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
16 def pick_subdevice(u):
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.
23 return usrp.pick_subdev(u, (usrp_dbid.TV_RX,
24 usrp_dbid.TV_RX_REV_2,
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)
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")
46 (options, args) = parser.parse_args()
60 self.u = usrp.source_c() # usrp is data source
62 adc_rate = self.u.adc_rate() # 64 MS/s
64 self.u.set_decim_rate(usrp_decim)
65 usrp_rate = adc_rate / usrp_decim # 320 kS/s
67 demod_rate = usrp_rate / chanfilt_decim
69 audio_rate = demod_rate / audio_decimation # 32 kHz
71 if options.rx_subdev_spec is None:
72 options.rx_subdev_spec = pick_subdevice(self.u)
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)
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)
88 #self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
89 self.guts = blks.wfm_rcv_pll (self, demod_rate, audio_decimation)
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)
95 # sound card as final sink
96 audio_sink = audio.sink (int (audio_rate),
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))
105 self.guts.stereo_carrier_pll_recovery.squelch_enable(True)
107 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
110 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
112 if options.gain is None:
113 # if no gain was specified, use the mid-point in dB
114 g = self.subdev.gain_range()
115 options.gain = float(g[0]+g[1])/2
117 if options.volume is None:
118 g = self.volume_range()
119 options.volume = float(g[0]+g[1])/2
121 if abs(options.freq) < 1e6:
126 self.set_gain(options.gain)
127 self.set_vol(options.volume)
129 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch)
131 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
133 if not(self.set_freq(options.freq)):
134 self._set_status_msg("Failed to set initial frequency")
137 def _set_status_msg(self, msg, which=0):
138 self.frame.GetStatusBar().SetStatusText(msg, which)
141 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
143 def _form_set_freq(kv):
144 return self.set_freq(kv['freq'])
148 self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
149 fft_size=512, sample_rate=usrp_rate)
150 self.connect (self.u, self.src_fft)
151 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
154 post_fm_demod_fft = fftsink.fft_sink_f (self, self.panel, title="Post FM Demod",
155 fft_size=512, sample_rate=demod_rate,
156 y_per_div=10, ref_level=0)
157 self.connect (self.guts.fm_demod, post_fm_demod_fft)
158 vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
161 post_stereo_carrier_generator_fft = fftsink.fft_sink_c (self, self.panel, title="Post Stereo_carrier_generator",
162 fft_size=512, sample_rate=audio_rate,
163 y_per_div=10, ref_level=0)
164 self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
165 vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
168 post_deemphasis_left = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Left",
169 fft_size=512, sample_rate=audio_rate,
170 y_per_div=10, ref_level=0)
171 self.connect (self.guts.deemph_Left, post_deemphasis_left)
172 vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
175 post_deemphasis_right = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Right",
176 fft_size=512, sample_rate=audio_rate,
177 y_per_div=10, ref_level=-20)
178 self.connect (self.guts.deemph_Left, post_deemphasis_right)
179 vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
183 LmR_fft = fftsink.fft_sink_f (self, self.panel, title="LmR",
184 fft_size=512, sample_rate=audio_rate,
185 y_per_div=10, ref_level=-20)
186 self.connect (self.guts.LmR_real,LmR_fft)
187 vbox.Add (LmR_fft.win, 4, wx.EXPAND)
190 self.scope = scopesink.scope_sink_f(self, self.panel, sample_rate=demod_rate)
191 self.connect (self.guts.fm_demod_a,self.scope)
192 vbox.Add (self.scope.win,4,wx.EXPAND)
194 # control area form at bottom
195 self.myform = myform = form.form()
197 hbox = wx.BoxSizer(wx.HORIZONTAL)
199 myform['freq'] = form.float_field(
200 parent=self.panel, sizer=hbox, label="Freq", weight=1,
201 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
204 myform['freq_slider'] = \
205 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
206 range=(87.9e6, 108.1e6, 0.1e6),
207 callback=self.set_freq)
209 vbox.Add(hbox, 0, wx.EXPAND)
211 hbox = wx.BoxSizer(wx.HORIZONTAL)
215 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
216 weight=3, range=self.volume_range(),
217 callback=self.set_vol)
221 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
222 weight=3, range=self.subdev.gain_range(),
223 callback=self.set_gain)
226 myform['sqlch_thrsh'] = \
227 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
228 weight=3, range=(0.0,1.0,0.01),
229 callback=self.set_squelch)
231 vbox.Add(hbox, 0, wx.EXPAND)
234 self.knob = powermate.powermate(self.frame)
236 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
237 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
239 print "FYI: No Powermate or Contour Knob found"
242 def on_rotate (self, event):
243 self.rot += event.delta
244 if (self.state == "FREQ"):
246 self.set_freq(self.freq + .1e6)
249 self.set_freq(self.freq - .1e6)
252 step = self.volume_range()[2]
254 self.set_vol(self.vol + step)
257 self.set_vol(self.vol - step)
260 def on_button (self, event):
261 if event.value == 0: # button up
264 if self.state == "FREQ":
268 self.update_status_bar ()
271 def set_vol (self, vol):
272 g = self.volume_range()
273 self.vol = max(g[0], min(g[1], vol))
274 self.volume_control_l.set_k(10**(self.vol/10))
275 self.volume_control_r.set_k(10**(self.vol/10))
276 self.myform['volume'].set_value(self.vol)
277 self.update_status_bar ()
279 def set_squelch(self,squelch_threshold):
281 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(squelch_threshold);
283 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
285 def set_freq(self, target_freq):
287 Set the center frequency we're interested in.
289 @param target_freq: frequency in Hz
292 Tuning is a two step process. First we ask the front-end to
293 tune as close to the desired frequency as it can. Then we use
294 the result of that operation and our target_frequency to
295 determine the value for the digital down converter.
297 r = usrp.tune(self.u, 0, self.subdev, target_freq)
300 self.freq = target_freq
301 self.myform['freq'].set_value(target_freq) # update displayed value
302 self.myform['freq_slider'].set_value(target_freq) # update displayed value
303 self.update_status_bar()
304 self._set_status_msg("OK", 0)
307 self._set_status_msg("Failed", 0)
310 def set_gain(self, gain):
311 self.myform['gain'].set_value(gain) # update displayed value
312 self.subdev.set_gain(gain)
314 def update_status_bar (self):
315 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
316 self._set_status_msg(msg, 1)
317 self.src_fft.set_baseband_freq(self.freq)
319 def volume_range(self):
320 return (-20.0, 0.0, 0.5)
323 if __name__ == '__main__':
324 app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")