3 # Copyright 2005,2006,2007,2009 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
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,
49 class wfm_rx_block (stdgui2.std_top_block):
50 def __init__(self,frame,panel,vbox,argv):
51 stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
53 parser=OptionParser(option_class=eng_option)
54 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
55 help="select USRP Rx side A or B (default=A)")
56 parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
57 help="set frequency to FREQ", metavar="FREQ")
58 parser.add_option("-g", "--gain", type="eng_float", default=40,
59 help="set gain in dB (default is midpoint)")
60 parser.add_option("-V", "--volume", type="eng_float", default=None,
61 help="set volume (default is midpoint)")
62 parser.add_option("-O", "--audio-output", type="string", default="",
63 help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
65 (options, args) = parser.parse_args()
79 self.u = usrp.source_c() # usrp is data source
81 adc_rate = self.u.adc_rate() # 64 MS/s
83 self.u.set_decim_rate(usrp_decim)
84 usrp_rate = adc_rate / usrp_decim # 320 kS/s
86 demod_rate = usrp_rate / chanfilt_decim
88 audio_rate = demod_rate / audio_decimation # 32 kHz
90 if options.rx_subdev_spec is None:
91 options.rx_subdev_spec = pick_subdevice(self.u)
93 self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
94 self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
95 print "Using RX d'board %s" % (self.subdev.side_and_name(),)
96 dbid = self.subdev.dbid()
97 if not (dbid == usrp_dbid.BASIC_RX or
98 dbid == usrp_dbid.TV_RX or
99 dbid == usrp_dbid.TV_RX_REV_2 or
100 dbid == usrp_dbid.TV_RX_REV_3):
101 print "This daughterboard does not cover the required frequency range"
102 print "for this application. Please use a BasicRX or TVRX daughterboard."
103 raw_input("Press ENTER to continue anyway, or Ctrl-C to exit.")
105 chan_filt_coeffs = optfir.low_pass (1, # gain
106 usrp_rate, # sampling rate
107 80e3, # passband cutoff
108 115e3, # stopband cutoff
109 0.1, # passband ripple
110 60) # stopband attenuation
111 #print len(chan_filt_coeffs)
112 chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
114 self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
116 self.volume_control = gr.multiply_const_ff(self.vol)
118 # sound card as final sink
119 audio_sink = audio.sink (int (audio_rate),
120 options.audio_output,
123 # now wire it all together
124 self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
126 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
128 if options.gain is None:
129 # if no gain was specified, use the mid-point in dB
130 g = self.subdev.gain_range()
131 options.gain = float(g[0]+g[1])/2
133 if options.volume is None:
134 g = self.volume_range()
135 options.volume = float(g[0]+g[1])/2
137 if abs(options.freq) < 1e6:
142 self.set_gain(options.gain)
143 self.set_vol(options.volume)
144 if not(self.set_freq(options.freq)):
145 self._set_status_msg("Failed to set initial frequency")
148 def _set_status_msg(self, msg, which=0):
149 self.frame.GetStatusBar().SetStatusText(msg, which)
152 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
154 def _form_set_freq(kv):
155 return self.set_freq(kv['freq'])
159 self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
160 fft_size=512, sample_rate=usrp_rate,
161 ref_scale=32768.0, ref_level=0, y_divs=12)
162 self.connect (self.u, self.src_fft)
163 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
166 post_filt_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
167 fft_size=1024, sample_rate=usrp_rate,
168 y_per_div=10, ref_level=0)
169 self.connect (self.guts.fm_demod, post_filt_fft)
170 vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
173 post_deemph_fft = fftsink2.fft_sink_f(self.panel, title="Post Deemph",
174 fft_size=512, sample_rate=audio_rate,
175 y_per_div=10, ref_level=-20)
176 self.connect (self.guts.deemph, post_deemph_fft)
177 vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
180 # control area form at bottom
181 self.myform = myform = form.form()
183 hbox = wx.BoxSizer(wx.HORIZONTAL)
185 myform['freq'] = form.float_field(
186 parent=self.panel, sizer=hbox, label="Freq", weight=1,
187 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
190 myform['freq_slider'] = \
191 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
192 range=(87.9e6, 108.1e6, 0.1e6),
193 callback=self.set_freq)
195 vbox.Add(hbox, 0, wx.EXPAND)
197 hbox = wx.BoxSizer(wx.HORIZONTAL)
201 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
202 weight=3, range=self.volume_range(),
203 callback=self.set_vol)
207 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
208 weight=3, range=self.subdev.gain_range(),
209 callback=self.set_gain)
211 vbox.Add(hbox, 0, wx.EXPAND)
214 self.knob = powermate.powermate(self.frame)
216 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
217 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
219 print "FYI: No Powermate or Contour Knob found"
222 def on_rotate (self, event):
223 self.rot += event.delta
224 if (self.state == "FREQ"):
226 self.set_freq(self.freq + .1e6)
229 self.set_freq(self.freq - .1e6)
232 step = self.volume_range()[2]
234 self.set_vol(self.vol + step)
237 self.set_vol(self.vol - step)
240 def on_button (self, event):
241 if event.value == 0: # button up
244 if self.state == "FREQ":
248 self.update_status_bar ()
251 def set_vol (self, vol):
252 g = self.volume_range()
253 self.vol = max(g[0], min(g[1], vol))
254 self.volume_control.set_k(10**(self.vol/10))
255 self.myform['volume'].set_value(self.vol)
256 self.update_status_bar ()
258 def set_freq(self, target_freq):
260 Set the center frequency we're interested in.
262 @param target_freq: frequency in Hz
265 Tuning is a two step process. First we ask the front-end to
266 tune as close to the desired frequency as it can. Then we use
267 the result of that operation and our target_frequency to
268 determine the value for the digital down converter.
270 r = usrp.tune(self.u, 0, self.subdev, target_freq)
273 self.freq = target_freq
274 self.myform['freq'].set_value(target_freq) # update displayed value
275 self.myform['freq_slider'].set_value(target_freq) # update displayed value
276 self.update_status_bar()
277 self._set_status_msg("OK", 0)
280 self._set_status_msg("Failed", 0)
283 def set_gain(self, gain):
284 self.myform['gain'].set_value(gain) # update displayed value
285 self.subdev.set_gain(gain)
287 def update_status_bar (self):
288 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
289 self._set_status_msg(msg, 1)
290 self.src_fft.set_baseband_freq(self.freq)
292 def volume_range(self):
293 return (-20.0, 0.0, 0.5)
296 if __name__ == '__main__':
297 app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")