3 # Copyright 2005,2006,2007 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, gru, eng_notation, optfir
24 from gnuradio import audio
25 from gnuradio import usrp
26 from gnuradio import blks2
27 from gnuradio.eng_option import eng_option
28 from gnuradio.wxgui import slider, powermate
29 from gnuradio.wxgui import stdgui2, fftsink2, form, scopesink2
30 from optparse import OptionParser
31 from usrpm import usrp_dbid
36 def pick_subdevice(u):
38 The user didn't specify a subdevice on the command line.
39 Try for one of these, in order: TV_RX, BASIC_RX, whatever is on side A.
43 return usrp.pick_subdev(u, (usrp_dbid.TV_RX,
44 usrp_dbid.TV_RX_REV_2,
45 usrp_dbid.TV_RX_REV_3,
48 class wfm_rx_block (stdgui2.std_top_block):
49 def __init__(self,frame,panel,vbox,argv):
50 stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
52 parser=OptionParser(option_class=eng_option)
53 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
54 help="select USRP Rx side A or B (default=A)")
55 parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
56 help="set frequency to FREQ", metavar="FREQ")
57 parser.add_option("-g", "--gain", type="eng_float", default=65,
58 help="set gain in dB (default is midpoint)")
59 parser.add_option("-s", "--squelch", type="eng_float", default=0,
60 help="set squelch level (default is 0)")
61 parser.add_option("-V", "--volume", type="eng_float", default=None,
62 help="set volume (default is midpoint)")
63 parser.add_option("-O", "--audio-output", type="string", default="",
64 help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
67 (options, args) = parser.parse_args()
81 self.u = usrp.source_c() # usrp is data source
83 adc_rate = self.u.adc_rate() # 64 MS/s
85 self.u.set_decim_rate(usrp_decim)
86 usrp_rate = adc_rate / usrp_decim # 320 kS/s
88 demod_rate = usrp_rate / chanfilt_decim
90 audio_rate = 3*demod_rate / audio_decimation/2 # 48 kHz
92 if options.rx_subdev_spec is None:
93 options.rx_subdev_spec = pick_subdevice(self.u)
95 self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
96 self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
99 chan_filt_coeffs = gr.firdes.low_pass_2 (1, # gain
100 usrp_rate, # sampling rate
101 90e3, # passband cutoff
102 30e3, # transition bandwidth
103 70, # stopband attenuation
104 gr.firdes.WIN_BLACKMAN)
105 print len(chan_filt_coeffs)
106 chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
108 self.rchan_sample = blks2.rational_resampler_fff(3,2)
109 self.lchan_sample = blks2.rational_resampler_fff(3,2)
112 #self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
113 self.guts = blks2.wfm_rcv_pll (demod_rate, audio_decimation)
115 # FIXME rework {add,multiply}_const_* to handle multiple streams
116 self.volume_control_l = gr.multiply_const_ff(self.vol)
117 self.volume_control_r = gr.multiply_const_ff(self.vol)
119 # sound card as final sink
120 audio_sink = audio.sink (int (audio_rate),
121 options.audio_output,
124 # now wire it all together
125 self.connect (self.u, chan_filt, self.guts)
126 self.connect((self.guts, 0), self.lchan_sample,self.volume_control_l,(audio_sink,0))
127 self.connect((self.guts, 1), self.rchan_sample,self.volume_control_r,(audio_sink,1))
130 self.guts.stereo_carrier_pll_recovery.squelch_enable(True)
132 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
135 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
137 if options.gain is None:
138 # if no gain was specified, use the mid-point in dB
139 g = self.subdev.gain_range()
140 options.gain = float(g[0]+g[1])/2
142 if options.volume is None:
143 g = self.volume_range()
144 options.volume = float(g[0]+g[1])/2
146 if abs(options.freq) < 1e6:
151 self.set_gain(options.gain)
152 self.set_vol(options.volume)
154 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch)
156 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
158 if not(self.set_freq(options.freq)):
159 self._set_status_msg("Failed to set initial frequency")
162 def _set_status_msg(self, msg, which=0):
163 self.frame.GetStatusBar().SetStatusText(msg, which)
166 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
168 def _form_set_freq(kv):
169 return self.set_freq(kv['freq'])
173 self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
174 fft_size=512, sample_rate=usrp_rate,
175 ref_scale=32768.0, ref_level=0, y_divs=12)
176 self.connect (self.u, self.src_fft)
177 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
180 post_fm_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post FM Demod",
181 fft_size=512, sample_rate=demod_rate,
182 y_per_div=10, ref_level=0)
183 self.connect (self.guts.fm_demod, post_fm_demod_fft)
184 vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
187 post_stereo_carrier_generator_fft = fftsink2.fft_sink_c (self.panel, title="Post Stereo_carrier_generator",
188 fft_size=512, sample_rate=audio_rate,
189 y_per_div=10, ref_level=0)
190 self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
191 vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
194 post_deemphasis_left = fftsink2.fft_sink_f (self.panel, title="Post_Deemphasis_Left",
195 fft_size=512, sample_rate=audio_rate,
196 y_per_div=10, ref_level=0)
197 self.connect (self.guts.deemph_Left, post_deemphasis_left)
198 vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
201 post_deemphasis_right = fftsink2.fft_sink_f(self.panel, title="Post_Deemphasis_Right",
202 fft_size=512, sample_rate=audio_rate,
203 y_per_div=10, ref_level=-20)
204 self.connect (self.guts.deemph_Left, post_deemphasis_right)
205 vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
209 LmR_fft = fftsink2.fft_sink_f(self.panel, title="LmR",
210 fft_size=512, sample_rate=audio_rate,
211 y_per_div=10, ref_level=-20)
212 self.connect (self.guts.LmR_real,LmR_fft)
213 vbox.Add (LmR_fft.win, 4, wx.EXPAND)
216 self.scope = scopesink2.scope_sink_f(self.panel, sample_rate=demod_rate)
217 self.connect (self.guts.fm_demod,self.scope)
218 vbox.Add (self.scope.win,4,wx.EXPAND)
220 # control area form at bottom
221 self.myform = myform = form.form()
223 hbox = wx.BoxSizer(wx.HORIZONTAL)
225 myform['freq'] = form.float_field(
226 parent=self.panel, sizer=hbox, label="Freq", weight=1,
227 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
230 myform['freq_slider'] = \
231 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
232 range=(87.9e6, 108.1e6, 0.1e6),
233 callback=self.set_freq)
235 vbox.Add(hbox, 0, wx.EXPAND)
237 hbox = wx.BoxSizer(wx.HORIZONTAL)
241 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
242 weight=3, range=self.volume_range(),
243 callback=self.set_vol)
247 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
248 weight=3, range=self.subdev.gain_range(),
249 callback=self.set_gain)
252 myform['sqlch_thrsh'] = \
253 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
254 weight=3, range=(0.0,1.0,0.01),
255 callback=self.set_squelch)
257 vbox.Add(hbox, 0, wx.EXPAND)
260 self.knob = powermate.powermate(self.frame)
262 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
263 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
265 print "FYI: No Powermate or Contour Knob found"
268 def on_rotate (self, event):
269 self.rot += event.delta
270 if (self.state == "FREQ"):
272 self.set_freq(self.freq + .1e6)
275 self.set_freq(self.freq - .1e6)
278 step = self.volume_range()[2]
280 self.set_vol(self.vol + step)
283 self.set_vol(self.vol - step)
286 def on_button (self, event):
287 if event.value == 0: # button up
290 if self.state == "FREQ":
294 self.update_status_bar ()
297 def set_vol (self, vol):
298 g = self.volume_range()
299 self.vol = max(g[0], min(g[1], vol))
300 self.volume_control_l.set_k(10**(self.vol/10))
301 self.volume_control_r.set_k(10**(self.vol/10))
302 self.myform['volume'].set_value(self.vol)
303 self.update_status_bar ()
305 def set_squelch(self,squelch_threshold):
307 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(squelch_threshold);
309 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
311 def set_freq(self, target_freq):
313 Set the center frequency we're interested in.
315 @param target_freq: frequency in Hz
318 Tuning is a two step process. First we ask the front-end to
319 tune as close to the desired frequency as it can. Then we use
320 the result of that operation and our target_frequency to
321 determine the value for the digital down converter.
323 r = usrp.tune(self.u, 0, self.subdev, target_freq)
326 self.freq = target_freq
327 self.myform['freq'].set_value(target_freq) # update displayed value
328 self.myform['freq_slider'].set_value(target_freq) # update displayed value
329 self.update_status_bar()
330 self._set_status_msg("OK", 0)
333 self._set_status_msg("Failed", 0)
336 def set_gain(self, gain):
337 self.myform['gain'].set_value(gain) # update displayed value
338 self.subdev.set_gain(gain)
340 def update_status_bar (self):
341 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
342 self._set_status_msg(msg, 1)
343 self.src_fft.set_baseband_freq(self.freq)
345 def volume_range(self):
346 return (-20.0, 0.0, 0.5)
349 if __name__ == '__main__':
350 app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")