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#!/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,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
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)
# Set the subdevice spec
if(spec):
self.u.set_subdev_spec(spec, 0)
# Set the antenna
if(antenna):
self.u.set_antenna(antenna, 0)
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 ()
|
