https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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- v2.6.20-rc4
- v2.6.20-rc3
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Tip revision: 8fe28cb58bcb235034b64cbbb7550a8a43fd88be authored by Linus Torvalds on 23 December 2018, 23:55:59 UTC
Linux 4.20
Linux 4.20
Tip revision: 8fe28cb
cordic.h
/*
* Copyright (c) 2011 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __CORDIC_H_
#define __CORDIC_H_
#include <linux/types.h>
/**
* struct cordic_iq - i/q coordinate.
*
* @i: real part of coordinate (in phase).
* @q: imaginary part of coordinate (quadrature).
*/
struct cordic_iq {
s32 i;
s32 q;
};
/**
* cordic_calc_iq() - calculates the i/q coordinate for given angle.
*
* @theta: angle in degrees for which i/q coordinate is to be calculated.
* @coord: function output parameter holding the i/q coordinate.
*
* The function calculates the i/q coordinate for a given angle using the
* CORDIC algorithm. The coordinate consists of a real (i) and an
* imaginary (q) part. The real part is essentially the cosine of the
* angle and the imaginary part is the sine of the angle. The returned
* values are scaled by 2^16 for precision. The range for theta is
* for -180 degrees to +180 degrees. Passed values outside this range are
* converted before doing the actual calculation.
*/
struct cordic_iq cordic_calc_iq(s32 theta);
#endif /* __CORDIC_H_ */