kopia lustrzana https://github.com/OpenRTX/OpenRTX
288 wiersze
13 KiB
C
288 wiersze
13 KiB
C
/*
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*********************************************************************************************************
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* uC/LIB
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* Custom Library Modules
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*
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* Copyright 2004-2020 Silicon Laboratories Inc. www.silabs.com
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*
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* SPDX-License-Identifier: APACHE-2.0
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*
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* This software is subject to an open source license and is distributed by
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* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
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* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
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*
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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*
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* MATHEMATIC OPERATIONS
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*
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* Filename : lib_math.h
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* Version : V1.39.00
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*********************************************************************************************************
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* Note(s) : (1) NO compiler-supplied standard library functions are used in library or product software.
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*
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* (a) ALL standard library functions are implemented in the custom library modules :
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*
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* (1) \<Custom Library Directory>\lib_*.*
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*
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* (2) \<Custom Library Directory>\Ports\<cpu>\<compiler>\lib*_a.*
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*
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* where
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* <Custom Library Directory> directory path for custom library software
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* <cpu> directory name for specific processor (CPU)
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* <compiler> directory name for specific compiler
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*
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* (b) Product-specific library functions are implemented in individual products.
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*
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*********************************************************************************************************
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* Notice(s) : (1) The Institute of Electrical and Electronics Engineers and The Open Group, have given
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* us permission to reprint portions of their documentation. Portions of this text are
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* reprinted and reproduced in electronic form from the IEEE Std 1003.1, 2004 Edition,
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* Standard for Information Technology -- Portable Operating System Interface (POSIX),
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* The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute
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* of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
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* discrepancy between these versions and the original IEEE and The Open Group Standard,
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* the original IEEE and The Open Group Standard is the referee document. The original
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* Standard can be obtained online at http://www.opengroup.org/unix/online.html.
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* MODULE
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*
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* Note(s) : (1) This mathematics library header file is protected from multiple pre-processor inclusion
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* through use of the mathematics library module present pre-processor macro definition.
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*********************************************************************************************************
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*/
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#ifndef LIB_MATH_MODULE_PRESENT /* See Note #1. */
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#define LIB_MATH_MODULE_PRESENT
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/*
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*********************************************************************************************************
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* INCLUDE FILES
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*
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* Note(s) : (1) The custom library software files are located in the following directories :
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*
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* (a) \<Custom Library Directory>\lib_*.*
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*
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* where
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* <Custom Library Directory> directory path for custom library software
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*
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* (2) CPU-configuration software files are located in the following directories :
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*
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* (a) \<CPU-Compiler Directory>\cpu_*.*
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* (b) \<CPU-Compiler Directory>\<cpu>\<compiler>\cpu*.*
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*
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* where
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* <CPU-Compiler Directory> directory path for common CPU-compiler software
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* <cpu> directory name for specific processor (CPU)
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* <compiler> directory name for specific compiler
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*
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* (3) Compiler MUST be configured to include as additional include path directories :
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*
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* (a) '\<Custom Library Directory>\' directory See Note #1a
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*
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* (b) (1) '\<CPU-Compiler Directory>\' directory See Note #2a
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* (2) '\<CPU-Compiler Directory>\<cpu>\<compiler>\' directory See Note #2b
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*
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* (4) NO compiler-supplied standard library functions SHOULD be used.
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*********************************************************************************************************
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*/
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#include <cpu.h>
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#include <cpu_core.h>
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#include <lib_def.h>
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/*
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*********************************************************************************************************
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* EXTERNS
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*********************************************************************************************************
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*/
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#ifdef LIB_MATH_MODULE
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#define LIB_MATH_EXT
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#else
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#define LIB_MATH_EXT extern
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#endif
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/*
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*********************************************************************************************************
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* DEFINES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* RANDOM NUMBER DEFINES
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*
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* Note(s) : (1) (a) IEEE Std 1003.1, 2004 Edition, Section 'rand() : DESCRIPTION' states that "if rand()
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* is called before any calls to srand() are made, the same sequence shall be generated
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* as when srand() is first called with a seed value of 1".
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*
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* (b) (1) BSD/ANSI-C implements rand() as a Linear Congruential Generator (LCG) :
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*
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* (A) random_number = [(a * random_number ) + b] modulo m
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* n + 1 n
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*
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* where
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* (1) (a) random_number Next random number to generate
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* n+1
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* (b) random_number Previous random number generated
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* n
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* (c) random_number Initial random number seed
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* 0 See also Note #1a
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*
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* (2) a = 1103515245 LCG multiplier
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* (3) b = 12345 LCG incrementor
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* (4) m = RAND_MAX + 1 LCG modulus See also Note #1b2
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*
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* (2) (A) IEEE Std 1003.1, 2004 Edition, Section 'rand() : DESCRIPTION' states that
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* "rand() ... shall compute a sequence of pseudo-random integers in the range
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* [0, {RAND_MAX}] with a period of at least 2^32".
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*
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* (B) However, BSD/ANSI-C 'stdlib.h' defines "RAND_MAX" as "0x7fffffff", or 2^31;
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* which therefore limits the range AND period to no more than 2^31.
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*********************************************************************************************************
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*/
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#define RAND_SEED_INIT_VAL 1u /* See Note #1a. */
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#define RAND_LCG_PARAM_M 0x7FFFFFFFu /* See Note #1b2B. */
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#define RAND_LCG_PARAM_A 1103515245u /* See Note #1b1A2. */
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#define RAND_LCG_PARAM_B 12345u /* See Note #1b1A3. */
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/*
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*********************************************************************************************************
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* DATA TYPES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* RANDOM NUMBER DATA TYPE
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*********************************************************************************************************
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*/
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typedef CPU_INT32U RAND_NBR;
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/*
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*********************************************************************************************************
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* GLOBAL VARIABLES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* MACROS
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* MATH_IS_PWR2()
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*
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* Description : Determine if a value is a power of 2.
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*
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* Argument(s) : nbr Value.
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*
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* Return(s) : DEF_YES, 'nbr' is a power of 2.
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*
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* DEF_NO, 'nbr' is not a power of 2.
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*
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* Caller(s) : Application.
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*
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* Note(s) : none.
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*********************************************************************************************************
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*/
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#define MATH_IS_PWR2(nbr) ((((nbr) != 0u) && (((nbr) & ((nbr) - 1u)) == 0u)) ? DEF_YES : DEF_NO)
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/*
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*********************************************************************************************************
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* MATH_ROUND_INC_UP_PWR2()
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*
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* Description : Round value up to the next (power of 2) increment.
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*
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* Argument(s) : nbr Value to round.
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*
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* inc Increment to use. MUST be a power of 2.
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*
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* Return(s) : Rounded up value.
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*
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* Caller(s) : Application.
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*
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* Note(s) : none.
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*********************************************************************************************************
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*/
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#define MATH_ROUND_INC_UP_PWR2(nbr, inc) (((nbr) & ~((inc) - 1)) + (((nbr) & ((inc) - 1)) == 0 ? 0 : (inc)))
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/*
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*********************************************************************************************************
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* MATH_ROUND_INC_UP()
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*
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* Description : Round value up to the next increment.
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*
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* Argument(s) : nbr Value to round.
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*
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* inc Increment to use.
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*
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* Return(s) : Rounded up value.
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*
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* Caller(s) : Application.
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*
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* Note(s) : none.
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*********************************************************************************************************
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*/
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#define MATH_ROUND_INC_UP(nbr, inc) (((nbr) + ((inc) - 1)) / (inc) * (inc))
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/*
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*********************************************************************************************************
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* FUNCTION PROTOTYPES
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*********************************************************************************************************
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*/
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void Math_Init (void);
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/* ------------------ RAND NBR FNCTS ------------------ */
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void Math_RandSetSeed(RAND_NBR seed);
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RAND_NBR Math_Rand (void);
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RAND_NBR Math_RandSeed (RAND_NBR seed);
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/*
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*********************************************************************************************************
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* CONFIGURATION ERRORS
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* MODULE END
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*
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* Note(s) : (1) See 'lib_math.h MODULE'.
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*********************************************************************************************************
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*/
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#endif /* End of lib math module include. */
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