kaspar/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2025-12-31 17:31:18 +01:00
Code Releases Activity

cpu/kinetis_common: adapted HWRNG implementation

Browse Source
This commit is contained in:
Hauke Petersen 2016-02-05 16:45:43 +01:00
parent 1b58b187a9
commit 6f0179ce69
2 changed files with 39 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
cpu/kinetis_common/periph/random_rnga.c → cpu/kinetis_common/periph/hwrng_rnga.c
View File

@ -1,10 +1,10 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2014-2016 Freie Universität Berlin
* Copyright (C) 2014 PHYTEC Messtechnik GmbH
*
* 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.
* 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.
*/
/**
@ -13,7 +13,7 @@
* @{
*
* @file
* @brief Low-level random number generator driver implementation.
* @brief HWRNG interface implementation
*
* @author Johann Fischer <j.fischer@phytec.de> (adaption for Freescale's RNGA)
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
@ -22,21 +22,24 @@
*/
#include "cpu.h"
#include "periph/random.h"
#include "periph/hwrng.h"
#include "periph_conf.h"
#if RANDOM_NUMOF
#ifdef KINETIS_RNGA
void random_init(void)
void hwrng_init(void)
{
random_poweron();
/* nothing to do here */
}
int random_read(char *buf, unsigned int num)
void hwrng_read(uint8_t *buf, unsigned int num)
{
unsigned int count = 0;
/* power on and enable the device */
HWRNG_CLKEN();
KINETIS_RNGA->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
/* self-seeding */
while (!(KINETIS_RNGA->SR & RNG_SR_OREG_LVL_MASK));
@ -50,31 +53,14 @@ int random_read(char *buf, unsigned int num)
/* copy data into result vector */
for (int i = 0; i < 4 && count < num; i++) {
buf[count++] = (char)tmp;
buf[count++] = (uint8_t)tmp;
tmp = tmp >> 8;
}
}
return (int)count;
}
void random_poweron(void)
{
RANDOM_CLKEN();
KINETIS_RNGA->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
}
void random_poweroff(void)
{
/* power of the device */
KINETIS_RNGA->CR = 0;
RANDOM_CLKDIS();
HWRNG_CLKDIS();
}
/*
void isr_rng(void)
{
}
*/
#endif /* KINETIS_RNGA */
#endif /* RANDOM_NUMOF */

63
cpu/kinetis_common/periph/random_rngb.c → cpu/kinetis_common/periph/hwrng_rngb.c
View File

@ -1,11 +1,11 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2014-2016 Freie Universität Berlin
* Copyright (C) 2014 PHYTEC Messtechnik GmbH
* Copyright (C) 2015 Eistec AB
*
* 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.
* 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.
*/
/**
@ -13,7 +13,7 @@
* @{
*
* @file
* @brief Low-level random number generator driver implementation.
* @brief HWRNG interface implementation
*
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se> (adaption for Freescale's RNGB)
* @author Johann Fischer <j.fischer@phytec.de> (adaption for Freescale's RNGA)
@ -23,22 +23,32 @@
*/
#include "cpu.h"
#include "periph/random.h"
#include "periph/hwrng.h"
#include "periph_conf.h"
#if RANDOM_NUMOF
#ifdef KINETIS_RNGB
void random_init(void)
void hwrng_init(void)
{
random_poweron();
/* nothing to be done here */
}
int random_read(char *buf, unsigned int num)
void hwrng_read(uint8_t *buf, unsigned int num)
{
unsigned int count = 0;
HWRNG_CLKEN();
if ((KINETIS_RNGB->VER & RNG_VER_TYPE_MASK) != 0b0001) {
/* Wrong type of RNG */
/* TODO: Handle */
}
/* Software reset, bit is self-clearing */
BITBAND_REG32(KINETIS_RNGB->CMD, RNG_CMD_SR_SHIFT) = 1;
/* Set up automatic reseed */
KINETIS_RNGB->CR = RNG_CR_AR_MASK | RNG_CR_MASKERR_MASK | RNG_CR_MASKDONE_MASK;
while (count < num) {
uint32_t tmp;
@ -49,40 +59,13 @@ int random_read(char *buf, unsigned int num)
/* copy data into result vector */
for (int i = 0; i < 4 && count < num; i++) {
buf[count++] = (char)tmp;
buf[count++] = (uint8_t)tmp;
tmp = tmp >> 8;
}
}
return (int)count;
}
void random_poweron(void)
{
RANDOM_CLKEN();
if ((KINETIS_RNGB->VER & RNG_VER_TYPE_MASK) != 0b0001) {
/* Wrong type of RNG */
/* TODO: Handle */
}
/* Software reset, bit is self-clearing */
BITBAND_REG32(KINETIS_RNGB->CMD, RNG_CMD_SR_SHIFT) = 1;
/* Set up automatic reseed */
KINETIS_RNGB->CR = RNG_CR_AR_MASK | RNG_CR_MASKERR_MASK | RNG_CR_MASKDONE_MASK;
}
void random_poweroff(void)
{
KINETIS_RNGB->CR = 0;
RANDOM_CLKDIS();
HWRNG_CLKDIS();
}
/*
void isr_rng(void)
{
}
*/
#endif /* KINETIS_RNGB */
#endif /* RANDOM_NUMOF */