| /** |
| ****************************************************************************** |
| * @file stm32f2xx_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>© Copyright (c) 2016 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 "stm32f2xx_hal.h" |
| |
| /** @addtogroup STM32F2xx_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)); |
| |
| #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; |
| |
| |
| /* 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; |
| } |
| |
| /* 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) |
| { |
| /* New check to avoid false timeout detection in case of preemption */ |
| if (__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET) |
| { |
| 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 |
| { |
| hrng->ErrorCode = HAL_RNG_ERROR_BUSY; |
| 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); |
| |
| hrng->ErrorCode = HAL_RNG_ERROR_BUSY; |
| status = HAL_ERROR; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @brief Returns generated random number in polling mode (Obsolete) |
| * Use HAL_RNG_GenerateRandomNumber() API instead. |
| * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
| * the configuration information for RNG. |
| * @retval Random value |
| */ |
| uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng) |
| { |
| if (HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK) |
| { |
| return hrng->RandomNumber; |
| } |
| else |
| { |
| return 0U; |
| } |
| } |
| |
| /** |
| * @brief Returns a 32-bit random number with interrupt enabled (Obsolete), |
| * Use HAL_RNG_GenerateRandomNumber_IT() API instead. |
| * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
| * the configuration information for RNG. |
| * @retval 32-bit random number |
| */ |
| uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng) |
| { |
| uint32_t random32bit = 0U; |
| |
| /* Process locked */ |
| __HAL_LOCK(hrng); |
| |
| /* Change RNG peripheral state */ |
| hrng->State = HAL_RNG_STATE_BUSY; |
| |
| /* Get a 32bit Random number */ |
| random32bit = hrng->Instance->DR; |
| |
| /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */ |
| __HAL_RNG_ENABLE_IT(hrng); |
| |
| /* Return the 32 bit random number */ |
| return random32bit; |
| } |
| |
| /** |
| * @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) |
| { |
| /* Update the error code */ |
| hrng->ErrorCode = HAL_RNG_ERROR_CLOCK; |
| rngclockerror = 1U; |
| } |
| else if (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET) |
| { |
| /* Update the error code */ |
| hrng->ErrorCode = HAL_RNG_ERROR_SEED; |
| 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); |
| |
| return; |
| } |
| |
| /* 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****/ |