/* ---------------------------------------------------------------------------- | |
* SAM Software Package License | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2011, Atmel Corporation | |
* | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* - Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the disclaimer below. | |
* | |
* Atmel's name may not be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR | |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
* DISCLAIMED. IN NO EVENT SHALL ATMEL 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. | |
* ---------------------------------------------------------------------------- | |
*/ | |
/** \file */ | |
/*------------------------------------------------------------------------------ | |
* Header | |
*------------------------------------------------------------------------------*/ | |
#include "board.h" | |
#include "rand.h" | |
/*------------------------------------------------------------------------------ | |
* Global Variables | |
*------------------------------------------------------------------------------*/ | |
static uint32_t _dwRandNext = 1; | |
/*------------------------------------------------------------------------------ | |
* Exported Functions | |
*------------------------------------------------------------------------------*/ | |
/** | |
* Initialize the seed for rand generator. | |
* | |
* \param dwSeed rand initiation seed | |
*/ | |
void srand(uint32_t dwSeed) | |
{ | |
_dwRandNext = dwSeed; | |
} | |
/** | |
* Return a random number, maxinum assumed to be 65536 | |
*/ | |
uint32_t rand(void) | |
{ | |
_dwRandNext = _dwRandNext * 1103515245 + 12345; | |
return (uint32_t) (_dwRandNext / 131072) % 65536; | |
} |