91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* Copyright (c) 2015, Nordic Semiconductor
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \addtogroup nrf52832
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* @{
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*
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* \addtogroup nrf52832-dev Device drivers
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* @{
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*
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* \addtogroup nrf52832-rng Hardware random number generator
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* @{
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*
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* \file
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* Random number generator routines exploiting the nRF52 hardware
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* capabilities.
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*
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* This file overrides os/lib/random.c.
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*
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* \author
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* Wojciech Bober <wojciech.bober@nordicsemi.no>
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*/
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#include <stddef.h>
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#include <nrf_drv_rng.h>
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#include "app_error.h"
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Generates a new random number using the nRF52 RNG.
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* \return a random number.
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*/
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unsigned short
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random_rand(void)
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{
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unsigned short value = 42;
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uint8_t available;
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ret_code_t err_code;
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do {
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nrf_drv_rng_bytes_available(&available);
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} while (available < sizeof(value));
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err_code = nrf_drv_rng_rand((uint8_t *)&value, sizeof(value));
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APP_ERROR_CHECK(err_code);
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return value;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialize the nRF52 random number generator.
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* \param seed Ignored. It's here because the function prototype is in core.
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*
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*/
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void
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random_init(unsigned short seed)
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{
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(void)seed;
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ret_code_t err_code = nrf_drv_rng_init(NULL);
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APP_ERROR_CHECK(err_code);
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}
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/**
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* @}
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* @}
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* @}
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*/
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