From 19a5b154cc5c2cd5f80bcd17d71241572ca7fbd6 Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Fri, 2 Mar 2007 02:49:48 +0000
Subject: Merged r4671:4680 from jcorgan/est into trunk. Pulls in gr-wxgui
updates for new hierarchical blocks and work-in-progress channel sounder
example.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4681 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../python/hier/sounder/usrp_source.py | 126 +++++++++++++++++++++
1 file changed, 126 insertions(+)
create mode 100644 gnuradio-examples/python/hier/sounder/usrp_source.py
(limited to 'gnuradio-examples/python/hier/sounder/usrp_source.py')
diff --git a/gnuradio-examples/python/hier/sounder/usrp_source.py b/gnuradio-examples/python/hier/sounder/usrp_source.py
new file mode 100644
index 0000000000..16949998b8
--- /dev/null
+++ b/gnuradio-examples/python/hier/sounder/usrp_source.py
@@ -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)
--
cgit v1.2.3