75 lines
2.7 KiB
Python
75 lines
2.7 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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# Anik Stark <anik.stark@psi.ch>
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# *****************************************************************************
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from frappy.core import StringIO, HasIO, Writable, Parameter, FloatRange, IntRange, \
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IDLE, ERROR
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from frappy.errors import CommunicationFailedError
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class IO(StringIO):
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end_of_line = '\n'
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identification = [('id', 'dilhtr.*')]
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default_settings = {'baudrate': 9600}
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class Heater(HasIO, Writable):
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ioClass = IO # define IO class for automatic creation of the IO module
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target = Parameter('power target value', FloatRange(0, 6e6, unit='W'), readonly=False)
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value = Parameter('power reading', FloatRange(unit='W'))
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resistance = Parameter('resistance reading', FloatRange(unit='Ohm'))
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current = Parameter('curren reading', FloatRange(unit='A'))
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voltage = Parameter('voltage reading', FloatRange(unit='V'))
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range = Parameter('range reading', IntRange(1, 3))
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status_map = {'0' : (IDLE, ''),
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'1' : (ERROR, 'short circuit'),
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'2' : (ERROR, 'open circuit')}
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def request(self, code):
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reply, txtvalue = self.communicate(f'{code}').split('=')
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if reply != code:
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raise CommunicationFailedError(f'bad reply: {reply}')
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return float(txtvalue)
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def write_target(self, target):
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self.communicate(f'p={target * 1e6}') # W to uW
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def read_value(self):
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return self.request('pr') * 1e-6 # uW to W
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def read_resistance(self):
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return self.request('r')
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def read_current(self):
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return self.request('i') * 1e-3 # mA to A
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def read_voltage(self):
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return self.request('v') * 1e-3 # mV to V
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def read_range(self):
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return int(self.request('k'))
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def read_status(self):
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reply, status = self.communicate('h').split('=')
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if reply != 'h':
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raise CommunicationFailedError(f'bad reply from status request: {reply}')
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return self.status_map.get(status, (ERROR, 'bad status'))
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