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 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.BASIC_RX))
  26
  27 class wfm_rx_graph (stdgui.gui_flow_graph):
  28     def __init__(self,frame,panel,vbox,argv):
  29         stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)
  30
  31         parser=OptionParser(option_class=eng_option)
  32         parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
  33                           help="select USRP Rx side A or B (default=A)")
  34         parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
  35                           help="set frequency to FREQ", metavar="FREQ")
  36         parser.add_option("-g", "--gain", type="eng_float", default=65,
  37                           help="set gain in dB (default is midpoint)")
  38         parser.add_option("-s", "--squelch", type="eng_float", default=0,
  39                           help="set squelch level (default is 0)")
  40         parser.add_option("-V", "--volume", type="eng_float", default=None,
  41                           help="set volume (default is midpoint)")
  42         parser.add_option("-O", "--audio-output", type="string", default="",
  43                           help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
  44
  45
  46         (options, args) = parser.parse_args()
  47         if len(args) != 0:
  48             parser.print_help()
  49             sys.exit(1)
  50
  51         self.frame = frame
  52         self.panel = panel
  53
  54         self.vol = 0
  55         self.state = "FREQ"
  56         self.freq = 0
  57
  58         # build graph
  59
  60         self.u = usrp.source_c()                    # usrp is data source
  61
  62         adc_rate = self.u.adc_rate()                # 64 MS/s
  63         usrp_decim = 200
  64         self.u.set_decim_rate(usrp_decim)
  65         usrp_rate = adc_rate / usrp_decim           # 320 kS/s
  66         chanfilt_decim = 1
  67         demod_rate = usrp_rate / chanfilt_decim
  68         audio_decimation = 10
  69         audio_rate = demod_rate / audio_decimation  # 32 kHz
  70
  71         if options.rx_subdev_spec is None:
  72             options.rx_subdev_spec = pick_subdevice(self.u)
  73
  74         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
  75         self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
  76
  77
  78         chan_filt_coeffs = optfir.low_pass (1,           # gain
  79                                             usrp_rate,   # sampling rate
  80                                             80e3,        # passband cutoff
  81                                             115e3,       # stopband cutoff
  82                                             0.1,         # passband ripple
  83                                             60)          # stopband attenuation
  84         #print len(chan_filt_coeffs)
  85         chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
  86
  87
  88         #self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
  89         self.guts = blks.wfm_rcv_pll (self, demod_rate, audio_decimation)
  90
  91         # FIXME rework {add,multiply}_const_* to handle multiple streams
  92         self.volume_control_l = gr.multiply_const_ff(self.vol)
  93         self.volume_control_r = gr.multiply_const_ff(self.vol)
  94
  95         # sound card as final sink
  96         audio_sink = audio.sink (int (audio_rate),
  97                                  options.audio_output,
  98                                  False)   # ok_to_block
  99
 100         # now wire it all together
 101         self.connect (self.u, chan_filt, self.guts)
 102         self.connect ((self.guts, 0), self.volume_control_l, (audio_sink, 0))
 103         self.connect ((self.guts, 1), self.volume_control_r, (audio_sink, 1))
 104         self.guts.stereo_carrier_pll_recovery.squelch_enable(True);
 105
 106         self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
 107
 108         if options.gain is None:
 109             # if no gain was specified, use the mid-point in dB
 110             g = self.subdev.gain_range()
 111             options.gain = float(g[0]+g[1])/2
 112
 113         if options.volume is None:
 114             g = self.volume_range()
 115             options.volume = float(g[0]+g[1])/2
 116
 117         if abs(options.freq) < 1e6:
 118             options.freq *= 1e6
 119
 120         # set initial values
 121
 122         self.set_gain(options.gain)
 123         self.set_vol(options.volume)
 124         self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch);
 125         if not(self.set_freq(options.freq)):
 126             self._set_status_msg("Failed to set initial frequency")
 127
 128
 129     def _set_status_msg(self, msg, which=0):
 130         self.frame.GetStatusBar().SetStatusText(msg, which)
 131
 132
 133     def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
 134
 135         def _form_set_freq(kv):
 136             return self.set_freq(kv['freq'])
 137
 138
 139         if 1:
 140             self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
 141                                                fft_size=512, sample_rate=usrp_rate)
 142             self.connect (self.u, self.src_fft)
 143             vbox.Add (self.src_fft.win, 4, wx.EXPAND)
 144
 145         if 1:
 146             post_fm_demod_fft = fftsink.fft_sink_f (self, self.panel, title="Post FM Demod",
 147                                                   fft_size=512, sample_rate=demod_rate,
 148                                                   y_per_div=10, ref_level=0)
 149             self.connect (self.guts.fm_demod, post_fm_demod_fft)
 150             vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
 151
 152         if 0:
 153             post_stereo_carrier_generator_fft = fftsink.fft_sink_c (self, self.panel, title="Post Stereo_carrier_generator",
 154                                                   fft_size=512, sample_rate=audio_rate,
 155                                                   y_per_div=10, ref_level=0)
 156             self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
 157             vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
 158
 159         if 0:
 160             post_deemphasis_left = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Left",
 161                                                   fft_size=512, sample_rate=audio_rate,
 162                                                   y_per_div=10, ref_level=0)
 163             self.connect (self.guts.deemph_Left, post_deemphasis_left)
 164             vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
 165
 166         if 0:
 167             post_deemphasis_right = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Right",
 168                                                   fft_size=512, sample_rate=audio_rate,
 169                                                   y_per_div=10, ref_level=-20)
 170             self.connect (self.guts.deemph_Left, post_deemphasis_right)
 171             vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
 172
 173
 174         if 0:
 175             LmR_fft = fftsink.fft_sink_f (self, self.panel, title="LmR",
 176                                                 fft_size=512, sample_rate=audio_rate,
 177                                                 y_per_div=10, ref_level=-20)
 178             self.connect (self.guts.LmR_real,LmR_fft)
 179             vbox.Add (LmR_fft.win, 4, wx.EXPAND)
 180
 181         if 0:
 182             self.scope = scopesink.scope_sink_f(self, self.panel, sample_rate=demod_rate)
 183             self.connect (self.guts.fm_demod_a,self.scope)
 184             vbox.Add (self.scope.win,4,wx.EXPAND)
 185
 186         # control area form at bottom
 187         self.myform = myform = form.form()
 188
 189         hbox = wx.BoxSizer(wx.HORIZONTAL)
 190         hbox.Add((5,0), 0)
 191         myform['freq'] = form.float_field(
 192             parent=self.panel, sizer=hbox, label="Freq", weight=1,
 193             callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
 194
 195         hbox.Add((5,0), 0)
 196         myform['freq_slider'] = \
 197             form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
 198                                         range=(87.9e6, 108.1e6, 0.1e6),
 199                                         callback=self.set_freq)
 200         hbox.Add((5,0), 0)
 201         vbox.Add(hbox, 0, wx.EXPAND)
 202
 203         hbox = wx.BoxSizer(wx.HORIZONTAL)
 204         hbox.Add((5,0), 0)
 205
 206         myform['volume'] = \
 207             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
 208                                         weight=3, range=self.volume_range(),
 209                                         callback=self.set_vol)
 210         hbox.Add((5,0), 1)
 211
 212         myform['gain'] = \
 213             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
 214                                         weight=3, range=self.subdev.gain_range(),
 215                                         callback=self.set_gain)
 216         hbox.Add((5,0), 0)
 217
 218         myform['sqlch_thrsh'] = \
 219             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
 220                                         weight=3, range=(0.0,1.0,0.01),
 221                                         callback=self.guts.stereo_carrier_pll_recovery.set_lock_threshold)
 222         hbox.Add((5,0), 0)
 223         vbox.Add(hbox, 0, wx.EXPAND)
 224
 225         try:
 226             self.knob = powermate.powermate(self.frame)
 227             self.rot = 0
 228             powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
 229             powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
 230         except:
 231             print "FYI: No Powermate or Contour Knob found"
 232
 233
 234     def on_rotate (self, event):
 235         self.rot += event.delta
 236         if (self.state == "FREQ"):
 237             if self.rot >= 3:
 238                 self.set_freq(self.freq + .1e6)
 239                 self.rot -= 3
 240             elif self.rot <=-3:
 241                 self.set_freq(self.freq - .1e6)
 242                 self.rot += 3
 243         else:
 244             step = self.volume_range()[2]
 245             if self.rot >= 3:
 246                 self.set_vol(self.vol + step)
 247                 self.rot -= 3
 248             elif self.rot <=-3:
 249                 self.set_vol(self.vol - step)
 250                 self.rot += 3
 251
 252     def on_button (self, event):
 253         if event.value == 0:        # button up
 254             return
 255         self.rot = 0
 256         if self.state == "FREQ":
 257             self.state = "VOL"
 258         else:
 259             self.state = "FREQ"
 260         self.update_status_bar ()
 261
 262
 263     def set_vol (self, vol):
 264         g = self.volume_range()
 265         self.vol = max(g[0], min(g[1], vol))
 266         self.volume_control_l.set_k(10**(self.vol/10))
 267         self.volume_control_r.set_k(10**(self.vol/10))
 268         self.myform['volume'].set_value(self.vol)
 269         self.update_status_bar ()
 270
 271     def set_freq(self, target_freq):
 272         """
 273         Set the center frequency we're interested in.
 274
 275         @param target_freq: frequency in Hz
 276         @rypte: bool
 277
 278         Tuning is a two step process.  First we ask the front-end to
 279         tune as close to the desired frequency as it can.  Then we use
 280         the result of that operation and our target_frequency to
 281         determine the value for the digital down converter.
 282         """
 283         r = usrp.tune(self.u, 0, self.subdev, target_freq)
 284
 285         if r:
 286             self.freq = target_freq
 287             self.myform['freq'].set_value(target_freq)         # update displayed value
 288             self.myform['freq_slider'].set_value(target_freq)  # update displayed value
 289             self.update_status_bar()
 290             self._set_status_msg("OK", 0)
 291             return True
 292
 293         self._set_status_msg("Failed", 0)
 294         return False
 295
 296     def set_gain(self, gain):
 297         self.myform['gain'].set_value(gain)     # update displayed value
 298         self.subdev.set_gain(gain)
 299
 300     def update_status_bar (self):
 301         msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
 302         self._set_status_msg(msg, 1)
 303         self.src_fft.set_baseband_freq(self.freq)
 304
 305     def volume_range(self):
 306         return (-20.0, 0.0, 0.5)
 307
 308
 309 if __name__ == '__main__':
 310     app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")
 311     app.MainLoop ()