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https://github.com/DrasLorus/CORDIC_Rotate_APFX.git
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5bc9c3eeb1
- Commit title implies possible Xilinx Vivado HLS 2019.1 support, thus support for e.g. all USRP Series 3 from Ettus. - Add a new CORDIC version, Rom based and meta-programmed via CMake features, to be even compiled with earlier GCC (not quite tested, but by changing constexpr to const and using gcc 4.6 -sdt=c++0x, it worked). - Class name modified, to be more explicit.
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
/*
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*
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* Copyright 2022 Camille "DrasLorus" Monière.
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*
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* This file is part of CORDIC_Rotate_APFX.
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*
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* This program is free software: you can redistribute it and/or modify it under the terms of the GNU
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* Lesser General Public License as published by the Free Software Foundation, either version 3 of
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* the License, or (at your 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 WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with this program.
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* If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#ifndef C_CORDIC_ROTATE_HPP
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#define C_CORDIC_ROTATE_HPP
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#include <climits>
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#include <cmath>
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#include <cstdint>
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#include <cstdlib>
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#include <complex>
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#include <ap_fixed.h>
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#include <ap_int.h>
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template <uint8_t N_STAGES,
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class T,
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uint8_t ATAN_I>
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struct CAtanLUT {
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static constexpr double atanDbl[28] {
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0.78539816339745, 0.46364760900081, 0.24497866312686, 0.12435499454676,
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0.06241880999596, 0.03123983343027, 0.01562372862048, 0.00781234106010,
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0.00390623013197, 0.00195312251648, 0.00097656218956, 0.00048828121119,
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0.00024414062015, 0.00012207031189, 0.00006103515617, 0.00003051757812,
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0.00001525878906, 0.00000762939453, 0.00000381469727, 0.00000190734863,
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0.00000095367432, 0.00000047683716, 0.00000023841858, 0.00000011920929,
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0.00000005960464, 0.00000002980232, 0.00000001490116, 0.00000000745058};
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static_assert(N_STAGES < 28, "Not enough arctan available.");
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static_assert(N_STAGES <= ATAN_I, "ATAN_I can't be less than N_STAGES.");
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static_assert(std::is_integral<T>(), "Must be a standard C++ integer type.");
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constexpr CAtanLUT() : table() {
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for (uint8_t i = 0; i < N_STAGES; ++i) {
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const double scaled = atanDbl[i] * static_cast<double>(1 << ATAN_I) + 0.5;
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table[i] = static_cast<T>(scaled);
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}
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}
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T table[N_STAGES];
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};
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template <uint8_t N_STAGES,
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uint8_t TH_W,
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uint8_t TH_I,
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uint8_t IN_W,
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uint8_t IN_I,
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uint8_t OUT_W,
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uint8_t OUT_I,
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uint8_t ATAN_I>
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class CCordicRotateSmart {
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public:
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static constexpr const CAtanLUT<N_STAGES, uint64_t, ATAN_I> & atanLUT = CAtanLUT<N_STAGES, uint64_t, ATAN_I>();
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static void process(
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const ap_fixed<TH_W, TH_I> & fx_angle,
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const ap_fixed<IN_W, IN_I> & fx_re_in,
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const ap_fixed<IN_W, IN_I> & fx_im_in,
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ap_fixed<OUT_W, OUT_I> & fx_re_out,
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ap_fixed<OUT_W, OUT_I> & fx_im_out);
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CCordicRotateSmart() {}
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virtual ~CCordicRotateSmart() {};
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};
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#endif
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