git.gag.com Git - debian/gnuradio/blob - gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py

   1 #!/usr/bin/env python
   2
   3 from gnuradio import gr, gru, eng_notation, optfir
   4 from gnuradio import audio
   5 from gnuradio import usrp
   6 from gnuradio import blks
   7 from gnuradio.eng_option import eng_option
   8 from gnuradio.wxgui import slider, powermate
   9 from gnuradio.wxgui import stdgui, fftsink, form, scopesink
  10 from optparse import OptionParser
  11 from usrpm import usrp_dbid
  12 import sys
  13 import math
  14 import wx
  15
  16 def pick_subdevice(u):
  17     """
  18     The user didn't specify a subdevice on the command line.
  19     Try for one of these, in order: TV_RX, BASIC_RX, whatever is on side A.
  20
  21     @return a subdev_spec
  22     """
  23     return usrp.pick_subdev(u, (usrp_dbid.TV_RX,
  24                                 usrp_dbid.TV_RX_REV_2,
  25                                 usrp_dbid.TV_RX_REV_3,
  26                                 usrp_dbid.BASIC_RX))
  27
  28 class wfm_rx_graph (stdgui.gui_flow_graph):
  29     def __init__(self,frame,panel,vbox,argv):
  30         stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)
  31
  32         parser=OptionParser(option_class=eng_option)
  33         parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
  34                           help="select USRP Rx side A or B (default=A)")
  35         parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
  36                           help="set frequency to FREQ", metavar="FREQ")
  37         parser.add_option("-g", "--gain", type="eng_float", default=65,
  38                           help="set gain in dB (default is midpoint)")
  39         parser.add_option("-s", "--squelch", type="eng_float", default=0,
  40                           help="set squelch level (default is 0)")
  41         parser.add_option("-V", "--volume", type="eng_float", default=None,
  42                           help="set volume (default is midpoint)")
  43         parser.add_option("-O", "--audio-output", type="string", default="",
  44                           help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
  45
  46
  47         (options, args) = parser.parse_args()
  48         if len(args) != 0:
  49             parser.print_help()
  50             sys.exit(1)
  51
  52         self.frame = frame
  53         self.panel = panel
  54
  55         self.vol = 0
  56         self.state = "FREQ"
  57         self.freq = 0
  58
  59         # build graph
  60
  61         self.u = usrp.source_c()                    # usrp is data source
  62
  63         adc_rate = self.u.adc_rate()                # 64 MS/s
  64         usrp_decim = 200
  65         self.u.set_decim_rate(usrp_decim)
  66         usrp_rate = adc_rate / usrp_decim           # 320 kS/s
  67         chanfilt_decim = 1
  68         demod_rate = usrp_rate / chanfilt_decim
  69         audio_decimation = 10
  70         audio_rate = demod_rate / audio_decimation  # 32 kHz
  71
  72         if options.rx_subdev_spec is None:
  73             options.rx_subdev_spec = pick_subdevice(self.u)
  74
  75         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
  76         self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
  77
  78
  79         chan_filt_coeffs = optfir.low_pass (1,           # gain
  80                                             usrp_rate,   # sampling rate
  81                                             80e3,        # passband cutoff
  82                                             115e3,       # stopband cutoff
  83                                             0.1,         # passband ripple
  84                                             60)          # stopband attenuation
  85         #print len(chan_filt_coeffs)
  86         chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
  87
  88
  89         #self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
  90         self.guts = blks.wfm_rcv_pll (self, demod_rate, audio_decimation)
  91
  92         # FIXME rework {add,multiply}_const_* to handle multiple streams
  93         self.volume_control_l = gr.multiply_const_ff(self.vol)
  94         self.volume_control_r = gr.multiply_const_ff(self.vol)
  95
  96         # sound card as final sink
  97         audio_sink = audio.sink (int (audio_rate),
  98                                  options.audio_output,
  99                                  False)   # ok_to_block
 100
 101         # now wire it all together
 102         self.connect (self.u, chan_filt, self.guts)
 103         self.connect ((self.guts, 0), self.volume_control_l, (audio_sink, 0))
 104         self.connect ((self.guts, 1), self.volume_control_r, (audio_sink, 1))
 105         self.guts.stereo_carrier_pll_recovery.squelch_enable(True);
 106
 107         self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
 108
 109         if options.gain is None:
 110             # if no gain was specified, use the mid-point in dB
 111             g = self.subdev.gain_range()
 112             options.gain = float(g[0]+g[1])/2
 113
 114         if options.volume is None:
 115             g = self.volume_range()
 116             options.volume = float(g[0]+g[1])/2
 117
 118         if abs(options.freq) < 1e6:
 119             options.freq *= 1e6
 120
 121         # set initial values
 122
 123         self.set_gain(options.gain)
 124         self.set_vol(options.volume)
 125         self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch);
 126         if not(self.set_freq(options.freq)):
 127             self._set_status_msg("Failed to set initial frequency")
 128
 129
 130     def _set_status_msg(self, msg, which=0):
 131         self.frame.GetStatusBar().SetStatusText(msg, which)
 132
 133
 134     def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
 135
 136         def _form_set_freq(kv):
 137             return self.set_freq(kv['freq'])
 138
 139
 140         if 1:
 141             self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
 142                                                fft_size=512, sample_rate=usrp_rate)
 143             self.connect (self.u, self.src_fft)
 144             vbox.Add (self.src_fft.win, 4, wx.EXPAND)
 145
 146         if 1:
 147             post_fm_demod_fft = fftsink.fft_sink_f (self, self.panel, title="Post FM Demod",
 148                                                   fft_size=512, sample_rate=demod_rate,
 149                                                   y_per_div=10, ref_level=0)
 150             self.connect (self.guts.fm_demod, post_fm_demod_fft)
 151             vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
 152
 153         if 0:
 154             post_stereo_carrier_generator_fft = fftsink.fft_sink_c (self, self.panel, title="Post Stereo_carrier_generator",
 155                                                   fft_size=512, sample_rate=audio_rate,
 156                                                   y_per_div=10, ref_level=0)
 157             self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
 158             vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
 159
 160         if 0:
 161             post_deemphasis_left = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Left",
 162                                                   fft_size=512, sample_rate=audio_rate,
 163                                                   y_per_div=10, ref_level=0)
 164             self.connect (self.guts.deemph_Left, post_deemphasis_left)
 165             vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
 166
 167         if 0:
 168             post_deemphasis_right = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Right",
 169                                                   fft_size=512, sample_rate=audio_rate,
 170                                                   y_per_div=10, ref_level=-20)
 171             self.connect (self.guts.deemph_Left, post_deemphasis_right)
 172             vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
 173
 174
 175         if 0:
 176             LmR_fft = fftsink.fft_sink_f (self, self.panel, title="LmR",
 177                                                 fft_size=512, sample_rate=audio_rate,
 178                                                 y_per_div=10, ref_level=-20)
 179             self.connect (self.guts.LmR_real,LmR_fft)
 180             vbox.Add (LmR_fft.win, 4, wx.EXPAND)
 181
 182         if 0:
 183             self.scope = scopesink.scope_sink_f(self, self.panel, sample_rate=demod_rate)
 184             self.connect (self.guts.fm_demod_a,self.scope)
 185             vbox.Add (self.scope.win,4,wx.EXPAND)
 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
 219         myform['sqlch_thrsh'] = \
 220             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
 221                                         weight=3, range=(0.0,1.0,0.01),
 222                                         callback=self.guts.stereo_carrier_pll_recovery.set_lock_threshold)
 223         hbox.Add((5,0), 0)
 224         vbox.Add(hbox, 0, wx.EXPAND)
 225
 226         try:
 227             self.knob = powermate.powermate(self.frame)
 228             self.rot = 0
 229             powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
 230             powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
 231         except:
 232             print "FYI: No Powermate or Contour Knob found"
 233
 234
 235     def on_rotate (self, event):
 236         self.rot += event.delta
 237         if (self.state == "FREQ"):
 238             if self.rot >= 3:
 239                 self.set_freq(self.freq + .1e6)
 240                 self.rot -= 3
 241             elif self.rot <=-3:
 242                 self.set_freq(self.freq - .1e6)
 243                 self.rot += 3
 244         else:
 245             step = self.volume_range()[2]
 246             if self.rot >= 3:
 247                 self.set_vol(self.vol + step)
 248                 self.rot -= 3
 249             elif self.rot <=-3:
 250                 self.set_vol(self.vol - step)
 251                 self.rot += 3
 252
 253     def on_button (self, event):
 254         if event.value == 0:        # button up
 255             return
 256         self.rot = 0
 257         if self.state == "FREQ":
 258             self.state = "VOL"
 259         else:
 260             self.state = "FREQ"
 261         self.update_status_bar ()
 262
 263
 264     def set_vol (self, vol):
 265         g = self.volume_range()
 266         self.vol = max(g[0], min(g[1], vol))
 267         self.volume_control_l.set_k(10**(self.vol/10))
 268         self.volume_control_r.set_k(10**(self.vol/10))
 269         self.myform['volume'].set_value(self.vol)
 270         self.update_status_bar ()
 271
 272     def set_freq(self, target_freq):
 273         """
 274         Set the center frequency we're interested in.
 275
 276         @param target_freq: frequency in Hz
 277         @rypte: bool
 278
 279         Tuning is a two step process.  First we ask the front-end to
 280         tune as close to the desired frequency as it can.  Then we use
 281         the result of that operation and our target_frequency to
 282         determine the value for the digital down converter.
 283         """
 284         r = usrp.tune(self.u, 0, self.subdev, target_freq)
 285
 286         if r:
 287             self.freq = target_freq
 288             self.myform['freq'].set_value(target_freq)         # update displayed value
 289             self.myform['freq_slider'].set_value(target_freq)  # update displayed value
 290             self.update_status_bar()
 291             self._set_status_msg("OK", 0)
 292             return True
 293
 294         self._set_status_msg("Failed", 0)
 295         return False
 296
 297     def set_gain(self, gain):
 298         self.myform['gain'].set_value(gain)     # update displayed value
 299         self.subdev.set_gain(gain)
 300
 301     def update_status_bar (self):
 302         msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
 303         self._set_status_msg(msg, 1)
 304         self.src_fft.set_baseband_freq(self.freq)
 305
 306     def volume_range(self):
 307         return (-20.0, 0.0, 0.5)
 308
 309
 310 if __name__ == '__main__':
 311     app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")
 312     app.MainLoop ()