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README.md |
CORDIC Abs APFX
A free way to implement a CORDIC-based Complex Absolute Value using HLS, with bit-accurate precision.
Goal
CORDIC (COordinate Rotation DIgital Computer) is an efficient way to implement hardware complex rotations (e.g. z * exp(jw)
, with z = x + jy
a complex and w
a real angle). It also can be used to approximate the module of a complex. It is also useful for microcontrollers or microprocessors lacking floating-point units, as such multiplications can consume a noticeable amount of CPU cycles.
Indeed, |z| = sqrt(x² + y²) = |exp(-j*angle(z)) * z|
, thus the module of z
is the absolute value of the real part of its rotated version. So, ... CORDIC!
This implementation in C++14 (-std=c++14
) is suitable for hardware simulation and (with the right headers and maybe a few tweaks) for synthesis.
This repository defines one working CORDIC-based Absolute Value units class, CCordicAbs
.
Test suite and dependencies
The Catch2 test framework has been used in conjunction with CTest to provides unit tests.
- Has been tested successfully compiled with:
- GNU GCC 6.2 (Xilinx bundled version), 6.5, 9.4, 10.1, 10.2 and 11.2,
- LLVM Clang 12.0 and 13.0,
- Uses Catch v2.13.7,
- Depends on Xilinx HLS arbitrary precision types, available as FOSS here provided by Xilinx or here patched by myself. Note: Xilinx also provides proprietary versions of those headers, suitable for synthesis and implementation, bundled with their products.
A Xilinx C++ HLS testbench is also available, as well as a TCL script to run simulation, synthesis, co-simulation and IP export and implementation if wanted. Xilinx HLS v2020.2 can be directly called from CMake by the target run_hls
if the options ENABLE_TESTING
, ENABLE_XILINX
and COSIM_XILINX
are enabled. If CMake feels like black magic, It is advice to use tools like ccmake
(NCurses terminal interface to cmake) or cmake-gui
.
License and copyright
Copyright 2022 Camille "DrasLorus" Monière.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
A copy of the license is available here in Markdown or here in plain text.