mirror of
https://github.com/RIOT-OS/RIOT.git
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f38f32f6cc
* fixed some jamfile isssues for msb-430 * fixed arch32 detection for scheduler * changed sht11 driver to be platform independent
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/**
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* Helper functions for bit arithmetic
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*
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* Copyright (C) 2010 Freie Universität Berlin
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*
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* This file subject to the terms and conditions of the GNU General Public
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* License. See the file LICENSE in the top level directory for more details.
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*
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* @defgroup bitarithm Bit Arithmetic
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* @ingroup lib
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* @{
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* @file
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* @author Freie Universität Berlin, Computer Systems & Telematics, FeuerWhere project
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* @author Kaspar Schleiser <kaspar.schleiser@fu-berlin.de>
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*/
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#ifndef BITARITHM_H_
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#define BITARITHM_H_
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#define BS(val, bit) ((val) & (bit))
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#define BS_COND(condition, target, mask) (target) ^= ( (-(condition) ^ (target)) & (mask) )
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#define SETBIT(val, bit) val |= (bit)
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#define CLRBIT(val, bit) val &= (~(bit))
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/**
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* @name Single Bit Defines
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* @{
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*/
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#ifndef BIT0
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#define BIT0 0x00000001
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#define BIT1 0x00000002
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#define BIT2 0x00000004
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#define BIT3 0x00000008
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#define BIT4 0x00000010
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#define BIT5 0x00000020
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#define BIT6 0x00000040
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#define BIT7 0x00000080
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#define BIT8 0x00000100
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#define BIT9 0x00000200
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#define BIT10 0x00000400
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#define BIT11 0x00000800
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#define BIT12 0x00001000
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#define BIT13 0x00002000
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#define BIT14 0x00004000
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#define BIT15 0x00008000
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#endif
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#ifndef BIT16
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#define BIT16 0x00010000
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#define BIT17 0x00020000
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#define BIT18 0x00040000
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#define BIT19 0x00080000
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#define BIT20 0x00100000
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#define BIT21 0x00200000
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#define BIT22 0x00400000
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#define BIT23 0x00800000
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#define BIT24 0x01000000
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#define BIT25 0x02000000
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#define BIT26 0x04000000
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#define BIT27 0x08000000
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#define BIT28 0x10000000
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#define BIT29 0x20000000
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#define BIT30 0x40000000
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#define BIT31 0x80000000
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#endif
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/** @} */
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#define ARCH_32_BIT (__INT_MAX__ == 2147483647)
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/**
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* @brief Returns the number of the highest '1' bit in a value
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* @param[in] v Input value
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* @return Bit Number
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*
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* Source: http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
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*/
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unsigned number_of_highest_bit(unsigned v);
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/**
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* @brief Returns the number of the lowest '1' bit in a value
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* @param[in] v Input value
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* @return Bit Number
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*
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* Source: http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
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*/
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unsigned number_of_lowest_bit(register unsigned v);
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/**
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* @brief Returns the number of bits set in a value
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* @param[in] v Input value
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* @return Number of set bits
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*
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* Source: http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
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*/
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unsigned number_of_bits_set(unsigned v);
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/**
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* @}
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*/
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#endif /* BITARITHM_H_ */
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