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523 lines
15 KiB
523 lines
15 KiB
/**
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******************************************************************************
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* @file stm32l0xx_hal_rng.c
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* @author MCD Application Team
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* @brief RNG HAL module driver.
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* This file provides firmware functions to manage the following
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* functionalities of the Random Number Generator (RNG) peripheral:
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* + Initialization/de-initialization functions
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* + Peripheral Control functions
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* + Peripheral State functions
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*
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@verbatim
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==============================================================================
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##### How to use this driver #####
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==============================================================================
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[..]
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The RNG HAL driver can be used as follows:
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(#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro.
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in HAL_RNG_MspInit().
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(#) Activate the RNG peripheral using HAL_RNG_Init() function.
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(#) Wait until the 32 bit Random Number Generator contains a valid
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random data using (polling/interrupt) mode.
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(#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function.
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l0xx_hal.h"
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/** @addtogroup STM32L0xx_HAL_Driver
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* @{
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*/
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#ifdef HAL_RNG_MODULE_ENABLED
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#if defined (STM32L052xx) || defined (STM32L053xx) || defined (STM32L062xx) || defined (STM32L063xx) || \
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defined (STM32L072xx) || defined (STM32L073xx) || defined (STM32L082xx) || defined (STM32L083xx)
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/** @addtogroup RNG
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* @{
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*/
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/* Private types -------------------------------------------------------------*/
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/* Private Defines -----------------------------------------------------------*/
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/** @addtogroup RNG_Private
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* @{
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*/
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#define RNG_TIMEOUT_VALUE 1000U
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/**
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* @}
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*/
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/* Private variables ---------------------------------------------------------*/
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/* Private constants ---------------------------------------------------------*/
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/* Private macros ------------------------------------------------------------*/
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/* Private functions prototypes ----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup RNG_Exported_Functions
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* @{
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*/
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/** @addtogroup RNG_Exported_Functions_Group1
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* @brief Initialization and de-initialization functions
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*
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@verbatim
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===============================================================================
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##### Initialization and de-initialization functions #####
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===============================================================================
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[..] This section provides functions allowing to:
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(+) Initialize the RNG according to the specified parameters
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in the RNG_InitTypeDef and create the associated handle
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(+) DeInitialize the RNG peripheral
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(+) Initialize the RNG MSP
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(+) DeInitialize RNG MSP
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@endverbatim
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* @{
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*/
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/**
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* @brief Initializes the RNG peripheral and creates the associated handle.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng)
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{
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/* Check the RNG handle allocation */
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if(hrng == NULL)
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{
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return HAL_ERROR;
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}
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assert_param(IS_RNG_ALL_INSTANCE(hrng->Instance));
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__HAL_LOCK(hrng);
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if(hrng->State == HAL_RNG_STATE_RESET)
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{
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/* Allocate lock resource and initialize it */
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hrng->Lock = HAL_UNLOCKED;
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/* Init the low level hardware */
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HAL_RNG_MspInit(hrng);
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}
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_BUSY;
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/* Enable the RNG Peripheral */
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__HAL_RNG_ENABLE(hrng);
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/* Initialize the RNG state */
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hrng->State = HAL_RNG_STATE_READY;
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__HAL_UNLOCK(hrng);
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/* Return function status */
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return HAL_OK;
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}
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/**
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* @brief DeInitializes the RNG peripheral.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
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{
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/* Check the RNG handle allocation */
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if(hrng == NULL)
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{
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return HAL_ERROR;
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}
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/* Disable the RNG Peripheral */
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CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN);
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/* Clear RNG interrupt status flags */
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CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS);
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/* DeInit the low level hardware */
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HAL_RNG_MspDeInit(hrng);
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/* Update the RNG state */
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hrng->State = HAL_RNG_STATE_RESET;
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/* Release Lock */
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__HAL_UNLOCK(hrng);
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/* Return the function status */
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return HAL_OK;
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}
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/**
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* @brief Initializes the RNG MSP.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval None
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*/
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__weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hrng);
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/* NOTE : This function should not be modified. When the callback is needed,
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function HAL_RNG_MspInit must be implemented in the user file.
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*/
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}
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/**
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* @brief DeInitializes the RNG MSP.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval None
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*/
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__weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hrng);
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/* NOTE : This function should not be modified. When the callback is needed,
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function HAL_RNG_MspDeInit must be implemented in the user file.
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*/
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}
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/**
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* @}
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*/
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/** @addtogroup RNG_Exported_Functions_Group2
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* @brief Peripheral Control functions
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*
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@verbatim
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===============================================================================
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##### Peripheral Control functions #####
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===============================================================================
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[..] This section provides functions allowing to:
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(+) Get the 32 bit Random number
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(+) Get the 32 bit Random number with interrupt enabled
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(+) Handle RNG interrupt request
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@endverbatim
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* @{
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*/
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/**
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* @brief Generates a 32-bit random number.
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* @note Each time the random number data is read the RNG_FLAG_DRDY flag
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* is automatically cleared.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @param random32bit: pointer to generated random number variable if successful.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit)
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{
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uint32_t tickstart = 0U;
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HAL_StatusTypeDef status = HAL_OK;
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/* Process Locked */
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__HAL_LOCK(hrng);
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/* Check RNG peripheral state */
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if(hrng->State == HAL_RNG_STATE_READY)
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{
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_BUSY;
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/* Get tick */
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tickstart = HAL_GetTick();
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/* Check if data register contains valid random data */
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while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
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{
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if((HAL_GetTick() - tickstart ) > RNG_TIMEOUT_VALUE)
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{
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hrng->State = HAL_RNG_STATE_ERROR;
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/* Process Unlocked */
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__HAL_UNLOCK(hrng);
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return HAL_TIMEOUT;
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}
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}
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/* Get a 32bit Random number */
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hrng->RandomNumber = hrng->Instance->DR;
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*random32bit = hrng->RandomNumber;
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hrng->State = HAL_RNG_STATE_READY;
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}
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else
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{
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status = HAL_ERROR;
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}
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/* Process Unlocked */
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__HAL_UNLOCK(hrng);
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return status;
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}
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/**
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* @brief Generates a 32-bit random number in interrupt mode.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng)
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{
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HAL_StatusTypeDef status = HAL_OK;
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/* Process Locked */
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__HAL_LOCK(hrng);
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/* Check RNG peripheral state */
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if(hrng->State == HAL_RNG_STATE_READY)
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{
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_BUSY;
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/* Process Unlocked */
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__HAL_UNLOCK(hrng);
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/* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
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__HAL_RNG_ENABLE_IT(hrng);
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}
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else
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{
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/* Process Unlocked */
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__HAL_UNLOCK(hrng);
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status = HAL_ERROR;
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}
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return status;
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}
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/**
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* @brief Handles RNG interrupt request.
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* @note In the case of a clock error, the RNG is no more able to generate
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* random numbers because the PLL48CLK clock is not correct. User has
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* to check that the clock controller is correctly configured to provide
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* the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
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* The clock error has no impact on the previously generated
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* random numbers, and the RNG_DR register contents can be used.
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* @note In the case of a seed error, the generation of random numbers is
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* interrupted as long as the SECS bit is '1'. If a number is
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* available in the RNG_DR register, it must not be used because it may
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* not have enough entropy. In this case, it is recommended to clear the
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* SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
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* the RNG peripheral to reinitialize and restart the RNG.
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* @note User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
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* or CEIS are set.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval None
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*/
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void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
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{
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/* RNG clock error interrupt occurred */
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if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET))
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{
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_ERROR;
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HAL_RNG_ErrorCallback(hrng);
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/* Clear the clock error flag */
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__HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI);
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}
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/* Check RNG data ready interrupt occurred */
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if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
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{
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/* Generate random number once, so disable the IT */
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__HAL_RNG_DISABLE_IT(hrng);
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/* Get the 32bit Random number (DRDY flag automatically cleared) */
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hrng->RandomNumber = hrng->Instance->DR;
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if(hrng->State != HAL_RNG_STATE_ERROR)
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{
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_READY;
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/* Data Ready callback */
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HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
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}
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}
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}
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/**
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* @brief return generated random number in polling mode (Obsolete).
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* Use HAL_RNG_GenerateRandomNumber() API instead.
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* @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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* the configuration information for RNG.
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* @retval random value
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*/
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uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng)
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{
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if(HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK)
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{
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return hrng->RandomNumber;
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}
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else
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{
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return 0U;
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}
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}
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/**
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* @brief Returns a 32-bit random number with interrupt enabled (Obsolete),
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* Use HAL_RNG_GenerateRandomNumber_IT() API instead.
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* @param hrng: RNG handle
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* @retval 32-bit random number
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*/
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uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng)
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{
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uint32_t random32bit = 0U;
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/* Process locked */
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__HAL_LOCK(hrng);
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/* Change RNG peripheral state */
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hrng->State = HAL_RNG_STATE_BUSY;
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/* Get a 32bit Random number */
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random32bit = hrng->Instance->DR;
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/* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
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__HAL_RNG_ENABLE_IT(hrng);
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/* Return the 32 bit random number */
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return random32bit;
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}
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/**
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* @brief Read latest generated random number.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval random value
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*/
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uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng)
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{
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return(hrng->RandomNumber);
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}
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/**
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* @brief Data Ready callback in non-blocking mode.
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* @param hrng: pointer to a RNG_HandleTypeDef structure..
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* @param random32bit: generated random value
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* @retval None
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*/
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__weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hrng);
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/* NOTE : This function should not be modified. When the callback is needed,
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function HAL_RNG_ReadyDataCallback must be implemented in the user file.
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*/
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}
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/**
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* @brief RNG error callbacks.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval None
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*/
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__weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hrng);
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/* NOTE : This function should not be modified. When the callback is needed,
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function HAL_RNG_ErrorCallback must be implemented in the user file.
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*/
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}
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/**
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* @}
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*/
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/** @addtogroup RNG_Exported_Functions_Group3
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* @brief Peripheral State functions.
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*
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@verbatim
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===============================================================================
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##### Peripheral State functions #####
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===============================================================================
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[..]
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This subsection permits to get in run-time the status of the peripheral.
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@endverbatim
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* @{
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*/
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/**
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* @brief Returns the RNG state.
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* @param hrng: pointer to a RNG_HandleTypeDef structure.
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* @retval HAL state
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*/
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HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
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{
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return hrng->State;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* if defined (STM32L052xx) || defined (STM32L053xx) || defined (STM32L062xx) || defined (STM32L063xx) || \
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defined (STM32L072xx) || defined (STM32L073xx) || defined (STM32L082xx) || defined (STM32L083xx) */
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#endif /* HAL_RNG_MODULE_ENABLED */
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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