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random-arch.c
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random-arch.c
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/*
* Copyright (C) 2022 Yago Fontoura do Rosario <yago.rosario@hotmail.com.br>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup gecko
* @{
*
* \addtogroup gecko-os OS drivers
* @{
*
* \addtogroup gecko-random Random driver
* @{
*
* \file
* Random driver for the gecko.
* \author
* Yago Fontoura do Rosario <yago.rosario@hotmail.com.br>
*
*/
/*---------------------------------------------------------------------------*/
#include <stdlib.h>
#include <stdint.h>
#include "rail.h"
#include "em_system.h"
/*---------------------------------------------------------------------------*/
/**
* @brief Generates a new random number
* @return The random number.
*/
unsigned short
random_rand(void)
{
return (unsigned short)rand();
}
/*---------------------------------------------------------------------------*/
/**
* @brief Initialize the random number generator
* @param seed Ignored.
*/
void
random_init(unsigned short seed)
{
(void)seed;
uint32_t entropy;
(void)RAIL_GetRadioEntropy(RAIL_EFR32_HANDLE, (uint8_t *)(&entropy), sizeof(entropy));
/* If RAIL does not provide an entropy. */
/* Use system unique as entropy */
if(entropy == 0) {
entropy = SYSTEM_GetUnique();
}
srand(entropy);
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
* @}
*/