mirror of https://github.com/ArduPilot/ardupilot
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file util.h
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* @brief Miscellaneous utility macros and procedures.
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*/
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#ifndef _UTIL_H_
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#define _UTIL_H_
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/*
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* Bit manipulation
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*/
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/** 1 << the bit number */
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#define BIT(shift) (1UL << (shift))
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/** Mask shifted left by 'shift' */
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#define BIT_MASK_SHIFT(mask, shift) ((mask) << (shift))
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/** Bits m to n of x */
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#define GET_BITS(x, m, n) ((((uint32)x) << (31 - (n))) >> ((31 - (n)) + (m)))
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/** True if v is a power of two (1, 2, 4, 8, ...) */
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#define IS_POWER_OF_TWO(v) ((v) && !((v) & ((v) - 1)))
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#endif
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