Contiki 2.5
rand.c
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1 /*
2  * Copyright (c) 2010, STMicroelectronics.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following
12  * disclaimer in the documentation and/or other materials provided
13  * with the distribution.
14  * 3. The name of the author may not be used to endorse or promote
15  * products derived from this software without specific prior
16  * written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
24  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  *
30  * This file is part of the Contiki OS
31  *
32  * $Id: rand.c,v 1.3 2011/01/17 10:08:14 salvopitru Exp $
33  */
34 /*---------------------------------------------------------------------------*/
35 /**
36 * \file
37 * Random number functions for STM32W.
38 * \author
39 * Salvatore Pitrulli <salvopitru@users.sourceforge.net>
40 */
41 /*---------------------------------------------------------------------------*/
42 
43 #include "dev/stm32w-radio.h"
44 #include "lib/random.h"
45 
46 #if (RANDOM_RAND_MAX != 0xffff)
47 #warning "RANDOM_RAND_MAX is not defined as 65535."
48 #endif
49 
50 int rand(void)
51 {
52  u16_t rand_num;
53 
54  ST_RadioGetRandomNumbers(&rand_num, 1);
55 
56  return (int)rand_num;
57 }
58 
59 /*
60  * It does nothing, since the rand already generates true random numbers.
61  */
62 void srand(unsigned int seed)
63 {
64 }