by writing a pyhton code.
> I am using scopesink2.scope_sink_c tool. The code is below:
>
> and I got this error message:
> address@hidden Desktop]# python mehmet_rx.py
> Traceback (most recent call last):
>    File "mehmet_rx.py", line 99, in<module>
>      my_top_block().run()
>    File "mehmet_rx.py", line 87, in __init__
>      num_inputs=0,
>    File "/usr/lib/python2.6/site-packages/gnuradio/wxgui/scopesink_gl.py",
> line 144, in __init__
>      msg_key=MSG_KEY,
>    File "/usr/lib/python2.6/site-packages/gnuradio/wxgui/scope_window.py",
> line 430, in __init__
>      wx.Panel.__init__(self, parent, style=wx.SIMPLE_BORDER)
>    File "/usr/lib/python2.6/site-packages/wx-2.8-gtk2-unicode/wx/_windows.py",
> line 68, in __init__
>      _windows_.Panel_swiginit(self,_windows_.new_Panel(*args, **kwargs))
> TypeError: in method 'new_Panel', expected argument 1 of type 'wxWindow *'
>
>
> The python code:
>
> from gnuradio import gr, usrp
> from gnuradio.wxgui import stdgui2, scopesink2, fftsink2, form
> import wx
>
> class my_top_block(gr.top_block):
>
>      def __init__(self):
>          gr.top_block.__init__(self)
>
>         sample_rate = 320000
>          ampl = 1000
>         decimation = 200
>         frequency = 1700000000  
>         gain = 1000
>
>
>         #create the usrp source
>         #0 represents the USRP number (in case you have multiple USRPs)
>         u = usrp.source_c(0)
>
>         #Set the decimation
>         u.set_decim_rate(decimation)
>
>         #Automatically choose the sub device
>         #(this can be done manually, see below)
>         subdev_spec = usrp.pick_rx_subdevice(u)
>
>         #Set the mux
>         u.set_mux(usrp.determine_rx_mux_value(u, subdev_spec))
>
>         #get the sub-device
>         subdev = usrp.selected_subdev(u, subdev_spec)
>
>         #Select receive antenna ('TX/RX' or 'RX2'): flex boards only!
>         subdev.select_rx_antenna('TX/RX')
>
>         #Set the gain
>         subdev.set_gain(gain)
>
>         #Tune the center frequency
>         u.tune(0, subdev, frequency)
>
>         self.wxgui_scopesink2_0 = scopesink2.scope_sink_c(
>                         self,

self is a gr.top_block not a wx panel

>                         title="Scope Plot",
>                         sample_rate=320000,
>                         v_scale=0,
>                         t_scale=0,
>                         ac_couple=False,
>                         xy_mode=False,
>                         num_inputs=1,
>                 )
>
>         self.connect((u, 0), (self.wxgui_scopesink2_0, 0))
>
> if __name__ == '__main__':
>      try:
>         my_top_block().run()
>      except KeyboardInterrupt:
>         pass
>
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