[Discuss-gnuradio] mono_tone_delta44.py,

[Robert W. McGwier]

I have the ever popular amongst SDR sound card types: M-Audio Delta 44

The alsa driver for it hated:

gr-radio/gnuradio-examples/python/audio/mono_tone.py
as well as
gr-radio/gnuradio-examples/python/audio/dial_tone.py

a cheap trick fixed it and I call these mono_tone_delta44.py
and dial_tone_delta44.py respectively and these demonstrate what needs 
to be done.
n4hy:/opt/GnuRadio/gr-build/gnuradio-examples/python/audio # diff 
mono_tone.py mono_tone_delta44.py
33c33,34
<     src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 350, ampl)
---
>     src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 600, ampl)
>     srcnull = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 0, 0)
34a36,37
>     max_chan = dst.input_signature().max_streams()
>     limit_channels = max_chan - 1
35a39,41
>     if (limit_channels > 0):
>         for i in range (limit_channels):
>             fg.connect (srcnull, (dst, i+1))

as well as
n4hy:/opt/GnuRadio/gr-build/gnuradio-examples/python/audio # diff 
dial_tone.py dial_tone_delta44.py
32a33
>     srcnull = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 0, 0)
33a35
>     max_chan = dst.input_signature().max_streams()
36c38,42
<
---
>     limit_channels = max_chan - 2
>     if (limit_channels > 0):
>         for i in range(max_chan-2):
>             fg.connect(srcnull, (dst, i+2))
>           

Just tinkering around and making sure everything works.  These ICE based 
boards from M-Audio
have lots of gazintas and gazoutas supported by the ICE ASIC even when 
they are not physically
present.  There might be some control I could tickle in the ALSA ice 
control panel, but the trick
worked so well,  I went with it.

Bob