Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 1 | /** |
| 2 | ****************************************************************************** |
| 3 | * @file stm32l0xx_hal_crc.c |
| 4 | * @author MCD Application Team |
| 5 | * @brief CRC HAL module driver. |
| 6 | * This file provides firmware functions to manage the following |
| 7 | * functionalities of the Cyclic Redundancy Check (CRC) peripheral: |
| 8 | * + Initialization and de-initialization functions |
| 9 | * + Peripheral Control functions |
| 10 | * + Peripheral State functions |
| 11 | * |
Ali Labbene | a076e9d | 2022-04-05 14:23:52 +0100 | [diff] [blame] | 12 | ****************************************************************************** |
| 13 | * @attention |
| 14 | * |
| 15 | * Copyright (c) 2016 STMicroelectronics. |
| 16 | * All rights reserved. |
| 17 | * |
| 18 | * This software is licensed under terms that can be found in the LICENSE file |
| 19 | * in the root directory of this software component. |
| 20 | * If no LICENSE file comes with this software, it is provided AS-IS. |
| 21 | * |
| 22 | ****************************************************************************** |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 23 | @verbatim |
| 24 | =============================================================================== |
| 25 | ##### How to use this driver ##### |
| 26 | =============================================================================== |
| 27 | [..] |
| 28 | (+) Enable CRC AHB clock using __HAL_RCC_CRC_CLK_ENABLE(); |
| 29 | (+) Initialize CRC calculator |
| 30 | (++) specify generating polynomial (peripheral default or non-default one) |
| 31 | (++) specify initialization value (peripheral default or non-default one) |
| 32 | (++) specify input data format |
| 33 | (++) specify input or output data inversion mode if any |
| 34 | (+) Use HAL_CRC_Accumulate() function to compute the CRC value of the |
| 35 | input data buffer starting with the previously computed CRC as |
| 36 | initialization value |
| 37 | (+) Use HAL_CRC_Calculate() function to compute the CRC value of the |
| 38 | input data buffer starting with the defined initialization value |
| 39 | (default or non-default) to initiate CRC calculation |
| 40 | |
| 41 | @endverbatim |
| 42 | ****************************************************************************** |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 43 | */ |
| 44 | |
| 45 | /* Includes ------------------------------------------------------------------*/ |
| 46 | #include "stm32l0xx_hal.h" |
| 47 | |
| 48 | /** @addtogroup STM32L0xx_HAL_Driver |
| 49 | * @{ |
| 50 | */ |
| 51 | |
| 52 | /** @defgroup CRC CRC |
| 53 | * @brief CRC HAL module driver. |
| 54 | * @{ |
| 55 | */ |
| 56 | |
| 57 | #ifdef HAL_CRC_MODULE_ENABLED |
| 58 | |
| 59 | /* Private typedef -----------------------------------------------------------*/ |
| 60 | /* Private define ------------------------------------------------------------*/ |
| 61 | /* Private macro -------------------------------------------------------------*/ |
| 62 | /* Private variables ---------------------------------------------------------*/ |
| 63 | /* Private function prototypes -----------------------------------------------*/ |
| 64 | /** @defgroup CRC_Private_Functions CRC Private Functions |
rihab kouki | 343e564 | 2021-08-05 11:08:47 +0100 | [diff] [blame] | 65 | * @{ |
| 66 | */ |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 67 | static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength); |
| 68 | static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength); |
| 69 | /** |
| 70 | * @} |
| 71 | */ |
| 72 | |
| 73 | /* Exported functions --------------------------------------------------------*/ |
| 74 | |
| 75 | /** @defgroup CRC_Exported_Functions CRC Exported Functions |
| 76 | * @{ |
| 77 | */ |
| 78 | |
| 79 | /** @defgroup CRC_Exported_Functions_Group1 Initialization and de-initialization functions |
rihab kouki | 343e564 | 2021-08-05 11:08:47 +0100 | [diff] [blame] | 80 | * @brief Initialization and Configuration functions. |
| 81 | * |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 82 | @verbatim |
| 83 | =============================================================================== |
| 84 | ##### Initialization and de-initialization functions ##### |
| 85 | =============================================================================== |
| 86 | [..] This section provides functions allowing to: |
| 87 | (+) Initialize the CRC according to the specified parameters |
| 88 | in the CRC_InitTypeDef and create the associated handle |
| 89 | (+) DeInitialize the CRC peripheral |
| 90 | (+) Initialize the CRC MSP (MCU Specific Package) |
| 91 | (+) DeInitialize the CRC MSP |
| 92 | |
| 93 | @endverbatim |
| 94 | * @{ |
| 95 | */ |
| 96 | |
| 97 | /** |
| 98 | * @brief Initialize the CRC according to the specified |
| 99 | * parameters in the CRC_InitTypeDef and create the associated handle. |
| 100 | * @param hcrc CRC handle |
| 101 | * @retval HAL status |
| 102 | */ |
| 103 | HAL_StatusTypeDef HAL_CRC_Init(CRC_HandleTypeDef *hcrc) |
| 104 | { |
| 105 | /* Check the CRC handle allocation */ |
| 106 | if (hcrc == NULL) |
| 107 | { |
| 108 | return HAL_ERROR; |
| 109 | } |
| 110 | |
| 111 | /* Check the parameters */ |
| 112 | assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance)); |
| 113 | |
| 114 | if (hcrc->State == HAL_CRC_STATE_RESET) |
| 115 | { |
| 116 | /* Allocate lock resource and initialize it */ |
| 117 | hcrc->Lock = HAL_UNLOCKED; |
| 118 | /* Init the low level hardware */ |
| 119 | HAL_CRC_MspInit(hcrc); |
| 120 | } |
| 121 | |
| 122 | hcrc->State = HAL_CRC_STATE_BUSY; |
| 123 | |
| 124 | /* check whether or not non-default generating polynomial has been |
| 125 | * picked up by user */ |
| 126 | assert_param(IS_DEFAULT_POLYNOMIAL(hcrc->Init.DefaultPolynomialUse)); |
| 127 | if (hcrc->Init.DefaultPolynomialUse == DEFAULT_POLYNOMIAL_ENABLE) |
| 128 | { |
| 129 | /* initialize peripheral with default generating polynomial */ |
| 130 | WRITE_REG(hcrc->Instance->POL, DEFAULT_CRC32_POLY); |
| 131 | MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_32B); |
| 132 | } |
| 133 | else |
| 134 | { |
| 135 | /* initialize CRC peripheral with generating polynomial defined by user */ |
| 136 | if (HAL_CRCEx_Polynomial_Set(hcrc, hcrc->Init.GeneratingPolynomial, hcrc->Init.CRCLength) != HAL_OK) |
| 137 | { |
| 138 | return HAL_ERROR; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /* check whether or not non-default CRC initial value has been |
| 143 | * picked up by user */ |
| 144 | assert_param(IS_DEFAULT_INIT_VALUE(hcrc->Init.DefaultInitValueUse)); |
| 145 | if (hcrc->Init.DefaultInitValueUse == DEFAULT_INIT_VALUE_ENABLE) |
| 146 | { |
| 147 | WRITE_REG(hcrc->Instance->INIT, DEFAULT_CRC_INITVALUE); |
| 148 | } |
| 149 | else |
| 150 | { |
| 151 | WRITE_REG(hcrc->Instance->INIT, hcrc->Init.InitValue); |
| 152 | } |
| 153 | |
| 154 | |
| 155 | /* set input data inversion mode */ |
| 156 | assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(hcrc->Init.InputDataInversionMode)); |
| 157 | MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, hcrc->Init.InputDataInversionMode); |
| 158 | |
| 159 | /* set output data inversion mode */ |
| 160 | assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(hcrc->Init.OutputDataInversionMode)); |
| 161 | MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, hcrc->Init.OutputDataInversionMode); |
| 162 | |
| 163 | /* makes sure the input data format (bytes, halfwords or words stream) |
| 164 | * is properly specified by user */ |
| 165 | assert_param(IS_CRC_INPUTDATA_FORMAT(hcrc->InputDataFormat)); |
| 166 | |
| 167 | /* Change CRC peripheral state */ |
| 168 | hcrc->State = HAL_CRC_STATE_READY; |
| 169 | |
| 170 | /* Return function status */ |
| 171 | return HAL_OK; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * @brief DeInitialize the CRC peripheral. |
| 176 | * @param hcrc CRC handle |
| 177 | * @retval HAL status |
| 178 | */ |
| 179 | HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc) |
| 180 | { |
| 181 | /* Check the CRC handle allocation */ |
| 182 | if (hcrc == NULL) |
| 183 | { |
| 184 | return HAL_ERROR; |
| 185 | } |
| 186 | |
| 187 | /* Check the parameters */ |
| 188 | assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance)); |
| 189 | |
| 190 | /* Check the CRC peripheral state */ |
| 191 | if (hcrc->State == HAL_CRC_STATE_BUSY) |
| 192 | { |
| 193 | return HAL_BUSY; |
| 194 | } |
| 195 | |
| 196 | /* Change CRC peripheral state */ |
| 197 | hcrc->State = HAL_CRC_STATE_BUSY; |
| 198 | |
| 199 | /* Reset CRC calculation unit */ |
| 200 | __HAL_CRC_DR_RESET(hcrc); |
| 201 | |
| 202 | /* Reset IDR register content */ |
| 203 | CLEAR_BIT(hcrc->Instance->IDR, CRC_IDR_IDR); |
| 204 | |
| 205 | /* DeInit the low level hardware */ |
| 206 | HAL_CRC_MspDeInit(hcrc); |
| 207 | |
| 208 | /* Change CRC peripheral state */ |
| 209 | hcrc->State = HAL_CRC_STATE_RESET; |
| 210 | |
| 211 | /* Process unlocked */ |
| 212 | __HAL_UNLOCK(hcrc); |
| 213 | |
| 214 | /* Return function status */ |
| 215 | return HAL_OK; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * @brief Initializes the CRC MSP. |
| 220 | * @param hcrc CRC handle |
| 221 | * @retval None |
| 222 | */ |
| 223 | __weak void HAL_CRC_MspInit(CRC_HandleTypeDef *hcrc) |
| 224 | { |
| 225 | /* Prevent unused argument(s) compilation warning */ |
| 226 | UNUSED(hcrc); |
| 227 | |
| 228 | /* NOTE : This function should not be modified, when the callback is needed, |
| 229 | the HAL_CRC_MspInit can be implemented in the user file |
| 230 | */ |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * @brief DeInitialize the CRC MSP. |
| 235 | * @param hcrc CRC handle |
| 236 | * @retval None |
| 237 | */ |
| 238 | __weak void HAL_CRC_MspDeInit(CRC_HandleTypeDef *hcrc) |
| 239 | { |
| 240 | /* Prevent unused argument(s) compilation warning */ |
| 241 | UNUSED(hcrc); |
| 242 | |
| 243 | /* NOTE : This function should not be modified, when the callback is needed, |
| 244 | the HAL_CRC_MspDeInit can be implemented in the user file |
| 245 | */ |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * @} |
| 250 | */ |
| 251 | |
| 252 | /** @defgroup CRC_Exported_Functions_Group2 Peripheral Control functions |
rihab kouki | 343e564 | 2021-08-05 11:08:47 +0100 | [diff] [blame] | 253 | * @brief management functions. |
| 254 | * |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 255 | @verbatim |
| 256 | =============================================================================== |
| 257 | ##### Peripheral Control functions ##### |
| 258 | =============================================================================== |
| 259 | [..] This section provides functions allowing to: |
| 260 | (+) compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer |
| 261 | using combination of the previous CRC value and the new one. |
| 262 | |
| 263 | [..] or |
| 264 | |
| 265 | (+) compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer |
| 266 | independently of the previous CRC value. |
| 267 | |
| 268 | @endverbatim |
| 269 | * @{ |
| 270 | */ |
| 271 | |
| 272 | /** |
| 273 | * @brief Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer |
| 274 | * starting with the previously computed CRC as initialization value. |
| 275 | * @param hcrc CRC handle |
| 276 | * @param pBuffer pointer to the input data buffer, exact input data format is |
| 277 | * provided by hcrc->InputDataFormat. |
| 278 | * @param BufferLength input data buffer length (number of bytes if pBuffer |
| 279 | * type is * uint8_t, number of half-words if pBuffer type is * uint16_t, |
| 280 | * number of words if pBuffer type is * uint32_t). |
| 281 | * @note By default, the API expects a uint32_t pointer as input buffer parameter. |
| 282 | * Input buffer pointers with other types simply need to be cast in uint32_t |
| 283 | * and the API will internally adjust its input data processing based on the |
| 284 | * handle field hcrc->InputDataFormat. |
| 285 | * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits) |
| 286 | */ |
| 287 | uint32_t HAL_CRC_Accumulate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength) |
| 288 | { |
| 289 | uint32_t index; /* CRC input data buffer index */ |
| 290 | uint32_t temp = 0U; /* CRC output (read from hcrc->Instance->DR register) */ |
| 291 | |
| 292 | /* Change CRC peripheral state */ |
| 293 | hcrc->State = HAL_CRC_STATE_BUSY; |
| 294 | |
| 295 | switch (hcrc->InputDataFormat) |
| 296 | { |
| 297 | case CRC_INPUTDATA_FORMAT_WORDS: |
| 298 | /* Enter Data to the CRC calculator */ |
| 299 | for (index = 0U; index < BufferLength; index++) |
| 300 | { |
| 301 | hcrc->Instance->DR = pBuffer[index]; |
| 302 | } |
| 303 | temp = hcrc->Instance->DR; |
| 304 | break; |
| 305 | |
| 306 | case CRC_INPUTDATA_FORMAT_BYTES: |
| 307 | temp = CRC_Handle_8(hcrc, (uint8_t *)pBuffer, BufferLength); |
| 308 | break; |
| 309 | |
| 310 | case CRC_INPUTDATA_FORMAT_HALFWORDS: |
| 311 | temp = CRC_Handle_16(hcrc, (uint16_t *)(void *)pBuffer, BufferLength); /* Derogation MisraC2012 R.11.5 */ |
| 312 | break; |
| 313 | default: |
| 314 | break; |
| 315 | } |
| 316 | |
| 317 | /* Change CRC peripheral state */ |
| 318 | hcrc->State = HAL_CRC_STATE_READY; |
| 319 | |
| 320 | /* Return the CRC computed value */ |
| 321 | return temp; |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * @brief Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer |
| 326 | * starting with hcrc->Instance->INIT as initialization value. |
| 327 | * @param hcrc CRC handle |
| 328 | * @param pBuffer pointer to the input data buffer, exact input data format is |
| 329 | * provided by hcrc->InputDataFormat. |
| 330 | * @param BufferLength input data buffer length (number of bytes if pBuffer |
| 331 | * type is * uint8_t, number of half-words if pBuffer type is * uint16_t, |
| 332 | * number of words if pBuffer type is * uint32_t). |
| 333 | * @note By default, the API expects a uint32_t pointer as input buffer parameter. |
| 334 | * Input buffer pointers with other types simply need to be cast in uint32_t |
| 335 | * and the API will internally adjust its input data processing based on the |
| 336 | * handle field hcrc->InputDataFormat. |
| 337 | * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits) |
| 338 | */ |
| 339 | uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength) |
| 340 | { |
| 341 | uint32_t index; /* CRC input data buffer index */ |
| 342 | uint32_t temp = 0U; /* CRC output (read from hcrc->Instance->DR register) */ |
| 343 | |
| 344 | /* Change CRC peripheral state */ |
| 345 | hcrc->State = HAL_CRC_STATE_BUSY; |
| 346 | |
| 347 | /* Reset CRC Calculation Unit (hcrc->Instance->INIT is |
| 348 | * written in hcrc->Instance->DR) */ |
| 349 | __HAL_CRC_DR_RESET(hcrc); |
| 350 | |
| 351 | switch (hcrc->InputDataFormat) |
| 352 | { |
| 353 | case CRC_INPUTDATA_FORMAT_WORDS: |
| 354 | /* Enter 32-bit input data to the CRC calculator */ |
| 355 | for (index = 0U; index < BufferLength; index++) |
| 356 | { |
| 357 | hcrc->Instance->DR = pBuffer[index]; |
| 358 | } |
| 359 | temp = hcrc->Instance->DR; |
| 360 | break; |
| 361 | |
| 362 | case CRC_INPUTDATA_FORMAT_BYTES: |
| 363 | /* Specific 8-bit input data handling */ |
| 364 | temp = CRC_Handle_8(hcrc, (uint8_t *)pBuffer, BufferLength); |
| 365 | break; |
| 366 | |
| 367 | case CRC_INPUTDATA_FORMAT_HALFWORDS: |
| 368 | /* Specific 16-bit input data handling */ |
| 369 | temp = CRC_Handle_16(hcrc, (uint16_t *)(void *)pBuffer, BufferLength); /* Derogation MisraC2012 R.11.5 */ |
| 370 | break; |
| 371 | |
| 372 | default: |
| 373 | break; |
| 374 | } |
| 375 | |
| 376 | /* Change CRC peripheral state */ |
| 377 | hcrc->State = HAL_CRC_STATE_READY; |
| 378 | |
| 379 | /* Return the CRC computed value */ |
| 380 | return temp; |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * @} |
| 385 | */ |
| 386 | |
| 387 | /** @defgroup CRC_Exported_Functions_Group3 Peripheral State functions |
rihab kouki | 343e564 | 2021-08-05 11:08:47 +0100 | [diff] [blame] | 388 | * @brief Peripheral State functions. |
| 389 | * |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 390 | @verbatim |
| 391 | =============================================================================== |
| 392 | ##### Peripheral State functions ##### |
| 393 | =============================================================================== |
| 394 | [..] |
| 395 | This subsection permits to get in run-time the status of the peripheral. |
| 396 | |
| 397 | @endverbatim |
| 398 | * @{ |
| 399 | */ |
| 400 | |
| 401 | /** |
| 402 | * @brief Return the CRC handle state. |
| 403 | * @param hcrc CRC handle |
| 404 | * @retval HAL state |
| 405 | */ |
| 406 | HAL_CRC_StateTypeDef HAL_CRC_GetState(CRC_HandleTypeDef *hcrc) |
| 407 | { |
| 408 | /* Return CRC handle state */ |
| 409 | return hcrc->State; |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * @} |
| 414 | */ |
| 415 | |
| 416 | /** |
| 417 | * @} |
| 418 | */ |
| 419 | |
| 420 | /** @addtogroup CRC_Private_Functions |
rihab kouki | 343e564 | 2021-08-05 11:08:47 +0100 | [diff] [blame] | 421 | * @{ |
| 422 | */ |
Ali Labbene | b6be1fc | 2020-01-29 16:22:38 +0100 | [diff] [blame] | 423 | |
| 424 | /** |
| 425 | * @brief Enter 8-bit input data to the CRC calculator. |
| 426 | * Specific data handling to optimize processing time. |
| 427 | * @param hcrc CRC handle |
| 428 | * @param pBuffer pointer to the input data buffer |
| 429 | * @param BufferLength input data buffer length |
| 430 | * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits) |
| 431 | */ |
| 432 | static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength) |
| 433 | { |
| 434 | uint32_t i; /* input data buffer index */ |
| 435 | uint16_t data; |
| 436 | __IO uint16_t *pReg; |
| 437 | |
| 438 | /* Processing time optimization: 4 bytes are entered in a row with a single word write, |
| 439 | * last bytes must be carefully fed to the CRC calculator to ensure a correct type |
| 440 | * handling by the peripheral */ |
| 441 | for (i = 0U; i < (BufferLength / 4U); i++) |
| 442 | { |
| 443 | hcrc->Instance->DR = ((uint32_t)pBuffer[4U * i] << 24U) | \ |
| 444 | ((uint32_t)pBuffer[(4U * i) + 1U] << 16U) | \ |
| 445 | ((uint32_t)pBuffer[(4U * i) + 2U] << 8U) | \ |
| 446 | (uint32_t)pBuffer[(4U * i) + 3U]; |
| 447 | } |
| 448 | /* last bytes specific handling */ |
| 449 | if ((BufferLength % 4U) != 0U) |
| 450 | { |
| 451 | if ((BufferLength % 4U) == 1U) |
| 452 | { |
| 453 | *(__IO uint8_t *)(__IO void *)(&hcrc->Instance->DR) = pBuffer[4U * i]; /* Derogation MisraC2012 R.11.5 */ |
| 454 | } |
| 455 | if ((BufferLength % 4U) == 2U) |
| 456 | { |
| 457 | data = ((uint16_t)(pBuffer[4U * i]) << 8U) | (uint16_t)pBuffer[(4U * i) + 1U]; |
| 458 | pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR); /* Derogation MisraC2012 R.11.5 */ |
| 459 | *pReg = data; |
| 460 | } |
| 461 | if ((BufferLength % 4U) == 3U) |
| 462 | { |
| 463 | data = ((uint16_t)(pBuffer[4U * i]) << 8U) | (uint16_t)pBuffer[(4U * i) + 1U]; |
| 464 | pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR); /* Derogation MisraC2012 R.11.5 */ |
| 465 | *pReg = data; |
| 466 | |
| 467 | *(__IO uint8_t *)(__IO void *)(&hcrc->Instance->DR) = pBuffer[(4U * i) + 2U]; /* Derogation MisraC2012 R.11.5 */ |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* Return the CRC computed value */ |
| 472 | return hcrc->Instance->DR; |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * @brief Enter 16-bit input data to the CRC calculator. |
| 477 | * Specific data handling to optimize processing time. |
| 478 | * @param hcrc CRC handle |
| 479 | * @param pBuffer pointer to the input data buffer |
| 480 | * @param BufferLength input data buffer length |
| 481 | * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits) |
| 482 | */ |
| 483 | static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength) |
| 484 | { |
| 485 | uint32_t i; /* input data buffer index */ |
| 486 | __IO uint16_t *pReg; |
| 487 | |
| 488 | /* Processing time optimization: 2 HalfWords are entered in a row with a single word write, |
| 489 | * in case of odd length, last HalfWord must be carefully fed to the CRC calculator to ensure |
| 490 | * a correct type handling by the peripheral */ |
| 491 | for (i = 0U; i < (BufferLength / 2U); i++) |
| 492 | { |
| 493 | hcrc->Instance->DR = ((uint32_t)pBuffer[2U * i] << 16U) | (uint32_t)pBuffer[(2U * i) + 1U]; |
| 494 | } |
| 495 | if ((BufferLength % 2U) != 0U) |
| 496 | { |
| 497 | pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR); /* Derogation MisraC2012 R.11.5 */ |
| 498 | *pReg = pBuffer[2U * i]; |
| 499 | } |
| 500 | |
| 501 | /* Return the CRC computed value */ |
| 502 | return hcrc->Instance->DR; |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * @} |
| 507 | */ |
| 508 | |
| 509 | #endif /* HAL_CRC_MODULE_ENABLED */ |
| 510 | /** |
| 511 | * @} |
| 512 | */ |
| 513 | |
| 514 | /** |
| 515 | * @} |
| 516 | */ |