#!/usr/bin/env python
#
# Copyright 2005-2007,2011,2012 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, eng_notation
from gnuradio import filter
from gnuradio import analog
from gnuradio import audio
from gnuradio import 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
class wfm_rx_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("-s", "--samp-rate", type="eng_float", default=1e6,
help="set sample rate (bandwidth) [default=%default]")
parser.add_option("-f", "--freq", type="eng_float", default=1008.0e3,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-I", "--use-if-freq", action="store_true", default=False,
help="use intermediate freq (compensates DC problems in quadrature boards)" )
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is maximum)")
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.use_IF=options.use_if_freq
if self.use_IF:
self.IF_freq=64000.0
else:
self.IF_freq=0.0
self.vol = 0
self.state = "FREQ"
self.freq = 0
# build graph
self.u = uhd.usrp_source(device_addr=options.args, stream_args=uhd.stream_args('fc32'))
# Set the subdevice spec
if(options.spec):
self.u.set_subdev_spec(options.spec, 0)
# Set the antenna
if(options.antenna):
self.u.set_antenna(options.antenna, 0)
usrp_rate = 256e3
demod_rate = 64e3
audio_rate = 32e3
chanfilt_decim = int(usrp_rate // demod_rate)
audio_decim = int(demod_rate // audio_rate)
self.u.set_samp_rate(usrp_rate)
dev_rate = self.u.get_samp_rate()
# Resample signal to exactly self.usrp_rate
# FIXME: make one of the follow-on filters an arb resampler
rrate = usrp_rate / dev_rate
self.resamp = filter.pfb.arb_resampler_ccf(rrate)
chan_filt_coeffs = filter.firdes.low_pass_2(1, # gain
usrp_rate, # sampling rate
8e3, # passband cutoff
4e3, # transition bw
60) # stopband attenuation
if self.use_IF:
# Turn If to baseband and filter.
self.chan_filt = filter.freq_xlating_fir_filter_ccf(chanfilt_decim,
chan_filt_coeffs,
self.IF_freq,
usrp_rate)
else:
self.chan_filt = filter.fir_filter_ccf(chanfilt_decim, chan_filt_coeffs)
self.agc = analog.agc_cc(0.1, 1, 1, 100000)
self.am_demod = gr.complex_to_mag()
self.volume_control = gr.multiply_const_ff(self.vol)
audio_filt_coeffs = filter.firdes.low_pass_2(1, # gain
demod_rate, # sampling rate
8e3, # passband cutoff
2e3, # transition bw
60) # stopband attenuation
self.audio_filt = filter.fir_filter_fff(audio_decim, audio_filt_coeffs)
# sound card as final sink
self.audio_sink = audio.sink(int (audio_rate),
options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect (self.u, self.resamp, self.chan_filt, self.agc,
self.am_demod, self.audio_filt,
self.volume_control, self.audio_sink)
self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
if options.gain is None:
g = self.u.get_gain_range()
if True:
# if no gain was specified, use the mid gain
options.gain = (g.start() + g.stop())/2.0
options.gain = g.stop()
if options.volume is None:
v = self.volume_range()
options.volume = float(v[0]*3+v[1])/4.0
if abs(options.freq) < 1e3:
options.freq *= 1e3
# set initial values
self.set_gain(options.gain)
self.set_vol(options.volume)
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 0:
self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
fft_size=512, sample_rate=usrp_rate,
ref_scale=32768.0, ref_level=0.0, y_divs=12)
self.connect (self.u, self.src_fft)
vbox.Add (self.src_fft.win, 4, wx.EXPAND)
if 0:
self.post_filt_fft = fftsink2.fft_sink_c(self.panel, title="Post Channel filter",
fft_size=512, sample_rate=demod_rate)
self.connect (self.chan_filt, self.post_filt_fft)
vbox.Add (self.post_filt_fft.win, 4, wx.EXPAND)
if 0:
post_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
fft_size=1024, sample_rate=demod_rate,
y_per_div=10, ref_level=0)
self.connect (self.am_demod, post_demod_fft)
vbox.Add (post_demod_fft.win, 4, wx.EXPAND)
if 1:
audio_fft = fftsink2.fft_sink_f(self.panel, title="Audio",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=20)
self.connect (self.audio_filt, audio_fft)
vbox.Add (audio_fft.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=(520.0e3, 1611.0e3, 1.0e3),
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)
g = self.u.get_gain_range()
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 + .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.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.
Args:
target_freq: frequency in Hz
@rypte: bool
"""
r = self.u.set_center_freq(target_freq + self.IF_freq, 0)
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.u.set_gain(gain)
def update_status_bar (self):
msg = "Volume:%r Setting:%s" % (self.vol, self.state)
self._set_status_msg(msg, 1)
try:
self.src_fft.set_baseband_freq(self.freq)
except:
None
def volume_range(self):
return (-40.0, 0.0, 0.5)
if __name__ == '__main__':
app = stdgui2.stdapp (wfm_rx_block, "USRP Broadcast AM MW RX")
app.MainLoop ()