On Wed, Apr 23, 2008 at 5:38 AM, Diana Iosifescu <[EMAIL PROTECTED]> wrote:
> Hello,
> I am a student at the University of Aveiro, Portugal and I have just
> started working at a project with GNU Radio and the USRP board.
> I have a question regarding the sample acquisition.
> I need to read the samples from both channels of a Basic Rx and then to
> write them in a file.
> Until now I have used the usrp_rx_cfile.py file, but it allows the
> acquisition from only one channel. My question is: can I acquire data in
> the same, from both channels?
> Thanks for any help.
> Diana
> --
> Posted via http://www.ruby-forum.com/.
I recently finished doing exactly this. The following code works for
me. I modified this from the multi_fft example file.
n_chans = 2;
self.rx_src = usrp.source_c()
rx_subdev = self.rx_src.db[0]+self.rx_src.db[1]
self.rx_src.set_mux(gru.hexint(0xf1f0f3f2))
deinterleaver = gr.deinterleave(gr.sizeof_gr_complex)
self.rx_src_fft0 = fftsink2.fft_sink_c(panel,title="Ch
RXB-A",fft_size=fftsize_N,sample_rate=rx_rate/sw_decim)
self.rx_src_fft0 = fftsink2.fft_sink_c(panel,title="Ch
RXB-B",fft_size=fftsize_N,sample_rate=rx_rate/sw_decim)
self.connect(self.rx_src,deinterleaver)
self.connect((deinterleaver,0),self.rx_src_fft0)
self.connect((deinterleaver,1),self.rx_src_fft1)
vbox.Add(self.rx_src_fft0.win,10,wx.EXPAND)
vbox.Add(self.rx_src_fft1.win,10,wx.EXPAND)
#Tune the receiver
for i in range(len(rx_subdev)):
r = self.rx_src.tune(rx_subdev[i]._which, rx_subdev[i],carrier_freq)
if not r:
print "set_freq: failed to set subdev[%d] freq to %f" %
(i, carrier_freq)
RXB-A appears on (deinterleaver,0) ad RXB-B appears on
(deinterleaver,1). If you are using RXA then you might want to replace
the mux value by something like 0xf3f2f1f0.
Regards,
Karthik
--
www.stanford.edu/~karthikv
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