Hide keyboard shortcuts

Hot-keys on this page

r m x p   toggle line displays

j k   next/prev highlighted chunk

0   (zero) top of page

1   (one) first highlighted chunk

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

# 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 

 

This file needs to be refactored quite a bit 

""" 

 

from math import pi 

 

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 MotifLPF1(MotifBase): 

    def __init__(self, identifier): 

        super(MotifLPF1, self).__init__(identifier) 

        self._configdict = None 

 

    def configure(self, configdict): 

        # Set Resistances 

 

        self.get_elem_by_idx('R1').data['value'] = electronics.construct_resistor(configdict['R1'], '0.125W')  # noqa 

 

        # Set Frequency 

        self._configdict = configdict 

        self.Fc = float(configdict['Fc'][:-2]) 

        self.validate() 

 

    @property 

    def Fc(self): 

        return (10 ** 9) / (2 * pi * float(self.R1) * float(self.C1)) 

 

    @Fc.setter 

    def Fc(self, value): 

        c1_dev = self.get_elem_by_idx('C1').data['device'] 

        c1_fp = self.get_elem_by_idx('C1').data['footprint'] 

        if c1_fp[0:3] == "MY-": 

            c1_fp = c1_fp[3:] 

 

        allowed_cap_vals = iec60063.gen_vals(self._configdict['Cseries'], 

                                             iec60063.cap_ostrs, 

                                             self._configdict['Cmin'], 

                                             self._configdict['Cmax']) 

 

        required_cap_val = (10 ** 9) / (2 * pi * float(self.R1) * value) 

 

        cval = None 

        for val in allowed_cap_vals: 

            lastval = cval 

            cval = electronics.parse_capacitance(val) 

            if cval >= required_cap_val: 

                self.get_elem_by_idx('C1').data['value'] = gsymlib.find_capacitor(lastval, c1_fp, c1_dev).value  # noqa 

                break 

 

        if cval is None: 

            raise ValueError 

 

    @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 C1(self): 

        elem = self.get_elem_by_idx('C1') 

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

        return electronics.parse_capacitance(electronics.parse_capacitor(elem.data['value'])[0])  # noqa 

 

    def validate(self): 

        pass 

 

    def get_configdict_stub(self): 

        stub = {'desc': "Simple Single Pole Low Pass Filter", 

                'Fc': "15000Hz", 

                'R1': "50E", 

                'Cseries': "E6", 'Cmin': "1pF", 'Cmax': "1uF", 

                } 

        return stub