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46 lines
937 B
C
46 lines
937 B
C
/*
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* Copyright (C) 2015 Jan Wagner <mail@jwagner.eu>
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* 2016 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_nrf52
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* @{
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*
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* @file
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* @brief Implementation of the hardware random number generator interface
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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* @author Jan Wagner <mail@jwagner.eu>
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*
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* @}
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*/
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#include "cpu.h"
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#include "periph/hwrng.h"
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void hwrng_init(void)
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{
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/* nothing to do here */
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}
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void hwrng_read(uint8_t *buf, unsigned int num)
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{
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unsigned int count = 0;
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NRF_RNG->TASKS_START = 1;
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while (count < num) {
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while (NRF_RNG->EVENTS_VALRDY == 0);
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NRF_RNG->EVENTS_VALRDY = 0;
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buf[count++] = (uint8_t)NRF_RNG->VALUE;
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}
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NRF_RNG->TASKS_STOP = 1;
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}
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