Diff: targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rng.c

Revision:

189:f392fc9709a3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32H7/device/stm32h7xx_hal_rng.c	Wed Feb 20 22:31:08 2019 +0000
@@ -0,0 +1,814 @@
+/**
+  ******************************************************************************
+  * @file    stm32h7xx_hal_rng.c
+  * @author  MCD Application Team
+  * @brief   RNG HAL module driver.
+  *          This file provides firmware functions to manage the following
+  *          functionalities of the Random Number Generator (RNG) peripheral:
+  *           + Initialization and configuration functions
+  *           + Peripheral Control functions
+  *           + Peripheral State functions
+  *
+  @verbatim
+  ==============================================================================
+                     ##### How to use this driver #####
+  ==============================================================================
+  [..]
+      The RNG HAL driver can be used as follows:
+
+      (#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro
+          in HAL_RNG_MspInit().
+      (#) Activate the RNG peripheral using HAL_RNG_Init() function.
+      (#) Wait until the 32 bit Random Number Generator contains a valid
+          random data using (polling/interrupt) mode.
+      (#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function.
+
+    ##### Callback registration #####
+    ==================================
+
+    [..]
+    The compilation define USE_HAL_RNG_REGISTER_CALLBACKS when set to 1
+    allows the user to configure dynamically the driver callbacks.
+
+    [..]
+    Use Function @ref HAL_RNG_RegisterCallback() to register a user callback.
+    Function @ref HAL_RNG_RegisterCallback() allows to register following callbacks:
+    (+) ErrorCallback             : RNG Error Callback.
+    (+) MspInitCallback           : RNG MspInit.
+    (+) MspDeInitCallback         : RNG MspDeInit.
+    This function takes as parameters the HAL peripheral handle, the Callback ID
+    and a pointer to the user callback function.
+
+    [..]
+    Use function @ref HAL_RNG_UnRegisterCallback() to reset a callback to the default
+    weak (surcharged) function.
+    @ref HAL_RNG_UnRegisterCallback() takes as parameters the HAL peripheral handle,
+    and the Callback ID.
+    This function allows to reset following callbacks:
+    (+) ErrorCallback             : RNG Error Callback.
+    (+) MspInitCallback           : RNG MspInit.
+    (+) MspDeInitCallback         : RNG MspDeInit.
+
+    [..]
+    For specific callback ReadyDataCallback, use dedicated register callbacks:
+    respectively @ref HAL_RNG_RegisterReadyDataCallback() , @ref HAL_RNG_UnRegisterReadyDataCallback().
+
+    [..]
+    By default, after the @ref HAL_RNG_Init() and when the state is HAL_RNG_STATE_RESET
+    all callbacks are set to the corresponding weak (surcharged) functions:
+    example @ref HAL_RNG_ErrorCallback().
+    Exception done for MspInit and MspDeInit functions that are respectively
+    reset to the legacy weak (surcharged) functions in the @ref HAL_RNG_Init()
+    and @ref HAL_RNG_DeInit() only when these callbacks are null (not registered beforehand).
+    If not, MspInit or MspDeInit are not null, the @ref HAL_RNG_Init() and @ref HAL_RNG_DeInit()
+    keep and use the user MspInit/MspDeInit callbacks (registered beforehand).
+
+    [..]
+    Callbacks can be registered/unregistered in HAL_RNG_STATE_READY state only.
+    Exception done MspInit/MspDeInit that can be registered/unregistered
+    in HAL_RNG_STATE_READY or HAL_RNG_STATE_RESET state, thus registered (user)
+    MspInit/DeInit callbacks can be used during the Init/DeInit.
+    In that case first register the MspInit/MspDeInit user callbacks
+    using @ref HAL_RNG_RegisterCallback() before calling @ref HAL_RNG_DeInit()
+    or @ref HAL_RNG_Init() function.
+
+    [..]
+    When The compilation define USE_HAL_RNG_REGISTER_CALLBACKS is set to 0 or
+    not defined, the callback registration feature is not available
+    and weak (surcharged) callbacks are used.
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32h7xx_hal.h"
+
+/** @addtogroup STM32H7xx_HAL_Driver
+  * @{
+  */
+
+#if defined (RNG)
+
+/** @addtogroup RNG
+  * @brief RNG HAL module driver.
+  * @{
+  */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+
+/* Private types -------------------------------------------------------------*/
+/* Private defines -----------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private constants ---------------------------------------------------------*/
+/** @defgroup RNG_Private_Constants RNG Private Constants
+  * @{
+  */
+#define RNG_TIMEOUT_VALUE     2U
+/**
+  * @}
+  */
+/* Private macros ------------------------------------------------------------*/
+/* Private functions prototypes ----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+/* Exported functions --------------------------------------------------------*/
+
+/** @addtogroup RNG_Exported_Functions
+  * @{
+  */
+
+/** @addtogroup RNG_Exported_Functions_Group1
+ *  @brief   Initialization and configuration functions
+ *
+@verbatim
+ ===============================================================================
+          ##### Initialization and configuration functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Initialize the RNG according to the specified parameters
+          in the RNG_InitTypeDef and create the associated handle
+      (+) DeInitialize the RNG peripheral
+      (+) Initialize the RNG MSP
+      (+) DeInitialize RNG MSP
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initializes the RNG peripheral and creates the associated handle.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng)
+{
+  /* Check the RNG handle allocation */
+  if (hrng == NULL)
+  {
+    return HAL_ERROR;
+  }
+  /* Check the parameters */
+  assert_param(IS_RNG_ALL_INSTANCE(hrng->Instance));
+  assert_param(IS_RNG_CED(hrng->Init.ClockErrorDetection));
+
+#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
+  if (hrng->State == HAL_RNG_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hrng->Lock = HAL_UNLOCKED;
+
+    hrng->ReadyDataCallback  = HAL_RNG_ReadyDataCallback;  /* Legacy weak ReadyDataCallback  */
+    hrng->ErrorCallback      = HAL_RNG_ErrorCallback;      /* Legacy weak ErrorCallback      */
+
+    if (hrng->MspInitCallback == NULL)
+    {
+      hrng->MspInitCallback = HAL_RNG_MspInit; /* Legacy weak MspInit  */
+    }
+
+    /* Init the low level hardware */
+    hrng->MspInitCallback(hrng);
+  }
+#else
+  if (hrng->State == HAL_RNG_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hrng->Lock = HAL_UNLOCKED;
+
+    /* Init the low level hardware */
+    HAL_RNG_MspInit(hrng);
+  }
+#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
+
+  /* Change RNG peripheral state */
+  hrng->State = HAL_RNG_STATE_BUSY;
+
+  /* Clock Error Detection Configuration */
+  MODIFY_REG(hrng->Instance->CR, RNG_CR_CED, hrng->Init.ClockErrorDetection);
+
+  /* Enable the RNG Peripheral */
+  __HAL_RNG_ENABLE(hrng);
+
+  /* Initialize the RNG state */
+  hrng->State = HAL_RNG_STATE_READY;
+
+  /* Initialise the error code */
+  hrng->ErrorCode = HAL_RNG_ERROR_NONE;
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  DeInitializes the RNG peripheral.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
+{
+  /* Check the RNG handle allocation */
+  if (hrng == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Clear Clock Error Detection bit */
+  CLEAR_BIT(hrng->Instance->CR, RNG_CR_CED);
+  /* Disable the RNG Peripheral */
+  CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN);
+
+  /* Clear RNG interrupt status flags */
+  CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS);
+
+#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
+  if (hrng->MspDeInitCallback == NULL)
+  {
+    hrng->MspDeInitCallback = HAL_RNG_MspDeInit; /* Legacy weak MspDeInit  */
+  }
+
+  /* DeInit the low level hardware */
+  hrng->MspDeInitCallback(hrng);
+#else
+  /* DeInit the low level hardware */
+  HAL_RNG_MspDeInit(hrng);
+#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
+
+  /* Update the RNG state */
+  hrng->State = HAL_RNG_STATE_RESET;
+
+  /* Initialise the error code */
+  hrng->ErrorCode = HAL_RNG_ERROR_NONE;
+
+  /* Release Lock */
+  __HAL_UNLOCK(hrng);
+
+  /* Return the function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Initializes the RNG MSP.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval None
+  */
+__weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hrng);
+  /* NOTE : This function should not be modified. When the callback is needed,
+            function HAL_RNG_MspInit must be implemented in the user file.
+   */
+}
+
+/**
+  * @brief  DeInitializes the RNG MSP.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval None
+  */
+__weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hrng);
+  /* NOTE : This function should not be modified. When the callback is needed,
+            function HAL_RNG_MspDeInit must be implemented in the user file.
+   */
+}
+
+#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
+/**
+  * @brief  Register a User RNG Callback
+  *         To be used instead of the weak predefined callback
+  * @param  hrng RNG handle
+  * @param  CallbackID ID of the callback to be registered
+  *         This parameter can be one of the following values:
+  *          @arg @ref HAL_RNG_ERROR_CB_ID Error callback ID
+  *          @arg @ref HAL_RNG_MSPINIT_CB_ID MspInit callback ID
+  *          @arg @ref HAL_RNG_MSPDEINIT_CB_ID MspDeInit callback ID
+  * @param  pCallback pointer to the Callback function
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_RegisterCallback(RNG_HandleTypeDef *hrng, HAL_RNG_CallbackIDTypeDef CallbackID, pRNG_CallbackTypeDef pCallback)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  if (pCallback == NULL)
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    return HAL_ERROR;
+  }
+  /* Process locked */
+  __HAL_LOCK(hrng);
+
+  if (HAL_RNG_STATE_READY == hrng->State)
+  {
+    switch (CallbackID)
+    {
+    case HAL_RNG_ERROR_CB_ID :
+      hrng->ErrorCallback = pCallback;
+      break;
+
+    case HAL_RNG_MSPINIT_CB_ID :
+      hrng->MspInitCallback = pCallback;
+      break;
+
+    case HAL_RNG_MSPDEINIT_CB_ID :
+      hrng->MspDeInitCallback = pCallback;
+      break;
+
+    default :
+      /* Update the error code */
+      hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else if (HAL_RNG_STATE_RESET == hrng->State)
+  {
+    switch (CallbackID)
+    {
+    case HAL_RNG_MSPINIT_CB_ID :
+      hrng->MspInitCallback = pCallback;
+      break;
+
+    case HAL_RNG_MSPDEINIT_CB_ID :
+      hrng->MspDeInitCallback = pCallback;
+      break;
+
+    default :
+      /* Update the error code */
+      hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hrng);
+  return status;
+}
+
+/**
+  * @brief  Unregister an RNG Callback
+  *         RNG callabck is redirected to the weak predefined callback
+  * @param  hrng RNG handle
+  * @param  CallbackID ID of the callback to be unregistered
+  *         This parameter can be one of the following values:
+  *          @arg @ref HAL_RNG_ERROR_CB_ID Error callback ID
+  *          @arg @ref HAL_RNG_MSPINIT_CB_ID MspInit callback ID
+  *          @arg @ref HAL_RNG_MSPDEINIT_CB_ID MspDeInit callback ID
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_UnRegisterCallback(RNG_HandleTypeDef *hrng, HAL_RNG_CallbackIDTypeDef CallbackID)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process locked */
+  __HAL_LOCK(hrng);
+
+  if (HAL_RNG_STATE_READY == hrng->State)
+  {
+    switch (CallbackID)
+    {
+    case HAL_RNG_ERROR_CB_ID :
+      hrng->ErrorCallback = HAL_RNG_ErrorCallback;          /* Legacy weak ErrorCallback  */
+      break;
+
+    case HAL_RNG_MSPINIT_CB_ID :
+      hrng->MspInitCallback = HAL_RNG_MspInit;              /* Legacy weak MspInit  */
+      break;
+
+    case HAL_RNG_MSPDEINIT_CB_ID :
+      hrng->MspDeInitCallback = HAL_RNG_MspDeInit;          /* Legacy weak MspDeInit  */
+      break;
+
+    default :
+      /* Update the error code */
+      hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else if (HAL_RNG_STATE_RESET == hrng->State)
+  {
+    switch (CallbackID)
+    {
+    case HAL_RNG_MSPINIT_CB_ID :
+      hrng->MspInitCallback = HAL_RNG_MspInit;              /* Legacy weak MspInit  */
+      break;
+
+    case HAL_RNG_MSPDEINIT_CB_ID :
+      hrng->MspDeInitCallback = HAL_RNG_MspDeInit;          /* Legacy weak MspInit  */
+      break;
+
+    default :
+      /* Update the error code */
+      hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hrng);
+  return status;
+}
+
+/**
+  * @brief  Register Data Ready RNG Callback
+  *         To be used instead of the weak HAL_RNG_ReadyDataCallback() predefined callback
+  * @param  hrng RNG handle
+  * @param  pCallback pointer to the Data Ready Callback function
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_RegisterReadyDataCallback(RNG_HandleTypeDef *hrng, pRNG_ReadyDataCallbackTypeDef pCallback)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  if (pCallback == NULL)
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    return HAL_ERROR;
+  }
+  /* Process locked */
+  __HAL_LOCK(hrng);
+
+  if (HAL_RNG_STATE_READY == hrng->State)
+  {
+    hrng->ReadyDataCallback = pCallback;
+  }
+  else
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hrng);
+  return status;
+}
+
+/**
+  * @brief  UnRegister the Data Ready RNG Callback
+  *         Data Ready RNG Callback is redirected to the weak HAL_RNG_ReadyDataCallback() predefined callback
+  * @param  hrng RNG handle
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_UnRegisterReadyDataCallback(RNG_HandleTypeDef *hrng)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process locked */
+  __HAL_LOCK(hrng);
+
+  if (HAL_RNG_STATE_READY == hrng->State)
+  {
+    hrng->ReadyDataCallback = HAL_RNG_ReadyDataCallback; /* Legacy weak ReadyDataCallback  */
+  }
+  else
+  {
+    /* Update the error code */
+    hrng->ErrorCode |= HAL_RNG_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hrng);
+  return status;
+}
+
+#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
+
+/**
+  * @}
+  */
+
+/** @addtogroup RNG_Exported_Functions_Group2
+ *  @brief   Peripheral Control functions
+ *
+@verbatim
+ ===============================================================================
+                      ##### Peripheral Control functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Get the 32 bit Random number
+      (+) Get the 32 bit Random number with interrupt enabled
+      (+) Handle RNG interrupt request
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Generates a 32-bit random number.
+  * @note   Each time the random number data is read the RNG_FLAG_DRDY flag
+  *         is automatically cleared.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @param  random32bit pointer to generated random number variable if successful.
+  * @retval HAL status
+  */
+
+HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit)
+{
+  uint32_t tickstart;
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process Locked */
+  __HAL_LOCK(hrng);
+
+  /* Check RNG peripheral state */
+  if (hrng->State == HAL_RNG_STATE_READY)
+  {
+    /* Change RNG peripheral state */
+    hrng->State = HAL_RNG_STATE_BUSY;
+
+    /* Get tick */
+    tickstart = HAL_GetTick();
+
+    /* Check if data register contains valid random data */
+    while (__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
+    {
+      if ((HAL_GetTick() - tickstart) > RNG_TIMEOUT_VALUE)
+      {
+        hrng->State = HAL_RNG_STATE_READY;
+        hrng->ErrorCode |= HAL_RNG_ERROR_TIMEOUT;
+        /* Process Unlocked */
+        __HAL_UNLOCK(hrng);
+        return HAL_ERROR;
+      }
+    }
+
+    /* Get a 32bit Random number */
+    hrng->RandomNumber = hrng->Instance->DR;
+    *random32bit = hrng->RandomNumber;
+
+    hrng->State = HAL_RNG_STATE_READY;
+  }
+  else
+  {
+    status = HAL_ERROR;
+  }
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hrng);
+
+  return status;
+}
+
+/**
+  * @brief  Generates a 32-bit random number in interrupt mode.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process Locked */
+  __HAL_LOCK(hrng);
+
+  /* Check RNG peripheral state */
+  if (hrng->State == HAL_RNG_STATE_READY)
+  {
+    /* Change RNG peripheral state */
+    hrng->State = HAL_RNG_STATE_BUSY;
+
+    /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
+    __HAL_RNG_ENABLE_IT(hrng);
+  }
+  else
+  {
+    /* Process Unlocked */
+    __HAL_UNLOCK(hrng);
+
+    status = HAL_ERROR;
+  }
+
+  return status;
+}
+
+/**
+  * @brief  Handles RNG interrupt request.
+  * @note   In the case of a clock error, the RNG is no more able to generate
+  *         random numbers because the PLL48CLK clock is not correct. User has
+  *         to check that the clock controller is correctly configured to provide
+  *         the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
+  *         The clock error has no impact on the previously generated
+  *         random numbers, and the RNG_DR register contents can be used.
+  * @note   In the case of a seed error, the generation of random numbers is
+  *         interrupted as long as the SECS bit is '1'. If a number is
+  *         available in the RNG_DR register, it must not be used because it may
+  *         not have enough entropy. In this case, it is recommended to clear the
+  *         SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
+  *         the RNG peripheral to reinitialize and restart the RNG.
+  * @note   User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
+  *         or CEIS are set.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval None
+
+  */
+void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
+{
+  uint32_t rngclockerror = 0U;
+
+  /* RNG clock error interrupt occurred */
+  if (__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET)
+  {
+    rngclockerror = 1U;
+  }
+  else if (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET)
+  {
+    rngclockerror = 1U;
+  }
+  else
+  {
+    /* Nothing to do */
+  }
+
+  if (rngclockerror == 1U)
+  {
+    /* Change RNG peripheral state */
+    hrng->State = HAL_RNG_STATE_ERROR;
+
+#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
+    /* Call registered Error callback */
+    hrng->ErrorCallback(hrng);
+#else
+    /* Call legacy weak Error callback */
+    HAL_RNG_ErrorCallback(hrng);
+#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
+
+    /* Clear the clock error flag */
+    __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI | RNG_IT_SEI);
+  }
+
+  /* Check RNG data ready interrupt occurred */
+  if (__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
+  {
+    /* Generate random number once, so disable the IT */
+    __HAL_RNG_DISABLE_IT(hrng);
+
+    /* Get the 32bit Random number (DRDY flag automatically cleared) */
+    hrng->RandomNumber = hrng->Instance->DR;
+
+    if (hrng->State != HAL_RNG_STATE_ERROR)
+    {
+      /* Change RNG peripheral state */
+      hrng->State = HAL_RNG_STATE_READY;
+      /* Process Unlocked */
+      __HAL_UNLOCK(hrng);
+
+#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
+      /* Call registered Data Ready callback */
+      hrng->ReadyDataCallback(hrng, hrng->RandomNumber);
+#else
+      /* Call legacy weak Data Ready callback */
+      HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
+#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
+    }
+  }
+}
+
+/**
+  * @brief  Read latest generated random number.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval random value
+  */
+uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng)
+{
+  return (hrng->RandomNumber);
+}
+
+/**
+  * @brief  Data Ready callback in non-blocking mode.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @param  random32bit generated random number.
+  * @retval None
+  */
+__weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hrng);
+  UNUSED(random32bit);
+  /* NOTE : This function should not be modified. When the callback is needed,
+            function HAL_RNG_ReadyDataCallback must be implemented in the user file.
+   */
+}
+
+/**
+  * @brief  RNG error callbacks.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval None
+  */
+__weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hrng);
+  /* NOTE : This function should not be modified. When the callback is needed,
+            function HAL_RNG_ErrorCallback must be implemented in the user file.
+   */
+}
+/**
+  * @}
+  */
+
+
+/** @addtogroup RNG_Exported_Functions_Group3
+ *  @brief   Peripheral State functions
+ *
+@verbatim
+ ===============================================================================
+                      ##### Peripheral State functions #####
+ ===============================================================================
+    [..]
+    This subsection permits to get in run-time the status of the peripheral
+    and the data flow.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Returns the RNG state.
+  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
+  *                the configuration information for RNG.
+  * @retval HAL state
+  */
+HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
+{
+  return hrng->State;
+}
+
+/**
+  * @brief  Return the RNG handle error code.
+  * @param  hrng: pointer to a RNG_HandleTypeDef structure.
+  * @retval RNG Error Code
+*/
+uint32_t HAL_RNG_GetError(RNG_HandleTypeDef *hrng)
+{
+  /* Return RNG Error Code */
+  return hrng->ErrorCode;
+}
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+
+#endif /* HAL_RNG_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+#endif /* RNG */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/