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osmo-tetra
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demod: use current uhd arguments scheme in uhd-tetra_demod.py 

also introduces --spec argument useful with usrp1
This commit is contained in:
Dimitri Stolnikov 2011-12-27 12:14:03 +01:00
parent 7226098a9c
commit 617dacf7b9
1 changed files with 31 additions and 20 deletions
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51
src/demod/python/uhd-tetra_demod.py Normal file → Executable file
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@ -22,34 +22,43 @@ class my_top_block(gr.top_block):
# Create a UHD source
self._u = uhd.usrp_source(
device_addr=options.device_addr,
device_addr=options.args,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
sample_rate = 100e6/512
# Set the subdevice spec
if(options.spec):
self._u.set_subdev_spec(options.spec, 0)
# Set the antenna
if(options.antenna):
self._u.set_antenna(options.antenna, 0)
# Pick the lowest possible value for the input rate
supported_rates = self._u.get_samp_rates()
self._u.set_samp_rate(supported_rates.start())
sample_rate = self._u.get_samp_rate()
symbol_rate = 18000
sps = 2
# set sampling rate and antenna port
self._u.set_samp_rate(sample_rate)
self._u.set_antenna(options.antenna, 0)
# output rate will be 36,000
ntaps = 11 * sps
new_sample_rate = symbol_rate * sps
# Set receive daughterboard gain
if options.gain is None:
g = self._u.get_gain_range()
options.gain = float(g.stop()+g.start())/2
print "Using mid-point gain of", options.gain, "(", g.start(), "-", g.stop(), ")"
self._u.set_gain(options.gain)
# Set receive frequency
if options.lo_offset is not None:
self._u.set_lo_offset(options.lo_offset)
tr = self._u.set_center_freq(options.freq)
# Set frequency (tune request takes lo_offset)
if(options.lo_offset is not None):
treq = uhd.tune_request(options.freq, options.lo_offset)
else:
treq = uhd.tune_request(options.freq)
tr = self._u.set_center_freq(treq)
if tr == None:
sys.stderr.write('Failed to set center frequency\n')
raise SystemExit, 1
@ -80,10 +89,12 @@ class my_top_block(gr.top_block):
def get_options():
parser = OptionParser(option_class=eng_option)
# usrp related settings
parser.add_option("-d", "--device_addr", type="string", default="",
help="UHD device address [default=%default]")
parser.add_option("-a", "--antenna", type="string", default="TX/RX",
help="daughterboard antenna [default=%default]")
parser.add_option("-a", "--args", type="string", default="",
help="UHD device address args, [default=%default]")
parser.add_option("", "--spec", type="string", default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("-f", "--freq", type="eng_float", default=None,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=None,
@ -102,12 +113,12 @@ def get_options():
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
if options.freq is None:
parser.print_help()
sys.stderr.write('You must specify the frequency with -f FREQ\n');
raise SystemExit, 1
return (options)
if __name__ == "__main__":