Aditya Mehrotra / mbed-dev

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Dependents:   CAN_TEST SPIne_Plus_DYNO_SENSORS SPIne_Plus_v2 SPIne_Plus_Dyno_v2

targets/TARGET_STM/TARGET_STM32F7/device/stm32f7xx_hal_rng.c@0:083111ae2a11, 2020-11-26 (annotated)

Committer:
saloutos
Date:
Thu Nov 26 04:08:56 2020 +0000
Revision:
0:083111ae2a11
first commit of leaned mbed dev lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saloutos 0:083111ae2a11 1 /**
saloutos 0:083111ae2a11 2 ******************************************************************************
saloutos 0:083111ae2a11 3 * @file stm32f7xx_hal_rng.c
saloutos 0:083111ae2a11 4 * @author MCD Application Team
saloutos 0:083111ae2a11 5 * @version V1.2.2
saloutos 0:083111ae2a11 6 * @date 14-April-2017
saloutos 0:083111ae2a11 7 * @brief RNG HAL module driver.
saloutos 0:083111ae2a11 8 * This file provides firmware functions to manage the following
saloutos 0:083111ae2a11 9 * functionalities of the Random Number Generator (RNG) peripheral:
saloutos 0:083111ae2a11 10 * + Initialization/de-initialization functions
saloutos 0:083111ae2a11 11 * + Peripheral Control functions
saloutos 0:083111ae2a11 12 * + Peripheral State functions
saloutos 0:083111ae2a11 13 *
saloutos 0:083111ae2a11 14 @verbatim
saloutos 0:083111ae2a11 15 ==============================================================================
saloutos 0:083111ae2a11 16 ##### How to use this driver #####
saloutos 0:083111ae2a11 17 ==============================================================================
saloutos 0:083111ae2a11 18 [..]
saloutos 0:083111ae2a11 19 The RNG HAL driver can be used as follows:
saloutos 0:083111ae2a11 20
saloutos 0:083111ae2a11 21 (#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro
saloutos 0:083111ae2a11 22 in HAL_RNG_MspInit().
saloutos 0:083111ae2a11 23 (#) Activate the RNG peripheral using HAL_RNG_Init() function.
saloutos 0:083111ae2a11 24 (#) Wait until the 32 bit Random Number Generator contains a valid
saloutos 0:083111ae2a11 25 random data using (polling/interrupt) mode.
saloutos 0:083111ae2a11 26 (#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function.
saloutos 0:083111ae2a11 27
saloutos 0:083111ae2a11 28 @endverbatim
saloutos 0:083111ae2a11 29 ******************************************************************************
saloutos 0:083111ae2a11 30 * @attention
saloutos 0:083111ae2a11 31 *
saloutos 0:083111ae2a11 32 * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
saloutos 0:083111ae2a11 33 *
saloutos 0:083111ae2a11 34 * Redistribution and use in source and binary forms, with or without modification,
saloutos 0:083111ae2a11 35 * are permitted provided that the following conditions are met:
saloutos 0:083111ae2a11 36 * 1. Redistributions of source code must retain the above copyright notice,
saloutos 0:083111ae2a11 37 * this list of conditions and the following disclaimer.
saloutos 0:083111ae2a11 38 * 2. Redistributions in binary form must reproduce the above copyright notice,
saloutos 0:083111ae2a11 39 * this list of conditions and the following disclaimer in the documentation
saloutos 0:083111ae2a11 40 * and/or other materials provided with the distribution.
saloutos 0:083111ae2a11 41 * 3. Neither the name of STMicroelectronics nor the names of its contributors
saloutos 0:083111ae2a11 42 * may be used to endorse or promote products derived from this software
saloutos 0:083111ae2a11 43 * without specific prior written permission.
saloutos 0:083111ae2a11 44 *
saloutos 0:083111ae2a11 45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
saloutos 0:083111ae2a11 46 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
saloutos 0:083111ae2a11 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
saloutos 0:083111ae2a11 48 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
saloutos 0:083111ae2a11 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
saloutos 0:083111ae2a11 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
saloutos 0:083111ae2a11 51 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
saloutos 0:083111ae2a11 52 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
saloutos 0:083111ae2a11 53 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
saloutos 0:083111ae2a11 54 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
saloutos 0:083111ae2a11 55 *
saloutos 0:083111ae2a11 56 ******************************************************************************
saloutos 0:083111ae2a11 57 */
saloutos 0:083111ae2a11 58
saloutos 0:083111ae2a11 59 /* Includes ------------------------------------------------------------------*/
saloutos 0:083111ae2a11 60 #include "stm32f7xx_hal.h"
saloutos 0:083111ae2a11 61
saloutos 0:083111ae2a11 62 /** @addtogroup STM32F7xx_HAL_Driver
saloutos 0:083111ae2a11 63 * @{
saloutos 0:083111ae2a11 64 */
saloutos 0:083111ae2a11 65
saloutos 0:083111ae2a11 66 /** @addtogroup RNG
saloutos 0:083111ae2a11 67 * @{
saloutos 0:083111ae2a11 68 */
saloutos 0:083111ae2a11 69
saloutos 0:083111ae2a11 70 #ifdef HAL_RNG_MODULE_ENABLED
saloutos 0:083111ae2a11 71
saloutos 0:083111ae2a11 72 /* Private types -------------------------------------------------------------*/
saloutos 0:083111ae2a11 73 /* Private defines -----------------------------------------------------------*/
saloutos 0:083111ae2a11 74 /* Private variables ---------------------------------------------------------*/
saloutos 0:083111ae2a11 75 /* Private constants ---------------------------------------------------------*/
saloutos 0:083111ae2a11 76 /** @addtogroup RNG_Private_Constants
saloutos 0:083111ae2a11 77 * @{
saloutos 0:083111ae2a11 78 */
saloutos 0:083111ae2a11 79 #define RNG_TIMEOUT_VALUE 2
saloutos 0:083111ae2a11 80 /**
saloutos 0:083111ae2a11 81 * @}
saloutos 0:083111ae2a11 82 */
saloutos 0:083111ae2a11 83 /* Private macros ------------------------------------------------------------*/
saloutos 0:083111ae2a11 84 /* Private functions prototypes ----------------------------------------------*/
saloutos 0:083111ae2a11 85 /* Private functions ---------------------------------------------------------*/
saloutos 0:083111ae2a11 86 /* Exported functions --------------------------------------------------------*/
saloutos 0:083111ae2a11 87
saloutos 0:083111ae2a11 88 /** @addtogroup RNG_Exported_Functions
saloutos 0:083111ae2a11 89 * @{
saloutos 0:083111ae2a11 90 */
saloutos 0:083111ae2a11 91
saloutos 0:083111ae2a11 92 /** @addtogroup RNG_Exported_Functions_Group1
saloutos 0:083111ae2a11 93 * @brief Initialization and de-initialization functions
saloutos 0:083111ae2a11 94 *
saloutos 0:083111ae2a11 95 @verbatim
saloutos 0:083111ae2a11 96 ===============================================================================
saloutos 0:083111ae2a11 97 ##### Initialization and de-initialization functions #####
saloutos 0:083111ae2a11 98 ===============================================================================
saloutos 0:083111ae2a11 99 [..] This section provides functions allowing to:
saloutos 0:083111ae2a11 100 (+) Initialize the RNG according to the specified parameters
saloutos 0:083111ae2a11 101 in the RNG_InitTypeDef and create the associated handle
saloutos 0:083111ae2a11 102 (+) DeInitialize the RNG peripheral
saloutos 0:083111ae2a11 103 (+) Initialize the RNG MSP
saloutos 0:083111ae2a11 104 (+) DeInitialize RNG MSP
saloutos 0:083111ae2a11 105
saloutos 0:083111ae2a11 106 @endverbatim
saloutos 0:083111ae2a11 107 * @{
saloutos 0:083111ae2a11 108 */
saloutos 0:083111ae2a11 109
saloutos 0:083111ae2a11 110 /**
saloutos 0:083111ae2a11 111 * @brief Initializes the RNG peripheral and creates the associated handle.
saloutos 0:083111ae2a11 112 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 113 * the configuration information for RNG.
saloutos 0:083111ae2a11 114 * @retval HAL status
saloutos 0:083111ae2a11 115 */
saloutos 0:083111ae2a11 116 HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 117 {
saloutos 0:083111ae2a11 118 /* Check the RNG handle allocation */
saloutos 0:083111ae2a11 119 if(hrng == NULL)
saloutos 0:083111ae2a11 120 {
saloutos 0:083111ae2a11 121 return HAL_ERROR;
saloutos 0:083111ae2a11 122 }
saloutos 0:083111ae2a11 123
saloutos 0:083111ae2a11 124 __HAL_LOCK(hrng);
saloutos 0:083111ae2a11 125
saloutos 0:083111ae2a11 126 if(hrng->State == HAL_RNG_STATE_RESET)
saloutos 0:083111ae2a11 127 {
saloutos 0:083111ae2a11 128 /* Allocate lock resource and initialize it */
saloutos 0:083111ae2a11 129 hrng->Lock = HAL_UNLOCKED;
saloutos 0:083111ae2a11 130
saloutos 0:083111ae2a11 131 /* Init the low level hardware */
saloutos 0:083111ae2a11 132 HAL_RNG_MspInit(hrng);
saloutos 0:083111ae2a11 133 }
saloutos 0:083111ae2a11 134
saloutos 0:083111ae2a11 135 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 136 hrng->State = HAL_RNG_STATE_BUSY;
saloutos 0:083111ae2a11 137
saloutos 0:083111ae2a11 138 /* Enable the RNG Peripheral */
saloutos 0:083111ae2a11 139 __HAL_RNG_ENABLE(hrng);
saloutos 0:083111ae2a11 140
saloutos 0:083111ae2a11 141 /* Initialize the RNG state */
saloutos 0:083111ae2a11 142 hrng->State = HAL_RNG_STATE_READY;
saloutos 0:083111ae2a11 143
saloutos 0:083111ae2a11 144 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 145
saloutos 0:083111ae2a11 146 /* Return function status */
saloutos 0:083111ae2a11 147 return HAL_OK;
saloutos 0:083111ae2a11 148 }
saloutos 0:083111ae2a11 149
saloutos 0:083111ae2a11 150 /**
saloutos 0:083111ae2a11 151 * @brief DeInitializes the RNG peripheral.
saloutos 0:083111ae2a11 152 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 153 * the configuration information for RNG.
saloutos 0:083111ae2a11 154 * @retval HAL status
saloutos 0:083111ae2a11 155 */
saloutos 0:083111ae2a11 156 HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 157 {
saloutos 0:083111ae2a11 158 /* Check the RNG handle allocation */
saloutos 0:083111ae2a11 159 if(hrng == NULL)
saloutos 0:083111ae2a11 160 {
saloutos 0:083111ae2a11 161 return HAL_ERROR;
saloutos 0:083111ae2a11 162 }
saloutos 0:083111ae2a11 163 /* Disable the RNG Peripheral */
saloutos 0:083111ae2a11 164 CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN);
saloutos 0:083111ae2a11 165
saloutos 0:083111ae2a11 166 /* Clear RNG interrupt status flags */
saloutos 0:083111ae2a11 167 CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS);
saloutos 0:083111ae2a11 168
saloutos 0:083111ae2a11 169 /* DeInit the low level hardware */
saloutos 0:083111ae2a11 170 HAL_RNG_MspDeInit(hrng);
saloutos 0:083111ae2a11 171
saloutos 0:083111ae2a11 172 /* Update the RNG state */
saloutos 0:083111ae2a11 173 hrng->State = HAL_RNG_STATE_RESET;
saloutos 0:083111ae2a11 174
saloutos 0:083111ae2a11 175 /* Release Lock */
saloutos 0:083111ae2a11 176 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 177
saloutos 0:083111ae2a11 178 /* Return the function status */
saloutos 0:083111ae2a11 179 return HAL_OK;
saloutos 0:083111ae2a11 180 }
saloutos 0:083111ae2a11 181
saloutos 0:083111ae2a11 182 /**
saloutos 0:083111ae2a11 183 * @brief Initializes the RNG MSP.
saloutos 0:083111ae2a11 184 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 185 * the configuration information for RNG.
saloutos 0:083111ae2a11 186 * @retval None
saloutos 0:083111ae2a11 187 */
saloutos 0:083111ae2a11 188 __weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 189 {
saloutos 0:083111ae2a11 190 /* Prevent unused argument(s) compilation warning */
saloutos 0:083111ae2a11 191 UNUSED(hrng);
saloutos 0:083111ae2a11 192
saloutos 0:083111ae2a11 193 /* NOTE : This function should not be modified. When the callback is needed,
saloutos 0:083111ae2a11 194 function HAL_RNG_MspInit must be implemented in the user file.
saloutos 0:083111ae2a11 195 */
saloutos 0:083111ae2a11 196 }
saloutos 0:083111ae2a11 197
saloutos 0:083111ae2a11 198 /**
saloutos 0:083111ae2a11 199 * @brief DeInitializes the RNG MSP.
saloutos 0:083111ae2a11 200 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 201 * the configuration information for RNG.
saloutos 0:083111ae2a11 202 * @retval None
saloutos 0:083111ae2a11 203 */
saloutos 0:083111ae2a11 204 __weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 205 {
saloutos 0:083111ae2a11 206 /* Prevent unused argument(s) compilation warning */
saloutos 0:083111ae2a11 207 UNUSED(hrng);
saloutos 0:083111ae2a11 208
saloutos 0:083111ae2a11 209 /* NOTE : This function should not be modified. When the callback is needed,
saloutos 0:083111ae2a11 210 function HAL_RNG_MspDeInit must be implemented in the user file.
saloutos 0:083111ae2a11 211 */
saloutos 0:083111ae2a11 212 }
saloutos 0:083111ae2a11 213
saloutos 0:083111ae2a11 214 /**
saloutos 0:083111ae2a11 215 * @}
saloutos 0:083111ae2a11 216 */
saloutos 0:083111ae2a11 217
saloutos 0:083111ae2a11 218 /** @addtogroup RNG_Exported_Functions_Group2
saloutos 0:083111ae2a11 219 * @brief Peripheral Control functions
saloutos 0:083111ae2a11 220 *
saloutos 0:083111ae2a11 221 @verbatim
saloutos 0:083111ae2a11 222 ===============================================================================
saloutos 0:083111ae2a11 223 ##### Peripheral Control functions #####
saloutos 0:083111ae2a11 224 ===============================================================================
saloutos 0:083111ae2a11 225 [..] This section provides functions allowing to:
saloutos 0:083111ae2a11 226 (+) Get the 32 bit Random number
saloutos 0:083111ae2a11 227 (+) Get the 32 bit Random number with interrupt enabled
saloutos 0:083111ae2a11 228 (+) Handle RNG interrupt request
saloutos 0:083111ae2a11 229
saloutos 0:083111ae2a11 230 @endverbatim
saloutos 0:083111ae2a11 231 * @{
saloutos 0:083111ae2a11 232 */
saloutos 0:083111ae2a11 233
saloutos 0:083111ae2a11 234 /**
saloutos 0:083111ae2a11 235 * @brief Generates a 32-bit random number.
saloutos 0:083111ae2a11 236 * @note Each time the random number data is read the RNG_FLAG_DRDY flag
saloutos 0:083111ae2a11 237 * is automatically cleared.
saloutos 0:083111ae2a11 238 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 239 * the configuration information for RNG.
saloutos 0:083111ae2a11 240 * @param random32bit: pointer to generated random number variable if successful.
saloutos 0:083111ae2a11 241 * @retval HAL status
saloutos 0:083111ae2a11 242 */
saloutos 0:083111ae2a11 243
saloutos 0:083111ae2a11 244 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit)
saloutos 0:083111ae2a11 245 {
saloutos 0:083111ae2a11 246 uint32_t tickstart = 0;
saloutos 0:083111ae2a11 247 HAL_StatusTypeDef status = HAL_OK;
saloutos 0:083111ae2a11 248
saloutos 0:083111ae2a11 249 /* Process Locked */
saloutos 0:083111ae2a11 250 __HAL_LOCK(hrng);
saloutos 0:083111ae2a11 251
saloutos 0:083111ae2a11 252 /* Check RNG peripheral state */
saloutos 0:083111ae2a11 253 if(hrng->State == HAL_RNG_STATE_READY)
saloutos 0:083111ae2a11 254 {
saloutos 0:083111ae2a11 255 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 256 hrng->State = HAL_RNG_STATE_BUSY;
saloutos 0:083111ae2a11 257
saloutos 0:083111ae2a11 258 /* Get tick */
saloutos 0:083111ae2a11 259 tickstart = HAL_GetTick();
saloutos 0:083111ae2a11 260
saloutos 0:083111ae2a11 261 /* Check if data register contains valid random data */
saloutos 0:083111ae2a11 262 while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
saloutos 0:083111ae2a11 263 {
saloutos 0:083111ae2a11 264 if((HAL_GetTick() - tickstart ) > RNG_TIMEOUT_VALUE)
saloutos 0:083111ae2a11 265 {
saloutos 0:083111ae2a11 266 hrng->State = HAL_RNG_STATE_ERROR;
saloutos 0:083111ae2a11 267
saloutos 0:083111ae2a11 268 /* Process Unlocked */
saloutos 0:083111ae2a11 269 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 270
saloutos 0:083111ae2a11 271 return HAL_TIMEOUT;
saloutos 0:083111ae2a11 272 }
saloutos 0:083111ae2a11 273 }
saloutos 0:083111ae2a11 274
saloutos 0:083111ae2a11 275 /* Get a 32bit Random number */
saloutos 0:083111ae2a11 276 hrng->RandomNumber = hrng->Instance->DR;
saloutos 0:083111ae2a11 277 *random32bit = hrng->RandomNumber;
saloutos 0:083111ae2a11 278
saloutos 0:083111ae2a11 279 hrng->State = HAL_RNG_STATE_READY;
saloutos 0:083111ae2a11 280 }
saloutos 0:083111ae2a11 281 else
saloutos 0:083111ae2a11 282 {
saloutos 0:083111ae2a11 283 status = HAL_ERROR;
saloutos 0:083111ae2a11 284 }
saloutos 0:083111ae2a11 285
saloutos 0:083111ae2a11 286 /* Process Unlocked */
saloutos 0:083111ae2a11 287 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 288
saloutos 0:083111ae2a11 289 return status;
saloutos 0:083111ae2a11 290 }
saloutos 0:083111ae2a11 291
saloutos 0:083111ae2a11 292 /**
saloutos 0:083111ae2a11 293 * @brief Generates a 32-bit random number in interrupt mode.
saloutos 0:083111ae2a11 294 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 295 * the configuration information for RNG.
saloutos 0:083111ae2a11 296 * @retval HAL status
saloutos 0:083111ae2a11 297 */
saloutos 0:083111ae2a11 298 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 299 {
saloutos 0:083111ae2a11 300 HAL_StatusTypeDef status = HAL_OK;
saloutos 0:083111ae2a11 301
saloutos 0:083111ae2a11 302 /* Process Locked */
saloutos 0:083111ae2a11 303 __HAL_LOCK(hrng);
saloutos 0:083111ae2a11 304
saloutos 0:083111ae2a11 305 /* Check RNG peripheral state */
saloutos 0:083111ae2a11 306 if(hrng->State == HAL_RNG_STATE_READY)
saloutos 0:083111ae2a11 307 {
saloutos 0:083111ae2a11 308 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 309 hrng->State = HAL_RNG_STATE_BUSY;
saloutos 0:083111ae2a11 310
saloutos 0:083111ae2a11 311 /* Process Unlocked */
saloutos 0:083111ae2a11 312 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 313
saloutos 0:083111ae2a11 314 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
saloutos 0:083111ae2a11 315 __HAL_RNG_ENABLE_IT(hrng);
saloutos 0:083111ae2a11 316 }
saloutos 0:083111ae2a11 317 else
saloutos 0:083111ae2a11 318 {
saloutos 0:083111ae2a11 319 /* Process Unlocked */
saloutos 0:083111ae2a11 320 __HAL_UNLOCK(hrng);
saloutos 0:083111ae2a11 321
saloutos 0:083111ae2a11 322 status = HAL_ERROR;
saloutos 0:083111ae2a11 323 }
saloutos 0:083111ae2a11 324
saloutos 0:083111ae2a11 325 return status;
saloutos 0:083111ae2a11 326 }
saloutos 0:083111ae2a11 327
saloutos 0:083111ae2a11 328 /**
saloutos 0:083111ae2a11 329 * @brief Handles RNG interrupt request.
saloutos 0:083111ae2a11 330 * @note In the case of a clock error, the RNG is no more able to generate
saloutos 0:083111ae2a11 331 * random numbers because the PLL48CLK clock is not correct. User has
saloutos 0:083111ae2a11 332 * to check that the clock controller is correctly configured to provide
saloutos 0:083111ae2a11 333 * the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
saloutos 0:083111ae2a11 334 * The clock error has no impact on the previously generated
saloutos 0:083111ae2a11 335 * random numbers, and the RNG_DR register contents can be used.
saloutos 0:083111ae2a11 336 * @note In the case of a seed error, the generation of random numbers is
saloutos 0:083111ae2a11 337 * interrupted as long as the SECS bit is '1'. If a number is
saloutos 0:083111ae2a11 338 * available in the RNG_DR register, it must not be used because it may
saloutos 0:083111ae2a11 339 * not have enough entropy. In this case, it is recommended to clear the
saloutos 0:083111ae2a11 340 * SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
saloutos 0:083111ae2a11 341 * the RNG peripheral to reinitialize and restart the RNG.
saloutos 0:083111ae2a11 342 * @note User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
saloutos 0:083111ae2a11 343 * or CEIS are set.
saloutos 0:083111ae2a11 344 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 345 * the configuration information for RNG.
saloutos 0:083111ae2a11 346 * @retval None
saloutos 0:083111ae2a11 347
saloutos 0:083111ae2a11 348 */
saloutos 0:083111ae2a11 349 void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 350 {
saloutos 0:083111ae2a11 351 /* RNG clock error interrupt occurred */
saloutos 0:083111ae2a11 352 if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET))
saloutos 0:083111ae2a11 353 {
saloutos 0:083111ae2a11 354 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 355 hrng->State = HAL_RNG_STATE_ERROR;
saloutos 0:083111ae2a11 356
saloutos 0:083111ae2a11 357 HAL_RNG_ErrorCallback(hrng);
saloutos 0:083111ae2a11 358
saloutos 0:083111ae2a11 359 /* Clear the clock error flag */
saloutos 0:083111ae2a11 360 __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI);
saloutos 0:083111ae2a11 361
saloutos 0:083111ae2a11 362 }
saloutos 0:083111ae2a11 363
saloutos 0:083111ae2a11 364 /* Check RNG data ready interrupt occurred */
saloutos 0:083111ae2a11 365 if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
saloutos 0:083111ae2a11 366 {
saloutos 0:083111ae2a11 367 /* Generate random number once, so disable the IT */
saloutos 0:083111ae2a11 368 __HAL_RNG_DISABLE_IT(hrng);
saloutos 0:083111ae2a11 369
saloutos 0:083111ae2a11 370 /* Get the 32bit Random number (DRDY flag automatically cleared) */
saloutos 0:083111ae2a11 371 hrng->RandomNumber = hrng->Instance->DR;
saloutos 0:083111ae2a11 372
saloutos 0:083111ae2a11 373 if(hrng->State != HAL_RNG_STATE_ERROR)
saloutos 0:083111ae2a11 374 {
saloutos 0:083111ae2a11 375 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 376 hrng->State = HAL_RNG_STATE_READY;
saloutos 0:083111ae2a11 377
saloutos 0:083111ae2a11 378 /* Data Ready callback */
saloutos 0:083111ae2a11 379 HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
saloutos 0:083111ae2a11 380 }
saloutos 0:083111ae2a11 381 }
saloutos 0:083111ae2a11 382 }
saloutos 0:083111ae2a11 383
saloutos 0:083111ae2a11 384 /**
saloutos 0:083111ae2a11 385 * @brief Returns generated random number in polling mode (Obsolete)
saloutos 0:083111ae2a11 386 * Use HAL_RNG_GenerateRandomNumber() API instead.
saloutos 0:083111ae2a11 387 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 388 * the configuration information for RNG.
saloutos 0:083111ae2a11 389 * @retval Random value
saloutos 0:083111ae2a11 390 */
saloutos 0:083111ae2a11 391 uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 392 {
saloutos 0:083111ae2a11 393 if(HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK)
saloutos 0:083111ae2a11 394 {
saloutos 0:083111ae2a11 395 return hrng->RandomNumber;
saloutos 0:083111ae2a11 396 }
saloutos 0:083111ae2a11 397 else
saloutos 0:083111ae2a11 398 {
saloutos 0:083111ae2a11 399 return 0;
saloutos 0:083111ae2a11 400 }
saloutos 0:083111ae2a11 401 }
saloutos 0:083111ae2a11 402
saloutos 0:083111ae2a11 403 /**
saloutos 0:083111ae2a11 404 * @brief Returns a 32-bit random number with interrupt enabled (Obsolete),
saloutos 0:083111ae2a11 405 * Use HAL_RNG_GenerateRandomNumber_IT() API instead.
saloutos 0:083111ae2a11 406 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 407 * the configuration information for RNG.
saloutos 0:083111ae2a11 408 * @retval 32-bit random number
saloutos 0:083111ae2a11 409 */
saloutos 0:083111ae2a11 410 uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 411 {
saloutos 0:083111ae2a11 412 uint32_t random32bit = 0;
saloutos 0:083111ae2a11 413
saloutos 0:083111ae2a11 414 /* Process locked */
saloutos 0:083111ae2a11 415 __HAL_LOCK(hrng);
saloutos 0:083111ae2a11 416
saloutos 0:083111ae2a11 417 /* Change RNG peripheral state */
saloutos 0:083111ae2a11 418 hrng->State = HAL_RNG_STATE_BUSY;
saloutos 0:083111ae2a11 419
saloutos 0:083111ae2a11 420 /* Get a 32bit Random number */
saloutos 0:083111ae2a11 421 random32bit = hrng->Instance->DR;
saloutos 0:083111ae2a11 422
saloutos 0:083111ae2a11 423 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
saloutos 0:083111ae2a11 424 __HAL_RNG_ENABLE_IT(hrng);
saloutos 0:083111ae2a11 425
saloutos 0:083111ae2a11 426 /* Return the 32 bit random number */
saloutos 0:083111ae2a11 427 return random32bit;
saloutos 0:083111ae2a11 428 }
saloutos 0:083111ae2a11 429
saloutos 0:083111ae2a11 430 /**
saloutos 0:083111ae2a11 431 * @brief Read latest generated random number.
saloutos 0:083111ae2a11 432 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 433 * the configuration information for RNG.
saloutos 0:083111ae2a11 434 * @retval random value
saloutos 0:083111ae2a11 435 */
saloutos 0:083111ae2a11 436 uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 437 {
saloutos 0:083111ae2a11 438 return(hrng->RandomNumber);
saloutos 0:083111ae2a11 439 }
saloutos 0:083111ae2a11 440
saloutos 0:083111ae2a11 441 /**
saloutos 0:083111ae2a11 442 * @brief Data Ready callback in non-blocking mode.
saloutos 0:083111ae2a11 443 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 444 * the configuration information for RNG.
saloutos 0:083111ae2a11 445 * @param random32bit: generated random number.
saloutos 0:083111ae2a11 446 * @retval None
saloutos 0:083111ae2a11 447 */
saloutos 0:083111ae2a11 448 __weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit)
saloutos 0:083111ae2a11 449 {
saloutos 0:083111ae2a11 450 /* Prevent unused argument(s) compilation warning */
saloutos 0:083111ae2a11 451 UNUSED(hrng);
saloutos 0:083111ae2a11 452
saloutos 0:083111ae2a11 453 /* NOTE : This function should not be modified. When the callback is needed,
saloutos 0:083111ae2a11 454 function HAL_RNG_ReadyDataCallback must be implemented in the user file.
saloutos 0:083111ae2a11 455 */
saloutos 0:083111ae2a11 456 }
saloutos 0:083111ae2a11 457
saloutos 0:083111ae2a11 458 /**
saloutos 0:083111ae2a11 459 * @brief RNG error callbacks.
saloutos 0:083111ae2a11 460 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 461 * the configuration information for RNG.
saloutos 0:083111ae2a11 462 * @retval None
saloutos 0:083111ae2a11 463 */
saloutos 0:083111ae2a11 464 __weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 465 {
saloutos 0:083111ae2a11 466 /* Prevent unused argument(s) compilation warning */
saloutos 0:083111ae2a11 467 UNUSED(hrng);
saloutos 0:083111ae2a11 468
saloutos 0:083111ae2a11 469 /* NOTE : This function should not be modified. When the callback is needed,
saloutos 0:083111ae2a11 470 function HAL_RNG_ErrorCallback must be implemented in the user file.
saloutos 0:083111ae2a11 471 */
saloutos 0:083111ae2a11 472 }
saloutos 0:083111ae2a11 473 /**
saloutos 0:083111ae2a11 474 * @}
saloutos 0:083111ae2a11 475 */
saloutos 0:083111ae2a11 476
saloutos 0:083111ae2a11 477
saloutos 0:083111ae2a11 478 /** @addtogroup RNG_Exported_Functions_Group3
saloutos 0:083111ae2a11 479 * @brief Peripheral State functions
saloutos 0:083111ae2a11 480 *
saloutos 0:083111ae2a11 481 @verbatim
saloutos 0:083111ae2a11 482 ===============================================================================
saloutos 0:083111ae2a11 483 ##### Peripheral State functions #####
saloutos 0:083111ae2a11 484 ===============================================================================
saloutos 0:083111ae2a11 485 [..]
saloutos 0:083111ae2a11 486 This subsection permits to get in run-time the status of the peripheral
saloutos 0:083111ae2a11 487 and the data flow.
saloutos 0:083111ae2a11 488
saloutos 0:083111ae2a11 489 @endverbatim
saloutos 0:083111ae2a11 490 * @{
saloutos 0:083111ae2a11 491 */
saloutos 0:083111ae2a11 492
saloutos 0:083111ae2a11 493 /**
saloutos 0:083111ae2a11 494 * @brief Returns the RNG state.
saloutos 0:083111ae2a11 495 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
saloutos 0:083111ae2a11 496 * the configuration information for RNG.
saloutos 0:083111ae2a11 497 * @retval HAL state
saloutos 0:083111ae2a11 498 */
saloutos 0:083111ae2a11 499 HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
saloutos 0:083111ae2a11 500 {
saloutos 0:083111ae2a11 501 return hrng->State;
saloutos 0:083111ae2a11 502 }
saloutos 0:083111ae2a11 503
saloutos 0:083111ae2a11 504 /**
saloutos 0:083111ae2a11 505 * @}
saloutos 0:083111ae2a11 506 */
saloutos 0:083111ae2a11 507
saloutos 0:083111ae2a11 508 /**
saloutos 0:083111ae2a11 509 * @}
saloutos 0:083111ae2a11 510 */
saloutos 0:083111ae2a11 511
saloutos 0:083111ae2a11 512 #endif /* HAL_RNG_MODULE_ENABLED */
saloutos 0:083111ae2a11 513
saloutos 0:083111ae2a11 514 /**
saloutos 0:083111ae2a11 515 * @}
saloutos 0:083111ae2a11 516 */
saloutos 0:083111ae2a11 517
saloutos 0:083111ae2a11 518 /**
saloutos 0:083111ae2a11 519 * @}
saloutos 0:083111ae2a11 520 */
saloutos 0:083111ae2a11 521
saloutos 0:083111ae2a11 522 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/