view Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c @ 909:6902bb4b6b2e Evo_2_23

Define state of new GPIO out pins: Some new GPIO pins were initialized but not used. This may cause some random activations e.g. of the red debug LED. To avoid this the output levels are set to inactive levels (e.g. to LED_OFF)
author Ideenmodellierer
date Tue, 15 Oct 2024 19:07:19 +0200
parents c78bcbd5deda
children
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/**
  ******************************************************************************
  * @file    stm32f4xx_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/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
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * 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"

/** @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;
  }

  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;

  /* 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****/