Hello,
I need some help with an error I'm getting.
python: /usr/include/boost/shared_ptr.hpp:419: T* boost::shared_ptr<
<template-parameter-1-1> >::operator->() const [with T = db_base]: Assertion
`px != 0' failed.
What could be causing this? The entire code is the following:
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Signal To Raw
# Generated: Fri Feb 12 01:11:49 2010
##################################################
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from grc_gnuradio import usrp as grc_usrp
from optparse import OptionParser
import datetime
import time
class signal_to_raw(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
today = datetime.datetime.now()
print "Starting: %s" % today.isoformat(' ')
##################################################
# option parser
##################################################
### usage="%prog: [options] output_filename0 output_filename1 "
parser = OptionParser(option_class=eng_option) ###, usage=usage)
parser.add_option("-R", "--rx_subdev_spec0", type="subdev",
default=(0,0),help="first channel select USRP Rx side A or B(default=A)")
parser.add_option("-r", "--rx_subdev_spec1", type="subdev",
default=(1,0),help="second channel select USRP Rx side A or B(default=A)")
parser.add_option("-d", "--decim", type="int",
default=256,help="set fgpa decimation rate to DECIM[default=%default]")
parser.add_option("-f", "--freq", type="eng_float",
default=54.1e6,help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float",
default=100,help="set gain in dB (default is midpoint)")
#parser.add_option("-N", "--nsamples", type="eng_float",
default=9600000,help="number of samples to collect[default=9600000]")
parser.add_option("-t", "--time", type="eng_float",
default=3540.0,help="length of recording in seconds [default=0]")
parser.add_option("-F", "--fft", type="int",
default=-1,help="display real-time FFT")
#parser.add_option("-
(options, args) = parser.parse_args ()
if len(args) !=0:
parser.print_help()
raise SystemExit, 1
##################################################
# File name
##################################################
adc_rate = 64e6
decim = options.decim
usrp_rate = adc_rate/decim
interp = 4 # this is the interpolation interval for the "one in N"
function
outdir = '/home/tamember/radar/gr_jp/'
#basename = 'grdata_'
today = datetime.datetime.now()
datestamp = today.strftime("%y%m%d%H%M%S")
gain = options.gain
gainset = '%d_' % (gain)
freq = options.freq
in_kHz = freq/1000
freqn = '%dkHz_' % (in_kHz)
rate = '%i' % ((usrp_rate * 2)/interp)
filenamea = outdir + datestamp + "_" + gainset + freqn + rate +
'_cha.dat'
filenameb = outdir + datestamp + "_" + gainset + freqn + rate +
'_chb.dat'
##################################################
# Blocks
##################################################
self.gr_file_sink_A = gr.file_sink(gr.sizeof_gr_complex*1,
"/gr_jp/filenamea")
self.gr_file_sink_B = gr.file_sink(gr.sizeof_gr_complex*1,
"/gr_jp/filenameb")
self.usrp_dual_source_x_0 = grc_usrp.dual_source_c(which=0,
rx_ant_a='RXA', rx_ant_b="RXB")
self.usrp_dual_source_x_0.set_decim_rate(decim)
self.usrp_dual_source_x_0.set_frequency_a(freq, verbose=True)
self.usrp_dual_source_x_0.set_frequency_b(freq, verbose=True)
self.usrp_dual_source_x_0.set_gain_a(gain)
self.usrp_dual_source_x_0.set_gain_b(gain)
##################################################
# Connections
##################################################
self.connect((self.usrp_dual_source_x_0, 0), (self.gr_file_sink_A, 0))
self.connect((self.usrp_dual_source_x_0, 1), (self.gr_file_sink_B, 0))
print 'Sample rate is: %ikHz' % (usrp_rate*2/(1000*interp))
print 'ADC rate is: %iMHz' % (usrp_dual_source_x_0.adc_rate()/1000000)
print "Gain: %i" % (gain)
print "Freq is set to: %sMHz" % (freq/float(1000000.0))
print "Decimation interval is: %i" % (usrp_dual_source_x_0.decim_rate())
print "Interpolation interval is: %i" % (interp)
if __name__ == '__main__':
if gr.enable_realtime_scheduling() != gr.RT_OK:
print "Error: failed to enable realtime scheduling."
tb = signal_to_raw()
tb.start()
raw_input('Press Enter to quit: ')
tb.stop()
today = datetime.datetime.now()
print "Ending: %s" % today.isoformat(' ')
print ""
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