ref: 4546c5b04d9ed617a64970568acd58eef8d0666e
dir: /demos/stm32f429_disco/stm/stm32f4_spl/src/stm32f4xx_hal_rng.c/
/**
******************************************************************************
* @file stm32f4xx_hal_rng.c
* @author MCD Application Team
* @version V1.0.0
* @date 18-February-2014
* @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 __RNG_CLK_ENABLE() macro.
(#) Activate the RNG peripheral using __HAL_RNG_ENABLE() macro.
(#) 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_GetRandomNumber() function.
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT(c) 2014 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
* @{
*/
/** @defgroup RNG
* @brief RNG HAL module driver.
* @{
*/
#ifdef HAL_RNG_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define RNG_TIMEOUT_VALUE 1000
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup RNG_Private_Functions
* @{
*/
/** @defgroup RNG_Group1 Initialization and de-initialization functions
* @brief Initialization and Configuration 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 according to the specified
* parameters in the RNG_InitTypeDef and creates the associated handle.
* @param hrng: RNG handle
* @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)
{
/* Init the low level hardware */
HAL_RNG_MspInit(hrng);
}
/* 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: RNG handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
{
/* Check the RNG peripheral state */
if(hrng->State == HAL_RNG_STATE_BUSY)
{
return HAL_BUSY;
}
/* Update the RNG state */
hrng->State = HAL_RNG_STATE_BUSY;
/* Disable the RNG Peripheral */
__HAL_RNG_DISABLE(hrng);
/* Set the RNG registers to their reset values */
hrng->Instance->CR &= 0xFFFFFFF3;
hrng->Instance->SR &= 0xFFFFFF98;
hrng->Instance->DR &= 0x0;
/* 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: RNG handle
* @retval None
*/
__weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_RNG_MspInit could be implemented in the user file
*/
}
/**
* @brief DeInitializes the RNG MSP.
* @param hrng: RNG handle
* @retval None
*/
__weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_RNG_MspDeInit could be implemented in the user file
*/
}
/**
* @}
*/
/** @defgroup RNG_Group2 Peripheral Control functions
* @brief management 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 Returns a 32-bit random number.
* @note Each time the random number data is read the RNG_FLAG_DRDY flag
* is automatically cleared.
* @param hrng: RNG handle
* @retval 32-bit random number
*/
uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng)
{
uint32_t random32bit = 0;
uint32_t timeout = 0;
/* Process Locked */
__HAL_LOCK(hrng);
timeout = HAL_GetTick() + RNG_TIMEOUT_VALUE;
/* Check if data register contains valid random data */
while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
{
if(HAL_GetTick() >= timeout)
{
return HAL_TIMEOUT;
}
}
/* Get a 32bit Random number */
random32bit = hrng->Instance->DR;
/* Process Unlocked */
__HAL_UNLOCK(hrng);
/* Return the 32 bit random number */
return random32bit;
}
/**
* @brief Returns a 32-bit random number with interrupt enabled.
* @param hrng: RNG handle
* @retval 32-bit random number
*/
uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng)
{
uint32_t random32bit = 0;
/* 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_FLAG().
* 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_FLAG(), then disable and enable
* the RNG peripheral to reinitialize and restart the RNG.
* @param hrng: RNG handle
* @retval None
*/
void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
{
/* RNG clock error interrupt occured */
if(__HAL_RNG_GET_FLAG(hrng, RNG_IT_CEI) != RESET)
{
HAL_RNG_ErrorCallback(hrng);
/* Clear the clock error flag */
__HAL_RNG_CLEAR_FLAG(hrng, RNG_IT_CEI);
/* Change RNG peripheral state */
hrng->State = HAL_RNG_STATE_ERROR;
/* Process Unlocked */
__HAL_UNLOCK(hrng);
}
/* RNG seed error interrupt occured */
if(__HAL_RNG_GET_FLAG(hrng, RNG_IT_SEI) != RESET)
{
HAL_RNG_ErrorCallback(hrng);
/* Clear the seed error flag */
__HAL_RNG_CLEAR_FLAG(hrng, RNG_IT_SEI);
/* Change RNG peripheral state */
hrng->State = HAL_RNG_STATE_ERROR;
/* Process Unlocked */
__HAL_UNLOCK(hrng);
}
/* Check RNG data ready flag */
if(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) != RESET)
{
/* Data Ready callback */
HAL_RNG_ReadyCallback(hrng);
/* Change RNG peripheral state */
hrng->State = HAL_RNG_STATE_READY;
/* Clear the RNG Data Ready flag */
__HAL_RNG_CLEAR_FLAG(hrng, RNG_FLAG_DRDY);
/* Process Unlocked */
__HAL_UNLOCK(hrng);
}
}
/**
* @brief Data Ready callback in non-blocking mode.
* @param hrng: RNG handle
* @retval None
*/
__weak void HAL_RNG_ReadyCallback(RNG_HandleTypeDef* hrng)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_RNG_ReadyCallback could be implemented in the user file
*/
}
/**
* @brief RNG error callbacks.
* @param hrng: RNG handle
* @retval None
*/
__weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_RNG_ErrorCallback could be implemented in the user file
*/
}
/**
* @}
*/
/** @defgroup RNG_Group3 Peripheral State functions
* @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: RNG handle
* @retval HAL state
*/
HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
{
return hrng->State;
}
/**
* @}
*/
/**
* @}
*/
#endif /* HAL_RNG_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/