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58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_nrf51822
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* @{
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*
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* @file
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* @brief Driver for the NRF51822 random number generator
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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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_conf.h"
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#include "periph/random.h"
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/* guard file in case no random device was specified */
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#if RANDOM_NUMOF
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void random_init(void)
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{
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NRF_RNG->POWER = 1;
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NRF_RNG->TASKS_START = 1;
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}
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int random_read(char *buf, unsigned int num)
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{
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unsigned int count = 0;
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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++] = (char)NRF_RNG->VALUE;
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}
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return count;
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}
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void random_poweron(void)
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{
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NRF_RNG->POWER = 1;
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}
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void random_poweroff(void)
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{
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NRF_RNG->POWER = 0;
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}
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#endif /* RANDOM_NUMOF */
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