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cpu/stm32_common: unified hwrng driver

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pr/rotary
Hauke Petersen 7 years ago
parent b1eaed72e8
commit 2a6a82ce2c
2 changed files with 8 additions and 71 deletions
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10
cpu/stm32f4/periph/hwrng.c → cpu/stm32_common/periph/hwrng.c
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2014-2016 Freie Universität Berlin
* Copyright (C) 2014-2017 Freie Universität Berlin
* 2016 OTA keys S.A.
*
* 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
@ -7,13 +8,14 @@
*/
/**
* @ingroup cpu_stm32f4
* @ingroup cpu_stm32_common
* @{
*
* @file
* @brief Low-level random number generator driver implementation
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Aurelien Gonce <aurelien.gonce@altran.fr>
*
* @}
*/
@ -38,6 +40,8 @@ void hwrng_read(void *buf, unsigned int num)
/* power on and enable the device */
#if defined(CPU_MODEL_STM32F410RB)
periph_clk_en(AHB1, RCC_AHB1ENR_RNGEN);
#elif defined(CPU_FAM_STM32L0)
periph_clk_en(AHB, RCC_AHBENR_RNGEN);
#else
periph_clk_en(AHB2, RCC_AHB2ENR_RNGEN);
#endif
@ -60,6 +64,8 @@ void hwrng_read(void *buf, unsigned int num)
RNG->CR = 0;
#if defined(CPU_MODEL_STM32F410RB)
periph_clk_dis(AHB1, RCC_AHB1ENR_RNGEN);
#elif defined(CPU_FAM_STM32L0)
periph_clk_dis(AHB, RCC_AHBENR_RNGEN);
#else
periph_clk_dis(AHB2, RCC_AHB2ENR_RNGEN);
#endif

69
cpu/stm32f2/periph/hwrng.c
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@ -1,69 +0,0 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2016 OTA keys S.A.
*
* 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_stm32f2
* @{
*
* @file
* @brief Low-level random number generator driver implementation
*
* @author Hauke Petersen <mail@haukepetersen.de>
* @author Aurelien Gonce <aurelien.gonce@altran.fr>
*
* @}
*/
#include "cpu.h"
#include "periph/hwrng.h"
#include "periph_conf.h"
/* ignore file in case no RNG device is defined */
#ifdef RNG
void hwrng_init(void)
{
/* enable RNG reset state */
periph_clk_en(AHB2, RCC_AHB2ENR_RNGEN);
/* release RNG from reset state */
periph_clk_dis(AHB2, RCC_AHB2ENR_RNGEN);
}
void hwrng_read(void *buf, unsigned int num)
{
/* cppcheck-suppress variableScope */
uint32_t tmp;
unsigned int count = 0;
uint8_t *b = (uint8_t *)buf;
/* enable RNG reset state */
periph_clk_en(AHB2, RCC_AHB2ENR_RNGEN);
/* enable the RNG */
RNG->CR |= RNG_CR_RNGEN;
while (count < num) {
/* wait for random data to be ready to read */
while (!(RNG->SR & RNG_SR_DRDY));
/* read next 4 bytes */
tmp = RNG->DR;
/* copy data into result vector */
for (int i = 0; i < 4 && count < num; i++) {
b[count++] = (uint8_t)tmp;
tmp = tmp >> 8;
}
}
/* disable the RNG */
RNG->CR &= ~RNG_CR_RNGEN;
/* release RNG from reset state */
periph_clk_dis(AHB2, RCC_AHB2ENR_RNGEN);
}
#endif /* RANDOM_NUMOF */
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