kaspar/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2025-12-15 01:23:49 +01:00
Code Releases Activity

cpu/efm32/hwrng: add series 2 periph driver

Browse Source
This commit is contained in:
Jue 2022-10-19 09:30:33 +02:00
parent 53e444ebc7
commit ccf327a32b
3 changed files with 91 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
cpu/efm32/periph/Makefile
View File

@ -1,5 +1,14 @@
include $(RIOTCPU)/efm32/efm32-info.mk include $(RIOTCPU)/efm32/efm32-info.mk
# Select the correct implementation for `periph_timer`
ifneq (,$(filter periph_hwrng,$(USEMODULE)))
ifeq (1,$(EFM32_SERIES))
SRC += hwrng_series1.c
else ifeq (2,$(EFM32_SERIES))
SRC += hwrng_series2.c
endif
endif
# Select the correct implementation for `periph_rtc` # Select the correct implementation for `periph_rtc`
ifneq (,$(filter periph_rtc,$(USEMODULE))) ifneq (,$(filter periph_rtc,$(USEMODULE)))
ifeq (0,$(EFM32_SERIES)) ifeq (0,$(EFM32_SERIES))

0
cpu/efm32/periph/hwrng.c → cpu/efm32/periph/hwrng_series1.c
View File

82
cpu/efm32/periph/hwrng_series2.c Normal file
View File

@ -0,0 +1,82 @@
/*
* Copyright (C) 2022 SSV Software Systems 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.
*/
/**
* @ingroup cpu_efm32
* @ingroup drivers_periph_hwrng
* @{
*
* @file
* @brief Hardware random generator implementation.
*
* @author Juergen Fitschen <me@jue.yt>
* @}
*/
#include <assert.h>
#include "cpu.h"
#include "periph_conf.h"
#include "periph/hwrng.h"
#include "mutex.h"
#include "em_cmu.h"
#include "em_se.h"
#include <string.h>
void hwrng_init(void)
{
/* enable clock */
#if (_SILICON_LABS_32B_SERIES_2_CONFIG > 2)
CMU_ClockEnable(cmuClock_SEMAILBOX, true);
#endif
}
static void _get_random(uint8_t *buf, unsigned int num)
{
assert(num % 4 == 0);
static mutex_t mtx = MUTEX_INIT;
SE_Command_t cmd = SE_COMMAND_DEFAULT(SE_COMMAND_TRNG_GET_RANDOM);
SE_DataTransfer_t data_out = SE_DATATRANSFER_DEFAULT(buf, num);
SE_Response_t cmd_rsp;
/* prepare command */
SE_addDataOutput(&cmd, &data_out);
SE_addParameter(&cmd, num);
/* exec command */
mutex_lock(&mtx);
SE_executeCommand(&cmd);
SE_waitCommandCompletion();
cmd_rsp = SE_readCommandResponse();
mutex_unlock(&mtx);
(void)cmd_rsp;
assert(cmd_rsp == SE_RESPONSE_OK);
}
void hwrng_read(void *buf, unsigned int num)
{
uint8_t *data = buf;
unsigned int num_extra = num & 0x3U;
num &= ~0x3U;
if (num > 0) {
_get_random(&data[0], num);
}
if (num_extra > 0) {
uint8_t tmp[4];
_get_random(tmp, sizeof(tmp));
memcpy(&data[num], &tmp, num_extra);
}
}