Merged r4429:4857 from developer branch jcorgan/dect into trunk, passes distcheck.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4858 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 126 insertions, 0 deletions

diff --git a/gnuradio-examples/python/hier/dect/usrp_source.py b/gnuradio-examples/python/hier/dect/usrp_source.py
new file mode 100644
index 000000000..16949998b
--- /dev/null
+++ b/gnuradio-examples/python/hier/dect/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)