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
17 #////////////////////////////////////////////////////////////////////////
19 #////////////////////////////////////////////////////////////////////////
21 class my_graph (stdgui.gui_flow_graph):
22 def __init__(self,frame,panel,vbox,argv):
23 stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)
25 parser=OptionParser(option_class=eng_option)
26 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
27 help="select USRP Rx side A or B (default=A)")
28 parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
29 help="set frequency to FREQ", metavar="FREQ")
30 parser.add_option("-g", "--gain", type="eng_float", default=None,
31 help="set gain in dB (default is midpoint)")
32 parser.add_option("-V", "--volume", type="eng_float", default=None,
33 help="set volume (default is midpoint)")
34 parser.add_option("-O", "--audio-output", type="string", default="",
35 help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
36 parser.add_option("-N", "--no-gui", action="store_true", default=False)
38 (options, args) = parser.parse_args()
43 if options.freq < 1e6:
53 self.rxpath = receive_path(self, options.rx_subdev_spec, options.gain, options.audio_output)
55 self._build_gui(vbox, options.no_gui)
59 if options.volume is not None:
60 self.set_volume(options.volume)
62 if not(self.set_freq(options.freq)):
63 self._set_status_msg("Failed to set initial frequency")
65 self.set_gain(self.rxpath.gain) # update gui
66 self.set_volume(self.rxpath.volume) # update gui
67 self.set_squelch(self.rxpath.threshold()) # update gui
70 def _set_status_msg(self, msg, which=0):
71 self.frame.GetStatusBar().SetStatusText(msg, which)
74 def _build_gui(self, vbox, no_gui):
76 def _form_set_freq(kv):
77 return self.set_freq(kv['freq'])
82 self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
83 fft_size=512, sample_rate=self.rxpath.if_rate,
84 ref_level=80, y_per_div=20)
85 self.connect (self.rxpath.u, self.src_fft)
86 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
89 rx_fft = fftsink.fft_sink_c (self, self.panel, title="Post s/w DDC",
90 fft_size=512, sample_rate=self.rxpath.quad_rate,
91 ref_level=80, y_per_div=20)
92 self.connect (self.rxpath.ddc, rx_fft)
93 vbox.Add (rx_fft.win, 4, wx.EXPAND)
96 post_deemph_fft = fftsink.fft_sink_f (self, self.panel, title="Post Deemph",
97 fft_size=512, sample_rate=self.rxpath.audio_rate,
98 y_per_div=10, ref_level=-40)
99 self.connect (self.rxpath.fmrx.deemph, post_deemph_fft)
100 vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
103 post_filt_fft = fftsink.fft_sink_f (self, self.panel, title="Post Filter",
104 fft_size=512, sample_rate=audio_rate,
105 y_per_div=10, ref_level=-40)
106 self.connect (self.guts.audio_filter, post_filt)
107 vbox.Add (fft_win4, 4, wx.EXPAND)
110 # control area form at bottom
111 self.myform = myform = form.form()
113 hbox = wx.BoxSizer(wx.HORIZONTAL)
115 myform['freq'] = form.float_field(
116 parent=self.panel, sizer=hbox, label="Freq", weight=1,
117 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
120 #myform['freq_slider'] = \
121 # form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
122 # range=(87.9e6, 108.1e6, 0.1e6),
123 # callback=self.set_freq)
126 vbox.Add(hbox, 0, wx.EXPAND)
128 hbox = wx.BoxSizer(wx.HORIZONTAL)
132 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
133 weight=3, range=self.volume_range(),
134 callback=self.set_volume)
136 myform['squelch'] = \
137 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Squelch",
138 weight=3, range=self.rxpath.squelch_range(),
139 callback=self.set_squelch)
142 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
143 weight=3, range=self.rxpath.subdev.gain_range(),
144 callback=self.set_gain)
146 vbox.Add(hbox, 0, wx.EXPAND)
149 self.knob = powermate.powermate(self.frame)
151 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
152 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
154 print "FYI: No Powermate or Contour Knob found"
157 def on_rotate (self, event):
158 self.rot += event.delta
159 if (self.state == "FREQ"):
161 self.set_freq(self.freq + self.freq_step)
164 self.set_freq(self.freq - self.freq_step)
167 step = self.volume_range()[2]
169 self.set_volume(self.rxpath.volume + step)
172 self.set_volume(self.rxpath.volume - step)
175 def on_button (self, event):
176 if event.value == 0: # button up
179 if self.state == "FREQ":
183 self.update_status_bar ()
186 def set_squelch(self, threshold_in_db):
187 self.rxpath.set_squelch(threshold_in_db)
188 self.myform['squelch'].set_value(self.rxpath.threshold())
190 def set_volume (self, vol):
191 self.rxpath.set_volume(vol)
192 self.myform['volume'].set_value(self.rxpath.volume)
193 self.update_status_bar ()
195 def set_freq(self, target_freq):
196 r = self.rxpath.set_freq(target_freq)
198 self.freq = target_freq
199 self.myform['freq'].set_value(target_freq) # update displayed value
200 #self.myform['freq_slider'].set_value(target_freq) # update displayed value
201 self.update_status_bar()
202 self._set_status_msg("OK", 0)
205 self._set_status_msg("Failed", 0)
208 def set_gain(self, gain):
209 self.myform['gain'].set_value(gain) # update displayed value
210 self.rxpath.set_gain(gain)
212 def update_status_bar (self):
213 msg = "Volume:%r Setting:%s" % (self.rxpath.volume, self.state)
214 self._set_status_msg(msg, 1)
216 self.src_fft.set_baseband_freq(self.freq)
218 def volume_range(self):
219 return (-20.0, 0.0, 0.5)
222 #////////////////////////////////////////////////////////////////////////
224 #////////////////////////////////////////////////////////////////////////
226 USE_SIMPLE_SQUELCH = False
228 class receive_path(gr.hier_block):
229 def __init__(self, fg, subdev_spec, gain, audio_output):
231 self.u = usrp.source_c ()
232 adc_rate = self.u.adc_rate()
234 self.if_rate = 256e3 # 256 kS/s
235 usrp_decim = int(adc_rate // self.if_rate)
237 self.u.set_decim_rate(usrp_decim)
238 self.quad_rate = self.if_rate // if_decim # 64 kS/s
240 self.audio_rate = self.quad_rate // audio_decim # 32 kS/s
243 if subdev_spec is None:
244 subdev_spec = usrp.pick_rx_subdevice(self.u)
245 self.subdev = usrp.selected_subdev(self.u, subdev_spec)
246 print "Using RX d'board %s" % (self.subdev.side_and_name(),)
248 self.u.set_mux(usrp.determine_rx_mux_value(self.u, subdev_spec))
250 # Create filter to get actual channel we want
251 chan_coeffs = gr.firdes.low_pass (1.0, # gain
252 self.if_rate, # sampling rate
253 13e3, # low pass cutoff freq
254 4e3, # width of trans. band
255 gr.firdes.WIN_HANN) # filter type
257 print "len(rx_chan_coeffs) =", len(chan_coeffs)
259 # Decimating Channel filter with frequency translation
260 # complex in and out, float taps
261 self.ddc = gr.freq_xlating_fir_filter_ccf(if_decim, # decimation rate
263 0, # frequency translation amount
264 self.if_rate) # input sample rate
266 if USE_SIMPLE_SQUELCH:
267 self.squelch = gr.simple_squelch_cc(20)
269 self.squelch = blks.standard_squelch(fg, self.audio_rate)
271 # instantiate the guts of the single channel receiver
272 self.fmrx = blks.nbfm_rx(fg, self.audio_rate, self.quad_rate)
274 # audio gain / mute block
275 self._audio_gain = gr.multiply_const_ff(1.0)
277 # sound card as final sink
278 audio_sink = audio.sink (int(self.audio_rate), audio_output)
280 # now wire it all together
281 if USE_SIMPLE_SQUELCH:
282 fg.connect (self.u, self.ddc, self.squelch, self.fmrx,
283 self._audio_gain, audio_sink)
285 fg.connect (self.u, self.ddc, self.fmrx, self.squelch,
286 self._audio_gain, audio_sink)
288 gr.hier_block.__init__(self, fg, self.u, audio_sink)
291 # if no gain was specified, use the mid-point in dB
292 g = self.subdev.gain_range()
293 gain = float(g[0]+g[1])/2
297 v = self.volume_range()
298 self.set_volume((v[0]+v[1])/2)
299 s = self.squelch_range()
300 self.set_squelch((s[0]+s[1])/2)
302 def volume_range(self):
303 return (-20.0, 0.0, 0.5)
305 def set_volume (self, vol):
306 g = self.volume_range()
307 self.volume = max(g[0], min(g[1], vol))
308 self._update_audio_gain()
310 def _update_audio_gain(self):
311 self._audio_gain.set_k(10**(self.volume/10))
313 def squelch_range(self):
314 r = self.squelch.squelch_range()
315 #print "squelch_range: ", r
318 def set_squelch(self, threshold):
319 #print "SQL =", threshold
320 self.squelch.set_threshold(threshold)
323 t = self.squelch.threshold()
327 def set_freq(self, target_freq):
329 Set the center frequency we're interested in.
331 @param target_freq: frequency in Hz
334 Tuning is a two step process. First we ask the front-end to
335 tune as close to the desired frequency as it can. Then we use
336 the result of that operation and our target_frequency to
337 determine the value for the digital down converter in the
338 FPGA. Finally, we feed any residual_freq to the s/w freq
342 r = usrp.tune(self.u, 0, self.subdev, target_freq)
344 # Use residual_freq in s/w freq translater
345 # print "residual_freq =", r.residual_freq
346 self.ddc.set_center_freq(-r.residual_freq)
351 def set_gain(self, gain):
353 self.subdev.set_gain(gain)
356 # ////////////////////////////////////////////////////////////////////////
358 # ////////////////////////////////////////////////////////////////////////
360 if __name__ == '__main__':
361 app = stdgui.stdapp (my_graph, "USRP NBFM RX")