From 044ad7c3987460ede48ff27afd6bdb0ca05a0432 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 4 Jul 2011 20:52:54 +0200 Subject: import at91lib from at91lib_20100901_softpack_1_9_v_1_0_svn_v15011 it's sad to see that atmel doesn't publish their svn repo or has a centralized location or even puts proper version/release info into the library itself --- utility/rand.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 utility/rand.c (limited to 'utility/rand.c') diff --git a/utility/rand.c b/utility/rand.c new file mode 100644 index 0000000..a73e8d9 --- /dev/null +++ b/utility/rand.c @@ -0,0 +1,58 @@ +/* ---------------------------------------------------------------------------- + * ATMEL Microcontroller Software Support + * ---------------------------------------------------------------------------- + * Copyright (c) 2008, 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. + * ---------------------------------------------------------------------------- + */ + +//------------------------------------------------------------------------------ +// Global Functions +//------------------------------------------------------------------------------ + +static unsigned long int next = 1; + +//------------------------------------------------------------------------------ +// Global Functions +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +/// Initialize the seed for rand generator. +/// \param seed rand initiation seed +//------------------------------------------------------------------------------ +void srand(unsigned int seed) +{ + next = seed; +} + +//------------------------------------------------------------------------------ +/// Return a random number, maxinum assumed to be 65536 +//------------------------------------------------------------------------------ + +int rand(void) +{ + next = next * 1103515245 + 12345; + return (unsigned int)(next/131072) % 65536; +} + -- cgit v1.2.3