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HAL_L476/stm32l4xx_hal_rng.c@1:d0dfbce63a89, 2017-02-24 (annotated)

Committer:
elmot
Date:
Fri Feb 24 21:13:56 2017 +0000
Revision:
1:d0dfbce63a89
Ready-to-copy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmot 1:d0dfbce63a89 1 /**
elmot 1:d0dfbce63a89 2 ******************************************************************************
elmot 1:d0dfbce63a89 3 * @file stm32l4xx_hal_rng.c
elmot 1:d0dfbce63a89 4 * @author MCD Application Team
elmot 1:d0dfbce63a89 5 * @version V1.5.1
elmot 1:d0dfbce63a89 6 * @date 31-May-2016
elmot 1:d0dfbce63a89 7 * @brief RNG HAL module driver.
elmot 1:d0dfbce63a89 8 * This file provides firmware functions to manage the following
elmot 1:d0dfbce63a89 9 * functionalities of the Random Number Generator (RNG) peripheral:
elmot 1:d0dfbce63a89 10 * + Initialization/de-initialization functions
elmot 1:d0dfbce63a89 11 * + Peripheral Control functions
elmot 1:d0dfbce63a89 12 * + Peripheral State functions
elmot 1:d0dfbce63a89 13 *
elmot 1:d0dfbce63a89 14 @verbatim
elmot 1:d0dfbce63a89 15 ==============================================================================
elmot 1:d0dfbce63a89 16 ##### How to use this driver #####
elmot 1:d0dfbce63a89 17 ==============================================================================
elmot 1:d0dfbce63a89 18 [..]
elmot 1:d0dfbce63a89 19 The RNG HAL driver can be used as follows:
elmot 1:d0dfbce63a89 20
elmot 1:d0dfbce63a89 21 (#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro
elmot 1:d0dfbce63a89 22 in HAL_RNG_MspInit().
elmot 1:d0dfbce63a89 23 (#) Activate the RNG peripheral using HAL_RNG_Init() function.
elmot 1:d0dfbce63a89 24 (#) Wait until the 32-bit Random Number Generator contains a valid
elmot 1:d0dfbce63a89 25 random data using (polling/interrupt) mode.
elmot 1:d0dfbce63a89 26 (#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function.
elmot 1:d0dfbce63a89 27
elmot 1:d0dfbce63a89 28 @endverbatim
elmot 1:d0dfbce63a89 29 ******************************************************************************
elmot 1:d0dfbce63a89 30 * @attention
elmot 1:d0dfbce63a89 31 *
elmot 1:d0dfbce63a89 32 * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
elmot 1:d0dfbce63a89 33 *
elmot 1:d0dfbce63a89 34 * Redistribution and use in source and binary forms, with or without modification,
elmot 1:d0dfbce63a89 35 * are permitted provided that the following conditions are met:
elmot 1:d0dfbce63a89 36 * 1. Redistributions of source code must retain the above copyright notice,
elmot 1:d0dfbce63a89 37 * this list of conditions and the following disclaimer.
elmot 1:d0dfbce63a89 38 * 2. Redistributions in binary form must reproduce the above copyright notice,
elmot 1:d0dfbce63a89 39 * this list of conditions and the following disclaimer in the documentation
elmot 1:d0dfbce63a89 40 * and/or other materials provided with the distribution.
elmot 1:d0dfbce63a89 41 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elmot 1:d0dfbce63a89 42 * may be used to endorse or promote products derived from this software
elmot 1:d0dfbce63a89 43 * without specific prior written permission.
elmot 1:d0dfbce63a89 44 *
elmot 1:d0dfbce63a89 45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elmot 1:d0dfbce63a89 46 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elmot 1:d0dfbce63a89 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elmot 1:d0dfbce63a89 48 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elmot 1:d0dfbce63a89 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elmot 1:d0dfbce63a89 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elmot 1:d0dfbce63a89 51 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elmot 1:d0dfbce63a89 52 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elmot 1:d0dfbce63a89 53 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elmot 1:d0dfbce63a89 54 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elmot 1:d0dfbce63a89 55 *
elmot 1:d0dfbce63a89 56 ******************************************************************************
elmot 1:d0dfbce63a89 57 */
elmot 1:d0dfbce63a89 58
elmot 1:d0dfbce63a89 59 /* Includes ------------------------------------------------------------------*/
elmot 1:d0dfbce63a89 60 #include "stm32l4xx_hal.h"
elmot 1:d0dfbce63a89 61
elmot 1:d0dfbce63a89 62 /** @addtogroup STM32L4xx_HAL_Driver
elmot 1:d0dfbce63a89 63 * @{
elmot 1:d0dfbce63a89 64 */
elmot 1:d0dfbce63a89 65
elmot 1:d0dfbce63a89 66 /** @defgroup RNG RNG
elmot 1:d0dfbce63a89 67 * @brief RNG HAL module driver.
elmot 1:d0dfbce63a89 68 * @{
elmot 1:d0dfbce63a89 69 */
elmot 1:d0dfbce63a89 70
elmot 1:d0dfbce63a89 71 #ifdef HAL_RNG_MODULE_ENABLED
elmot 1:d0dfbce63a89 72
elmot 1:d0dfbce63a89 73
elmot 1:d0dfbce63a89 74
elmot 1:d0dfbce63a89 75 /* Private types -------------------------------------------------------------*/
elmot 1:d0dfbce63a89 76 /* Private defines -----------------------------------------------------------*/
elmot 1:d0dfbce63a89 77 /** @defgroup RNG_Private_Constants RNG_Private_Constants
elmot 1:d0dfbce63a89 78 * @{
elmot 1:d0dfbce63a89 79 */
elmot 1:d0dfbce63a89 80 #define RNG_TIMEOUT_VALUE 2
elmot 1:d0dfbce63a89 81 /**
elmot 1:d0dfbce63a89 82 * @}
elmot 1:d0dfbce63a89 83 */
elmot 1:d0dfbce63a89 84
elmot 1:d0dfbce63a89 85 /* Private macros ------------------------------------------------------------*/
elmot 1:d0dfbce63a89 86 /* Private variables ---------------------------------------------------------*/
elmot 1:d0dfbce63a89 87 /* Private function prototypes -----------------------------------------------*/
elmot 1:d0dfbce63a89 88 /* Private functions ---------------------------------------------------------*/
elmot 1:d0dfbce63a89 89 /* Exported functions --------------------------------------------------------*/
elmot 1:d0dfbce63a89 90
elmot 1:d0dfbce63a89 91 /** @addtogroup RNG_Exported_Functions
elmot 1:d0dfbce63a89 92 * @{
elmot 1:d0dfbce63a89 93 */
elmot 1:d0dfbce63a89 94
elmot 1:d0dfbce63a89 95 /** @addtogroup RNG_Exported_Functions_Group1
elmot 1:d0dfbce63a89 96 * @brief Initialization and de-initialization functions
elmot 1:d0dfbce63a89 97 *
elmot 1:d0dfbce63a89 98 @verbatim
elmot 1:d0dfbce63a89 99 ===============================================================================
elmot 1:d0dfbce63a89 100 ##### Initialization and de-initialization functions #####
elmot 1:d0dfbce63a89 101 ===============================================================================
elmot 1:d0dfbce63a89 102 [..] This section provides functions allowing to:
elmot 1:d0dfbce63a89 103 (+) Initialize the RNG according to the specified parameters
elmot 1:d0dfbce63a89 104 in the RNG_InitTypeDef and create the associated handle
elmot 1:d0dfbce63a89 105 (+) DeInitialize the RNG peripheral
elmot 1:d0dfbce63a89 106 (+) Initialize the RNG MSP (MCU Specific Package)
elmot 1:d0dfbce63a89 107 (+) DeInitialize the RNG MSP
elmot 1:d0dfbce63a89 108
elmot 1:d0dfbce63a89 109 @endverbatim
elmot 1:d0dfbce63a89 110 * @{
elmot 1:d0dfbce63a89 111 */
elmot 1:d0dfbce63a89 112
elmot 1:d0dfbce63a89 113 /**
elmot 1:d0dfbce63a89 114 * @brief Initialize the RNG peripheral and initialize the associated handle.
elmot 1:d0dfbce63a89 115 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 116 * @retval HAL status
elmot 1:d0dfbce63a89 117 */
elmot 1:d0dfbce63a89 118 HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 119 {
elmot 1:d0dfbce63a89 120 /* Check the RNG handle allocation */
elmot 1:d0dfbce63a89 121 if(hrng == NULL)
elmot 1:d0dfbce63a89 122 {
elmot 1:d0dfbce63a89 123 return HAL_ERROR;
elmot 1:d0dfbce63a89 124 }
elmot 1:d0dfbce63a89 125
elmot 1:d0dfbce63a89 126 assert_param(IS_RNG_ALL_INSTANCE(hrng->Instance));
elmot 1:d0dfbce63a89 127
elmot 1:d0dfbce63a89 128 __HAL_LOCK(hrng);
elmot 1:d0dfbce63a89 129
elmot 1:d0dfbce63a89 130 if(hrng->State == HAL_RNG_STATE_RESET)
elmot 1:d0dfbce63a89 131 {
elmot 1:d0dfbce63a89 132 /* Allocate lock resource and initialize it */
elmot 1:d0dfbce63a89 133 hrng->Lock = HAL_UNLOCKED;
elmot 1:d0dfbce63a89 134
elmot 1:d0dfbce63a89 135 /* Init the low level hardware */
elmot 1:d0dfbce63a89 136 HAL_RNG_MspInit(hrng);
elmot 1:d0dfbce63a89 137 }
elmot 1:d0dfbce63a89 138
elmot 1:d0dfbce63a89 139 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 140 hrng->State = HAL_RNG_STATE_BUSY;
elmot 1:d0dfbce63a89 141
elmot 1:d0dfbce63a89 142 /* Enable the RNG Peripheral */
elmot 1:d0dfbce63a89 143 __HAL_RNG_ENABLE(hrng);
elmot 1:d0dfbce63a89 144
elmot 1:d0dfbce63a89 145 /* Initialize the RNG state */
elmot 1:d0dfbce63a89 146 hrng->State = HAL_RNG_STATE_READY;
elmot 1:d0dfbce63a89 147
elmot 1:d0dfbce63a89 148 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 149
elmot 1:d0dfbce63a89 150 /* Return function status */
elmot 1:d0dfbce63a89 151 return HAL_OK;
elmot 1:d0dfbce63a89 152 }
elmot 1:d0dfbce63a89 153
elmot 1:d0dfbce63a89 154 /**
elmot 1:d0dfbce63a89 155 * @brief DeInitialize the RNG peripheral.
elmot 1:d0dfbce63a89 156 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 157 * @retval HAL status
elmot 1:d0dfbce63a89 158 */
elmot 1:d0dfbce63a89 159 HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 160 {
elmot 1:d0dfbce63a89 161 /* Check the RNG handle allocation */
elmot 1:d0dfbce63a89 162 if(hrng == NULL)
elmot 1:d0dfbce63a89 163 {
elmot 1:d0dfbce63a89 164 return HAL_ERROR;
elmot 1:d0dfbce63a89 165 }
elmot 1:d0dfbce63a89 166 /* Disable the RNG Peripheral */
elmot 1:d0dfbce63a89 167 CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN);
elmot 1:d0dfbce63a89 168
elmot 1:d0dfbce63a89 169 /* Clear RNG interrupt status flags */
elmot 1:d0dfbce63a89 170 CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS);
elmot 1:d0dfbce63a89 171
elmot 1:d0dfbce63a89 172 /* DeInit the low level hardware */
elmot 1:d0dfbce63a89 173 HAL_RNG_MspDeInit(hrng);
elmot 1:d0dfbce63a89 174
elmot 1:d0dfbce63a89 175 /* Update the RNG state */
elmot 1:d0dfbce63a89 176 hrng->State = HAL_RNG_STATE_RESET;
elmot 1:d0dfbce63a89 177
elmot 1:d0dfbce63a89 178 /* Release Lock */
elmot 1:d0dfbce63a89 179 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 180
elmot 1:d0dfbce63a89 181 /* Return the function status */
elmot 1:d0dfbce63a89 182 return HAL_OK;
elmot 1:d0dfbce63a89 183 }
elmot 1:d0dfbce63a89 184
elmot 1:d0dfbce63a89 185 /**
elmot 1:d0dfbce63a89 186 * @brief Initialize the RNG MSP.
elmot 1:d0dfbce63a89 187 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 188 * @retval None
elmot 1:d0dfbce63a89 189 */
elmot 1:d0dfbce63a89 190 __weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 191 {
elmot 1:d0dfbce63a89 192 /* Prevent unused argument(s) compilation warning */
elmot 1:d0dfbce63a89 193 UNUSED(hrng);
elmot 1:d0dfbce63a89 194
elmot 1:d0dfbce63a89 195 /* NOTE : This function should not be modified. When the callback is needed,
elmot 1:d0dfbce63a89 196 function HAL_RNG_MspInit must be implemented in the user file.
elmot 1:d0dfbce63a89 197 */
elmot 1:d0dfbce63a89 198 }
elmot 1:d0dfbce63a89 199
elmot 1:d0dfbce63a89 200 /**
elmot 1:d0dfbce63a89 201 * @brief DeInitialize the RNG MSP.
elmot 1:d0dfbce63a89 202 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 203 * @retval None
elmot 1:d0dfbce63a89 204 */
elmot 1:d0dfbce63a89 205 __weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 206 {
elmot 1:d0dfbce63a89 207 /* Prevent unused argument(s) compilation warning */
elmot 1:d0dfbce63a89 208 UNUSED(hrng);
elmot 1:d0dfbce63a89 209
elmot 1:d0dfbce63a89 210 /* NOTE : This function should not be modified. When the callback is needed,
elmot 1:d0dfbce63a89 211 function HAL_RNG_MspDeInit must be implemented in the user file.
elmot 1:d0dfbce63a89 212 */
elmot 1:d0dfbce63a89 213 }
elmot 1:d0dfbce63a89 214
elmot 1:d0dfbce63a89 215 /**
elmot 1:d0dfbce63a89 216 * @}
elmot 1:d0dfbce63a89 217 */
elmot 1:d0dfbce63a89 218
elmot 1:d0dfbce63a89 219 /** @addtogroup RNG_Exported_Functions_Group2
elmot 1:d0dfbce63a89 220 * @brief Management functions.
elmot 1:d0dfbce63a89 221 *
elmot 1:d0dfbce63a89 222 @verbatim
elmot 1:d0dfbce63a89 223 ===============================================================================
elmot 1:d0dfbce63a89 224 ##### Peripheral Control functions #####
elmot 1:d0dfbce63a89 225 ===============================================================================
elmot 1:d0dfbce63a89 226 [..] This section provides functions allowing to:
elmot 1:d0dfbce63a89 227 (+) Get the 32 bit Random number
elmot 1:d0dfbce63a89 228 (+) Get the 32 bit Random number with interrupt enabled
elmot 1:d0dfbce63a89 229 (+) Handle RNG interrupt request
elmot 1:d0dfbce63a89 230
elmot 1:d0dfbce63a89 231 @endverbatim
elmot 1:d0dfbce63a89 232 * @{
elmot 1:d0dfbce63a89 233 */
elmot 1:d0dfbce63a89 234
elmot 1:d0dfbce63a89 235 /**
elmot 1:d0dfbce63a89 236 * @brief Generate a 32-bit random number.
elmot 1:d0dfbce63a89 237 * @note Each time the random number data is read the RNG_FLAG_DRDY flag
elmot 1:d0dfbce63a89 238 * is automatically cleared.
elmot 1:d0dfbce63a89 239 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 240 * @param random32bit: pointer to generated random number variable if successful.
elmot 1:d0dfbce63a89 241 * @retval HAL status
elmot 1:d0dfbce63a89 242 */
elmot 1:d0dfbce63a89 243
elmot 1:d0dfbce63a89 244 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit)
elmot 1:d0dfbce63a89 245 {
elmot 1:d0dfbce63a89 246 uint32_t tickstart = 0;
elmot 1:d0dfbce63a89 247 HAL_StatusTypeDef status = HAL_OK;
elmot 1:d0dfbce63a89 248
elmot 1:d0dfbce63a89 249 /* Process Locked */
elmot 1:d0dfbce63a89 250 __HAL_LOCK(hrng);
elmot 1:d0dfbce63a89 251
elmot 1:d0dfbce63a89 252 /* Check RNS peripheral state */
elmot 1:d0dfbce63a89 253 if(hrng->State == HAL_RNG_STATE_READY)
elmot 1:d0dfbce63a89 254 {
elmot 1:d0dfbce63a89 255 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 256 hrng->State = HAL_RNG_STATE_BUSY;
elmot 1:d0dfbce63a89 257
elmot 1:d0dfbce63a89 258 /* Get tick */
elmot 1:d0dfbce63a89 259 tickstart = HAL_GetTick();
elmot 1:d0dfbce63a89 260
elmot 1:d0dfbce63a89 261 /* Check if data register contains valid random data */
elmot 1:d0dfbce63a89 262 while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET)
elmot 1:d0dfbce63a89 263 {
elmot 1:d0dfbce63a89 264 if((HAL_GetTick() - tickstart ) > RNG_TIMEOUT_VALUE)
elmot 1:d0dfbce63a89 265 {
elmot 1:d0dfbce63a89 266 hrng->State = HAL_RNG_STATE_ERROR;
elmot 1:d0dfbce63a89 267
elmot 1:d0dfbce63a89 268 /* Process Unlocked */
elmot 1:d0dfbce63a89 269 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 270
elmot 1:d0dfbce63a89 271 return HAL_TIMEOUT;
elmot 1:d0dfbce63a89 272 }
elmot 1:d0dfbce63a89 273 }
elmot 1:d0dfbce63a89 274
elmot 1:d0dfbce63a89 275 /* Get a 32bit Random number */
elmot 1:d0dfbce63a89 276 hrng->RandomNumber = hrng->Instance->DR;
elmot 1:d0dfbce63a89 277 *random32bit = hrng->RandomNumber;
elmot 1:d0dfbce63a89 278
elmot 1:d0dfbce63a89 279 hrng->State = HAL_RNG_STATE_READY;
elmot 1:d0dfbce63a89 280 }
elmot 1:d0dfbce63a89 281 else
elmot 1:d0dfbce63a89 282 {
elmot 1:d0dfbce63a89 283 status = HAL_ERROR;
elmot 1:d0dfbce63a89 284 }
elmot 1:d0dfbce63a89 285
elmot 1:d0dfbce63a89 286 /* Process Unlocked */
elmot 1:d0dfbce63a89 287 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 288
elmot 1:d0dfbce63a89 289 return status;
elmot 1:d0dfbce63a89 290 }
elmot 1:d0dfbce63a89 291
elmot 1:d0dfbce63a89 292 /**
elmot 1:d0dfbce63a89 293 * @brief Generate a 32-bit random number in interrupt mode.
elmot 1:d0dfbce63a89 294 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 295 * @retval HAL status
elmot 1:d0dfbce63a89 296 */
elmot 1:d0dfbce63a89 297 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 298 {
elmot 1:d0dfbce63a89 299 HAL_StatusTypeDef status = HAL_OK;
elmot 1:d0dfbce63a89 300
elmot 1:d0dfbce63a89 301 /* Process Locked */
elmot 1:d0dfbce63a89 302 __HAL_LOCK(hrng);
elmot 1:d0dfbce63a89 303
elmot 1:d0dfbce63a89 304 /* Check RNG peripheral state */
elmot 1:d0dfbce63a89 305 if(hrng->State == HAL_RNG_STATE_READY)
elmot 1:d0dfbce63a89 306 {
elmot 1:d0dfbce63a89 307 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 308 hrng->State = HAL_RNG_STATE_BUSY;
elmot 1:d0dfbce63a89 309
elmot 1:d0dfbce63a89 310 /* Process Unlocked */
elmot 1:d0dfbce63a89 311 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 312
elmot 1:d0dfbce63a89 313 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
elmot 1:d0dfbce63a89 314 __HAL_RNG_ENABLE_IT(hrng);
elmot 1:d0dfbce63a89 315 }
elmot 1:d0dfbce63a89 316 else
elmot 1:d0dfbce63a89 317 {
elmot 1:d0dfbce63a89 318 /* Process Unlocked */
elmot 1:d0dfbce63a89 319 __HAL_UNLOCK(hrng);
elmot 1:d0dfbce63a89 320
elmot 1:d0dfbce63a89 321 status = HAL_ERROR;
elmot 1:d0dfbce63a89 322 }
elmot 1:d0dfbce63a89 323
elmot 1:d0dfbce63a89 324 return status;
elmot 1:d0dfbce63a89 325 }
elmot 1:d0dfbce63a89 326
elmot 1:d0dfbce63a89 327 /**
elmot 1:d0dfbce63a89 328 * @brief Handle RNG interrupt request.
elmot 1:d0dfbce63a89 329 * @note In the case of a clock error, the RNG is no more able to generate
elmot 1:d0dfbce63a89 330 * random numbers because the PLL48CLK clock is not correct. User has
elmot 1:d0dfbce63a89 331 * to check that the clock controller is correctly configured to provide
elmot 1:d0dfbce63a89 332 * the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
elmot 1:d0dfbce63a89 333 * The clock error has no impact on the previously generated
elmot 1:d0dfbce63a89 334 * random numbers, and the RNG_DR register contents can be used.
elmot 1:d0dfbce63a89 335 * @note In the case of a seed error, the generation of random numbers is
elmot 1:d0dfbce63a89 336 * interrupted as long as the SECS bit is '1'. If a number is
elmot 1:d0dfbce63a89 337 * available in the RNG_DR register, it must not be used because it may
elmot 1:d0dfbce63a89 338 * not have enough entropy. In this case, it is recommended to clear the
elmot 1:d0dfbce63a89 339 * SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
elmot 1:d0dfbce63a89 340 * the RNG peripheral to reinitialize and restart the RNG.
elmot 1:d0dfbce63a89 341 * @note User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
elmot 1:d0dfbce63a89 342 * or CEIS are set.
elmot 1:d0dfbce63a89 343 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 344 * @retval None
elmot 1:d0dfbce63a89 345
elmot 1:d0dfbce63a89 346 */
elmot 1:d0dfbce63a89 347 void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 348 {
elmot 1:d0dfbce63a89 349 /* RNG clock error interrupt occurred */
elmot 1:d0dfbce63a89 350 if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET))
elmot 1:d0dfbce63a89 351 {
elmot 1:d0dfbce63a89 352 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 353 hrng->State = HAL_RNG_STATE_ERROR;
elmot 1:d0dfbce63a89 354
elmot 1:d0dfbce63a89 355 HAL_RNG_ErrorCallback(hrng);
elmot 1:d0dfbce63a89 356
elmot 1:d0dfbce63a89 357 /* Clear the clock error flag */
elmot 1:d0dfbce63a89 358 __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI);
elmot 1:d0dfbce63a89 359
elmot 1:d0dfbce63a89 360 }
elmot 1:d0dfbce63a89 361
elmot 1:d0dfbce63a89 362 /* Check RNG data ready interrupt occurred */
elmot 1:d0dfbce63a89 363 if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
elmot 1:d0dfbce63a89 364 {
elmot 1:d0dfbce63a89 365 /* Generate random number once, so disable the IT */
elmot 1:d0dfbce63a89 366 __HAL_RNG_DISABLE_IT(hrng);
elmot 1:d0dfbce63a89 367
elmot 1:d0dfbce63a89 368 /* Get the 32bit Random number (DRDY flag automatically cleared) */
elmot 1:d0dfbce63a89 369 hrng->RandomNumber = hrng->Instance->DR;
elmot 1:d0dfbce63a89 370
elmot 1:d0dfbce63a89 371 if(hrng->State != HAL_RNG_STATE_ERROR)
elmot 1:d0dfbce63a89 372 {
elmot 1:d0dfbce63a89 373 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 374 hrng->State = HAL_RNG_STATE_READY;
elmot 1:d0dfbce63a89 375
elmot 1:d0dfbce63a89 376 /* Data Ready callback */
elmot 1:d0dfbce63a89 377 HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
elmot 1:d0dfbce63a89 378 }
elmot 1:d0dfbce63a89 379 }
elmot 1:d0dfbce63a89 380 }
elmot 1:d0dfbce63a89 381
elmot 1:d0dfbce63a89 382 /**
elmot 1:d0dfbce63a89 383 * @brief Return generated random number in polling mode (Obsolete).
elmot 1:d0dfbce63a89 384 * @note Use HAL_RNG_GenerateRandomNumber() API instead.
elmot 1:d0dfbce63a89 385 * @param hrng: pointer to a RNG_HandleTypeDef structure that contains
elmot 1:d0dfbce63a89 386 * the configuration information for RNG.
elmot 1:d0dfbce63a89 387 * @retval random value
elmot 1:d0dfbce63a89 388 */
elmot 1:d0dfbce63a89 389 uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 390 {
elmot 1:d0dfbce63a89 391 if(HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK)
elmot 1:d0dfbce63a89 392 {
elmot 1:d0dfbce63a89 393 return hrng->RandomNumber;
elmot 1:d0dfbce63a89 394 }
elmot 1:d0dfbce63a89 395 else
elmot 1:d0dfbce63a89 396 {
elmot 1:d0dfbce63a89 397 return 0;
elmot 1:d0dfbce63a89 398 }
elmot 1:d0dfbce63a89 399 }
elmot 1:d0dfbce63a89 400
elmot 1:d0dfbce63a89 401
elmot 1:d0dfbce63a89 402 /**
elmot 1:d0dfbce63a89 403 * @brief Return a 32-bit random number with interrupt enabled (Obsolete).
elmot 1:d0dfbce63a89 404 * @note Use HAL_RNG_GenerateRandomNumber_IT() API instead.
elmot 1:d0dfbce63a89 405 * @param hrng: RNG handle
elmot 1:d0dfbce63a89 406 * @retval 32-bit random number
elmot 1:d0dfbce63a89 407 */
elmot 1:d0dfbce63a89 408 uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 409 {
elmot 1:d0dfbce63a89 410 uint32_t random32bit = 0;
elmot 1:d0dfbce63a89 411
elmot 1:d0dfbce63a89 412 /* Process locked */
elmot 1:d0dfbce63a89 413 __HAL_LOCK(hrng);
elmot 1:d0dfbce63a89 414
elmot 1:d0dfbce63a89 415 /* Change RNG peripheral state */
elmot 1:d0dfbce63a89 416 hrng->State = HAL_RNG_STATE_BUSY;
elmot 1:d0dfbce63a89 417
elmot 1:d0dfbce63a89 418 /* Get a 32bit Random number */
elmot 1:d0dfbce63a89 419 random32bit = hrng->Instance->DR;
elmot 1:d0dfbce63a89 420
elmot 1:d0dfbce63a89 421 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */
elmot 1:d0dfbce63a89 422 __HAL_RNG_ENABLE_IT(hrng);
elmot 1:d0dfbce63a89 423
elmot 1:d0dfbce63a89 424 /* Return the 32 bit random number */
elmot 1:d0dfbce63a89 425 return random32bit;
elmot 1:d0dfbce63a89 426 }
elmot 1:d0dfbce63a89 427
elmot 1:d0dfbce63a89 428
elmot 1:d0dfbce63a89 429
elmot 1:d0dfbce63a89 430 /**
elmot 1:d0dfbce63a89 431 * @brief Read latest generated random number.
elmot 1:d0dfbce63a89 432 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 433 * @retval random value
elmot 1:d0dfbce63a89 434 */
elmot 1:d0dfbce63a89 435 uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 436 {
elmot 1:d0dfbce63a89 437 return(hrng->RandomNumber);
elmot 1:d0dfbce63a89 438 }
elmot 1:d0dfbce63a89 439
elmot 1:d0dfbce63a89 440 /**
elmot 1:d0dfbce63a89 441 * @brief Data Ready callback in non-blocking mode.
elmot 1:d0dfbce63a89 442 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 443 * @param random32bit: generated random value
elmot 1:d0dfbce63a89 444 * @retval None
elmot 1:d0dfbce63a89 445 */
elmot 1:d0dfbce63a89 446 __weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit)
elmot 1:d0dfbce63a89 447 {
elmot 1:d0dfbce63a89 448 /* Prevent unused argument(s) compilation warning */
elmot 1:d0dfbce63a89 449 UNUSED(hrng);
elmot 1:d0dfbce63a89 450 UNUSED(random32bit);
elmot 1:d0dfbce63a89 451
elmot 1:d0dfbce63a89 452 /* NOTE : This function should not be modified. When the callback is needed,
elmot 1:d0dfbce63a89 453 function HAL_RNG_ReadyDataCallback must be implemented in the user file.
elmot 1:d0dfbce63a89 454 */
elmot 1:d0dfbce63a89 455 }
elmot 1:d0dfbce63a89 456
elmot 1:d0dfbce63a89 457 /**
elmot 1:d0dfbce63a89 458 * @brief RNG error callback.
elmot 1:d0dfbce63a89 459 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 460 * @retval None
elmot 1:d0dfbce63a89 461 */
elmot 1:d0dfbce63a89 462 __weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 463 {
elmot 1:d0dfbce63a89 464 /* Prevent unused argument(s) compilation warning */
elmot 1:d0dfbce63a89 465 UNUSED(hrng);
elmot 1:d0dfbce63a89 466
elmot 1:d0dfbce63a89 467 /* NOTE : This function should not be modified. When the callback is needed,
elmot 1:d0dfbce63a89 468 function HAL_RNG_ErrorCallback must be implemented in the user file.
elmot 1:d0dfbce63a89 469 */
elmot 1:d0dfbce63a89 470 }
elmot 1:d0dfbce63a89 471
elmot 1:d0dfbce63a89 472 /**
elmot 1:d0dfbce63a89 473 * @}
elmot 1:d0dfbce63a89 474 */
elmot 1:d0dfbce63a89 475
elmot 1:d0dfbce63a89 476 /** @addtogroup RNG_Exported_Functions_Group3
elmot 1:d0dfbce63a89 477 * @brief Peripheral State functions.
elmot 1:d0dfbce63a89 478 *
elmot 1:d0dfbce63a89 479 @verbatim
elmot 1:d0dfbce63a89 480 ===============================================================================
elmot 1:d0dfbce63a89 481 ##### Peripheral State functions #####
elmot 1:d0dfbce63a89 482 ===============================================================================
elmot 1:d0dfbce63a89 483 [..]
elmot 1:d0dfbce63a89 484 This subsection permits to get in run-time the status of the peripheral.
elmot 1:d0dfbce63a89 485
elmot 1:d0dfbce63a89 486 @endverbatim
elmot 1:d0dfbce63a89 487 * @{
elmot 1:d0dfbce63a89 488 */
elmot 1:d0dfbce63a89 489
elmot 1:d0dfbce63a89 490 /**
elmot 1:d0dfbce63a89 491 * @brief Return the RNG handle state.
elmot 1:d0dfbce63a89 492 * @param hrng: pointer to a RNG_HandleTypeDef structure.
elmot 1:d0dfbce63a89 493 * @retval HAL state
elmot 1:d0dfbce63a89 494 */
elmot 1:d0dfbce63a89 495 HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng)
elmot 1:d0dfbce63a89 496 {
elmot 1:d0dfbce63a89 497 /* Return RNG handle state */
elmot 1:d0dfbce63a89 498 return hrng->State;
elmot 1:d0dfbce63a89 499 }
elmot 1:d0dfbce63a89 500
elmot 1:d0dfbce63a89 501 /**
elmot 1:d0dfbce63a89 502 * @}
elmot 1:d0dfbce63a89 503 */
elmot 1:d0dfbce63a89 504
elmot 1:d0dfbce63a89 505 /**
elmot 1:d0dfbce63a89 506 * @}
elmot 1:d0dfbce63a89 507 */
elmot 1:d0dfbce63a89 508
elmot 1:d0dfbce63a89 509
elmot 1:d0dfbce63a89 510 #endif /* HAL_RNG_MODULE_ENABLED */
elmot 1:d0dfbce63a89 511 /**
elmot 1:d0dfbce63a89 512 * @}
elmot 1:d0dfbce63a89 513 */
elmot 1:d0dfbce63a89 514
elmot 1:d0dfbce63a89 515 /**
elmot 1:d0dfbce63a89 516 * @}
elmot 1:d0dfbce63a89 517 */
elmot 1:d0dfbce63a89 518
elmot 1:d0dfbce63a89 519 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/