adopt frappy_psi and frappy changes from wip

Change-Id: I4e6732e755398d88b73007fb53b758039c5d4483

frappy_psi/bkpower.py

@@ -0,0 +1,67 @@
+# *****************************************************************************
+# 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>
+#   Jael Celia Lorenzana <jael-celia.lorenzana@psi.ch>
+# *****************************************************************************
+"""Powersupply B&K Precision BK168xB"""
+
+from frappy.core import StringIO, Readable, Parameter, FloatRange, Writable, HasIO, BoolType
+
+class IO(StringIO):
+    end_of_line = ('OK\r', '\r')
+    default_settings = {'baudrate': 9600}
+    
+    
+class Power(HasIO, Readable):
+    value = Parameter(datatype=FloatRange(0,300,unit='W'))
+    
+    def read_value(self):
+        reply = self.communicate('GETD')
+        volt = float(reply[0:4])/100
+        current = float(reply[4:8])/100
+        return volt*current
+
+    
+class Output(HasIO, Writable):
+    value = Parameter(datatype=FloatRange(0,100,unit='%'))
+    target = Parameter(datatype=FloatRange(0,100,unit='%'))
+    maxvolt = Parameter('voltage at 100%',datatype=FloatRange(0,60,unit='V'),default=50,readonly=False)
+    maxcurrent = Parameter('current at 100%',datatype=FloatRange(0,5,unit='A'),default=2,readonly=False)
+    output_enable = Parameter('control on/off', BoolType(), readonly=False)
+    
+    def initModule(self):
+        super().initModule()
+        self.write_output_enable(False)
+        
+    def write_target(self, target):
+        self.write_output_enable(target != 0)
+        self.communicate(f'VOLT{round(max(8,target*self.maxvolt/10)):03d}')
+        self.communicate(f'CURR{round(target*self.maxcurrent):03d}')
+        self.value = target
+        
+    def write_output_enable(self, value):
+        self.communicate(f'SOUT{int(not value)}')
+        
+    def write_maxvolt(self, maxvolt):
+        self.communicate(f'SOVP{round(maxvolt*10):03d}')
+        
+    def write_maxcurrent(self, maxcurrent):
+        self.communicate(f'SOCP{round(maxcurrent*100):03d}')
+        
+    def shutdown(self):
+        self.write_target(0)
+