mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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144 lines
3.2 KiB
C++
144 lines
3.2 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __COMPLEX_H__
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#define __COMPLEX_H__
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#include <cstdint>
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#include <complex>
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#include <cmath>
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#include <hal.h>
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constexpr float pi { 3.141592653589793238462643383279502884f };
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namespace std {
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template<> struct complex<int8_t> {
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public:
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typedef int8_t value_type;
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typedef uint16_t rep_type;
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// constexpr complex(
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// rep_type r
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// ) : _rep { r }
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// {
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// }
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constexpr complex(
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int8_t re = 0,
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int8_t im = 0
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) : _v { re, im }
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{
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}
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// constexpr complex(
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// const complex& o
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// ) : _rep { o._rep }
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// {
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// }
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constexpr int8_t real() const { return _v[0]; }
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constexpr int8_t imag() const { return _v[1]; }
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void real(int8_t v) { _v[0] = v; }
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void imag(int8_t v) { _v[1] = v; }
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constexpr uint16_t __rep() const {
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return _rep;
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}
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private:
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union {
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int8_t _v[2];
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uint16_t _rep;
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};
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};
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template<> struct complex<int16_t> {
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public:
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typedef int16_t value_type;
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typedef uint32_t rep_type;
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// constexpr complex(
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// rep_type r
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// ) : _rep { r }
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// {
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// }
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constexpr complex(
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int16_t re = 0,
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int16_t im = 0
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) : _v { re, im }
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{
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}
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// constexpr complex(
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// const complex& o
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// ) : _rep { o._rep }
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// {
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// }
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constexpr int16_t real() const { return _v[0]; }
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constexpr int16_t imag() const { return _v[1]; }
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void real(int16_t v) { _v[0] = v; }
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void imag(int16_t v) { _v[1] = v; }
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constexpr uint32_t __rep() const {
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return _rep;
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}
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private:
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union {
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int16_t _v[2];
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uint32_t _rep;
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};
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};
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} /* namespace std */
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using complex8_t = std::complex<int8_t>;
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using complex16_t = std::complex<int16_t>;
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using complex32_t = std::complex<int32_t>;
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static_assert(sizeof(complex8_t) == 2, "complex8_t size wrong");
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static_assert(sizeof(complex16_t) == 4, "complex16_t size wrong");
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static_assert(sizeof(complex32_t) == 8, "complex32_t size wrong");
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#if defined(LPC43XX_M4)
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static inline complex32_t multiply_conjugate_s16_s32(const complex16_t::rep_type a, const complex16_t::rep_type b) {
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// conjugate: conj(a + bj) = a - bj
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// multiply: (a + bj) * (c + dj) = (ac - bd) + (bc + ad)j
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// conjugate-multiply: (ac + bd) + (bc - ad)j
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//return { a.real() * b.real() + a.imag() * b.imag(), a.imag() * b.real() - a.real() * b.imag() };
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const int32_t rr = __SMULBB(a, b);
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const int32_t ii = __SMULTT(a, b);
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const int32_t r = __QADD(rr, ii);
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const int32_t ir = __SMULTB(a, b);
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const int32_t ri = __SMULBT(a, b);
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const int32_t i = __QSUB(ir, ri);
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return { r, i };
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}
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#endif
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#endif/*__COMPLEX_H__*/
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