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[Commit-gnuradio] r4672 - in gnuradio/branches/developers/jcorgan/est: c
|
From: |
jcorgan |
|
Subject: |
[Commit-gnuradio] r4672 - in gnuradio/branches/developers/jcorgan/est: config gnuradio-examples/python/hier gnuradio-examples/python/hier/sounder |
|
Date: |
Wed, 28 Feb 2007 15:55:10 -0700 (MST) |
Author: jcorgan
Date: 2007-02-28 15:55:10 -0700 (Wed, 28 Feb 2007)
New Revision: 4672
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/Makefile.am
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_rx.py
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_tx.py
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sink.py
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_source.py
Modified:
gnuradio/branches/developers/jcorgan/est/config/grc_gnuradio_examples.m4
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/Makefile.am
Log:
Work in progress.
Modified:
gnuradio/branches/developers/jcorgan/est/config/grc_gnuradio_examples.m4
===================================================================
--- gnuradio/branches/developers/jcorgan/est/config/grc_gnuradio_examples.m4
2007-02-28 21:19:33 UTC (rev 4671)
+++ gnuradio/branches/developers/jcorgan/est/config/grc_gnuradio_examples.m4
2007-02-28 22:55:10 UTC (rev 4672)
@@ -34,6 +34,7 @@
gnuradio-examples/python/hier/Makefile \
gnuradio-examples/python/hier/audio/Makefile \
gnuradio-examples/python/hier/ofdm/Makefile \
+ gnuradio-examples/python/hier/sounder/Makefile \
gnuradio-examples/python/multi-antenna/Makefile \
gnuradio-examples/python/multi_usrp/Makefile \
gnuradio-examples/python/networking/Makefile \
Modified:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/Makefile.am
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/Makefile.am
2007-02-28 21:19:33 UTC (rev 4671)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/Makefile.am
2007-02-28 22:55:10 UTC (rev 4672)
@@ -21,4 +21,6 @@
SUBDIRS = \
audio \
- ofdm
+ ofdm \
+ networking \
+ sounder
Property changes on:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder
___________________________________________________________________
Name: svn:ignore
+ Makefile
Makefile.in
*.pyc
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/Makefile.am
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/Makefile.am
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/Makefile.am
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,30 @@
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+EXTRA_DIST = \
+ usrp_sounder_rx.py \
+ usrp_sounder_tx.py \
+ usrp_source.py \
+ usrp_sink.py \
+ sounder_rx.py \
+ sounder_tx.py
+
+MOSTLYCLEANFILES = *.pyc *~
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_rx.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_rx.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_rx.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, usrp, eng_notation
+from usrp_source import usrp_source_c
+import math
+
+n2s = eng_notation.num_to_str
+
+class sounder_rx(gr.hier_block2):
+ """
+ Creates a top-level channel sounder block with the given parameters.
+ """
+
+ def __init__(self, subdev_spec, freq, cal, verbose, max_delay, chip_rate,
gain):
+
+ # Call hierarchical block constructor
+ # Top-level blocks have no inputs or outputs
+ gr.hier_block2.__init__(self,
+ "sounder_rx", # Block typename
+ gr.io_signature(0,0,0), # Input signature
+ gr.io_signature(0,0,0)) # Output signature
+ self._freq = freq
+ self._cal = cal
+ self._verbose = verbose
+ self._max_delay = max_delay
+
+ self._u = usrp_source_c(0, subdev_spec, gain, chip_rate, self._freq,
self._cal, verbose)
+ self.define_component("usrp", self._u)
+
+ self._chip_rate = self._u._if_rate
+ self._resolution = 1.0/self._chip_rate
+
+ min_chips = int(math.ceil(2.0*self._max_delay * self._chip_rate))
+ degree = int(math.ceil(math.log(min_chips)/math.log(2)))
+ self._length = 2**degree-1
+
+ if self._verbose:
+ print "Actual chip rate is", n2s(self._chip_rate), "chips/sec"
+ print "Resolution is", n2s(self._resolution), "sec"
+ print "Using specified maximum delay spread of", self._max_delay,
"sec"
+ print "Mininum sequence length needed is", n2s(min_chips), "chips"
+ print "Using PN sequence of degree", degree, "length", self._length
+
+ self.define_component("s2v", gr.stream_to_vector(gr.sizeof_gr_complex,
self._length))
+ window = (1.0,)*self._length
+ self.define_component("fft", gr.fft_vcc(self._length, True, window))
+ self.define_component("v2s", gr.vector_to_stream(gr.sizeof_gr_complex,
self._length))
+ self.define_component("sink", gr.file_sink(gr.sizeof_gr_complex,
"FFT.dat"))
+
+ self.connect("usrp", 0, "s2v", 0)
+ self.connect("s2v", 0, "fft", 0)
+ self.connect("fft", 0, "v2s", 0)
+ self.connect("v2s", 0, "sink", 0)
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_tx.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_tx.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/sounder_tx.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, usrp, eng_notation
+from usrp_sink import usrp_sink_c
+import math
+
+n2s = eng_notation.num_to_str
+
+class sounder_tx(gr.hier_block2):
+ """
+ Creates a top-level channel sounder block with the given parameters.
+ """
+
+ def __init__(self, subdev_spec, freq, cal, verbose, max_delay, chip_rate,
amplitude):
+
+ # Call hierarchical block constructor
+ # Top-level blocks have no inputs or outputs
+ gr.hier_block2.__init__(self,
+ "sounder_tx", # Block typename
+ gr.io_signature(0,0,0), # Input signature
+ gr.io_signature(0,0,0)) # Output signature
+ self._freq = freq
+ self._cal = cal
+ self._verbose = verbose
+ self._max_delay = max_delay
+
+ self._u = usrp_sink_c(0, subdev_spec, chip_rate, self._freq,
self._cal, verbose)
+ self._chip_rate = self._u._if_rate
+ self._resolution = 1.0/self._chip_rate
+
+ min_chips = int(math.ceil(2.0*self._max_delay * self._chip_rate))
+ degree = int(math.ceil(math.log(min_chips)/math.log(2)))
+ self._length = 2**degree-1
+
+ self._glfsr = gr.glfsr_source_b(degree)
+ self._mapper = gr.chunks_to_symbols_bc((-amplitude+0j, amplitude+0j),
1)
+
+ if self._verbose:
+ print "Actual chip rate is", n2s(self._chip_rate), "chips/sec"
+ print "Resolution is", n2s(self._resolution), "sec"
+ print "Using specified maximum delay spread of", self._max_delay,
"sec"
+ print "Mininum sequence length needed is", n2s(min_chips), "chips"
+ print "Using PN sequence of degree", degree, "length", self._length
+ print "Output amplitude is", amplitude
+
+ self.define_component("glfsr", self._glfsr)
+ self.define_component("mapper", self._mapper)
+ self.define_component("usrp", self._u)
+ self.connect("glfsr", 0, "mapper", 0)
+ self.connect("mapper", 0, "usrp", 0)
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sink.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sink.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sink.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, usrp, eng_notation
+n2s = eng_notation.num_to_str
+
+# Hierarchical block implementing a USRP sink for complex floats,
+# with convenience functions for tuning, interpolation, etc.
+#
+class usrp_sink_c(gr.hier_block2):
+ """
+ Create a USRP sink object accepting complex floats.
+ """
+ def __init__(self, which=0, subdev_spec=None, if_rate=None,
+ freq=0.0, calibration=0.0, verbose=False):
+ # Call hierarchical block constructor
+ gr.hier_block2.__init__(self,
+ "usrp_sink_c", #
Block typename
+ gr.io_signature(1,1,gr.sizeof_gr_complex), #
Input signature
+ gr.io_signature(0,0,0)) #
Output signature
+
+ self._verbose = verbose
+ self._u = usrp.sink_c(which)
+ if self._verbose:
+ print 'DAC sample rate is', n2s(self._u.dac_rate()), "sps"
+ self.set_subdev(subdev_spec)
+ self.set_if_rate(if_rate)
+ self.set_calibration(calibration)
+ self.tune(freq)
+
+ self.define_component("usrp", self._u)
+ self.connect("self", 0, "usrp", 0)
+
+
+ def set_subdev(self, subdev_spec):
+ if subdev_spec is None:
+ subdev_spec = self.pick_subdevice()
+ self._subdev = usrp.selected_subdev(self._u, subdev_spec)
+ self._u.set_mux(usrp.determine_tx_mux_value(self._u, subdev_spec))
+ if self._verbose:
+ print 'TX using', self._subdev.name(), 'daughterboard'
+
+ def pick_subdevice(self):
+ """
+ The user didn't specify a subdevice.
+ If there's a daughterboard on A, select A.
+ If there's a daughterboard on B, select B.
+ Otherwise, select A.
+ """
+ if self._u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no
d'board or a problem
+ return (0, 0)
+ if self._u.db[1][0].dbid() >= 0:
+ return (1, 0)
+ return (0, 0)
+
+ def set_if_rate(self, if_rate):
+ # If no IF rate specified, set to maximum interpolation
+ if if_rate is None:
+ self._interp = 512
+ else:
+ self._interp = 4*int(self._u.dac_rate()/(4.0*if_rate)+0.5)
+
+
+ self._if_rate = self._u.dac_rate()/self._interp
+ self._u.set_interp_rate(self._interp)
+
+ if self._verbose:
+ print "USRP interpolation rate is", self._interp
+ print "USRP IF rate is", n2s(self._if_rate), "sps"
+
+ def set_calibration(self, calibration):
+ self._cal = calibration
+ if self._verbose:
+ print "Using frequency calibration offset of", n2s(calibration),
"Hz"
+
+ def tune(self, freq):
+ """
+ Set the center frequency we're interested in.
+
+ @param target_freq: frequency in Hz
+ @type: bool
+
+ Tuning is a two step process. First we ask the front-end to
+ tune as close to the desired frequency as it can. Then we use
+ the result of that operation and our target_frequency to
+ determine the value for the digital down converter.
+ """
+ self._tune_result = usrp.tune(self._u, 0, self._subdev, freq+self._cal)
+ if self._tune_result:
+ if self._verbose:
+ print "Baseband frequency is",
n2s(self._tune_result.baseband_freq), "Hz"
+ print "DXC frequency is", n2s(self._tune_result.dxc_freq), "Hz"
+ print "Center frequency is", n2s(freq), "Hz"
+ print "Residual frequency is",
n2s(self._tune_result.residual_freq), "Hz"
+ return True
+
+ return False
+
+if __name__ == '__main__':
+ sink = usrp_sink_c(verbose=True)
+
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from sounder_rx import sounder_rx
+
+def main():
+ parser = OptionParser(option_class=eng_option)
+
+ # Receive path options
+ parser.add_option("-R", "--rx-subdev-spec", type="subdev",
default=None,
+ help="select USRP Rx side A or B (default=first
found)")
+ parser.add_option("-f", "--freq", type="eng_float", default=0.0,
+ help="set center frequency (default=%default)")
+ parser.add_option("-c", "--cal", type="eng_float", default=0.0,
+ help="set frequency calibration offset
(default=%default)")
+ parser.add_option("-v", "--verbose", action="store_true", default=False,
+ help="print extra debugging info")
+ parser.add_option("-d", "--max-delay", type="eng_float", default=10e-6,
+ help="set maximum delay spread (default=%default)")
+ parser.add_option("-r", "--chip-rate", type="eng_float", default=8e6,
+ help="set sounder chip rate (default=%default)")
+ parser.add_option("-g", "--gain", type="eng_float", default=None,
+ help="set output amplitude (default=%default)")
+ (options, args) = parser.parse_args()
+
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ # Create an instance of a hierarchical block
+ top_block = sounder_rx(options.rx_subdev_spec, options.freq,
options.cal,
+ options.verbose, options.max_delay,
options.chip_rate,
+ options.gain)
+
+ # Create an instance of a runtime, passing it the top block
+ # to process
+ runtime = gr.runtime(top_block)
+
+ try:
+ # Run forever
+ runtime.run()
+ except KeyboardInterrupt:
+ # Ctrl-C exits
+ pass
+
+if __name__ == '__main__':
+ main ()
Property changes on:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
___________________________________________________________________
Name: svn:executable
+ *
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from sounder_tx import sounder_tx
+
+def main():
+ parser = OptionParser(option_class=eng_option)
+
+ # Transmit path options
+ parser.add_option("-T", "--tx-subdev-spec", type="subdev",
default=None,
+ help="select USRP Rx side A or B (default=first
found)")
+ parser.add_option("-f", "--freq", type="eng_float", default=0.0,
+ help="set center frequency (default=%default)")
+ parser.add_option("-c", "--cal", type="eng_float", default=0.0,
+ help="set frequency calibration offset
(default=%default)")
+ parser.add_option("-v", "--verbose", action="store_true", default=False,
+ help="print extra debugging info")
+ parser.add_option("-d", "--max-delay", type="eng_float", default=10e-6,
+ help="set maximum delay spread (default=%default)")
+ parser.add_option("-r", "--chip-rate", type="eng_float", default=8e6,
+ help="set sounder chip rate (default=%default)")
+ parser.add_option("-g", "--amplitude", type="eng_float",
default=32000.0,
+ help="set output amplitude (default=%default)")
+ (options, args) = parser.parse_args()
+
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ # Create an instance of a hierarchical block
+ top_block = sounder_tx(options.tx_subdev_spec, options.freq,
options.cal,
+ options.verbose, options.max_delay,
options.chip_rate,
+ options.amplitude)
+
+ # Create an instance of a runtime, passing it the top block
+ # to process
+ runtime = gr.runtime(top_block)
+
+ try:
+ # Run forever
+ runtime.run()
+ except KeyboardInterrupt:
+ # Ctrl-C exits
+ pass
+
+if __name__ == '__main__':
+ main ()
Property changes on:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
___________________________________________________________________
Name: svn:executable
+ *
Added:
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_source.py
===================================================================
---
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_source.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/est/gnuradio-examples/python/hier/sounder/usrp_source.py
2007-02-28 22:55:10 UTC (rev 4672)
@@ -0,0 +1,126 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, usrp, eng_notation
+n2s = eng_notation.num_to_str
+
+# Hierarchical block implementing a USRP source for complex floats,
+# with convenience functions for gain, tune, decimation, etc.
+#
+class usrp_source_c(gr.hier_block2):
+ """
+ Create a USRP source object supplying complex floats.
+ """
+ def __init__(self, which=0, subdev_spec=None, gain=None, if_rate=None,
+ freq=0.0, calibration=0.0, verbose=False):
+ # Call hierarchical block constructor
+ gr.hier_block2.__init__(self,
+ "usrp_source_c", #
Block typename
+ gr.io_signature(0,0,0), #
Input signature
+ gr.io_signature(1,1,gr.sizeof_gr_complex)) #
Output signature
+
+ self._verbose = verbose
+ self._u = usrp.source_c(which)
+ if self._verbose:
+ print 'ADC sample rate is', n2s(self._u.adc_rate()), "sps"
+ self.set_subdev(subdev_spec)
+ self.set_if_rate(if_rate)
+ self.set_gain(gain)
+ self.set_calibration(calibration)
+ self.tune(freq)
+
+ self.define_component("usrp", self._u)
+ self.connect("usrp", 0, "self", 0)
+
+ def set_subdev(self, subdev_spec):
+ if subdev_spec is None:
+ subdev_spec = self.pick_subdevice()
+ self._subdev = usrp.selected_subdev(self._u, subdev_spec)
+ self._u.set_mux(usrp.determine_rx_mux_value(self._u, subdev_spec))
+ if self._verbose:
+ print 'RX using', self._subdev.name(), 'daughterboard'
+
+ def pick_subdevice(self):
+ """
+ The user didn't specify a subdevice.
+ If there's a daughterboard on A, select A.
+ If there's a daughterboard on B, select B.
+ Otherwise, select A.
+ """
+ if self._u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no
d'board or a problem
+ return (0, 0)
+ if self._u.db[1][0].dbid() >= 0:
+ return (1, 0)
+ return (0, 0)
+
+ def set_if_rate(self, if_rate):
+ # If no IF rate specified, set to maximum decimation
+ if if_rate is None:
+ self._decim = 256
+ else:
+ self._decim = int(self._u.adc_rate()/if_rate)
+
+ self._u.set_decim_rate(self._decim)
+ self._if_rate = self._u.adc_rate()/self._decim
+
+ if self._verbose:
+ print "USRP decimation rate is", self._decim
+ print "USRP IF rate is", n2s(self._if_rate), "sps"
+
+ def set_gain(self, gain):
+ # If no gain specified, set to midrange
+ if gain is None:
+ g = self._subdev.gain_range()
+ gain = (g[0]+g[1])/2.0
+ self._gain = gain
+ self._subdev.set_gain(self._gain)
+
+ def set_calibration(self, calibration):
+ self._cal = calibration
+ if self._verbose:
+ print "Using frequency calibration offset of", n2s(calibration),
"Hz"
+
+ def tune(self, freq):
+ """
+ Set the center frequency we're interested in.
+
+ @param target_freq: frequency in Hz
+ @type: bool
+
+ Tuning is a two step process. First we ask the front-end to
+ tune as close to the desired frequency as it can. Then we use
+ the result of that operation and our target_frequency to
+ determine the value for the digital down converter.
+ """
+ self._tune_result = usrp.tune(self._u, 0, self._subdev, freq+self._cal)
+ if self._tune_result:
+ if self._verbose:
+ print "Baseband frequency is",
n2s(self._tune_result.baseband_freq), "Hz"
+ print "DXC frequency is", n2s(self._tune_result.dxc_freq), "Hz"
+ print "Center frequency is", n2s(freq), "Hz"
+ print "Residual frequency is",
n2s(self._tune_result.residual_freq), "Hz"
+ return True
+
+ return False
+
+if __name__ == '__main__':
+ src = usrp_source_c(verbose=True)
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