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diff --git a/gr-usrp/src/db_instantiator.py b/gr-usrp/src/db_instantiator.py
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+#
+# Copyright 2005 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., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+#
+
+_instantiator_map = {}
+
+def add(dbid, instantiator):
+ _instantiator_map[dbid] = instantiator
+
+def instantiate(usrp, which):
+ dbid = usrp.daughterboard_id(which)
+ if _instantiator_map.has_key(dbid):
+ return _instantiator_map[dbid](usrp, which)
+ raise ValueError, "No class defined to handle daughterboard (dbid = %d)" % (dbid,)