[303] | 1 | /**
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| 2 | ******************************************************************************
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| 3 | * @file stm32f4xx_hal_rng.c
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| 4 | * @author MCD Application Team
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| 5 | * @version V1.4.1
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| 6 | * @date 09-October-2015
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| 7 | * @brief RNG HAL module driver.
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| 8 | * This file provides firmware functions to manage the following
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| 9 | * functionalities of the Random Number Generator (RNG) peripheral:
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| 10 | * + Initialization/de-initialization functions
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| 11 | * + Peripheral Control functions
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| 12 | * + Peripheral State functions
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| 13 | *
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| 14 | @verbatim
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| 15 | ==============================================================================
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| 16 | ##### How to use this driver #####
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| 17 | ==============================================================================
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| 18 | [..]
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| 19 | The RNG HAL driver can be used as follows:
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| 20 |
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| 21 | (#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro
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| 22 | in HAL_RNG_MspInit().
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| 23 | (#) Activate the RNG peripheral using HAL_RNG_Init() function.
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| 24 | (#) Wait until the 32 bit Random Number Generator contains a valid
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| 25 | random data using (polling/interrupt) mode.
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| 26 | (#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function.
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| 27 |
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| 28 | @endverbatim
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| 29 | ******************************************************************************
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| 30 | * @attention
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| 31 | *
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| 32 | * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
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| 33 | *
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| 34 | * Redistribution and use in source and binary forms, with or without modification,
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| 35 | * are permitted provided that the following conditions are met:
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| 36 | * 1. Redistributions of source code must retain the above copyright notice,
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| 37 | * this list of conditions and the following disclaimer.
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| 38 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 39 | * this list of conditions and the following disclaimer in the documentation
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| 40 | * and/or other materials provided with the distribution.
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| 41 | * 3. Neither the name of STMicroelectronics nor the names of its contributors
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| 42 | * may be used to endorse or promote products derived from this software
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| 43 | * without specific prior written permission.
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| 44 | *
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| 45 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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| 46 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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| 48 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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| 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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| 51 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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| 52 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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| 53 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 54 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 55 | *
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| 56 | ******************************************************************************
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| 57 | */
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| 58 |
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| 59 | /* Includes ------------------------------------------------------------------*/
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| 60 | #include "stm32f4xx_hal.h"
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| 61 |
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| 62 | /** @addtogroup STM32F4xx_HAL_Driver
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| 63 | * @{
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| 64 | */
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| 65 |
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| 66 | /** @addtogroup RNG
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| 67 | * @{
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| 68 | */
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| 69 |
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| 70 | #ifdef HAL_RNG_MODULE_ENABLED
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| 71 |
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| 72 | #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx) ||\
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| 73 | defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx) ||\
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| 74 | defined(STM32F410Tx) || defined(STM32F410Cx) || defined(STM32F410Rx) || defined(STM32F469xx) ||\
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| 75 | defined(STM32F479xx)
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| 76 |
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| 77 |
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| 78 | /* Private types -------------------------------------------------------------*/
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| 79 | /* Private defines -----------------------------------------------------------*/
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| 80 | /* Private variables ---------------------------------------------------------*/
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| 81 | /* Private constants ---------------------------------------------------------*/
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| 82 | /** @addtogroup RNG_Private_Constants
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| 83 | * @{
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| 84 | */
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| 85 | #define RNG_TIMEOUT_VALUE 2
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| 86 | /**
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| 87 | * @}
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| 88 | */
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| 89 | /* Private macros ------------------------------------------------------------*/
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| 90 | /* Private functions prototypes ----------------------------------------------*/
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| 91 | /* Private functions ---------------------------------------------------------*/
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| 92 | /* Exported functions --------------------------------------------------------*/
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| 93 |
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| 94 | /** @addtogroup RNG_Exported_Functions
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| 95 | * @{
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| 96 | */
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| 97 |
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| 98 | /** @addtogroup RNG_Exported_Functions_Group1
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| 99 | * @brief Initialization and de-initialization functions
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| 100 | *
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| 101 | @verbatim
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| 102 | ===============================================================================
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| 103 | ##### Initialization and de-initialization functions #####
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| 104 | ===============================================================================
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| 105 | [..] This section provides functions allowing to:
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| 106 | (+) Initialize the RNG according to the specified parameters
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| 107 | in the RNG_InitTypeDef and create the associated handle
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| 108 | (+) DeInitialize the RNG peripheral
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| 109 | (+) Initialize the RNG MSP
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| 110 | (+) DeInitialize RNG MSP
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| 111 |
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| 112 | @endverbatim
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| 113 | * @{
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| 114 | */
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| 115 |
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| 116 | /**
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| 117 | * @brief Initializes the RNG peripheral and creates the associated handle.
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| 118 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 119 | * the configuration information for RNG.
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| 120 | * @retval HAL status
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| 121 | */
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| 122 | HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng)
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| 123 | {
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| 124 | /* Check the RNG handle allocation */
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| 125 | if(hrng == NULL)
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| 126 | {
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| 127 | return HAL_ERROR;
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| 128 | }
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| 129 |
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| 130 | __HAL_LOCK(hrng);
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| 131 |
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| 132 | if(hrng->State == HAL_RNG_STATE_RESET)
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| 133 | {
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| 134 | /* Allocate lock resource and initialize it */
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| 135 | hrng->Lock = HAL_UNLOCKED;
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| 136 | /* Init the low level hardware */
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| 137 | HAL_RNG_MspInit(hrng);
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| 138 | }
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| 139 |
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| 140 | /* Change RNG peripheral state */
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| 141 | hrng->State = HAL_RNG_STATE_BUSY;
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| 142 |
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| 143 | /* Enable the RNG Peripheral */
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| 144 | __HAL_RNG_ENABLE(hrng);
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| 145 |
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| 146 | /* Initialize the RNG state */
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| 147 | hrng->State = HAL_RNG_STATE_READY;
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| 148 |
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| 149 | __HAL_UNLOCK(hrng);
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| 150 |
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| 151 | /* Return function status */
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| 152 | return HAL_OK;
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| 153 | }
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| 154 |
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| 155 | /**
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| 156 | * @brief DeInitializes the RNG peripheral.
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| 157 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 158 | * the configuration information for RNG.
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| 159 | * @retval HAL status
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| 160 | */
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| 161 | HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
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| 162 | {
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| 163 | /* Check the RNG handle allocation */
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| 164 | if(hrng == NULL)
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| 165 | {
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| 166 | return HAL_ERROR;
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| 167 | }
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| 168 | /* Disable the RNG Peripheral */
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| 169 | CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN);
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| 170 |
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| 171 | /* Clear RNG interrupt status flags */
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| 172 | CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS);
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| 173 |
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| 174 | /* DeInit the low level hardware */
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| 175 | HAL_RNG_MspDeInit(hrng);
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| 176 |
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| 177 | /* Update the RNG state */
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| 178 | hrng->State = HAL_RNG_STATE_RESET;
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| 179 |
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| 180 | /* Release Lock */
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| 181 | __HAL_UNLOCK(hrng);
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| 182 |
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| 183 | /* Return the function status */
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| 184 | return HAL_OK;
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| 185 | }
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| 186 |
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| 187 | /**
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| 188 | * @brief Initializes the RNG MSP.
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| 189 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 190 | * the configuration information for RNG.
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| 191 | * @retval None
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| 192 | */
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| 193 | __weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
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| 194 | {
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| 195 | /* NOTE : This function should not be modified. When the callback is needed,
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| 196 | function HAL_RNG_MspInit must be implemented in the user file.
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| 197 | */
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| 198 | }
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| 199 |
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| 200 | /**
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| 201 | * @brief DeInitializes the RNG MSP.
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| 202 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 203 | * the configuration information for RNG.
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| 204 | * @retval None
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| 205 | */
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| 206 | __weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
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| 207 | {
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| 208 | /* NOTE : This function should not be modified. When the callback is needed,
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| 209 | function HAL_RNG_MspDeInit must be implemented in the user file.
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| 210 | */
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| 211 | }
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| 212 |
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| 213 | /**
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| 214 | * @}
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| 215 | */
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| 216 |
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| 217 | /** @addtogroup RNG_Exported_Functions_Group2
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| 218 | * @brief Peripheral Control functions
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| 219 | *
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| 220 | @verbatim
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| 221 | ===============================================================================
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| 222 | ##### Peripheral Control functions #####
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| 223 | ===============================================================================
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| 224 | [..] This section provides functions allowing to:
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| 225 | (+) Get the 32 bit Random number
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| 226 | (+) Get the 32 bit Random number with interrupt enabled
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| 227 | (+) Handle RNG interrupt request
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| 228 |
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| 229 | @endverbatim
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| 230 | * @{
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| 231 | */
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| 232 |
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| 233 | /**
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| 234 | * @brief Generates a 32-bit random number.
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| 235 | * @note Each time the random number data is read the RNG_FLAG_DRDY flag
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| 236 | * is automatically cleared.
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| 237 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 238 | * the configuration information for RNG.
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| 239 | * @param random32bit: pointer to generated random number variable if successful.
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| 240 | * @retval HAL status
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| 241 | */
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| 242 |
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| 243 | HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit)
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| 244 | {
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| 245 | uint32_t tickstart = 0;
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| 246 | HAL_StatusTypeDef status = HAL_OK;
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| 247 |
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| 248 | /* Process Locked */
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| 249 | __HAL_LOCK(hrng);
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| 250 |
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| 251 | /* Check RNG peripheral state */
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| 252 | if(hrng->State == HAL_RNG_STATE_READY)
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| 253 | {
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| 254 | /* Change RNG peripheral state */
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| 255 | hrng->State = HAL_RNG_STATE_BUSY;
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| 256 |
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| 257 | /* Get tick */
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| 258 | tickstart = HAL_GetTick();
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| 259 |
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| 260 | /* Check if data register contains valid random data */
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| 261 | while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
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| 262 | {
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| 263 | if((HAL_GetTick() - tickstart ) > RNG_TIMEOUT_VALUE)
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| 264 | {
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| 265 | hrng->State = HAL_RNG_STATE_ERROR;
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| 266 |
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| 267 | /* Process Unlocked */
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| 268 | __HAL_UNLOCK(hrng);
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| 269 |
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| 270 | return HAL_TIMEOUT;
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| 271 | }
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| 272 | }
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| 273 |
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| 274 | /* Get a 32bit Random number */
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| 275 | hrng->RandomNumber = hrng->Instance->DR;
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| 276 | *random32bit = hrng->RandomNumber;
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| 277 |
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| 278 | hrng->State = HAL_RNG_STATE_READY;
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| 279 | }
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| 280 | else
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| 281 | {
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| 282 | status = HAL_ERROR;
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| 283 | }
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| 284 |
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| 285 | /* Process Unlocked */
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| 286 | __HAL_UNLOCK(hrng);
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| 287 |
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| 288 | return status;
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| 289 | }
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| 290 |
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| 291 | /**
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| 292 | * @brief Generates a 32-bit random number in interrupt mode.
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| 293 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 294 | * the configuration information for RNG.
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| 295 | * @retval HAL status
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| 296 | */
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| 297 | HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng)
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| 298 | {
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| 299 | HAL_StatusTypeDef status = HAL_OK;
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| 300 |
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| 301 | /* Process Locked */
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| 302 | __HAL_LOCK(hrng);
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| 303 |
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| 304 | /* Check RNG peripheral state */
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| 305 | if(hrng->State == HAL_RNG_STATE_READY)
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| 306 | {
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| 307 | /* Change RNG peripheral state */
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| 308 | hrng->State = HAL_RNG_STATE_BUSY;
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| 309 |
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| 310 | /* Process Unlocked */
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| 311 | __HAL_UNLOCK(hrng);
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| 312 |
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| 313 | /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
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| 314 | __HAL_RNG_ENABLE_IT(hrng);
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| 315 | }
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| 316 | else
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| 317 | {
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| 318 | /* Process Unlocked */
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| 319 | __HAL_UNLOCK(hrng);
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| 320 |
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| 321 | status = HAL_ERROR;
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| 322 | }
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| 323 |
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| 324 | return status;
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| 325 | }
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| 326 |
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| 327 | /**
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| 328 | * @brief Handles RNG interrupt request.
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| 329 | * @note In the case of a clock error, the RNG is no more able to generate
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| 330 | * random numbers because the PLL48CLK clock is not correct. User has
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| 331 | * to check that the clock controller is correctly configured to provide
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| 332 | * the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
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| 333 | * The clock error has no impact on the previously generated
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| 334 | * random numbers, and the RNG_DR register contents can be used.
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| 335 | * @note In the case of a seed error, the generation of random numbers is
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| 336 | * interrupted as long as the SECS bit is '1'. If a number is
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| 337 | * available in the RNG_DR register, it must not be used because it may
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| 338 | * not have enough entropy. In this case, it is recommended to clear the
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| 339 | * SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
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| 340 | * the RNG peripheral to reinitialize and restart the RNG.
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| 341 | * @note User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
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| 342 | * or CEIS are set.
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| 343 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 344 | * the configuration information for RNG.
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| 345 | * @retval None
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| 346 |
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| 347 | */
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| 348 | void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
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| 349 | {
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| 350 | /* RNG clock error interrupt occurred */
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| 351 | if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET))
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| 352 | {
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| 353 | /* Change RNG peripheral state */
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| 354 | hrng->State = HAL_RNG_STATE_ERROR;
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| 355 |
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| 356 | HAL_RNG_ErrorCallback(hrng);
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| 357 |
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| 358 | /* Clear the clock error flag */
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| 359 | __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI);
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| 360 |
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| 361 | }
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| 362 |
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| 363 | /* Check RNG data ready interrupt occurred */
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| 364 | if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
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| 365 | {
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| 366 | /* Generate random number once, so disable the IT */
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| 367 | __HAL_RNG_DISABLE_IT(hrng);
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| 368 |
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| 369 | /* Get the 32bit Random number (DRDY flag automatically cleared) */
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| 370 | hrng->RandomNumber = hrng->Instance->DR;
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| 371 |
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| 372 | if(hrng->State != HAL_RNG_STATE_ERROR)
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| 373 | {
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| 374 | /* Change RNG peripheral state */
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| 375 | hrng->State = HAL_RNG_STATE_READY;
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| 376 |
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| 377 | /* Data Ready callback */
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| 378 | HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
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| 379 | }
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| 380 | }
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| 381 | }
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| 382 |
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| 383 | /**
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| 384 | * @brief Returns generated random number in polling mode (Obsolete)
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| 385 | * Use HAL_RNG_GenerateRandomNumber() API instead.
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| 386 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 387 | * the configuration information for RNG.
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| 388 | * @retval Random value
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| 389 | */
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| 390 | uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng)
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| 391 | {
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| 392 | if(HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK)
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| 393 | {
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| 394 | return hrng->RandomNumber;
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| 395 | }
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| 396 | else
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| 397 | {
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| 398 | return 0;
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| 399 | }
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| 400 | }
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| 401 |
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| 402 | /**
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| 403 | * @brief Returns a 32-bit random number with interrupt enabled (Obsolete),
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| 404 | * Use HAL_RNG_GenerateRandomNumber_IT() API instead.
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| 405 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 406 | * the configuration information for RNG.
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| 407 | * @retval 32-bit random number
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| 408 | */
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| 409 | uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng)
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| 410 | {
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| 411 | uint32_t random32bit = 0;
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| 412 |
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| 413 | /* Process locked */
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| 414 | __HAL_LOCK(hrng);
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| 415 |
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| 416 | /* Change RNG peripheral state */
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| 417 | hrng->State = HAL_RNG_STATE_BUSY;
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| 418 |
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| 419 | /* Get a 32bit Random number */
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| 420 | random32bit = hrng->Instance->DR;
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| 421 |
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| 422 | /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
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| 423 | __HAL_RNG_ENABLE_IT(hrng);
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| 424 |
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| 425 | /* Return the 32 bit random number */
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| 426 | return random32bit;
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| 427 | }
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| 428 |
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| 429 | /**
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| 430 | * @brief Read latest generated random number.
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| 431 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 432 | * the configuration information for RNG.
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| 433 | * @retval random value
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| 434 | */
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| 435 | uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng)
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| 436 | {
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| 437 | return(hrng->RandomNumber);
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| 438 | }
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| 439 |
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| 440 | /**
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| 441 | * @brief Data Ready callback in non-blocking mode.
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| 442 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 443 | * the configuration information for RNG.
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| 444 | * @param random32bit: generated random number.
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| 445 | * @retval None
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| 446 | */
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| 447 | __weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit)
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| 448 | {
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| 449 | /* NOTE : This function should not be modified. When the callback is needed,
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| 450 | function HAL_RNG_ReadyDataCallback must be implemented in the user file.
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| 451 | */
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| 452 | }
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| 453 |
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| 454 | /**
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| 455 | * @brief RNG error callbacks.
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| 456 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 457 | * the configuration information for RNG.
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| 458 | * @retval None
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| 459 | */
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| 460 | __weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
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| 461 | {
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| 462 | /* NOTE : This function should not be modified. When the callback is needed,
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| 463 | function HAL_RNG_ErrorCallback must be implemented in the user file.
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| 464 | */
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| 465 | }
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| 466 | /**
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| 467 | * @}
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| 468 | */
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| 469 |
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| 470 |
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| 471 | /** @addtogroup RNG_Exported_Functions_Group3
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| 472 | * @brief Peripheral State functions
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| 473 | *
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| 474 | @verbatim
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| 475 | ===============================================================================
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| 476 | ##### Peripheral State functions #####
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| 477 | ===============================================================================
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| 478 | [..]
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| 479 | This subsection permits to get in run-time the status of the peripheral
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| 480 | and the data flow.
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| 481 |
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| 482 | @endverbatim
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| 483 | * @{
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| 484 | */
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| 485 |
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| 486 | /**
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| 487 | * @brief Returns the RNG state.
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| 488 | * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
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| 489 | * the configuration information for RNG.
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| 490 | * @retval HAL state
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| 491 | */
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| 492 | HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
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| 493 | {
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| 494 | return hrng->State;
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| 495 | }
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| 496 |
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| 497 | /**
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| 498 | * @}
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| 499 | */
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| 500 |
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| 501 | /**
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| 502 | * @}
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| 503 | */
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| 504 |
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| 505 | #endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\
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| 506 | STM32F429xx || STM32F439xx || STM32F410xx || STM32F469xx || STM32F479xx */
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| 507 |
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| 508 | #endif /* HAL_RNG_MODULE_ENABLED */
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| 509 |
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| 510 | /**
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| 511 | * @}
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| 512 | */
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| 513 |
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| 514 | /**
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| 515 | * @}
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| 516 | */
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| 517 |
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| 518 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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