kicad/pcb_calculator/eserie.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2020 <janvi@veith.net>
* Copyright (C) 2020-2022 KiCad Developers, see AUTHORS.txt for contributors.
*
* 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 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <array>
#include <vector>
#include <string>
#include <cstdint>
/**
* E-Values derived from a geometric sequence formula by Charles Renard were already
* accepted and widely used before the ISO recommendation no. 3 has been published.
* For this historical reason, rounding rules of some values are sometimes irregular.
* Although all E-Values could be calculated at runtime, we initialize them in a lookup table
* what seems the most easy way to consider any inconvenient irregular rules. Same table is
* also used to lookup non calculable but readable BOM value strings. Supported E-series are:
*/
// List of normalized values between 1 and 10
// The terminal 0.0 value is a end of list value
// Note also due to calculation time the E24 serie is the biggest usable.
#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,\
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
#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
#define E6_VALUES 1.0, 1.5, 2.2, 3.3, 4.7, 6.8, 0.0
#define E3_VALUES 1.0, 2.2, 4.7, 0.0
#define E1_VALUES 1.0, 0.0
// First value of resistor in ohm
#define FIRST_VALUE 10
// last value of resistor in ohm
#define LAST_VALUE 1e6
/**
* List of handled E series values:
* Note: series bigger than E24 have no interest because
* - probably the user will fing the needed value inside these series
* - the calculation time can be *very high* for series > E24
*/
enum { E1, E3, E6, E12, E24 };
/**
* This calculator suggests solutions for 2R, 3R and 4R replacement combinations
*/
enum { S2R, S3R, S4R };
// R_DATA handles a resistor: string value, value and allowed to use
struct R_DATA
{
R_DATA() :
e_use( true ),
e_value( 0.0 )
{}
R_DATA( const std::string& aName, double aValue )
{
e_use = true;
e_name = aName;
e_value = aValue;
}
bool e_use;
std::string e_name;
double e_value;
};
class E_SERIE
{
public:
E_SERIE();
/**
* If any value of the selected E-serie not available, it can be entered as an exclude value.
*
* @param aValue is the value to exclude from calculation
* Values to exclude are set to false in the selected E-serie source lookup table
*/
void Exclude( double aValue );
/**
* initialize next calculation and erase results from previous calculation
*/
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void NewCalc();
/**
* called on calculate button to execute all the 2R, 3R and 4R calculations
*/
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void Calculate();
/**
* Interface for CheckBox, RadioButton, RequriedResistor and calculated Results
*/
void SetSeries( uint32_t aSeries ) { m_series = aSeries; }
void SetRequiredValue( double aValue ) { m_required_value = aValue; }
// Accessor:
const std::array<R_DATA,S4R+1>& GetResults() { return m_results; }
private:
/**
* Build the list of R_DATA existing for a given serie
* Series are E1, E6 ..
* The values are extracted from the E96_VALUES list
* @return the count of items added in list
*/
int buildSerieData( int aEserie, double aList[] );
/**
* Build all 2R combinations from the selected E-serie values
*
* Pre-calculated value combinations are saved in intermediate look up table m_cmb_lut
* @return is the number of found combinations what also depends from exclude values
*/
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uint32_t combine2();
/**
* Search for closest two component solution
*
* @param aSize is the number of valid 2R combinations in m_cmb_lut on where to search
* The 2R result with smallest deviation will be saved in results
*/
void simple_solution( uint32_t aSize );
/**
* Check if there is a better 3 R solution than previous one using only two components.
*
* @param aSize gives the number of available combinations to be checked inside m_cmb_lut
* Therefore m_cmb_lut is combinated with the primary E-serie look up table
* The 3R result with smallest deviation will be saved in results if better than 2R
*/
void combine3( uint32_t aSize );
/**
* Check if there is a better four component solution.
*
* @param aSsize gives the number of 2R combinations to be checked inside m_cmb_lut
* Occupied calculation time depends from number of available E-serie values
* with the power of 4 why execution for E12 is conditional with 4R check box
* for the case the previously found 3R solution is already exact
*/
void combine4( uint32_t aSize );
/*
* Strip redundant braces from three component result
*
* Example: R1+(R2+R3) become R1+R2+R3
* and R1|(R2|R3) become R1|R2|R3
* while R1+(R2|R3) or (R1+R2)|R3) remains untouched
*/
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void strip3();
/*
* Strip redundant braces from four component result
*
* Example: (R1+R2)+(R3+R4) become R1+R2+R3+R4
* and (R1|R2)|(R2|R3) become R1|R2|R3|R4
* while (R1+R2)|(R3+R4) remains untouched
*/
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void strip4();
private:
std::vector<std::vector<R_DATA>> m_luts;
/* Note: intermediate calculations use m_cmb_lut
* if the biggest list is En, reserved array size should be 2*En*En of std::vector primary list.
* 2 component combinations including redundant swappable terms are for the moment
* ( using values between 10 ohms and 1Mohm )
* 72 combinations for E1
* 512 combinations for E3
* 1922 combinations for E6
* 7442 combinations for E12
* 29282 combinations for E24
*/
std::vector<R_DATA> m_cmb_lut; // intermediate 2R combinations
std::array<R_DATA, S4R+1> m_results; // 2R, 3R and 4R results
uint32_t m_series = E6; // Radio Button State
uint32_t m_enable_4R = false; // Check Box 4R enable
double m_required_value = 0.0; // required Resistor
};