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f0035238bf
- Fix the MC (Monte-Carlo) to the proper algoritm name, ML (maximum likelyhood) and remove HalfPi since the use of divider allow to theoretically support any pi / 2^k, k an integer. In reality, a too low rotation would require more stages than 7 but it is for futur improvements. - Make use of `divider` template to provide rotation grain finer than pi / 2. Validated (unit-tested) with pi / 4 with the same margins than pi / 2 (2% of error with floating scaling, 3% with fixed scaling). - Fix rom size which now use N_STAGES+1 bits instead of 8 regardless of N_STAGES. Simplify the cordic method implementation, which unexpectedly (and fortunately) improved its performance.
36 lines
No EOL
1.3 KiB
C++
36 lines
No EOL
1.3 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_ROM_TEMPLATE
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#define C_CORDIC_ROTATE_ROM_TEMPLATE
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enum rom_types {
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ml,
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cst
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};
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template <unsigned TIn_I, rom_types type, unsigned TIn_W, unsigned Tnb_stages, unsigned Tq, unsigned divider = 2>
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class CCordicRotateRom {
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static_assert(TIn_W > 0, "Inputs can't be on zero bits.");
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static_assert(Tnb_stages < 8, "7 stages of CORDIC is the maximum supported.");
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static_assert(Tnb_stages > 1, "2 stages of CORDIC is the minimum.");
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static_assert(((divider - 1) & divider) == 0, "divider must be a power of 2.");
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};
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#endif // C_CORDIC_ROTATE_ROM_TEMPLATE
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