--- /dev/null
+#!/usr/bin/env python
+#
+# Copyright 2005,2006,2007,2008 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gru, eng_notation, optfir
+from gnuradio import audio
+from gnuradio import usrp2
+from gnuradio import blks2
+from gnuradio.eng_option import eng_option
+from gnuradio.wxgui import slider, powermate
+from gnuradio.wxgui import stdgui2, fftsink2, form
+from optparse import OptionParser
+import sys
+import math
+import wx
+
+class wfm_rx_block (stdgui2.std_top_block):
+ def __init__(self,frame,panel,vbox,argv):
+ stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
+
+ parser = OptionParser(option_class=eng_option)
+ parser.add_option("-e", "--interface", type="string", default="eth0",
+ help="select Ethernet interface, default is eth0")
+ parser.add_option("-m", "--mac-addr", type="string", default="",
+ help="select USRP by MAC address, default is auto-select")
+ #parser.add_option("-A", "--antenna", default=None,
+ # help="select Rx Antenna (only on RFX-series boards)")
+ parser.add_option("-f", "--freq", type="eng_float", default=100.1,
+ help="set frequency to FREQ", metavar="FREQ")
+ parser.add_option("-g", "--gain", type="eng_float", default=None,
+ help="set gain in dB (default is midpoint)")
+ parser.add_option("-V", "--volume", type="eng_float", default=None,
+ help="set volume (default is midpoint)")
+ parser.add_option("-O", "--audio-output", type="string", default="",
+ help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
+
+ (options, args) = parser.parse_args()
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ self.frame = frame
+ self.panel = panel
+
+ self.vol = 0
+ self.state = "FREQ"
+ self.freq = 0
+
+ # build graph
+
+ self.u = usrp2.source_32fc(options.interface, options.mac_addr)
+
+ adc_rate = self.u.adc_rate() # 100 MS/s
+ usrp_decim = 312
+ self.u.set_decim(usrp_decim)
+ usrp_rate = adc_rate / usrp_decim # ~320 kS/s
+ chanfilt_decim = 1
+ demod_rate = usrp_rate / chanfilt_decim
+ audio_decimation = 10
+ audio_rate = demod_rate / audio_decimation # ~32 kHz
+
+ print "Using RX d'board 0x%04X" % (self.u.daughterboard_id(),)
+
+ chan_filt_coeffs = optfir.low_pass (1, # gain
+ usrp_rate, # sampling rate
+ 80e3, # passband cutoff
+ 115e3, # stopband cutoff
+ 0.1, # passband ripple
+ 60) # stopband attenuation
+ #print len(chan_filt_coeffs)
+ chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
+
+ self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
+
+ self.volume_control = gr.multiply_const_ff(self.vol)
+
+ # sound card as final sink
+ audio_sink = audio.sink (int (audio_rate),
+ options.audio_output,
+ False) # ok_to_block
+
+ # now wire it all together
+ self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
+
+ self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
+
+ if options.gain is None:
+ # if no gain was specified, use the mid-point in dB
+ g = self.u.gain_range()
+ options.gain = float(g[0]+g[1])/2
+
+ if options.volume is None:
+ g = self.volume_range()
+ options.volume = float(g[0]+g[1])/2
+
+ if abs(options.freq) < 1e6:
+ options.freq *= 1e6
+
+ # set initial values
+
+ self.set_gain(options.gain)
+ self.set_vol(options.volume)
+ if not(self.set_freq(options.freq)):
+ self._set_status_msg("Failed to set initial frequency")
+
+
+ def _set_status_msg(self, msg, which=0):
+ self.frame.GetStatusBar().SetStatusText(msg, which)
+
+
+ def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
+
+ def _form_set_freq(kv):
+ return self.set_freq(kv['freq'])
+
+
+ if 1:
+ self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP2",
+ fft_size=512, sample_rate=usrp_rate,
+ ref_scale=1.0, ref_level=0, y_divs=12)
+ self.connect (self.u, self.src_fft)
+ vbox.Add (self.src_fft.win, 4, wx.EXPAND)
+
+ if 1:
+ post_filt_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
+ fft_size=1024, sample_rate=usrp_rate,
+ y_per_div=10, ref_level=0)
+ self.connect (self.guts.fm_demod, post_filt_fft)
+ vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
+
+ if 0:
+ post_deemph_fft = fftsink2.fft_sink_f(self.panel, title="Post Deemph",
+ fft_size=512, sample_rate=audio_rate,
+ y_per_div=10, ref_level=-20)
+ self.connect (self.guts.deemph, post_deemph_fft)
+ vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
+
+
+ # control area form at bottom
+ self.myform = myform = form.form()
+
+ hbox = wx.BoxSizer(wx.HORIZONTAL)
+ hbox.Add((5,0), 0)
+ myform['freq'] = form.float_field(
+ parent=self.panel, sizer=hbox, label="Freq", weight=1,
+ callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
+
+ hbox.Add((5,0), 0)
+ myform['freq_slider'] = \
+ form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
+ range=(87.9e6, 108.1e6, 0.1e6),
+ callback=self.set_freq)
+ hbox.Add((5,0), 0)
+ vbox.Add(hbox, 0, wx.EXPAND)
+
+ hbox = wx.BoxSizer(wx.HORIZONTAL)
+ hbox.Add((5,0), 0)
+
+ myform['volume'] = \
+ form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
+ weight=3, range=self.volume_range(),
+ callback=self.set_vol)
+ hbox.Add((5,0), 1)
+
+ myform['gain'] = \
+ form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
+ weight=3, range=self.u.gain_range(),
+ callback=self.set_gain)
+ hbox.Add((5,0), 0)
+ vbox.Add(hbox, 0, wx.EXPAND)
+
+ try:
+ self.knob = powermate.powermate(self.frame)
+ self.rot = 0
+ powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
+ powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
+ except:
+ pass
+ #print "FYI: No Powermate or Contour Knob found"
+
+
+ def on_rotate (self, event):
+ self.rot += event.delta
+ if (self.state == "FREQ"):
+ if self.rot >= 3:
+ self.set_freq(self.freq + .1e6)
+ self.rot -= 3
+ elif self.rot <=-3:
+ self.set_freq(self.freq - .1e6)
+ self.rot += 3
+ else:
+ step = self.volume_range()[2]
+ if self.rot >= 3:
+ self.set_vol(self.vol + step)
+ self.rot -= 3
+ elif self.rot <=-3:
+ self.set_vol(self.vol - step)
+ self.rot += 3
+
+ def on_button (self, event):
+ if event.value == 0: # button up
+ return
+ self.rot = 0
+ if self.state == "FREQ":
+ self.state = "VOL"
+ else:
+ self.state = "FREQ"
+ self.update_status_bar ()
+
+
+ def set_vol (self, vol):
+ g = self.volume_range()
+ self.vol = max(g[0], min(g[1], vol))
+ self.volume_control.set_k(10**(self.vol/10))
+ self.myform['volume'].set_value(self.vol)
+ self.update_status_bar ()
+
+ def set_freq(self, target_freq):
+ """
+ Set the center frequency we're interested in.
+
+ @param target_freq: frequency in Hz
+ @rypte: bool
+
+ Tuning is a two step process. First we ask the front-end to
+ tune as close to the desired frequency as it can. Then we use
+ the result of that operation and our target_frequency to
+ determine the value for the digital down converter.
+ """
+ r = self.u.set_center_freq(target_freq)
+ if r:
+ self.freq = target_freq
+ self.myform['freq'].set_value(target_freq) # update displayed value
+ self.myform['freq_slider'].set_value(target_freq) # update displayed value
+ self.update_status_bar()
+ self._set_status_msg("OK", 0)
+ return True
+
+ self._set_status_msg("Failed", 0)
+ return False
+
+ def set_gain(self, gain):
+ self.myform['gain'].set_value(gain) # update displayed value
+ self.u.set_gain(gain)
+
+ def update_status_bar (self):
+ msg = "Volume:%r Setting:%s" % (self.vol, self.state)
+ self._set_status_msg(msg, 1)
+ self.src_fft.set_baseband_freq(self.freq)
+
+ def volume_range(self):
+ return (-20.0, 0.0, 0.5)
+
+
+if __name__ == '__main__':
+ app = stdgui2.stdapp (wfm_rx_block, "USRP2 WFM RX")
+ app.MainLoop ()
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