Rename from secop to frappy

debian/ is still missing, will follow in next commit.

Fixes: #4626

Change-Id: Ia87c28c1c75b8402eedbfca47f888585a7881f44

frappy_psi/ah2700.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+# 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:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""Andeen Hagerling capacitance bridge"""
+
+from frappy.core import Done, FloatRange, HasIO, Parameter, Readable, StringIO, nopoll
+
+
+class Ah2700IO(StringIO):
+    end_of_line = '\r\n'
+    timeout = 5
+
+
+class Capacitance(HasIO, Readable):
+
+    value = Parameter('capacitance', FloatRange(unit='pF'))
+    freq = Parameter('frequency', FloatRange(unit='Hz'), readonly=False, default=0)
+    voltage = Parameter('voltage', FloatRange(unit='V'), readonly=False, default=0)
+    loss = Parameter('loss', FloatRange(unit='deg'), default=0)
+
+    ioClass = Ah2700IO
+
+    def parse_reply(self, reply):
+        if reply.startswith('SI'):  # this is an echo
+            self.communicate('SERIAL ECHO OFF')
+            reply = self.communicate('SI')
+        if not reply.startswith('F='):  # this is probably an error message like "LOSS TOO HIGH"
+            self.status = [self.Status.ERROR, reply]
+            return
+        self.status = [self.Status.IDLE, '']
+        # examples of replies:
+        # 'F= 1000.0  HZ C= 0.000001    PF L> 0.0         DS V= 15.0     V'
+        # 'F= 1000.0  HZ C= 0.0000059   PF L=-0.4         DS V= 15.0     V OVEN'
+        # 'LOSS TOO HIGH'
+        # make sure there is always a space after '=' and '>'
+        # split() ignores multiple white space
+        reply = reply.replace('=', '= ').replace('>', '> ').split()
+        _, freq, _, _, cap, _, _, loss, lossunit, _, volt = reply[:11]
+        self.freq = freq
+        self.voltage = volt
+        self.value = cap
+        if lossunit == 'DS':
+            self.loss = loss
+        else:  # the unit was wrong, we want DS = tan(delta), not NS = nanoSiemens
+            reply = self.communicate('UN DS').split()  # UN DS returns a reply similar to SI
+            try:
+                self.loss = reply[7]
+            except IndexError:
+                pass  # don't worry, loss will be updated next time
+
+    def read_value(self):
+        self.parse_reply(self.communicate('SI'))  # SI = single trigger
+        return Done
+
+    @nopoll
+    def read_freq(self):
+        self.read_value()
+        return Done
+
+    @nopoll
+    def read_loss(self):
+        self.read_value()
+        return Done
+
+    @nopoll
+    def read_voltage(self):
+        self.read_value()
+        return Done
+
+    def write_freq(self, value):
+        self.parse_reply(self.communicate('FR %g;SI' % value))
+        return Done
+
+    def write_voltage(self, value):
+        self.parse_reply(self.communicate('V %g;SI' % value))
+        return Done