Contiki-NG
random.c
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1 /*
2  * Copyright (c) 2015, Nordic Semiconductor
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 copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the Institute nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  */
30 /**
31  * \addtogroup nrf52832
32  * @{
33  *
34  * \addtogroup nrf52832-dev Device drivers
35  * @{
36  *
37  * \addtogroup nrf52832-rng Hardware random number generator
38  * @{
39  *
40  * \file
41  * Random number generator routines exploiting the nRF52 hardware
42  * capabilities.
43  *
44  * This file overrides os/lib/random.c.
45  *
46  * \author
47  * Wojciech Bober <wojciech.bober@nordicsemi.no>
48  */
49 #include <stddef.h>
50 #include <nrf_drv_rng.h>
51 #include "app_error.h"
52 /*---------------------------------------------------------------------------*/
53 /**
54  * \brief Generates a new random number using the nRF52 RNG.
55  * \return a random number.
56  */
57 unsigned short
59 {
60  unsigned short value = 42;
61  uint8_t available;
62  ret_code_t err_code;
63 
64  do {
65  nrf_drv_rng_bytes_available(&available);
66  } while (available < sizeof(value));
67 
68  err_code = nrf_drv_rng_rand((uint8_t *)&value, sizeof(value));
69  APP_ERROR_CHECK(err_code);
70 
71  return value;
72 }
73 /*---------------------------------------------------------------------------*/
74 /**
75  * \brief Initialize the nRF52 random number generator.
76  * \param seed Ignored. It's here because the function prototype is in core.
77  *
78  */
79 void
80 random_init(unsigned short seed)
81 {
82  (void)seed;
83  ret_code_t err_code = nrf_drv_rng_init(NULL);
84  APP_ERROR_CHECK(err_code);
85 }
86 /**
87  * @}
88  * @}
89  * @}
90  */
void random_init(unsigned short seed)
Seed the cc2538 random number generator.
Definition: random.c:84
unsigned short random_rand(void)
Generates a new random number using the cc2538 RNG.
Definition: random.c:58