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 *
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 ******************************************************************************
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 ******************************************************************************
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
65 * @{
66 */
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
80 * @brief Initialization and Configuration functions.
81 *
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 */
HAL_CRC_Init(CRC_HandleTypeDef * hcrc)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 */
HAL_CRC_DeInit(CRC_HandleTypeDef * hcrc)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 __HAL_CRC_SET_IDR(hcrc, 0);
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 */
HAL_CRC_MspInit(CRC_HandleTypeDef * hcrc)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 */
HAL_CRC_MspDeInit(CRC_HandleTypeDef * hcrc)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
253 * @brief management functions.
254 *
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 */
HAL_CRC_Accumulate(CRC_HandleTypeDef * hcrc,uint32_t pBuffer[],uint32_t BufferLength)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 */
HAL_CRC_Calculate(CRC_HandleTypeDef * hcrc,uint32_t pBuffer[],uint32_t BufferLength)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
388 * @brief Peripheral State functions.
389 *
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 */
HAL_CRC_GetState(CRC_HandleTypeDef * hcrc)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
421 * @{
422 */
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 */
CRC_Handle_8(CRC_HandleTypeDef * hcrc,uint8_t pBuffer[],uint32_t BufferLength)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 */
CRC_Handle_16(CRC_HandleTypeDef * hcrc,uint16_t pBuffer[],uint32_t BufferLength)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 */
517
