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
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,
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)
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")
44 (options, args) = parser.parse_args()
58 self.u = usrp.source_c() # usrp is data source
60 adc_rate = self.u.adc_rate() # 64 MS/s
62 self.u.set_decim_rate(usrp_decim)
63 usrp_rate = adc_rate / usrp_decim # 320 kS/s
65 demod_rate = usrp_rate / chanfilt_decim
67 audio_rate = demod_rate / audio_decimation # 32 kHz
69 if options.rx_subdev_spec is None:
70 options.rx_subdev_spec = pick_subdevice(self.u)
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(),)
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)
86 self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
88 self.volume_control = gr.multiply_const_ff(self.vol)
90 # sound card as final sink
91 audio_sink = audio.sink (int (audio_rate),
95 # now wire it all together
96 self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
98 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
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
105 if options.volume is None:
106 g = self.volume_range()
107 options.volume = float(g[0]+g[1])/2
109 if abs(options.freq) < 1e6:
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")
120 def _set_status_msg(self, msg, which=0):
121 self.frame.GetStatusBar().SetStatusText(msg, which)
124 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
126 def _form_set_freq(kv):
127 return self.set_freq(kv['freq'])
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)
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)
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)
151 # control area form at bottom
152 self.myform = myform = form.form()
154 hbox = wx.BoxSizer(wx.HORIZONTAL)
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))
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)
166 vbox.Add(hbox, 0, wx.EXPAND)
168 hbox = wx.BoxSizer(wx.HORIZONTAL)
172 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
173 weight=3, range=self.volume_range(),
174 callback=self.set_vol)
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)
182 vbox.Add(hbox, 0, wx.EXPAND)
185 self.knob = powermate.powermate(self.frame)
187 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
188 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
190 print "FYI: No Powermate or Contour Knob found"
193 def on_rotate (self, event):
194 self.rot += event.delta
195 if (self.state == "FREQ"):
197 self.set_freq(self.freq + .1e6)
200 self.set_freq(self.freq - .1e6)
203 step = self.volume_range()[2]
205 self.set_vol(self.vol + step)
208 self.set_vol(self.vol - step)
211 def on_button (self, event):
212 if event.value == 0: # button up
215 if self.state == "FREQ":
219 self.update_status_bar ()
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 ()
229 def set_freq(self, target_freq):
231 Set the center frequency we're interested in.
233 @param target_freq: frequency in Hz
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.
241 r = usrp.tune(self.u, 0, self.subdev, target_freq)
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)
251 self._set_status_msg("Failed", 0)
254 def set_gain(self, gain):
255 self.myform['gain'].set_value(gain) # update displayed value
256 self.subdev.set_gain(gain)
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)
263 def volume_range(self):
264 return (-20.0, 0.0, 0.5)
267 if __name__ == '__main__':
268 app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")