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cpu/nrf5x: unified hwrng driver

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This commit is contained in:
Hauke Petersen 2016-02-17 17:02:01 +01:00
parent ea179fb8d3
commit a182a44147
2 changed files with 19 additions and 70 deletions
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65
cpu/nrf51/periph/hwrng.c
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@ -1,65 +0,0 @@
/*
* Copyright (C) 2014-2016 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_nrf51
* @{
*
* @file
* @brief Driver for the NRF51822 random number generator
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Frank Holtz <frank-riot2015@holtznet.de>
*
* @}
*/
#include "cpu.h"
#include "periph/hwrng.h"
void hwrng_init(void)
{
/* The RNG is initiated every time when RNG read is called
* This reduces power consumption when RNG is not needed
*/
}
void hwrng_read(uint8_t *buf, unsigned int num)
{
unsigned int count = 0;
/* power on RNG */
NRF_RNG->POWER = 1;
/* Generate events when RNG is finished */
NRF_RNG->INTENSET = RNG_INTENSET_VALRDY_Msk;
/* Start Task */
NRF_RNG->TASKS_START = 1;
/* NRF51 PAN #21 */
NRF_RNG->EVENTS_VALRDY = 0;
while (count < num) {
/* sleep until number is generated */
while (NRF_RNG->EVENTS_VALRDY == 0) {
/* enable wake up on events for __WFE CPU sleep */
SCB->SCR |= SCB_SCR_SEVONPEND_Msk;
/* sleep until next event */
__SEV();
__WFE();
__WFE();
}
buf[count++] = (uint8_t)NRF_RNG->VALUE;
/* NRF51 PAN #21 */
NRF_RNG->EVENTS_VALRDY = 0;
/* clear interrupt state */
NVIC_ClearPendingIRQ(RNG_IRQn);
}
/* power off RNG */
NRF_RNG->POWER = 0;
}

24
cpu/nrf52/periph/hwrng.c → cpu/nrf5x_common/periph/hwrng.c
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@ -1,6 +1,6 @@
/*
* Copyright (C) 2015 Jan Wagner <mail@jwagner.eu>
* 2016 Freie Universität Berlin
* Copyright (C) 2014-2016 Freie Universität Berlin
* 2015 Jan Wagner <mail@jwagner.eu>
*
* 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
@ -8,13 +8,14 @@
*/
/**
* @ingroup cpu_nrf52
* @ingroup cpu_nrf5x_common
* @{
*
* @file
* @brief Implementation of the hardware random number generator interface
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Frank Holtz <frank-riot2015@holtznet.de>
* @author Jan Wagner <mail@jwagner.eu>
*
* @}
@ -32,14 +33,27 @@ void hwrng_read(uint8_t *buf, unsigned int num)
{
unsigned int count = 0;
/* power on RNG */
#ifdef CPU_FAM_NRF51
NRF_RNG->POWER = 1;
#endif
NRF_RNG->TASKS_START = 1;
/* read the actual random data */
while (count < num) {
while (NRF_RNG->EVENTS_VALRDY == 0);
/* sleep until number is generated */
while (NRF_RNG->EVENTS_VALRDY == 0) {
cpu_sleep_until_event();
}
NRF_RNG->EVENTS_VALRDY = 0;
buf[count++] = (uint8_t)NRF_RNG->VALUE;
/* NRF51 PAN #21 -> read value before clearing VALRDY */
NRF_RNG->EVENTS_VALRDY = 0;
}
/* power off RNG */
NRF_RNG->TASKS_STOP = 1;
#ifdef CPU_FAM_NRF51
NRF_RNG->POWER = 0;
#endif
}