Re: [Discuss-gnuradio] NOOB needs help with simple.py

[Marcus Müller]

Hi Sebastian,
I admit I did not go through your whole post, since that would require
reading someone else's python. Most likely, that website is for an older
version of GNU Radio, and that's why you can't import some stuff;
gr.block_name looks like pre-3.7 GNU Radio.

I always encourage people to start off with the beginners' tutorials[1]
over at gnuradio.org, since we, as a community, try to make sure that
they don't become obsolete, and only look at tutorials elsewhere once
they are used to GNU Radio enough to understand what's going on with a
little research themselves.

So: do not be discouraged to continue learning, it's really fun and
rewarding!
Happy Hacking,
Marcus

[1] http://gnuradio.org/redmine/projects/gnuradio/wiki/Tutorials
As soon as you reach the WritePythonApplications tutorial, they even
have the signal-to-soundcard example, so no need to look elsewhere ;)


On 01.07.2014 22:20, Sebastian Heyn wrote:
> Hi all,
>
> I wanna work into this project, as I think its excellent!
> My box is a gentoo box running
>
> net-wireless/gnuradio-3.7.3:0/3.7.3  USE="alsa analog digital examples fcd 
> filter grc pager qt4 sdl uhd utils wavelet wxwidgets -doc -jack -oss 
> -performance-counters -portaudio" PYTHON_SINGLE_TARGET="python2_7" 
> PYTHON_TARGETS="python2_7" 
>
>
> For the first experiments I found this page giving a scope and fft display of 
> the soundcard input,
>
>
> http://www.funwithelectronics.com/?id=10
>
> the py file looks like this
>
> #!/usr/bin/env python
>
> from gnuradio import gr
> from gnuradio.wxgui import stdgui2,fftsink2,scopesink2
> import wx
>
> class gnuradioGUI(stdgui2.std_top_block):
>       def __init__(self,frame,panel,vbox,argv):
>               stdgui2.std_top_block.__init__(self,frame,panel,vbox,argv)
>               
>               fft = fftsink2.fft_sink_f(panel, title="FFT display", 
> fft_size=512, sample_rate=100000)
>               vbox.Add(fft.win,4,wx.EXPAND)
>               
>
>               scope = scopesink2.scope_sink_f(panel, title="Oscilloscope", 
> sample_rate=100000)
>               vbox.Add(scope.win,4,wx.EXPAND)
>               
>               signal = gr.sig_source_f(100000,gr.GR_SIN_WAVE,20000,1000,0)
>               throttle = gr.throttle(gr.sizeof_float,100000)
>               self.connect(signal,throttle)
>               self.connect(throttle,fft)
>               self.connect(throttle,scope)
>
> if __name__ == '__main__':
>       app = stdgui2.stdapp(gnuradioGUI,"A simple GNU Radio GUI")
>       app.MainLoop()
>       
>
>
>
> when I try to start this
>
> #python2.7 simple.py
>
> Using Volk machine: avx_32_mmx_orc
> Traceback (most recent call last):
>   File "./simplegui.py", line 25, in <module>
>     app = stdgui2.stdapp(gnuradioGUI,"A simple GNU Radio GUI")
>   File "/usr/lib/python2.7/site-packages/gnuradio/wxgui/stdgui2.py", line 46, 
> in __init__
>     wx.App.__init__ (self, redirect=False)
>   File "/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", 
> line 7981, in __init__
>     self._BootstrapApp()
>   File "/usr/lib/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", 
> line 7555, in _BootstrapApp
>     return _core_.PyApp__BootstrapApp(*args, **kwargs)
>   File "/usr/lib/python2.7/site-packages/gnuradio/wxgui/stdgui2.py", line 49, 
> in OnInit
>     frame = stdframe (self.top_block_maker, self.title, self._nstatus)
>   File "/usr/lib/python2.7/site-packages/gnuradio/wxgui/stdgui2.py", line 76, 
> in __init__
>     self.panel = stdpanel (self, self, top_block_maker)
>   File "/usr/lib/python2.7/site-packages/gnuradio/wxgui/stdgui2.py", line 98, 
> in __init__
>     self.top_block = top_block_maker (frame, self, vbox, sys.argv)
>   File "./simplegui.py", line 18, in __init__
>     signal = gr.sig_source_f(100000,gr.GR_SIN_WAVE,20000,1000,0)
> AttributeError: 'module' object has no attribute 'sig_source_f'
>
>
>
> but then nothing is displayed 
>
> can someone experienced please give me a hint??
>
>
>
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