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 wxapt_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=137.5e6,
36 help="set frequency to FREQ", metavar="FREQ")
37 parser.add_option("-g", "--gain", type="eng_float", default=None,
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 40e3, # passband cutoff
80 60e3, # 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), options.audio_output)
93 # now wire it all together
94 self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
96 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
98 if options.gain is None:
99 # if no gain was specified, use the mid-point in dB
100 g = self.subdev.gain_range()
101 options.gain = float(g[0]+g[1])/2
103 if options.volume is None:
104 g = self.volume_range()
105 options.volume = float(g[0]+g[1])/2
107 if abs(options.freq) < 1e6:
112 self.set_gain(options.gain)
113 self.set_vol(options.volume)
114 if not(self.set_freq(options.freq)):
115 self._set_status_msg("Failed to set initial frequency")
118 def _set_status_msg(self, msg, which=0):
119 self.frame.GetStatusBar().SetStatusText(msg, which)
122 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
124 def _form_set_freq(kv):
125 return self.set_freq(kv['freq'])
129 self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
130 fft_size=512, sample_rate=usrp_rate)
131 self.connect (self.u, self.src_fft)
132 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
135 post_deemph_fft = fftsink.fft_sink_f (self, self.panel, title="Post Deemph",
136 fft_size=512, sample_rate=demod_rate,
137 y_per_div=10, ref_level=-20)
138 self.connect (self.guts.deemph, post_deemph_fft)
139 vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
142 post_filt_fft = fftsink.fft_sink_f (self, self.panel, title="Post Filter",
143 fft_size=512, sample_rate=audio_rate,
144 y_per_div=10, ref_level=0)
145 self.connect (self.guts.audio_filter, post_filt_fft)
146 vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
149 # control area form at bottom
150 self.myform = myform = form.form()
152 hbox = wx.BoxSizer(wx.HORIZONTAL)
154 myform['freq'] = form.float_field(
155 parent=self.panel, sizer=hbox, label="Freq", weight=1,
156 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
159 myform['freq_slider'] = \
160 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
161 range=(137.0e6, 138.0e6, 0.0005e6),
162 callback=self.set_freq)
164 vbox.Add(hbox, 0, wx.EXPAND)
166 hbox = wx.BoxSizer(wx.HORIZONTAL)
170 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
171 weight=3, range=self.volume_range(),
172 callback=self.set_vol)
176 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
177 weight=3, range=self.subdev.gain_range(),
178 callback=self.set_gain)
180 vbox.Add(hbox, 0, wx.EXPAND)
183 self.knob = powermate.powermate(self.frame)
185 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
186 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
188 print "FYI: No Powermate or Contour Knob found"
191 def on_rotate (self, event):
192 self.rot += event.delta
193 if (self.state == "FREQ"):
195 self.set_freq(self.freq + .1e6)
198 self.set_freq(self.freq - .1e6)
201 step = self.volume_range()[2]
203 self.set_vol(self.vol + step)
206 self.set_vol(self.vol - step)
209 def on_button (self, event):
210 if event.value == 0: # button up
213 if self.state == "FREQ":
217 self.update_status_bar ()
220 def set_vol (self, vol):
221 g = self.volume_range()
222 self.vol = max(g[0], min(g[1], vol))
223 self.volume_control.set_k(10**(self.vol/10))
224 self.myform['volume'].set_value(self.vol)
225 self.update_status_bar ()
227 def set_freq(self, target_freq):
229 Set the center frequency we're interested in.
231 @param target_freq: frequency in Hz
234 Tuning is a two step process. First we ask the front-end to
235 tune as close to the desired frequency as it can. Then we use
236 the result of that operation and our target_frequency to
237 determine the value for the digital down converter.
239 r = usrp.tune(self.u, 0, self.subdev, target_freq)
242 self.freq = target_freq
243 self.myform['freq'].set_value(target_freq) # update displayed value
244 self.myform['freq_slider'].set_value(target_freq) # update displayed value
245 self.update_status_bar()
246 self._set_status_msg("OK", 0)
249 self._set_status_msg("Failed", 0)
252 def set_gain(self, gain):
253 self.myform['gain'].set_value(gain) # update displayed value
254 self.subdev.set_gain(gain)
256 def update_status_bar (self):
257 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
258 self._set_status_msg(msg, 1)
259 self.src_fft.set_baseband_freq(self.freq)
261 def volume_range(self):
262 return (-20.0, 0.0, 0.5)
265 if __name__ == '__main__':
266 app = stdgui.stdapp (wxapt_rx_graph, "USRP WXAPT RX")