61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Marcel Fuchs <marcel.fuchs@psi.ch>
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# *****************************************************************************
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"""
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Multiple waterbath switching
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"""
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from frappy.core import Readable, Writable, Parameter, Property, IntRange, Attached,ERROR, IDLE, WARN
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class Switcher(Writable):
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value = Parameter("Switcher state", IntRange(0,3))
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target = Parameter("Switcher target", IntRange(0,3), default=0)
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valve1 = Attached(Writable)
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valve2 = Attached(Writable)
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valve3 = Attached(Writable)
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_count = 0
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_idle_status = IDLE, ''
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def initModule(self):
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super().initModule()
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self.valves = {1:self.valve1, 2:self.valve2, 3:self.valve3}
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def write_target(self, target):
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for nr, valve in self.valves.items():
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if nr != target:
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valve.write_target(False)
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if target != 0:
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self.valves[target].write_target(True)
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self._idle_status = IDLE, ''
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def read_value(self):
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opened = [nr for nr, valve in self.valves.items() if valve.read_value()]
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self._count = len(opened)
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if self._count == 0:
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return 0
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if self._count == 1:
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return opened[0]
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self.write_target(self.target)
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self._idle_status = WARN, 'superfluous valves closed'
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return self.target
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def read_status(self):
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return self._idle_status
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