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# Copyright (C) 2015 Chintalagiri Shashank 

# 

# This file is part of Tendril. 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU Affero General Public License as published by 

# the Free Software Foundation, either version 3 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 Affero General Public License for more details. 

# 

# You should have received a copy of the GNU Affero General Public License 

# along with this program.  If not, see <http://www.gnu.org/licenses/>. 

""" 

This file is part of tendril 

See the COPYING, README, and INSTALL files for more information 

""" 

 

from math import fabs 

 

from tendril.utils import log 

logger = log.get_logger(__name__, log.DEFAULT) 

 

import iec60063 

 

from tendril.conventions.motifs.motifbase import MotifBase 

from tendril.conventions import electronics 

from tendril.gedaif import gsymlib 

 

 

class MotifLREGS1(MotifBase): 

    def __init__(self, identifier): 

        super(MotifLREGS1, self).__init__(identifier) 

        self._configdict = None 

 

    def get_configdict_stub(self): 

        stub = {'desc': 'Positive LDO Output Voltage Setter', 

                'regulator': '', 

                'Vref': '1.225V', 

                'Imin': '1mA', 

                'Rseries': 'E12', 

                'Rmin': '10E', 

                'Rmax': '10M'} 

        return stub 

 

    def configure(self, configdict): 

        self._configdict = configdict 

        self._autoset_r2() 

        self.Vout = configdict['Vout'] 

        self.validate() 

 

    def _autoset_r2(self): 

        r2_dev = self.get_elem_by_idx('R2').data['device'] 

        r2_fp = self.get_elem_by_idx('R2').data['footprint'] 

        if r2_fp[0:3] == "MY-": 

            r2_fp = r2_fp[3:] 

 

        allowed_res_vals = iec60063.gen_vals(self._configdict['Rseries'], 

                                             iec60063.res_ostrs, 

                                             self._configdict['Rmin'], 

                                             self._configdict['Rmax']) 

 

        required_res_val = fabs(self.Vref * 1000 / self.Imin) 

 

        rval = None 

        lastval = None 

        for val in allowed_res_vals: 

            lastval = rval 

            rval = electronics.parse_resistance(val) 

            if rval >= required_res_val: 

                self.get_elem_by_idx('R2').data['value'] = gsymlib.find_resistor(lastval, r2_fp, r2_dev)  # noqa 

                break 

 

    def validate(self): 

        logger.debug("Validating Motif : " + self.refdes) 

        logger.debug(" Vout: " + str(self.Vout) + 

                     " R2:" + str(self.R2) + 

                     " R1:" + str(self.R1)) 

 

    @property 

    def Vout(self): 

        return self.Vref * (1 + (self.R1 / self.R2)) 

 

    @Vout.setter 

    def Vout(self, value): 

        r1_dev = self.get_elem_by_idx('R1').data['device'] 

        r1_fp = self.get_elem_by_idx('R1').data['footprint'] 

        if r1_fp[0:3] == "MY-": 

            r1_fp = r1_fp[3:] 

 

        allowed_res_vals = iec60063.gen_vals(self._configdict['Rseries'], 

                                             iec60063.res_ostrs, 

                                             self._configdict['Rmin'], 

                                             self._configdict['Rmax']) 

 

        required_res_val = ((electronics.parse_voltage(value) / self.Vref) - 1) * self.R2  # noqa 

 

        rval = None 

        lastval = None 

        for val in allowed_res_vals: 

            lastval = rval 

            rval = electronics.parse_resistance(val) 

            if rval >= required_res_val: 

                self.get_elem_by_idx('R1').data['value'] = gsymlib.find_resistor(lastval, r1_fp, r1_dev)  # noqa 

                break 

 

    @property 

    def R1(self): 

        elem = self.get_elem_by_idx('R1') 

        assert elem.data['device'] in ['RES SMD', 'RES THRU'] 

        return electronics.parse_resistance(electronics.parse_resistor(elem.data['value'])[0])  # noqa 

 

    @property 

    def R2(self): 

        elem = self.get_elem_by_idx('R2') 

        assert elem.data['device'] in ['RES SMD', 'RES THRU'] 

        return electronics.parse_resistance(electronics.parse_resistor(elem.data['value'])[0])  # noqa 

 

    @property 

    def Vref(self): 

        return electronics.parse_voltage(self._configdict['Vref']) 

 

    @property 

    def Imin(self): 

        return electronics.parse_current(self._configdict['Imin']) 

 

    @property 

    def Il(self): 

        return self.Vref / self.R2 

 

    @property 

    def listing(self): 

        return [('Vout', self.Vout)]