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,
47 usrp_dbid.TV_RX_REV_2_MIMO,
48 usrp_dbid.TV_RX_REV_3_MIMO,
51 class wfm_rx_block (stdgui2.std_top_block):
52 def __init__(self,frame,panel,vbox,argv):
53 stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
55 parser=OptionParser(option_class=eng_option)
56 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
57 help="select USRP Rx side A or B (default=A)")
58 parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
59 help="set frequency to FREQ", metavar="FREQ")
60 parser.add_option("-g", "--gain", type="eng_float", default=65,
61 help="set gain in dB (default is midpoint)")
62 parser.add_option("-s", "--squelch", type="eng_float", default=0,
63 help="set squelch level (default is 0)")
64 parser.add_option("-V", "--volume", type="eng_float", default=None,
65 help="set volume (default is midpoint)")
66 parser.add_option("-O", "--audio-output", type="string", default="",
67 help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
70 (options, args) = parser.parse_args()
84 self.u = usrp.source_c() # usrp is data source
86 adc_rate = self.u.adc_rate() # 64 MS/s
88 self.u.set_decim_rate(usrp_decim)
89 usrp_rate = adc_rate / usrp_decim # 320 kS/s
91 demod_rate = usrp_rate / chanfilt_decim
93 audio_rate = 3*demod_rate / audio_decimation/2 # 48 kHz
95 if options.rx_subdev_spec is None:
96 options.rx_subdev_spec = pick_subdevice(self.u)
98 self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
99 self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
102 chan_filt_coeffs = gr.firdes.low_pass_2 (1, # gain
103 usrp_rate, # sampling rate
104 90e3, # passband cutoff
105 30e3, # transition bandwidth
106 70, # stopband attenuation
107 gr.firdes.WIN_BLACKMAN)
108 print len(chan_filt_coeffs)
109 chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
111 self.rchan_sample = blks2.rational_resampler_fff(3,2)
112 self.lchan_sample = blks2.rational_resampler_fff(3,2)
115 #self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
116 self.guts = blks2.wfm_rcv_pll (demod_rate, audio_decimation)
118 # FIXME rework {add,multiply}_const_* to handle multiple streams
119 self.volume_control_l = gr.multiply_const_ff(self.vol)
120 self.volume_control_r = gr.multiply_const_ff(self.vol)
122 # sound card as final sink
123 audio_sink = audio.sink (int (audio_rate),
124 options.audio_output,
127 # now wire it all together
128 self.connect (self.u, chan_filt, self.guts)
129 self.connect((self.guts, 0), self.lchan_sample,self.volume_control_l,(audio_sink,0))
130 self.connect((self.guts, 1), self.rchan_sample,self.volume_control_r,(audio_sink,1))
133 self.guts.stereo_carrier_pll_recovery.squelch_enable(True)
135 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
138 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
140 if options.gain is None:
141 # if no gain was specified, use the mid-point in dB
142 g = self.subdev.gain_range()
143 options.gain = float(g[0]+g[1])/2
145 if options.volume is None:
146 g = self.volume_range()
147 options.volume = float(g[0]+g[1])/2
149 if abs(options.freq) < 1e6:
154 self.set_gain(options.gain)
155 self.set_vol(options.volume)
157 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch)
159 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
161 if not(self.set_freq(options.freq)):
162 self._set_status_msg("Failed to set initial frequency")
165 def _set_status_msg(self, msg, which=0):
166 self.frame.GetStatusBar().SetStatusText(msg, which)
169 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
171 def _form_set_freq(kv):
172 return self.set_freq(kv['freq'])
176 self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
177 fft_size=512, sample_rate=usrp_rate,
178 ref_scale=32768.0, ref_level=0, y_divs=12)
179 self.connect (self.u, self.src_fft)
180 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
183 post_fm_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post FM Demod",
184 fft_size=512, sample_rate=demod_rate,
185 y_per_div=10, ref_level=0)
186 self.connect (self.guts.fm_demod, post_fm_demod_fft)
187 vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
190 post_stereo_carrier_generator_fft = fftsink2.fft_sink_c (self.panel, title="Post Stereo_carrier_generator",
191 fft_size=512, sample_rate=audio_rate,
192 y_per_div=10, ref_level=0)
193 self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
194 vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
197 post_deemphasis_left = fftsink2.fft_sink_f (self.panel, title="Post_Deemphasis_Left",
198 fft_size=512, sample_rate=audio_rate,
199 y_per_div=10, ref_level=0)
200 self.connect (self.guts.deemph_Left, post_deemphasis_left)
201 vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
204 post_deemphasis_right = fftsink2.fft_sink_f(self.panel, title="Post_Deemphasis_Right",
205 fft_size=512, sample_rate=audio_rate,
206 y_per_div=10, ref_level=-20)
207 self.connect (self.guts.deemph_Left, post_deemphasis_right)
208 vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
212 LmR_fft = fftsink2.fft_sink_f(self.panel, title="LmR",
213 fft_size=512, sample_rate=audio_rate,
214 y_per_div=10, ref_level=-20)
215 self.connect (self.guts.LmR_real,LmR_fft)
216 vbox.Add (LmR_fft.win, 4, wx.EXPAND)
219 self.scope = scopesink2.scope_sink_f(self.panel, sample_rate=demod_rate)
220 self.connect (self.guts.fm_demod,self.scope)
221 vbox.Add (self.scope.win,4,wx.EXPAND)
223 # control area form at bottom
224 self.myform = myform = form.form()
226 hbox = wx.BoxSizer(wx.HORIZONTAL)
228 myform['freq'] = form.float_field(
229 parent=self.panel, sizer=hbox, label="Freq", weight=1,
230 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
233 myform['freq_slider'] = \
234 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
235 range=(87.9e6, 108.1e6, 0.1e6),
236 callback=self.set_freq)
238 vbox.Add(hbox, 0, wx.EXPAND)
240 hbox = wx.BoxSizer(wx.HORIZONTAL)
244 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
245 weight=3, range=self.volume_range(),
246 callback=self.set_vol)
250 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
251 weight=3, range=self.subdev.gain_range(),
252 callback=self.set_gain)
255 myform['sqlch_thrsh'] = \
256 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
257 weight=3, range=(0.0,1.0,0.01),
258 callback=self.set_squelch)
260 vbox.Add(hbox, 0, wx.EXPAND)
263 self.knob = powermate.powermate(self.frame)
265 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
266 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
268 print "FYI: No Powermate or Contour Knob found"
271 def on_rotate (self, event):
272 self.rot += event.delta
273 if (self.state == "FREQ"):
275 self.set_freq(self.freq + .1e6)
278 self.set_freq(self.freq - .1e6)
281 step = self.volume_range()[2]
283 self.set_vol(self.vol + step)
286 self.set_vol(self.vol - step)
289 def on_button (self, event):
290 if event.value == 0: # button up
293 if self.state == "FREQ":
297 self.update_status_bar ()
300 def set_vol (self, vol):
301 g = self.volume_range()
302 self.vol = max(g[0], min(g[1], vol))
303 self.volume_control_l.set_k(10**(self.vol/10))
304 self.volume_control_r.set_k(10**(self.vol/10))
305 self.myform['volume'].set_value(self.vol)
306 self.update_status_bar ()
308 def set_squelch(self,squelch_threshold):
310 self.guts.stereo_carrier_pll_recovery.set_lock_threshold(squelch_threshold);
312 print "FYI: This implementation of the stereo_carrier_pll_recovery has no squelch implementation yet"
314 def set_freq(self, target_freq):
316 Set the center frequency we're interested in.
318 @param target_freq: frequency in Hz
321 Tuning is a two step process. First we ask the front-end to
322 tune as close to the desired frequency as it can. Then we use
323 the result of that operation and our target_frequency to
324 determine the value for the digital down converter.
326 r = usrp.tune(self.u, 0, self.subdev, target_freq)
329 self.freq = target_freq
330 self.myform['freq'].set_value(target_freq) # update displayed value
331 self.myform['freq_slider'].set_value(target_freq) # update displayed value
332 self.update_status_bar()
333 self._set_status_msg("OK", 0)
336 self._set_status_msg("Failed", 0)
339 def set_gain(self, gain):
340 self.myform['gain'].set_value(gain) # update displayed value
341 self.subdev.set_gain(gain)
343 def update_status_bar (self):
344 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
345 self._set_status_msg(msg, 1)
346 self.src_fft.set_baseband_freq(self.freq)
348 def volume_range(self):
349 return (-20.0, 0.0, 0.5)
352 if __name__ == '__main__':
353 app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")