202 lines
6.7 KiB
C++
202 lines
6.7 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2020 <janvi@veith.net>
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* Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <array>
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#include <vector>
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#include <string>
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/**
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* E-Values derived from a geometric sequence formula by Charles Renard were already
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* accepted and widely used before the ISO recommendation no. 3 has been published.
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* For this historical reason, rounding rules of some values are sometimes irregular.
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* Although all E-Values could be calculated at runtime, we initialize them in a lookup table
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* what seems the most easy way to consider any inconvenient irregular rules. Same table is
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* also used to lookup non calculable but readable BOM value strings. Supported E-series are:
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*/
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// List of normalized values between 1 and 10
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// The terminal 0.0 value is a end of list value
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// Note also due to calculation time the E24 serie is the biggest usable.
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#define E24_VALUES 1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.7, 3.0,\
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3.3, 3.6, 3.9, 4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1, 0.0
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#define E12_VALUES 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2, 0.0
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#define E6_VALUES 1.0, 1.5, 2.2, 3.3, 4.7, 6.8, 0.0
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#define E3_VALUES 1.0, 2.2, 4.7, 0.0
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#define E1_VALUES 1.0, 0.0
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// First value of resistor in ohm
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#define FIRST_VALUE 10
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// last value of resistor in ohm
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#define LAST_VALUE 1e6
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/**
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* List of handled E series values:
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* Note: series bigger than E24 have no interest because
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* - probably the user will fing the needed value inside these series
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* - the calculation time can be *very high* for series > E24
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*/
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enum { E1, E3, E6, E12, E24 };
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/**
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* This calculator suggests solutions for 2R, 3R and 4R replacement combinations
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*/
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enum { S2R, S3R, S4R };
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// R_DATA handles a resistor: string value, value and allowed to use
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struct R_DATA
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{
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R_DATA() :
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e_use( true ),
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e_value( 0.0 )
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{}
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R_DATA( const std::string& aName, double aValue )
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{
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e_use = true;
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e_name = aName;
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e_value = aValue;
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}
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bool e_use;
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std::string e_name;
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double e_value;
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};
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class E_SERIE
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{
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public:
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E_SERIE();
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/**
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* If any value of the selected E-serie not available, it can be entered as an exclude value.
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*
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* @param aValue is the value to exclude from calculation
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* Values to exclude are set to false in the selected E-serie source lookup table
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*/
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void Exclude( double aValue );
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/**
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* initialize next calculation and erase results from previous calculation
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*/
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void NewCalc();
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/**
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* called on calculate button to execute all the 2R, 3R and 4R calculations
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*/
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void Calculate();
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/**
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* Interface for CheckBox, RadioButton, RequriedResistor and calculated Results
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*/
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void SetSeries( uint32_t aSeries ) { m_series = aSeries; }
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void SetRequiredValue( double aValue ) { m_required_value = aValue; }
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// Accessor:
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const std::array<R_DATA,S4R+1>& GetResults() { return m_results; }
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private:
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/**
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* Build the list of R_DATA existing for a given serie
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* Series are E1, E6 ..
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* The values are extracted from the E96_VALUES list
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* @return the count of items added in list
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*/
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int buildSerieData( int aEserie, double aList[] );
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/**
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* Build all 2R combinations from the selected E-serie values
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*
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* Pre-calculated value combinations are saved in intermediate look up table m_cmb_lut
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* @return is the number of found combinations what also depends from exclude values
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*/
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uint32_t combine2();
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/**
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* Search for closest two component solution
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*
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* @param aSize is the number of valid 2R combinations in m_cmb_lut on where to search
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* The 2R result with smallest deviation will be saved in results
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*/
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void simple_solution( uint32_t aSize );
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/**
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* Check if there is a better 3 R solution than previous one using only two components.
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*
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* @param aSize gives the number of available combinations to be checked inside m_cmb_lut
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* Therefore m_cmb_lut is combinated with the primary E-serie look up table
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* The 3R result with smallest deviation will be saved in results if better than 2R
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*/
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void combine3( uint32_t aSize );
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/**
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* Check if there is a better four component solution.
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*
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* @param aSsize gives the number of 2R combinations to be checked inside m_cmb_lut
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* Occupied calculation time depends from number of available E-serie values
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* with the power of 4 why execution for E12 is conditional with 4R check box
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* for the case the previously found 3R solution is already exact
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*/
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void combine4( uint32_t aSize );
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/*
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* Strip redundant braces from three component result
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*
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* Example: R1+(R2+R3) become R1+R2+R3
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* and R1|(R2|R3) become R1|R2|R3
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* while R1+(R2|R3) or (R1+R2)|R3) remains untouched
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*/
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void strip3();
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/*
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* Strip redundant braces from four component result
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*
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* Example: (R1+R2)+(R3+R4) become R1+R2+R3+R4
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* and (R1|R2)|(R2|R3) become R1|R2|R3|R4
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* while (R1+R2)|(R3+R4) remains untouched
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*/
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void strip4();
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private:
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std::vector<std::vector<R_DATA>> m_luts;
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/* Note: intermediate calculations use m_cmb_lut
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* if the biggest list is En, reserved array size should be 2*En*En of std::vector primary list.
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* 2 component combinations including redundant swappable terms are for the moment
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* ( using values between 10 ohms and 1Mohm )
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* 72 combinations for E1
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* 512 combinations for E3
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* 1922 combinations for E6
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* 7442 combinations for E12
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* 29282 combinations for E24
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*/
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std::vector<R_DATA> m_cmb_lut; // intermediate 2R combinations
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std::array<R_DATA, S4R+1> m_results; // 2R, 3R and 4R results
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uint32_t m_series = E6; // Radio Button State
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uint32_t m_enable_4R = false; // Check Box 4R enable
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double m_required_value = 0.0; // required Resistor
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};
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