1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
|
#!/usr/bin/env python
#
# Copyright 2005,2007,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, audio, blks2, uhd
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import slider, powermate
from gnuradio.wxgui import stdgui2, fftsink2, form
from optparse import OptionParser
import sys
import math
import wx
#////////////////////////////////////////////////////////////////////////
# Control Stuff
#////////////////////////////////////////////////////////////////////////
class my_top_block (stdgui2.std_top_block):
def __init__(self,frame,panel,vbox,argv):
stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
parser=OptionParser(option_class=eng_option)
parser.add_option("-a", "--args", type="string", default="",
help="UHD device address args [default=%default]")
parser.add_option("", "--spec", type="string", default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-V", "--volume", type="eng_float", default=None,
help="set volume (default is midpoint)")
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
parser.add_option("-N", "--no-gui", action="store_true", default=False)
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
if options.freq < 1e6:
options.freq *= 1e6
self.frame = frame
self.panel = panel
self.state = "FREQ"
self.freq = 0
self.freq_step = 25e3
self.rxpath = receive_path(options.args, options.spec, options.antenna,
options.gain, options.audio_output)
self.connect(self.rxpath)
self._build_gui(vbox, options.no_gui)
# set initial values
if options.volume is not None:
self.set_volume(options.volume)
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
self.set_gain(self.rxpath.gain) # update gui
self.set_volume(self.rxpath.volume) # update gui
self.set_squelch(self.rxpath.threshold()) # update gui
def _set_status_msg(self, msg, which=0):
self.frame.GetStatusBar().SetStatusText(msg, which)
def _build_gui(self, vbox, no_gui):
def _form_set_freq(kv):
return self.set_freq(kv['freq'])
self.src_fft = None
if 0 and not(no_gui):
self.src_fft = fftsink2.fft_sink_c(self.panel,
title="Data from USRP",
fft_size=512,
sample_rate=self.rxpath.if_rate,
ref_scale=32768.0,
ref_level=0,
y_per_div=10,
y_divs=12)
self.connect (self.rxpath.u, self.src_fft)
vbox.Add (self.src_fft.win, 4, wx.EXPAND)
if 1 and not(no_gui):
rx_fft = fftsink2.fft_sink_c(self.panel,
title="Post s/w Resampling",
fft_size=512,
sample_rate=self.rxpath.quad_rate,
ref_level=80,
y_per_div=20)
self.connect (self.rxpath.resamp, rx_fft)
vbox.Add (rx_fft.win, 4, wx.EXPAND)
if 1 and not(no_gui):
post_deemph_fft = fftsink2.fft_sink_f(self.panel,
title="Post Deemph",
fft_size=512,
sample_rate=self.rxpath.audio_rate,
y_per_div=10,
ref_level=-40)
self.connect (self.rxpath.fmrx.deemph, post_deemph_fft)
vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
if 0:
post_filt_fft = fftsink2.fft_sink_f(self.panel,
title="Post Filter",
fft_size=512,
sample_rate=audio_rate,
y_per_div=10,
ref_level=-40)
self.connect (self.guts.audio_filter, post_filt)
vbox.Add (fft_win4, 4, wx.EXPAND)
# control area form at bottom
self.myform = myform = form.form()
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0)
myform['freq'] = form.float_field(
parent=self.panel, sizer=hbox, label="Freq", weight=1,
callback=myform.check_input_and_call(_form_set_freq,
self._set_status_msg))
#hbox.Add((5,0), 0)
#myform['freq_slider'] = \
# form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
# range=(87.9e6, 108.1e6, 0.1e6),
# callback=self.set_freq)
hbox.Add((5,0), 0)
vbox.Add(hbox, 0, wx.EXPAND)
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0)
myform['volume'] = \
form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
weight=3, range=self.volume_range(),
callback=self.set_volume)
hbox.Add((5,0), 0)
myform['squelch'] = \
form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Squelch",
weight=3, range=self.rxpath.squelch_range(),
callback=self.set_squelch)
g = self.rxpath.u.get_gain_range()
hbox.Add((5,0), 0)
myform['gain'] = \
form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
weight=3, range=(g.start(), g.stop(), g.step()),
callback=self.set_gain)
hbox.Add((5,0), 0)
vbox.Add(hbox, 0, wx.EXPAND)
try:
self.knob = powermate.powermate(self.frame)
self.rot = 0
powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
except:
print "FYI: No Powermate or Contour Knob found"
def on_rotate (self, event):
self.rot += event.delta
if (self.state == "FREQ"):
if self.rot >= 3:
self.set_freq(self.freq + self.freq_step)
self.rot -= 3
elif self.rot <=-3:
self.set_freq(self.freq - self.freq_step)
self.rot += 3
else:
step = self.volume_range()[2]
if self.rot >= 3:
self.set_volume(self.rxpath.volume + step)
self.rot -= 3
elif self.rot <=-3:
self.set_volume(self.rxpath.volume - step)
self.rot += 3
def on_button (self, event):
if event.value == 0: # button up
return
self.rot = 0
if self.state == "FREQ":
self.state = "VOL"
else:
self.state = "FREQ"
self.update_status_bar ()
def set_squelch(self, threshold_in_db):
self.rxpath.set_squelch(threshold_in_db)
self.myform['squelch'].set_value(self.rxpath.threshold())
def set_volume (self, vol):
self.rxpath.set_volume(vol)
self.myform['volume'].set_value(self.rxpath.volume)
self.update_status_bar ()
def set_freq(self, target_freq):
r = self.rxpath.set_freq(target_freq)
if r:
self.freq = target_freq
self.myform['freq'].set_value(target_freq) # update displayed value
#self.myform['freq_slider'].set_value(target_freq) # update displayed value
self.update_status_bar()
self._set_status_msg("OK", 0)
return True
self._set_status_msg("Failed", 0)
return False
def set_gain(self, gain):
self.myform['gain'].set_value(gain) # update displayed value
self.rxpath.set_gain(gain)
def update_status_bar (self):
msg = "Volume:%r Setting:%s" % (self.rxpath.volume, self.state)
self._set_status_msg(msg, 1)
if self.src_fft:
self.src_fft.set_baseband_freq(self.freq)
def volume_range(self):
return (-20.0, 0.0, 0.5)
#////////////////////////////////////////////////////////////////////////
# Receive Path
#////////////////////////////////////////////////////////////////////////
USE_SIMPLE_SQUELCH = False
class receive_path(gr.hier_block2):
def __init__(self, args, spec, antenna, gain, audio_output):
gr.hier_block2.__init__(self, "receive_path",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
self.u = uhd.usrp_source(device_addr=args, stream_args=uhd.stream_args('fc32'))
# Set the subdevice spec
if(spec):
self.u.set_subdev_spec(spec, 0)
# Set the antenna
if(antenna):
self.u.set_antenna(antenna, 0)
self.if_rate = 256e3
self.quad_rate = 64e3
self.audio_rate = 32e3
self.u.set_samp_rate(self.if_rate)
dev_rate = self.u.get_samp_rate()
# Create filter to get actual channel we want
nfilts = 32
chan_coeffs = gr.firdes.low_pass (nfilts, # gain
nfilts*dev_rate, # sampling rate
8e3, # low pass cutoff freq
2e3, # width of trans. band
gr.firdes.WIN_HANN) # filter type
rrate = self.quad_rate / dev_rate
self.resamp = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts)
if USE_SIMPLE_SQUELCH:
self.squelch = gr.simple_squelch_cc(20)
else:
self.squelch = blks2.standard_squelch(self.audio_rate)
# instantiate the guts of the single channel receiver
self.fmrx = blks2.nbfm_rx(self.audio_rate, self.quad_rate)
# audio gain / mute block
self._audio_gain = gr.multiply_const_ff(1.0)
# sound card as final sink
audio_sink = audio.sink (int(self.audio_rate), audio_output)
# now wire it all together
if USE_SIMPLE_SQUELCH:
self.connect (self.u, self.resamp, self.squelch, self.fmrx,
self._audio_gain, audio_sink)
else:
self.connect (self.u, self.resamp, self.fmrx, self.squelch,
self._audio_gain, audio_sink)
if gain is None:
# if no gain was specified, use the mid-point in dB
g = self.u.get_gain_range()
gain = float(g.start()+g.stop())/2
self.set_gain(gain)
v = self.volume_range()
self.set_volume((v[0]+v[1])/2)
s = self.squelch_range()
self.set_squelch((s[0]+s[1])/2)
def volume_range(self):
return (-20.0, 0.0, 0.5)
def set_volume (self, vol):
g = self.volume_range()
self.volume = max(g[0], min(g[1], vol))
self._update_audio_gain()
def _update_audio_gain(self):
self._audio_gain.set_k(10**(self.volume/10))
def squelch_range(self):
r = self.squelch.squelch_range()
#print "squelch_range: ", r
return r
def set_squelch(self, threshold):
#print "SQL =", threshold
self.squelch.set_threshold(threshold)
def threshold(self):
t = self.squelch.threshold()
#print "t =", t
return t
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
"""
r = self.u.set_center_freq(target_freq)
if r:
return True
return False
def set_gain(self, gain):
self.gain = gain
self.u.set_gain(gain)
# ////////////////////////////////////////////////////////////////////////
# Main
# ////////////////////////////////////////////////////////////////////////
if __name__ == '__main__':
app = stdgui2.stdapp (my_top_block, "USRP NBFM RX")
app.MainLoop ()
|
