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   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2005,2006,2007,2009 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
  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.TV_RX_MIMO,
  47                                 usrp_dbid.TV_RX_REV_2_MIMO,
  48                                 usrp_dbid.TV_RX_REV_3_MIMO,
  49                                 usrp_dbid.BASIC_RX))
  50
  51
  52 class wfm_rx_block (stdgui2.std_top_block):
  53     def __init__(self,frame,panel,vbox,argv):
  54         stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
  55
  56         parser=OptionParser(option_class=eng_option)
  57         parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
  58                           help="select USRP Rx side A or B (default=A)")
  59         parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
  60                           help="set frequency to FREQ", metavar="FREQ")
  61         parser.add_option("-g", "--gain", type="eng_float", default=40,
  62                           help="set gain in dB (default is midpoint)")
  63         parser.add_option("-V", "--volume", type="eng_float", default=None,
  64                           help="set volume (default is midpoint)")
  65         parser.add_option("-O", "--audio-output", type="string", default="",
  66                           help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
  67
  68         (options, args) = parser.parse_args()
  69         if len(args) != 0:
  70             parser.print_help()
  71             sys.exit(1)
  72
  73         self.frame = frame
  74         self.panel = panel
  75
  76         self.vol = 0
  77         self.state = "FREQ"
  78         self.freq = 0
  79
  80         # build graph
  81
  82         self.u = usrp.source_c()                    # usrp is data source
  83
  84         adc_rate = self.u.adc_rate()                # 64 MS/s
  85         usrp_decim = 200
  86         self.u.set_decim_rate(usrp_decim)
  87         usrp_rate = adc_rate / usrp_decim           # 320 kS/s
  88         chanfilt_decim = 1
  89         demod_rate = usrp_rate / chanfilt_decim
  90         audio_decimation = 10
  91         audio_rate = demod_rate / audio_decimation  # 32 kHz
  92
  93         if options.rx_subdev_spec is None:
  94             options.rx_subdev_spec = pick_subdevice(self.u)
  95
  96         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
  97         self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
  98         print "Using RX d'board %s" % (self.subdev.side_and_name(),)
  99         dbid = self.subdev.dbid()
 100         if not (dbid == usrp_dbid.BASIC_RX or
 101                 dbid == usrp_dbid.TV_RX or
 102                 dbid == usrp_dbid.TV_RX_REV_2 or
 103                 dbid == usrp_dbid.TV_RX_REV_3 or
 104                 dbid == usrp_dbid.TV_RX_MIMO or
 105                 dbid == usrp_dbid.TV_RX_REV_2_MIMO or
 106                 dbid == usrp_dbid.TV_RX_REV_3_MIMO
 107 ):
 108             print "This daughterboard does not cover the required frequency range"
 109             print "for this application.  Please use a BasicRX or TVRX daughterboard."
 110             raw_input("Press ENTER to continue anyway, or Ctrl-C to exit.")
 111
 112         chan_filt_coeffs = optfir.low_pass (1,           # gain
 113                                             usrp_rate,   # sampling rate
 114                                             80e3,        # passband cutoff
 115                                             115e3,       # stopband cutoff
 116                                             0.1,         # passband ripple
 117                                             60)          # stopband attenuation
 118         #print len(chan_filt_coeffs)
 119         chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
 120
 121         self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
 122
 123         self.volume_control = gr.multiply_const_ff(self.vol)
 124
 125         # sound card as final sink
 126         audio_sink = audio.sink (int (audio_rate),
 127                                  options.audio_output,
 128                                  False)  # ok_to_block
 129
 130         # now wire it all together
 131         self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
 132
 133         self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
 134
 135         if options.gain is None:
 136             # if no gain was specified, use the mid-point in dB
 137             g = self.subdev.gain_range()
 138             options.gain = float(g[0]+g[1])/2
 139
 140         if options.volume is None:
 141             g = self.volume_range()
 142             options.volume = float(g[0]+g[1])/2
 143
 144         if abs(options.freq) < 1e6:
 145             options.freq *= 1e6
 146
 147         # set initial values
 148
 149         self.set_gain(options.gain)
 150         self.set_vol(options.volume)
 151         if not(self.set_freq(options.freq)):
 152             self._set_status_msg("Failed to set initial frequency")
 153
 154
 155     def _set_status_msg(self, msg, which=0):
 156         self.frame.GetStatusBar().SetStatusText(msg, which)
 157
 158
 159     def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
 160
 161         def _form_set_freq(kv):
 162             return self.set_freq(kv['freq'])
 163
 164
 165         if 1:
 166             self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
 167                                                fft_size=512, sample_rate=usrp_rate,
 168                                                ref_scale=32768.0, ref_level=0, y_divs=12)
 169             self.connect (self.u, self.src_fft)
 170             vbox.Add (self.src_fft.win, 4, wx.EXPAND)
 171
 172         if 1:
 173             post_filt_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
 174                                                 fft_size=1024, sample_rate=usrp_rate,
 175                                                 y_per_div=10, ref_level=0)
 176             self.connect (self.guts.fm_demod, post_filt_fft)
 177             vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
 178
 179         if 0:
 180             post_deemph_fft = fftsink2.fft_sink_f(self.panel, title="Post Deemph",
 181                                                   fft_size=512, sample_rate=audio_rate,
 182                                                   y_per_div=10, ref_level=-20)
 183             self.connect (self.guts.deemph, post_deemph_fft)
 184             vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
 185
 186
 187         # control area form at bottom
 188         self.myform = myform = form.form()
 189
 190         hbox = wx.BoxSizer(wx.HORIZONTAL)
 191         hbox.Add((5,0), 0)
 192         myform['freq'] = form.float_field(
 193             parent=self.panel, sizer=hbox, label="Freq", weight=1,
 194             callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
 195
 196         hbox.Add((5,0), 0)
 197         myform['freq_slider'] = \
 198             form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
 199                                         range=(87.9e6, 108.1e6, 0.1e6),
 200                                         callback=self.set_freq)
 201         hbox.Add((5,0), 0)
 202         vbox.Add(hbox, 0, wx.EXPAND)
 203
 204         hbox = wx.BoxSizer(wx.HORIZONTAL)
 205         hbox.Add((5,0), 0)
 206
 207         myform['volume'] = \
 208             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
 209                                         weight=3, range=self.volume_range(),
 210                                         callback=self.set_vol)
 211         hbox.Add((5,0), 1)
 212
 213         myform['gain'] = \
 214             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
 215                                         weight=3, range=self.subdev.gain_range(),
 216                                         callback=self.set_gain)
 217         hbox.Add((5,0), 0)
 218         vbox.Add(hbox, 0, wx.EXPAND)
 219
 220         try:
 221             self.knob = powermate.powermate(self.frame)
 222             self.rot = 0
 223             powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
 224             powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
 225         except:
 226             print "FYI: No Powermate or Contour Knob found"
 227
 228
 229     def on_rotate (self, event):
 230         self.rot += event.delta
 231         if (self.state == "FREQ"):
 232             if self.rot >= 3:
 233                 self.set_freq(self.freq + .1e6)
 234                 self.rot -= 3
 235             elif self.rot <=-3:
 236                 self.set_freq(self.freq - .1e6)
 237                 self.rot += 3
 238         else:
 239             step = self.volume_range()[2]
 240             if self.rot >= 3:
 241                 self.set_vol(self.vol + step)
 242                 self.rot -= 3
 243             elif self.rot <=-3:
 244                 self.set_vol(self.vol - step)
 245                 self.rot += 3
 246
 247     def on_button (self, event):
 248         if event.value == 0:        # button up
 249             return
 250         self.rot = 0
 251         if self.state == "FREQ":
 252             self.state = "VOL"
 253         else:
 254             self.state = "FREQ"
 255         self.update_status_bar ()
 256
 257
 258     def set_vol (self, vol):
 259         g = self.volume_range()
 260         self.vol = max(g[0], min(g[1], vol))
 261         self.volume_control.set_k(10**(self.vol/10))
 262         self.myform['volume'].set_value(self.vol)
 263         self.update_status_bar ()
 264
 265     def set_freq(self, target_freq):
 266         """
 267         Set the center frequency we're interested in.
 268
 269         @param target_freq: frequency in Hz
 270         @rypte: bool
 271
 272         Tuning is a two step process.  First we ask the front-end to
 273         tune as close to the desired frequency as it can.  Then we use
 274         the result of that operation and our target_frequency to
 275         determine the value for the digital down converter.
 276         """
 277         r = usrp.tune(self.u, 0, self.subdev, target_freq)
 278
 279         if r:
 280             self.freq = target_freq
 281             self.myform['freq'].set_value(target_freq)         # update displayed value
 282             self.myform['freq_slider'].set_value(target_freq)  # update displayed value
 283             self.update_status_bar()
 284             self._set_status_msg("OK", 0)
 285             return True
 286
 287         self._set_status_msg("Failed", 0)
 288         return False
 289
 290     def set_gain(self, gain):
 291         self.myform['gain'].set_value(gain)     # update displayed value
 292         self.subdev.set_gain(gain)
 293
 294     def update_status_bar (self):
 295         msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
 296         self._set_status_msg(msg, 1)
 297         self.src_fft.set_baseband_freq(self.freq)
 298
 299     def volume_range(self):
 300         return (-20.0, 0.0, 0.5)
 301
 302
 303 if __name__ == '__main__':
 304     app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")
 305     app.MainLoop ()