add T forwarder for razorbill

frappy_psi/dummy.py

@@ -0,0 +1,44 @@
+# *****************************************************************************
+# This program 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 of the License, or (at your option) any later
+# version.
+#
+# This program 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
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Paul M. Neves <pmneves@mit.edu>
+# *****************************************************************************
+
+from frappy.core import Readable, Parameter, FloatRange, Module, Attached, Writable
+
+
+class Temp(Writable):
+    """a voltage output with loop"""
+
+    value = Parameter(unit='K', value=0)
+    target = Parameter('target voltage', FloatRange(0, 325, unit='K'),
+                       readonly=False)
+
+    def write_target(self, target):
+        self.value = target
+
+
+class Forwarder(Module):
+    """forward the values of a module to the target of another module"""
+    src = Attached(Readable, 'source module')
+    dst = Attached(Writable, 'destination module')
+
+    def initModule(self):
+        super().initModule()
+        self.src.registerCallbacks(self)
+
+    def update_value(self, value):
+        self.dst.write_target(value)