git.gag.com Git - debian/gnuradio/blob - gnuradio-examples/python/usrp/usrp_wfm_rcv.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
  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
  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=40,
  38                           help="set gain in dB (default is midpoint)")
  39         parser.add_option("-V", "--volume", type="eng_float", default=None,
  40                           help="set volume (default is midpoint)")
  41         parser.add_option("-O", "--audio-output", type="string", default="",
  42                           help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
  43
  44         (options, args) = parser.parse_args()
  45         if len(args) != 0:
  46             parser.print_help()
  47             sys.exit(1)
  48
  49         self.frame = frame
  50         self.panel = panel
  51
  52         self.vol = 0
  53         self.state = "FREQ"
  54         self.freq = 0
  55
  56         # build graph
  57
  58         self.u = usrp.source_c()                    # usrp is data source
  59
  60         adc_rate = self.u.adc_rate()                # 64 MS/s
  61         usrp_decim = 200
  62         self.u.set_decim_rate(usrp_decim)
  63         usrp_rate = adc_rate / usrp_decim           # 320 kS/s
  64         chanfilt_decim = 1
  65         demod_rate = usrp_rate / chanfilt_decim
  66         audio_decimation = 10
  67         audio_rate = demod_rate / audio_decimation  # 32 kHz
  68
  69         if options.rx_subdev_spec is None:
  70             options.rx_subdev_spec = pick_subdevice(self.u)
  71
  72         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
  73         self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
  74         print "Using RX d'board %s" % (self.subdev.side_and_name(),)
  75
  76
  77         chan_filt_coeffs = optfir.low_pass (1,           # gain
  78                                             usrp_rate,   # sampling rate
  79                                             80e3,        # passband cutoff
  80                                             115e3,       # stopband cutoff
  81                                             0.1,         # passband ripple
  82                                             60)          # stopband attenuation
  83         #print len(chan_filt_coeffs)
  84         chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
  85
  86         self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
  87
  88         self.volume_control = gr.multiply_const_ff(self.vol)
  89
  90         # sound card as final sink
  91         audio_sink = audio.sink (int (audio_rate),
  92                                  options.audio_output,
  93                                  False)  # ok_to_block
  94
  95         # now wire it all together
  96         self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
  97
  98         self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
  99
 100         if options.gain is None:
 101             # if no gain was specified, use the mid-point in dB
 102             g = self.subdev.gain_range()
 103             options.gain = float(g[0]+g[1])/2
 104
 105         if options.volume is None:
 106             g = self.volume_range()
 107             options.volume = float(g[0]+g[1])/2
 108
 109         if abs(options.freq) < 1e6:
 110             options.freq *= 1e6
 111
 112         # set initial values
 113
 114         self.set_gain(options.gain)
 115         self.set_vol(options.volume)
 116         if not(self.set_freq(options.freq)):
 117             self._set_status_msg("Failed to set initial frequency")
 118
 119
 120     def _set_status_msg(self, msg, which=0):
 121         self.frame.GetStatusBar().SetStatusText(msg, which)
 122
 123
 124     def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
 125
 126         def _form_set_freq(kv):
 127             return self.set_freq(kv['freq'])
 128
 129
 130         if 1:
 131             self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
 132                                                fft_size=512, sample_rate=usrp_rate)
 133             self.connect (self.u, self.src_fft)
 134             vbox.Add (self.src_fft.win, 4, wx.EXPAND)
 135
 136         if 1:
 137             post_filt_fft = fftsink.fft_sink_f (self, self.panel, title="Post Demod",
 138                                                 fft_size=1024, sample_rate=usrp_rate,
 139                                                 y_per_div=10, ref_level=0)
 140             self.connect (self.guts.fm_demod, post_filt_fft)
 141             vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
 142
 143         if 0:
 144             post_deemph_fft = fftsink.fft_sink_f (self, self.panel, title="Post Deemph",
 145                                                   fft_size=512, sample_rate=audio_rate,
 146                                                   y_per_div=10, ref_level=-20)
 147             self.connect (self.guts.deemph, post_deemph_fft)
 148             vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
 149
 150
 151         # control area form at bottom
 152         self.myform = myform = form.form()
 153
 154         hbox = wx.BoxSizer(wx.HORIZONTAL)
 155         hbox.Add((5,0), 0)
 156         myform['freq'] = form.float_field(
 157             parent=self.panel, sizer=hbox, label="Freq", weight=1,
 158             callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
 159
 160         hbox.Add((5,0), 0)
 161         myform['freq_slider'] = \
 162             form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
 163                                         range=(87.9e6, 108.1e6, 0.1e6),
 164                                         callback=self.set_freq)
 165         hbox.Add((5,0), 0)
 166         vbox.Add(hbox, 0, wx.EXPAND)
 167
 168         hbox = wx.BoxSizer(wx.HORIZONTAL)
 169         hbox.Add((5,0), 0)
 170
 171         myform['volume'] = \
 172             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
 173                                         weight=3, range=self.volume_range(),
 174                                         callback=self.set_vol)
 175         hbox.Add((5,0), 1)
 176
 177         myform['gain'] = \
 178             form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
 179                                         weight=3, range=self.subdev.gain_range(),
 180                                         callback=self.set_gain)
 181         hbox.Add((5,0), 0)
 182         vbox.Add(hbox, 0, wx.EXPAND)
 183
 184         try:
 185             self.knob = powermate.powermate(self.frame)
 186             self.rot = 0
 187             powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
 188             powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
 189         except:
 190             print "FYI: No Powermate or Contour Knob found"
 191
 192
 193     def on_rotate (self, event):
 194         self.rot += event.delta
 195         if (self.state == "FREQ"):
 196             if self.rot >= 3:
 197                 self.set_freq(self.freq + .1e6)
 198                 self.rot -= 3
 199             elif self.rot <=-3:
 200                 self.set_freq(self.freq - .1e6)
 201                 self.rot += 3
 202         else:
 203             step = self.volume_range()[2]
 204             if self.rot >= 3:
 205                 self.set_vol(self.vol + step)
 206                 self.rot -= 3
 207             elif self.rot <=-3:
 208                 self.set_vol(self.vol - step)
 209                 self.rot += 3
 210
 211     def on_button (self, event):
 212         if event.value == 0:        # button up
 213             return
 214         self.rot = 0
 215         if self.state == "FREQ":
 216             self.state = "VOL"
 217         else:
 218             self.state = "FREQ"
 219         self.update_status_bar ()
 220
 221
 222     def set_vol (self, vol):
 223         g = self.volume_range()
 224         self.vol = max(g[0], min(g[1], vol))
 225         self.volume_control.set_k(10**(self.vol/10))
 226         self.myform['volume'].set_value(self.vol)
 227         self.update_status_bar ()
 228
 229     def set_freq(self, target_freq):
 230         """
 231         Set the center frequency we're interested in.
 232
 233         @param target_freq: frequency in Hz
 234         @rypte: bool
 235
 236         Tuning is a two step process.  First we ask the front-end to
 237         tune as close to the desired frequency as it can.  Then we use
 238         the result of that operation and our target_frequency to
 239         determine the value for the digital down converter.
 240         """
 241         r = usrp.tune(self.u, 0, self.subdev, target_freq)
 242
 243         if r:
 244             self.freq = target_freq
 245             self.myform['freq'].set_value(target_freq)         # update displayed value
 246             self.myform['freq_slider'].set_value(target_freq)  # update displayed value
 247             self.update_status_bar()
 248             self._set_status_msg("OK", 0)
 249             return True
 250
 251         self._set_status_msg("Failed", 0)
 252         return False
 253
 254     def set_gain(self, gain):
 255         self.myform['gain'].set_value(gain)     # update displayed value
 256         self.subdev.set_gain(gain)
 257
 258     def update_status_bar (self):
 259         msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
 260         self._set_status_msg(msg, 1)
 261         self.src_fft.set_baseband_freq(self.freq)
 262
 263     def volume_range(self):
 264         return (-20.0, 0.0, 0.5)
 265
 266
 267 if __name__ == '__main__':
 268     app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")
 269     app.MainLoop ()