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RIOT/cpu/nrf52/periph/random.c
2016-02-05 12:07:32 +01:00

59 lines
1.1 KiB
C

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