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#!/usr/bin/env python
from gnuradio import gr, gru, eng_notation, optfir
from gnuradio import audio
from gnuradio import usrp
from gnuradio import blks
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import slider, powermate
from gnuradio.wxgui import stdgui, fftsink, form, scopesink
from optparse import OptionParser
from usrpm import usrp_dbid
import sys
import math
import wx
def pick_subdevice(u):
"""
The user didn't specify a subdevice on the command line.
Try for one of these, in order: TV_RX, BASIC_RX, whatever is on side A.
@return a subdev_spec
"""
return usrp.pick_subdev(u, (usrp_dbid.TV_RX,
usrp_dbid.TV_RX_REV_2,
usrp_dbid.TV_RX_REV_3,
usrp_dbid.BASIC_RX))
class wfm_rx_graph (stdgui.gui_flow_graph):
def __init__(self,frame,panel,vbox,argv):
stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)
parser=OptionParser(option_class=eng_option)
parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
help="select USRP Rx side A or B (default=A)")
parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=65,
help="set gain in dB (default is midpoint)")
parser.add_option("-s", "--squelch", type="eng_float", default=0,
help="set squelch level (default is 0)")
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")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.frame = frame
self.panel = panel
self.vol = 0
self.state = "FREQ"
self.freq = 0
# build graph
self.u = usrp.source_c() # usrp is data source
adc_rate = self.u.adc_rate() # 64 MS/s
usrp_decim = 200
self.u.set_decim_rate(usrp_decim)
usrp_rate = adc_rate / usrp_decim # 320 kS/s
chanfilt_decim = 1
demod_rate = usrp_rate / chanfilt_decim
audio_decimation = 10
audio_rate = demod_rate / audio_decimation # 32 kHz
if options.rx_subdev_spec is None:
options.rx_subdev_spec = pick_subdevice(self.u)
self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
chan_filt_coeffs = optfir.low_pass (1, # gain
usrp_rate, # sampling rate
80e3, # passband cutoff
115e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
#print len(chan_filt_coeffs)
chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
#self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation)
self.guts = blks.wfm_rcv_pll (self, demod_rate, audio_decimation)
# FIXME rework {add,multiply}_const_* to handle multiple streams
self.volume_control_l = gr.multiply_const_ff(self.vol)
self.volume_control_r = gr.multiply_const_ff(self.vol)
# sound card as final sink
audio_sink = audio.sink (int (audio_rate),
options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect (self.u, chan_filt, self.guts)
self.connect ((self.guts, 0), self.volume_control_l, (audio_sink, 0))
self.connect ((self.guts, 1), self.volume_control_r, (audio_sink, 1))
self.guts.stereo_carrier_pll_recovery.squelch_enable(True);
self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.subdev.gain_range()
options.gain = float(g[0]+g[1])/2
if options.volume is None:
g = self.volume_range()
options.volume = float(g[0]+g[1])/2
if abs(options.freq) < 1e6:
options.freq *= 1e6
# set initial values
self.set_gain(options.gain)
self.set_vol(options.volume)
self.guts.stereo_carrier_pll_recovery.set_lock_threshold(options.squelch);
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
def _set_status_msg(self, msg, which=0):
self.frame.GetStatusBar().SetStatusText(msg, which)
def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
def _form_set_freq(kv):
return self.set_freq(kv['freq'])
if 1:
self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
fft_size=512, sample_rate=usrp_rate)
self.connect (self.u, self.src_fft)
vbox.Add (self.src_fft.win, 4, wx.EXPAND)
if 1:
post_fm_demod_fft = fftsink.fft_sink_f (self, self.panel, title="Post FM Demod",
fft_size=512, sample_rate=demod_rate,
y_per_div=10, ref_level=0)
self.connect (self.guts.fm_demod, post_fm_demod_fft)
vbox.Add (post_fm_demod_fft.win, 4, wx.EXPAND)
if 0:
post_stereo_carrier_generator_fft = fftsink.fft_sink_c (self, self.panel, title="Post Stereo_carrier_generator",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=0)
self.connect (self.guts.stereo_carrier_generator, post_stereo_carrier_generator_fft)
vbox.Add (post_stereo_carrier_generator_fft.win, 4, wx.EXPAND)
if 0:
post_deemphasis_left = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Left",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=0)
self.connect (self.guts.deemph_Left, post_deemphasis_left)
vbox.Add (post_deemphasis_left.win, 4, wx.EXPAND)
if 0:
post_deemphasis_right = fftsink.fft_sink_f (self, self.panel, title="Post_Deemphasis_Right",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=-20)
self.connect (self.guts.deemph_Left, post_deemphasis_right)
vbox.Add (post_deemphasis_right.win, 4, wx.EXPAND)
if 0:
LmR_fft = fftsink.fft_sink_f (self, self.panel, title="LmR",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=-20)
self.connect (self.guts.LmR_real,LmR_fft)
vbox.Add (LmR_fft.win, 4, wx.EXPAND)
if 0:
self.scope = scopesink.scope_sink_f(self, self.panel, sample_rate=demod_rate)
self.connect (self.guts.fm_demod_a,self.scope)
vbox.Add (self.scope.win,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_vol)
hbox.Add((5,0), 1)
myform['gain'] = \
form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
weight=3, range=self.subdev.gain_range(),
callback=self.set_gain)
hbox.Add((5,0), 0)
myform['sqlch_thrsh'] = \
form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Stereo Squelch Threshold",
weight=3, range=(0.0,1.0,0.01),
callback=self.guts.stereo_carrier_pll_recovery.set_lock_threshold)
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 + .1e6)
self.rot -= 3
elif self.rot <=-3:
self.set_freq(self.freq - .1e6)
self.rot += 3
else:
step = self.volume_range()[2]
if self.rot >= 3:
self.set_vol(self.vol + step)
self.rot -= 3
elif self.rot <=-3:
self.set_vol(self.vol - 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_vol (self, vol):
g = self.volume_range()
self.vol = max(g[0], min(g[1], vol))
self.volume_control_l.set_k(10**(self.vol/10))
self.volume_control_r.set_k(10**(self.vol/10))
self.myform['volume'].set_value(self.vol)
self.update_status_bar ()
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital down converter.
"""
r = usrp.tune(self.u, 0, self.subdev, 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.subdev.set_gain(gain)
def update_status_bar (self):
msg = "Volume:%r Setting:%s" % (self.vol, self.state)
self._set_status_msg(msg, 1)
self.src_fft.set_baseband_freq(self.freq)
def volume_range(self):
return (-20.0, 0.0, 0.5)
if __name__ == '__main__':
app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")
app.MainLoop ()
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