| Hi Alex, On Jul 16, 2010, at 8:11 PM, Alexandru Csete wrote:
Wow, that worked!! I'm getting a clean strong FM audio reception now. |
#!/usr/bin/env python # # Copyright 2005,2006,2007,2008,2009 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, gru, eng_notation, optfir
from gnuradio import audio
from gnuradio import usrp2
from gnuradio import blks2
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("-e", "--interface", type="string", default="eth0",
help="select Ethernet interface, default is eth0")
parser.add_option("-m", "--mac-addr", type="string", default="",
help="select USRP by MAC address, default is auto-select")
#parser.add_option("-A", "--antenna", default=None,
# help="select Rx Antenna (only on RFX-series boards)")
parser.add_option("-f", "--freq", type="eng_float", default=100.1,
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("-i", "--input-rate", type="eng_float", default=32050,
help="set input sample rate to RATE (%default)")
parser.add_option("-o", "--output-rate", type="eng_float", default=48000,
help="set output sample rate to RATE (%default)")
(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
# USRP2 source
self.u = usrp2.source_32fc(options.interface, options.mac_addr)
adc_rate = self.u.adc_rate() # 100 MS/s
usrp_decim = 400
self.u.set_decim(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
print "audio rate =", audio_rate
#FIXME: need named constants and text descriptions available to (gr-)usrp2 even
#when usrp(1) module is not built. A usrp_common module, perhaps?
dbid = self.u.daughterboard_id()
print "Using RX d'board 0x%04X" % (dbid,)
if not (dbid == 0x0001 or #usrp_dbid.BASIC_RX
dbid == 0x0003 or #usrp_dbid.TV_RX
dbid == 0x000c or #usrp_dbid.TV_RX_REV_2
dbid == 0x0040 or #usrp_dbid.TV_RX_REV_3
dbid == 0x0043 or #usrp_dbid.TV_RX_MIMO
dbid == 0x0044 or #usrp_dbid.TV_RX_REV_2_MIMO
dbid == 0x0045 or #usrp_dbid.TV_RX_REV_3_MIMO
dbid == 0x0053 ): #usrp_dbid.WBX
print "This daughterboard does not cover the required frequency range"
print "for this application. Please use a BasicRX or TVRX daughterboard."
raw_input("Press ENTER to continue anyway, or Ctrl-C to exit.")
# channel filter co-efficients
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)
# wide-band FM demodulator
self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
# rational resampler
#input_rate = int(options.input_rate) # 32050 Hz default
input_rate = audio_rate # 32051 Hz as computed earlier (line 82), but hangs the application
output_rate = int(options.output_rate) # 48 kHz default
interp = gru.lcm(input_rate, output_rate) / input_rate
decim = gru.lcm(input_rate, output_rate) / output_rate
print "interp =", interp
print "decim =", decim
rr = blks2.rational_resampler_fff(interp, decim)
# volume control
self.volume_control = gr.multiply_const_ff(self.vol)
# sound card as final sink
audio_sink = audio.sink (int (output_rate),
options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect (self.u, chan_filt, self.guts, rr, self.volume_control, audio_sink)
#self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
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.u.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)
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 = fftsink2.fft_sink_c(self.panel, title="Data from USRP2",
fft_size=512, sample_rate=usrp_rate,
ref_scale=1.0, ref_level=0, y_divs=12)
self.connect (self.u, self.src_fft)
vbox.Add (self.src_fft.win, 4, wx.EXPAND)
if 1:
post_filt_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
fft_size=1024, sample_rate=usrp_rate,
y_per_div=10, ref_level=0)
self.connect (self.guts.fm_demod, post_filt_fft)
vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
if 0:
post_deemph_fft = fftsink2.fft_sink_f(self.panel, title="Post Deemph",
fft_size=512, sample_rate=audio_rate,
y_per_div=10, ref_level=-20)
self.connect (self.guts.deemph, post_deemph_fft)
vbox.Add (post_deemph_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=(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.u.gain_range(),
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:
pass
#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.
@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 = self.u.set_center_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.u.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 = stdgui2.stdapp (wfm_rx_block, "USRP2 WFM RX")
app.MainLoop ()
Best regards, Elvis Dowson |
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