# *****************************************************************************
# 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:
#   Anik Stark <anik.stark@psi.ch>
# *****************************************************************************

from frappy.core import StringIO, HasIO, Readable, Parameter, Property, FloatRange


class IO(StringIO):
    end_of_line = '\r'
    identification = [('IDN*', '.*')]       # expected reply?
    default_settings = {'baudrate': 9600}


class Pressure(HasIO, Readable):

    ioClass = IO

    value = Parameter('pressure', datatype=FloatRange(unit='mbar'))
    scale = Property('global scale factor', datatype=FloatRange(), default=1)

    def read_value(self):
        return float(self.communicate('PRES?')) / self.scale       # any other reply?
