/** ****************************************************************************** * @file stm32f4xx_hal_rng.c * @author MCD Application Team * @version V1.7.1 * @date 14-April-2017 * @brief RNG HAL module driver. * This file provides firmware functions to manage the following * functionalities of the Random Number Generator (RNG) peripheral: * + Initialization/de-initialization 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. @endverbatim ****************************************************************************** * @attention * *

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* * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ //#include "stm32f4xx_hal.h" #include "stm32f4xx_hal_rng.h" /** @addtogroup STM32F4xx_HAL_Driver * @{ */ /** @addtogroup RNG * @{ */ //#ifdef HAL_RNG_MODULE_ENABLED #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx) ||\ defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx) ||\ defined(STM32F410Tx) || defined(STM32F410Cx) || defined(STM32F410Rx) || defined(STM32F469xx) ||\ defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx) || defined(STM32F412Rx) ||\ defined(STM32F412Cx) || defined(STM32F413xx) || defined(STM32F423xx) /* Private types -------------------------------------------------------------*/ /* Private defines -----------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private constants ---------------------------------------------------------*/ /** @addtogroup 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 de-initialization functions * @verbatim =============================================================================== ##### Initialization and de-initialization 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; } __HAL_LOCK(hrng); 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); } /* 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; __HAL_UNLOCK(hrng); /* 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); /* DeInit the low level hardware */ HAL_RNG_MspDeInit(hrng); /* Update the RNG state */ hrng->State = HAL_RNG_STATE_RESET; /* 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. */ } /** * @} */ /** @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 = 0U; 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_ERROR; /* Process Unlocked */ __HAL_UNLOCK(hrng); return HAL_TIMEOUT; } } /* 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; /* Process Unlocked */ __HAL_UNLOCK(hrng); /* 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) { /* RNG clock error interrupt occurred */ if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET)) { /* Change RNG peripheral state */ hrng->State = HAL_RNG_STATE_ERROR; HAL_RNG_ErrorCallback(hrng); /* 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; /* Data Ready callback */ HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber); } } } /** * @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 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; } /** * @} */ /** * @} */ #endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\ STM32F429xx || STM32F439xx || STM32F410xx || STM32F469xx || STM32F479xx || STM32F412Zx ||\ STM32F412Vx || STM32F412Rx || STM32F412Cx || STM32F413xx || STM32F423xx */ //#endif /* HAL_RNG_MODULE_ENABLED */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/