Re: [Discuss-gnuradio] ICE1712 and ALSA sink

[Alex DEKKER]

On Mon, 18 Jul 2011 19:20:55 +0200, Volker Schroer wrote:

> Here is an example that works for an Delta  M44 card  for input and 
> output
> This card uses the snd_ice1712 module.

Thanks for your help. I feel I must be getting closer; I specify 
SDR1000Play as the sink device, and I can now execute the simple flow 
graph I created! However, all I get is a click when I start the block, 
and a click when I end it. But it's coming out of the correct speakers, 
at least.

There's a simple example C++ NFM decoder with gr-fcd: 
https://github.com/csete/gr-fcd/blob/master/apps/fcd_nfm_rx.cc
If I change line 96 of fcd_nfm_rx.cc to:

    audio_sink::sptr sink = audio_make_sink(rate,"SDR1000Play");

recompile, re-run, I get

$ ./fcd_nfm_rx
> > > gr_fir_ccf: using 3DNow!
terminate called after throwing an instance of 'std::runtime_error'
  what():  audio_alsa_source(2): insufficient connected output ports 
(12 needed, 2 connected)
Aborted

Somehow it's not fooled by the .asoundrc, but I can substitute 
audio_make_sink(rate,"hw:2,0"); and decode NFM out of a USB sound card.

I can't get 
https://github.com/csete/gr-fcd/blob/master/apps/fcd_nfm_rx.grc to work 
with either a USB sound card, the M2496 or the M2496 with Volker's 
.asoundrc. The only output I get is

Executing: "/home/alex/downloads/radio/gr-fcd/apps/fcd_nfm_rx.py"

> > > gr_fir_ccc: using 3DNow!Ext
len(audio_taps) = 635
> > > gr_fir_fff: using 3DNow!
> > > gr_fir_ccf: using 3DNow!

> > > Done

I think I'm just going to give up on this PC and use the laptop with 
the FCD instead.

alexd