kicad/pcb_calculator/eseries.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/>.
*/
#pragma once
2021-10-10 15:03:24 +00:00
#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.
* The current list of values is recorded in IEC 60063:2015.
* Previously it was in IEC publication 63.
* 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.
*/
// The resistor calculator cannot operate on series larger than E24 due to calculation time
// Values are stored in the 100-999 decade. This is so that all values are integers
// and can be stored precisely. If the values are real values with a fraction part then
// the fractional part is typically imprecisely stores. In the 100 decade the values
// can be stored as precise values in integers. If used in floating point types
// they are as precise as before
// If you want the values in the first decade then simply divide every value in
// the list by the first value in the list.
// E96 is a proper subset of E192. It is every 2nd value. E48 is every 4th value of E192.
// That is, all the series with 3 significant figures are subsets of the same series, E192.
// E24 is not a subset of E48 or E192. All series below E48 have only 2 significant figures
// and are differently from the series with 3 significant figures.
// E12, E6 and E3 are proper subsets of E24. Specifically they are evenly spaced
// values selected from E24. E12 is every 2nd value, E6 every 4th, E3 every 8th.
// E1 is not in the IEC standard.
// The value 0 is not present in any series. It does not fit in any decade.
// It must be special cased in any calcuation or method of selection of
// values.
namespace ESERIES
{
enum
{
E1,
E3,
E6,
E12,
E24,
E48,
E96,
E192
};
/* \brief Creates a vector of integers of E series values
*
*/
class ESERIES_VALUES : public std::vector<uint16_t>
{
public:
ESERIES_VALUES( int aESeries );
private:
static const std::vector<uint16_t> s_e24table;
static const std::vector<uint16_t> s_e192table;
};
/*! \brief Creates a vector of integers of the E1 series values.
*
*/
class E1_VALUES : public ESERIES_VALUES
{
public:
E1_VALUES() : ESERIES_VALUES( E1 ) {}
};
/*! \brief Creates a vector of integers of the E3 series values.
*
*/
class E3_VALUES : public ESERIES_VALUES
{
public:
E3_VALUES() : ESERIES_VALUES( E3 ) {}
};
/*! \brief Creates a vector of integers of the E6 series values.
*
*/
class E6_VALUES : public ESERIES_VALUES
{
public:
E6_VALUES() : ESERIES_VALUES( E6 ) {}
};
/*! \brief Creates a vector of integers of the E12 series values.
*
*/
class E12_VALUES : public ESERIES_VALUES
{
public:
E12_VALUES() : ESERIES_VALUES( E12 ) {}
};
/*! \brief Creates a vector of integers of the E24 series values.
*
*/
class E24_VALUES : public ESERIES_VALUES
{
public:
E24_VALUES() : ESERIES_VALUES( E24 ) {}
};
/*! \brief Creates a vector of integers of the E48 series values.
*
*/
class E48_VALUES : public ESERIES_VALUES
{
public:
E48_VALUES() : ESERIES_VALUES( E48 ) {}
};
/*! \brief Creates a vector of integers of the E96 series values.
*
*/
class E96_VALUES : public ESERIES_VALUES
{
public:
E96_VALUES() : ESERIES_VALUES( E96 ) {}
};
/*! \brief Creates a vector of integers of the E192 series values.
*
*/
class E192_VALUES : public ESERIES_VALUES
{
public:
E192_VALUES() : ESERIES_VALUES( E192 ) {}
};
/*! \brief Creates a vector of doubles of the values in the requested eseries and decade.
*
* The eSeries to select is a specified using the enumeration values above.
* The decade is specified as an integer exponent to the base 10.
* To receive vales between 100 and 1000 specify 2 as the exponent as each value will
* be normalized to betwen 1.0 and 10.0 and then multiplied by 10^2.
*/
class ESERIES_IN_DECADE : public std::vector<double>
{
public:
ESERIES_IN_DECADE( int eSeries, int decadeExponent );
};
} // namespace ESERIES