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mbin_polarise.c
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mbin_polarise.c
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/*-
* Copyright (c) 2008 Hans Petter Selasky
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdint.h>
#include "math_bin.h"
/*
* Functions for converting non-polar numbers into a polar number:
*
* +++++ -> -+-+-+-+ (neg_pol=0x5555) or +-+-+-+- (neg_pol=0xAAAA)
*
* When a bit in the "neg_pol" mask is one, the polarity becomes
* negative of that bit.
*/
uint32_t
mbin_polarise32(uint32_t val, uint32_t neg_pol)
{
return ((val + neg_pol) ^ neg_pol);
}
uint16_t
mbin_polarise16(uint16_t val, uint16_t neg_pol)
{
return ((val + neg_pol) ^ neg_pol);
}
uint8_t
mbin_polarise8(uint8_t val, uint8_t neg_pol)
{
return ((val + neg_pol) ^ neg_pol);
}