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#!/usr/bin/env python
from gnuradio import gr, eng_notation
from gnuradio import usrp
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
def build_graph (cordic_freq):
audio_rate = 32000
sw_interp = 4
usrp_interp = 1000
audio_file = "/home/eb/demo/testing-audio.dat"
fg = gr.flow_graph ()
src = gr.file_source (gr.sizeof_float, audio_file, True)
gain = gr.multiply_const_ff (10000)
interp = gr.interp_fir_filter_fff (sw_interp, (1, 1, 1, 1))
f2c = gr.float_to_complex ()
u = usrp.sink_c (0, usrp_interp)
u.set_tx_freq (0, cordic_freq)
fg.connect (src, gain)
fg.connect (gain, interp)
fg.connect (interp, (f2c, 0))
fg.connect (interp, (f2c, 1))
fg.connect (f2c, u)
return fg
def main ():
parser = OptionParser (option_class=eng_option)
parser.add_option ("-c", "--cordic-freq", type="eng_float", default=10e6,
help="set Tx cordic frequency to FREQ", metavar="FREQ")
(options, args) = parser.parse_args ()
print "cordic_freq = %s" % (eng_notation.num_to_str (options.cordic_freq))
fg = build_graph (options.cordic_freq)
fg.start ()
raw_input ('Press Enter to quit: ')
fg.stop ()
if __name__ == '__main__':
main ()
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