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#!/usr/bin/env python
from gnuradio import gr, gru, eng_notation
from gnuradio import usrp
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import usrp_dbid
import time
import os.path
def make_filename(dir, freq, decim, nchan, suffix):
t = time.strftime('%Y%m%d-%H%M%S')
f = 'R%s-%s-%d-%d.%s' % (
t, eng_notation.num_to_str(freq), decim, nchan, suffix)
return os.path.join(dir, f)
class radar_graph(gr.flow_graph):
def __init__(self):
gr.flow_graph.__init__(self)
parser = OptionParser (option_class=eng_option)
#parser.add_option("-S", "--subdev", type="subdev", default=(0, None),
# help="select USRP Rx side A or B (default=A)")
parser.add_option("-d", "--decim", type="int", default=64,
help="set fgpa decimation rate to DECIM (default=64)")
parser.add_option("-f", "--freq", type="eng_float", default=104.5e6,
help="set frequency to FREQ (default=104.5M)", metavar="FREQ")
parser.add_option("", "--gain0", type="eng_float", default=0,
help="set gain in dB (default 0)")
parser.add_option("", "--gain1", type="eng_float", default=11,
help="set gain in dB (default 11)")
parser.add_option("-F", "--filename", default=None)
parser.add_option("-D", "--dir", default=None)
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
if options.filename is None and options.dir is None:
sys.stderr.write('Must specify either -F FILENAME or -D DIR\n')
parser.print_help()
sys.exit(1)
nchan = 2
# if filename was given, use it, otherwise build one.
if options.filename is None:
options.filename = make_filename(options.dir, options.freq,
options.decim, nchan, 'srd')
self.u = usrp.source_s(0, options.decim, nchan, 0, 0)
self.subdev = self.u.db[0]
if self.u.db[0][0].dbid() != usrp_dbid.BASIC_RX:
sys.stderr.write('This code requires a Basic Rx board on Side A\n')
sys.exit(1)
# self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.subdev))
self.u.set_mux(gru.hexint(0xf0f0f1f0))
dst = gr.file_sink (gr.sizeof_short, options.filename)
self.connect (self.u, dst)
self.subdev[0].set_gain(options.gain0)
self.subdev[1].set_gain(options.gain1)
self.set_freq(options.freq)
def set_freq(self, target_freq):
ok = True
for i in range(len(self.subdev)):
r = usrp.tune(self.u, i, self.subdev[i], target_freq)
if not r:
ok = False
print "set_freq: failed to set subdev[%d] freq to %f" % (
i, target_freq)
return ok
if __name__ == '__main__':
fg = radar_graph()
try:
fg.run()
except KeyboardInterrupt:
pass
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