def create_usrp_sink(options):
u = blks2.generic_usrp_sink_c(
usrpx=options.usrpx,
which=options.which,
subdev_spec=options.tx_subdev_spec,
interface=options.interface,
mac_addr=options.mac_addr,
fusb_block_size=options.fusb_block_size,
fusb_nblocks=options.fusb_nblocks,
lo_offset=options.lo_offset,
gain=options.tx_gain,
)
if options.show_tx_gain_range:
print "Tx Gain Range: minimum = %g, maximum = %g, step size = %g"%tuple(u.gain_range())
return u
def create_usrp_sink(options):
u = blks2.generic_usrp_sink_c(
usrpx=options.usrpx,
which=options.which,
subdev_spec=options.tx_subdev_spec,
interface=options.interface,
mac_addr=options.mac_addr,
fusb_block_size=options.fusb_block_size,
fusb_nblocks=options.fusb_nblocks,
lo_offset=options.lo_offset,
gain=options.tx_gain,
)
if options.show_tx_gain_range:
print "Tx Gain Range: minimum = %g, maximum = %g, step size = %g" % tuple(
u.gain_range())
return u
def __init__(self, options, input_filename):
gr.top_block.__init__(self)
gr.enable_realtime_scheduling()
if options.real:
sizeof_input_samples = gr.sizeof_float
else:
sizeof_input_samples = gr.sizeof_gr_complex
self.src = gr.file_source(sizeof_input_samples,
input_filename,
repeat = options.loop)
self.u = generic_usrp_sink_c(interface = options.interface,
mac_addr = options.mac_addr,
subdev_spec = options.tx_subdev_spec)
print 'Using %s' % str(self.u)
print 'Possible tx frequency range: %s - %s' % \
(n2s(self.u.freq_range()[0]), n2s(self.u.freq_range()[1]))
# we need to find the closest decimation rate the USRP can handle
# to the input file's sampling rate
try:
ideal_interp = self.u.dac_rate() / options.rate
# pick the closest interpolation rate
interp = [x for x in self.u.get_interp_rates()
if x <= ideal_interp][-1]
self.u.set_interp(interp)
except IndexError:
sys.stderr.write('Failed to set USRP interpolation rate\n')
raise SystemExit, 1
output_rate = self.u.dac_rate() / interp
resamp_ratio = output_rate / options.rate
# since the input file sample rate may not be exactly what our
# output rate of the USRP (as determined by the interpolation rate),
# we need to resample our input to the output rate
num_filters = 32
cutoff = 0.99 * options.rate / 2.
transition = 0.1 * options.rate / 2.
resamp_taps = gr.firdes_low_pass(num_filters * 1.0,
num_filters * options.rate,
cutoff,
transition)
self.resamp = gr.pfb_arb_resampler_ccf(resamp_ratio,
resamp_taps,
num_filters)
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
self.u.set_gain(options.gain)
res = self.u.set_center_freq(options.freq)
if not res:
sys.stderr.write('Failed to set frequency\n')
raise SystemExit, 1
if options.real:
# our samples are real
# we need to convert them to complex without a hilbert filter
self.hilbert = gr.hilbert_fc(64)
self.connect(self.src, self.hilbert, self.resamp, self.u)
else:
# our samples are complex
self.connect(self.src, self.resamp, self.u)
