SAMV71 Xplained Ultra Software Package 1.4

math.c

00001 /* ----------------------------------------------------------------------------
00002  *         SAM Software Package License
00003  * ----------------------------------------------------------------------------
00004  * Copyright (c) 2012, Atmel Corporation
00005  *
00006  * All rights reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions are met:
00010  *
00011  * - Redistributions of source code must retain the above copyright notice,
00012  * this list of conditions and the disclaimer below.
00013  *
00014  * Atmel's name may not be used to endorse or promote products derived from
00015  * this software without specific prior written permission.
00016  *
00017  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00019  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
00020  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00022  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
00023  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00024  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00025  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
00026  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  * ----------------------------------------------------------------------------
00028  */
00029 
00030 /*------------------------------------------------------------------------------
00031  *         Headers
00032  *----------------------------------------------------------------------------*/
00033 
00034 #include "board.h"
00035 
00036 /*------------------------------------------------------------------------------
00037  *         Exported functions
00038  *----------------------------------------------------------------------------*/
00039 
00040 /**
00041  *  Returns the minimum value between two integers.
00042  *
00043  *  \param a  First integer to compare.
00044  *  \param b  Second integer to compare.
00045  */
00046 extern uint32_t min( uint32_t dwA, uint32_t dwB )
00047 {
00048     if ( dwA < dwB ) {
00049         return dwA ;
00050     } else {
00051         return dwB ;
00052     }
00053 }
00054 
00055 /*------------------------------------------------------------------------------
00056  *  Returns the absolute value of an integer.
00057  *
00058  *  \param value  Integer value.
00059  *
00060  *  \note Do not call this function "abs", problem with gcc !
00061  */
00062 extern uint32_t absv( int32_t lValue )
00063 {
00064     if ( lValue < 0 ) {
00065         return -lValue ;
00066     } else {
00067         return lValue ;
00068     }
00069 }
00070 
00071 /*------------------------------------------------------------------------------
00072  *  Computes and returns x power of y.
00073  *
00074  *  \param x  Value.
00075  *  \param y  Power.
00076  */
00077 extern uint32_t power( uint32_t dwX, uint32_t dwY )
00078 {
00079     uint32_t dwResult = 1 ;
00080 
00081     while ( dwY > 0 ) {
00082         dwResult *= dwX ;
00083         dwY-- ;
00084     }
00085     return dwResult ;
00086 }
00087 
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