Markus Zolliker
7333ccd7a6
this is an example where StringIO.communicate has to be extended Change-Id: Iff6bb426ee7960904993574531de84793152e21d Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/32385 Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
# *****************************************************************************
|
|
# 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>
|
|
# *****************************************************************************
|
|
"""pfeiffer TPG vacuum pressure reading"""
|
|
|
|
from frappy.core import StringIO, HasIO, IntRange, \
|
|
IDLE, WARN, ERROR, Readable, Parameter, Property
|
|
from frappy.errors import CommunicationFailedError
|
|
|
|
ACK = '\x06'
|
|
ENQ = '\x05'
|
|
|
|
|
|
class IO(StringIO):
|
|
end_of_line = '\r\n'
|
|
default_settings = {'baudrate': 9600}
|
|
|
|
def communicate(self, command, noreply=False):
|
|
with self._lock:
|
|
ack = super().communicate(command)
|
|
if ack != ACK:
|
|
raise CommunicationFailedError('no ack received')
|
|
if noreply:
|
|
# to be used for changing parameters when needed
|
|
return None
|
|
return super().communicate(ENQ)
|
|
|
|
|
|
class Pressure(HasIO, Readable):
|
|
value = Parameter(unit='mbar')
|
|
channel = Property('channel number', IntRange(1, 2), default=1)
|
|
|
|
STATUS_MAP = {
|
|
'0': (IDLE, ''),
|
|
'1': (WARN, 'underrange'),
|
|
'2': (WARN, 'overrange'),
|
|
'3': (ERROR, 'sensor error'),
|
|
'4': (ERROR, 'sensor off'),
|
|
'5': (ERROR, 'no sensor'),
|
|
'6': (ERROR, 'identification error'),
|
|
}
|
|
|
|
ioClass = IO
|
|
|
|
def read_value(self):
|
|
reply = self.communicate(f'PR{self.channel}')
|
|
status, strvalue = reply.split(',')
|
|
self.status = self.STATUS_MAP.get(status, (ERROR, 'bad status'))
|
|
return float(strvalue)
|