add femto giga switch (untested)

frappy_psi/femtogsw.py

@@ -0,0 +1,53 @@
+# *****************************************************************************
+# 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:
+#   Marek Bartkowiak <marek.bartkowiak@psi.ch>
+# *****************************************************************************
+# Example configuration
+#IO('io_gain', 'serial:///dev/ttyUSB0?baudrate=115200')
+#
+#Mod('amplgain',
+#    'frappy_psi.femtogsw.Gain',
+#    'gainswitcher for FEMTO Amps',
+#    io='io_gain',
+#)
+#
+# Things to do:
+# the gain is set in units= 'dB' and allowed values are 20 30 40 50 60
+# Units are not allowed for IntRange
+
+"""Gainswitch for FEMTO-Amplifier"""
+
+from frappy.core import IntRange, HasIO, Parameter, StringIO, Writable
+
+
+class IO(StringIO):
+    end_of_line = '\n'
+    default_settings = {'baudrate':115200}
+
+
+class Gain(HasIO, Writable):
+    ioClass = IO
+    value = Parameter(datatype=IntRange(20,60,unit='dB'))
+    target = Parameter(datatype=IntRange(20,60,unit='dB'))
+
+    def read_value(self):
+        return int(self.communicate('R'))
+
+    def write_target(self, target):
+        self.communicate(f'W{target:2d}')
+        self.value = target
+