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   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2005,2006,2007 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GNU Radio
   6 #
   7 # GNU Radio is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3, or (at your option)
  10 # any later version.
  11 #
  12 # GNU Radio is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GNU Radio; see the file COPYING.  If not, write to
  19 # the Free Software Foundation, Inc., 51 Franklin Street,
  20 # Boston, MA 02110-1301, USA.
  21 #
  22
  23 from gnuradio import gr, gru, eng_notation, optfir
  24 from gnuradio import audio
  25 from gnuradio import usrp
  26 from gnuradio import blks2
  27 from gnuradio.eng_option import eng_option
  28 from gnuradio.wxgui import slider, powermate
  29 from gnuradio.wxgui import stdgui2, fftsink2, form, scopesink2
  30 from optparse import OptionParser
  31 from usrpm import usrp_dbid
  32 import sys
  33 import math
  34 import wx
  35
  36 def pick_subdevice(u):
  37     """
  38     The user didn't specify a subdevice on the command line.
  39     Try for one of these, in order: TV_RX, BASIC_RX, whatever is on side A.
  40
  41     @return a subdev_spec
  42     """
  43     return usrp.pick_subdev(u, (usrp_dbid.TV_RX,
  44                                 usrp_dbid.TV_RX_REV_2,
  45                                 usrp_dbid.TV_RX_REV_3,
  46                                 usrp_dbid.BASIC_RX))
  47
  48 class wfm_rx_block (stdgui2.std_top_block):
  49     def __init__(self,frame,panel,vbox,argv):
  50         stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
  51
  52         parser=OptionParser(option_class=eng_option)
  53         parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
  54                           help="select USRP Rx side A or B (default=A)")
  55         parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
  56                           help="set frequency to FREQ", metavar="FREQ")
  57         parser.add_option("-g", "--gain", type="eng_float", default=65,
  58                           help="set gain in dB (default is midpoint)")
  59         parser.add_option("-s", "--squelch", type="eng_float", default=0,
  60                           help="set squelch level (default is 0)")
  61         parser.add_option("-V", "--volume", type="eng_float", default=None,
  62                           help="set volume (default is midpoint)")
  63         parser.add_option("-O", "--audio-output", type="string", default="",
  64                           help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
  65
  66
  67         (options, args) = parser.parse_args()
  68         if len(args) != 0:
  69             parser.print_help()
  70             sys.exit(1)
  71
  72         self.frame = frame
  73         self.panel = panel
  74
  75         self.vol = 0
  76         self.state = "FREQ"
  77         self.freq = 0
  78
  79         # build graph
  80
  81         self.u = usrp.source_c()                    # usrp is data source
  82
  83         adc_rate = self.u.adc_rate()                # 64 MS/s
  84         usrp_decim = 200
  85         self.u.set_decim_rate(usrp_decim)
  86         usrp_rate = adc_rate / usrp_decim           # 320 kS/s
  87         chanfilt_decim = 1
  88         demod_rate = usrp_rate / chanfilt_decim
  89         audio_decimation = 10
  90         audio_rate = demod_rate / audio_decimation  # 32 kHz
  91
  92         if options.rx_subdev_spec is None:
  93             options.rx_subdev_spec = pick_subdevice(self.u)
  94
  95         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
  96         self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
  97
  98
  99         chan_filt_coeffs = optfir.low_pass (1,           # gain
 100                                             usrp_rate,   # sampling rate
 101                                             80e3,        # passband cutoff
 102                                             115e3,       # stopband cutoff
 103                                             0.1,         # passband ripple
 104                                             60)          # stopband attenuation
 105         #print len(chan_filt_coeffs)
 106         chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
 107
 108
 109         #self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
 110         self.guts = blks2.wfm_rcv_pll (demod_rate, audio_decimation)
 111
 112         # FIXME rework {add,multiply}_const_* to handle multiple streams
 113         self.volume_control_l = gr.multiply_const_ff(self.vol)
 114         self.volume_control_r = gr.multiply_const_ff(self.vol)
 115
 116         # sound card as final sink
 117         audio_sink = audio.sink (int (audio_rate),
 118                                  options.audio_output,
 119                                  False)   # ok_to_block
 120
 121         # now wire it all together
 122         self.connect (self.u, chan_filt, self.guts)
 123         self.connect ((self.guts, 0), self.volume_control_l, (audio_sink, 0))
 124         self.connect ((self.guts, 1), self.volume_control_r, (audio_sink, 1))
 125         try:
 126           self.guts.stereo_carrier_pll_recovery.squelch_enable(True)
 127         except:
 128           print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
 129
 130
 131         self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
 132
 133         if options.gain is None:
 134             # if no gain was specified, use the mid-point in dB
 135             g = self.subdev.gain_range()
 136             options.gain = float(g[0]+g[1])/2
 137
 138         if options.volume is None:
 139             g = self.volume_range()
 140             options.volume = float(g[0]+g[1])/2
 141
 142         if abs(options.freq) < 1e6:
 143             options.freq *= 1e6
 144
 145         # set initial values
 146
 147         self.set_gain(options.gain)
 148         self.set_vol(options.volume)
 149         try:
 150           self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch)
 151         except:
 152           print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
 153
 154         if not(self.set_freq(options.freq)):
 155             self._set_status_msg("Failed to set initial frequency")
 156
 157
 158     def _set_status_msg(self, msg, which=0):
 159         self.frame.GetStatusBar().SetStatusText(msg, which)
 160
 161
 162     def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
 163
 164         def _form_set_freq(kv):
 165             return self.set_freq(kv['freq'])
 166
 167
 168         if 1:
 169             self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
 170                                                fft_size=512, sample_rate=usrp_rate,
 171                                                ref_scale=32768.0, ref_level=0, y_divs=12)
 172             self.connect (self.u, self.src_fft)
 173             vbox.Add (self.src_fft.win, 4, wx.EXPAND)
 174
 175         if 1:
 176             post_fm_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post FM Demod",
 177                                                     fft_size=512, sample_rate=demod_rate,
 178                                                     y_per_div=10, ref_level=0)
 179             self.connect (self.guts.fm_demod, post_fm_demod_fft)
 180             vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
 181
 182         if 0:
 183             post_stereo_carrier_generator_fft = fftsink2.fft_sink_c (self.panel, title="Post Stereo_carrier_generator",
 184                                                   fft_size=512, sample_rate=audio_rate,
 185                                                   y_per_div=10, ref_level=0)
 186             self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
 187             vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
 188
 189         if 0:
 190             post_deemphasis_left = fftsink2.fft_sink_f (self.panel, title="Post_Deemphasis_Left",
 191                                                   fft_size=512, sample_rate=audio_rate,
 192                                                   y_per_div=10, ref_level=0)
 193             self.connect (self.guts.deemph_Left, post_deemphasis_left)
 194             vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
 195
 196         if 0:
 197             post_deemphasis_right = fftsink2.fft_sink_f(self.panel, title="Post_Deemphasis_Right",
 198                                                   fft_size=512, sample_rate=audio_rate,
 199                                                   y_per_div=10, ref_level=-20)
 200             self.connect (self.guts.deemph_Left, post_deemphasis_right)
 201             vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
 202
 203
 204         if 0:
 205             LmR_fft = fftsink2.fft_sink_f(self.panel, title="LmR",
 206                                           fft_size=512, sample_rate=audio_rate,
 207                                           y_per_div=10, ref_level=-20)
 208             self.connect (self.guts.LmR_real,LmR_fft)
 209             vbox.Add (LmR_fft.win, 4, wx.EXPAND)
 210
 211         if 0:
 212             self.scope = scopesink2.scope_sink_f(self.panel, sample_rate=demod_rate)
 213             self.connect (self.guts.fm_demod_a,self.scope)
 214             vbox.Add (self.scope.win,4,wx.EXPAND)
 215
 216         # control area form at bottom
 217         self.myform = myform = form.form()
 218
 219         hbox = wx.BoxSizer(wx.HORIZONTAL)
 220         hbox.Add((5,0), 0)
 221         myform['freq'] = form.float_field(
 222             parent=self.panel, sizer=hbox, label="Freq", weight=1,
 223             callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
 224
 225         hbox.Add((5,0), 0)
 226         myform['freq_slider'] = \
 227             form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
 228                                         range=(87.9e6, 108.1e6, 0.1e6),
 229                                         callback=self.set_freq)
 230         hbox.Add((5,0), 0)
 231         vbox.Add(hbox, 0, wx.EXPAND)
 232
 233         hbox = wx.BoxSizer(wx.HORIZONTAL)
 234         hbox.Add((5,0), 0)
 235
 236         myform['volume'] = \
 237             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
 238                                         weight=3, range=self.volume_range(),
 239                                         callback=self.set_vol)
 240         hbox.Add((5,0), 1)
 241
 242         myform['gain'] = \
 243             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
 244                                         weight=3, range=self.subdev.gain_range(),
 245                                         callback=self.set_gain)
 246         hbox.Add((5,0), 0)
 247
 248         myform['sqlch_thrsh'] = \
 249             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
 250                                         weight=3, range=(0.0,1.0,0.01),
 251                                         callback=self.set_squelch)
 252         hbox.Add((5,0), 0)
 253         vbox.Add(hbox, 0, wx.EXPAND)
 254
 255         try:
 256             self.knob = powermate.powermate(self.frame)
 257             self.rot = 0
 258             powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
 259             powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
 260         except:
 261             print "FYI: No Powermate or Contour Knob found"
 262
 263
 264     def on_rotate (self, event):
 265         self.rot += event.delta
 266         if (self.state == "FREQ"):
 267             if self.rot >= 3:
 268                 self.set_freq(self.freq + .1e6)
 269                 self.rot -= 3
 270             elif self.rot <=-3:
 271                 self.set_freq(self.freq - .1e6)
 272                 self.rot += 3
 273         else:
 274             step = self.volume_range()[2]
 275             if self.rot >= 3:
 276                 self.set_vol(self.vol + step)
 277                 self.rot -= 3
 278             elif self.rot <=-3:
 279                 self.set_vol(self.vol - step)
 280                 self.rot += 3
 281
 282     def on_button (self, event):
 283         if event.value == 0:        # button up
 284             return
 285         self.rot = 0
 286         if self.state == "FREQ":
 287             self.state = "VOL"
 288         else:
 289             self.state = "FREQ"
 290         self.update_status_bar ()
 291
 292
 293     def set_vol (self, vol):
 294         g = self.volume_range()
 295         self.vol = max(g[0], min(g[1], vol))
 296         self.volume_control_l.set_k(10**(self.vol/10))
 297         self.volume_control_r.set_k(10**(self.vol/10))
 298         self.myform['volume'].set_value(self.vol)
 299         self.update_status_bar ()
 300
 301     def set_squelch(self,squelch_threshold):
 302         try:
 303           self.guts.stereo_carrier_pll_recovery.set_lock_threshold(squelch_threshold);
 304         except:
 305           print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
 306
 307     def set_freq(self, target_freq):
 308         """
 309         Set the center frequency we're interested in.
 310
 311         @param target_freq: frequency in Hz
 312         @rypte: bool
 313
 314         Tuning is a two step process.  First we ask the front-end to
 315         tune as close to the desired frequency as it can.  Then we use
 316         the result of that operation and our target_frequency to
 317         determine the value for the digital down converter.
 318         """
 319         r = usrp.tune(self.u, 0, self.subdev, target_freq)
 320
 321         if r:
 322             self.freq = target_freq
 323             self.myform['freq'].set_value(target_freq)         # update displayed value
 324             self.myform['freq_slider'].set_value(target_freq)  # update displayed value
 325             self.update_status_bar()
 326             self._set_status_msg("OK", 0)
 327             return True
 328
 329         self._set_status_msg("Failed", 0)
 330         return False
 331
 332     def set_gain(self, gain):
 333         self.myform['gain'].set_value(gain)     # update displayed value
 334         self.subdev.set_gain(gain)
 335
 336     def update_status_bar (self):
 337         msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
 338         self._set_status_msg(msg, 1)
 339         self.src_fft.set_baseband_freq(self.freq)
 340
 341     def volume_range(self):
 342         return (-20.0, 0.0, 0.5)
 343
 344
 345 if __name__ == '__main__':
 346     app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")
 347     app.MainLoop ()