diff options
Diffstat (limited to 'bsps/arm/stm32h7/hal/stm32h7xx_hal_rng.c')
| -rw-r--r-- | bsps/arm/stm32h7/hal/stm32h7xx_hal_rng.c | 927 |
1 files changed, 927 insertions, 0 deletions
diff --git a/bsps/arm/stm32h7/hal/stm32h7xx_hal_rng.c b/bsps/arm/stm32h7/hal/stm32h7xx_hal_rng.c new file mode 100644 index 0000000000..b4585ccb98 --- /dev/null +++ b/bsps/arm/stm32h7/hal/stm32h7xx_hal_rng.c @@ -0,0 +1,927 @@ +/**
+ ******************************************************************************
+ * @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>© 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 -----------------------------------------------------------*/
+/** @defgroup RNG_Private_Defines
+ * @{
+ */
+/* Health test control register information to use in CCM algorithm */
+#define RNG_HTCFG_1 0x17590ABCU /*!< magic number */
+#if defined(RNG_VER_3_1) || defined(RNG_VER_3_0)
+#define RNG_HTCFG 0x000CAA74U /*!< for best latency and To be compliant with NIST */
+#else /*RNG_VER_3_2*/
+#define RNG_HTCFG 0x00007274U /*!< for best latency and To be compliant with NIST */
+#endif
+/**
+ * @}
+ */
+/* 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)
+{
+ uint32_t tickstart;
+ /* 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;
+
+#if defined(RNG_CR_CONDRST)
+ /* Disable RNG */
+ __HAL_RNG_DISABLE(hrng);
+
+ /* Clock Error Detection Configuration when CONDRT bit is set to 1 */
+ MODIFY_REG(hrng->Instance->CR, RNG_CR_CED | RNG_CR_CONDRST, hrng->Init.ClockErrorDetection | RNG_CR_CONDRST);
+
+#if defined(RNG_VER_3_2) || defined(RNG_VER_3_1) || defined(RNG_VER_3_0)
+ /*!< magic number must be written immediately before to RNG_HTCRG */
+ WRITE_REG(hrng->Instance->HTCR, RNG_HTCFG_1);
+ /* for best latency and to be compliant with NIST */
+ WRITE_REG(hrng->Instance->HTCR, RNG_HTCFG);
+#endif
+
+ /* Writing bits CONDRST=0*/
+ CLEAR_BIT(hrng->Instance->CR, RNG_CR_CONDRST);
+
+ /* Get tick */
+ tickstart = HAL_GetTick();
+
+ /* Wait for conditioning reset process to be completed */
+ while (HAL_IS_BIT_SET(hrng->Instance->CR, RNG_CR_CONDRST))
+ {
+ if ((HAL_GetTick() - tickstart) > RNG_TIMEOUT_VALUE)
+ {
+ hrng->State = HAL_RNG_STATE_READY;
+ hrng->ErrorCode = HAL_RNG_ERROR_TIMEOUT;
+ return HAL_ERROR;
+ }
+ }
+#else
+ /* Clock Error Detection Configuration */
+ MODIFY_REG(hrng->Instance->CR, RNG_CR_CED, hrng->Init.ClockErrorDetection);
+#endif /* end of RNG_CR_CONDRST */
+
+ /* Enable the RNG Peripheral */
+ __HAL_RNG_ENABLE(hrng);
+
+ /* verify that no seed error */
+ if (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET)
+ {
+ hrng->State = HAL_RNG_STATE_ERROR;
+ return HAL_ERROR;
+ }
+ /* Get tick */
+ tickstart = HAL_GetTick();
+ /* Check if data register contains valid random data */
+ while (__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_SECS) != RESET)
+ {
+ if ((HAL_GetTick() - tickstart) > RNG_TIMEOUT_VALUE)
+ {
+ hrng->State = HAL_RNG_STATE_ERROR;
+ hrng->ErrorCode = HAL_RNG_ERROR_TIMEOUT;
+ return HAL_ERROR;
+ }
+ }
+
+ /* 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)
+{
+#if defined(RNG_CR_CONDRST)
+ uint32_t tickstart;
+
+#endif /* RNG_CR_CONDRST */
+ /* Check the RNG handle allocation */
+ if (hrng == NULL)
+ {
+ return HAL_ERROR;
+ }
+
+#if defined(RNG_CR_CONDRST)
+ /* Clear Clock Error Detection bit when CONDRT bit is set to 1 */
+ MODIFY_REG(hrng->Instance->CR, RNG_CR_CED | RNG_CR_CONDRST, RNG_CED_ENABLE | RNG_CR_CONDRST);
+
+ /* Writing bits CONDRST=0*/
+ CLEAR_BIT(hrng->Instance->CR, RNG_CR_CONDRST);
+
+ /* Get tick */
+ tickstart = HAL_GetTick();
+
+ /* Wait for conditioning reset process to be completed */
+ while (HAL_IS_BIT_SET(hrng->Instance->CR, RNG_CR_CONDRST))
+ {
+ 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;
+ }
+ }
+
+#else
+ /* Clear Clock Error Detection bit */
+ CLEAR_BIT(hrng->Instance->CR, RNG_CR_CED);
+#endif /* RNG_CR_CONDRST */
+ /* 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 This function checks value of RNG_FLAG_DRDY flag to know if valid
+ * random number is available in the DR register (RNG_FLAG_DRDY flag set
+ * whenever a random number is available through the RNG_DR register).
+ * After transitioning from 0 to 1 (random number available),
+ * RNG_FLAG_DRDY flag remains high until output buffer becomes empty after reading
+ * four words from the RNG_DR register, i.e. further function calls
+ * will immediately return a new u32 random number (additional words are
+ * available and can be read by the application, till RNG_FLAG_DRDY flag remains high).
+ * @note When no more random number data is available in DR register, 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
+ {
+ 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 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);
+ }
+
+ /* 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.
+ * @note When RNG_FLAG_DRDY flag value is set, first random number has been read
+ * from DR register in IRQ Handler and is provided as callback parameter.
+ * Depending on valid data available in the conditioning output buffer,
+ * additional words can be read by the application from DR register till
+ * DRDY bit remains high.
+ * @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****/
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