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))
104 self.guts.stereo_carrier_pll_recovery.squelch_enable(True);
106 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
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
113 if options.volume is None:
114 g = self.volume_range()
115 options.volume = float(g[0]+g[1])/2
117 if abs(options.freq) < 1e6:
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")
129 def _set_status_msg(self, msg, which=0):
130 self.frame.GetStatusBar().SetStatusText(msg, which)
133 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
135 def _form_set_freq(kv):
136 return self.set_freq(kv['freq'])
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)
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)
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)
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)
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)
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)
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)
186 # control area form at bottom
187 self.myform = myform = form.form()
189 hbox = wx.BoxSizer(wx.HORIZONTAL)
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))
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)
201 vbox.Add(hbox, 0, wx.EXPAND)
203 hbox = wx.BoxSizer(wx.HORIZONTAL)
207 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
208 weight=3, range=self.volume_range(),
209 callback=self.set_vol)
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)
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)
223 vbox.Add(hbox, 0, wx.EXPAND)
226 self.knob = powermate.powermate(self.frame)
228 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
229 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
231 print "FYI: No Powermate or Contour Knob found"
234 def on_rotate (self, event):
235 self.rot += event.delta
236 if (self.state == "FREQ"):
238 self.set_freq(self.freq + .1e6)
241 self.set_freq(self.freq - .1e6)
244 step = self.volume_range()[2]
246 self.set_vol(self.vol + step)
249 self.set_vol(self.vol - step)
252 def on_button (self, event):
253 if event.value == 0: # button up
256 if self.state == "FREQ":
260 self.update_status_bar ()
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 ()
271 def set_freq(self, target_freq):
273 Set the center frequency we're interested in.
275 @param target_freq: frequency in Hz
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.
283 r = usrp.tune(self.u, 0, self.subdev, target_freq)
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)
293 self._set_status_msg("Failed", 0)
296 def set_gain(self, gain):
297 self.myform['gain'].set_value(gain) # update displayed value
298 self.subdev.set_gain(gain)
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)
305 def volume_range(self):
306 return (-20.0, 0.0, 0.5)
309 if __name__ == '__main__':
310 app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")