| /** | |
| ****************************************************************************** | |
| * @file stm32f7xx_hal_crc_ex.c | |
| * @author MCD Application Team | |
| * @version V1.0.0 | |
| * @date 12-May-2015 | |
| * @brief Extended CRC HAL module driver. | |
| * | |
| * This file provides firmware functions to manage the following | |
| * functionalities of the CRC peripheral: | |
| * + Initialization/de-initialization functions | |
| * | |
| @verbatim | |
| ============================================================================== | |
| ##### CRC specific features ##### | |
| ============================================================================== | |
| [..] | |
| (#) Polynomial configuration. | |
| (#) Input data reverse mode. | |
| (#) Output data reverse mode. | |
| @endverbatim | |
| ****************************************************************************** | |
| * @attention | |
| * | |
| * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2> | |
| * | |
| * Redistribution and use in source and binary forms, with or without modification, | |
| * are permitted provided that the following conditions are met: | |
| * 1. Redistributions of source code must retain the above copyright notice, | |
| * this list of conditions and the following disclaimer. | |
| * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| * this list of conditions and the following disclaimer in the documentation | |
| * and/or other materials provided with the distribution. | |
| * 3. Neither the name of STMicroelectronics nor the names of its contributors | |
| * may be used to endorse or promote products derived from this software | |
| * without specific prior written permission. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| * | |
| ****************************************************************************** | |
| */ | |
| /* Includes ------------------------------------------------------------------*/ | |
| #include "stm32f7xx_hal.h" | |
| /** @addtogroup STM32F7xx_HAL_Driver | |
| * @{ | |
| */ | |
| /** @addtogroup CRCEx | |
| * @brief CRC Extended HAL module driver | |
| * @{ | |
| */ | |
| #ifdef HAL_CRC_MODULE_ENABLED | |
| /* Private typedef -----------------------------------------------------------*/ | |
| /* Private define ------------------------------------------------------------*/ | |
| /* Private macro -------------------------------------------------------------*/ | |
| /* Private variables ---------------------------------------------------------*/ | |
| /* Private function prototypes -----------------------------------------------*/ | |
| /* Private functions ---------------------------------------------------------*/ | |
| /** @addtogroup CRCEx_Exported_Functions | |
| * @{ | |
| */ | |
| /** @addtogroup CRCEx_Exported_Functions_Group1 | |
| * @brief Extended CRC features functions | |
| * | |
| @verbatim | |
| =============================================================================== | |
| ##### CRC Extended features functions ##### | |
| =============================================================================== | |
| [..] | |
| This subsection provides function allowing to: | |
| (+) Set CRC polynomial if different from default one. | |
| @endverbatim | |
| * @{ | |
| */ | |
| /** | |
| * @brief Initializes the CRC polynomial if different from default one. | |
| * @param hcrc: CRC handle | |
| * @param Pol: CRC generating polynomial (7, 8, 16 or 32-bit long) | |
| * This parameter is written in normal representation, e.g. | |
| * for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 | |
| * for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021 | |
| * @param PolyLength: CRC polynomial length | |
| * This parameter can be one of the following values: | |
| * @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7) | |
| * @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8) | |
| * @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16) | |
| * @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32) | |
| * @retval HAL status | |
| */ | |
| HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength) | |
| { | |
| uint32_t msb = 31; /* polynomial degree is 32 at most, so msb is initialized to max value */ | |
| /* Check the parameters */ | |
| assert_param(IS_CRC_POL_LENGTH(PolyLength)); | |
| /* check polynomial definition vs polynomial size: | |
| * polynomial length must be aligned with polynomial | |
| * definition. HAL_ERROR is reported if Pol degree is | |
| * larger than that indicated by PolyLength. | |
| * Look for MSB position: msb will contain the degree of | |
| * the second to the largest polynomial member. E.g., for | |
| * X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */ | |
| while (((Pol & ((uint32_t)(0x1) << msb)) == 0) && (msb-- > 0)) | |
| { | |
| } | |
| switch (PolyLength) | |
| { | |
| case CRC_POLYLENGTH_7B: | |
| if (msb >= HAL_CRC_LENGTH_7B) | |
| { | |
| return HAL_ERROR; | |
| } | |
| break; | |
| case CRC_POLYLENGTH_8B: | |
| if (msb >= HAL_CRC_LENGTH_8B) | |
| { | |
| return HAL_ERROR; | |
| } | |
| break; | |
| case CRC_POLYLENGTH_16B: | |
| if (msb >= HAL_CRC_LENGTH_16B) | |
| { | |
| return HAL_ERROR; | |
| } | |
| break; | |
| case CRC_POLYLENGTH_32B: | |
| /* no polynomial definition vs. polynomial length issue possible */ | |
| break; | |
| default: | |
| break; | |
| } | |
| /* set generating polynomial */ | |
| WRITE_REG(hcrc->Instance->POL, Pol); | |
| /* set generating polynomial size */ | |
| MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength); | |
| /* Return function status */ | |
| return HAL_OK; | |
| } | |
| /** | |
| * @brief Set the Reverse Input data mode. | |
| * @param hcrc: CRC handle | |
| * @param InputReverseMode: Input Data inversion mode | |
| * This parameter can be one of the following values: | |
| * @arg CRC_INPUTDATA_INVERSION_NONE: no change in bit order (default value) | |
| * @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal | |
| * @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal | |
| * @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal | |
| * @retval HAL status | |
| */ | |
| HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode) | |
| { | |
| /* Check the parameters */ | |
| assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode)); | |
| /* Change CRC peripheral state */ | |
| hcrc->State = HAL_CRC_STATE_BUSY; | |
| /* set input data inversion mode */ | |
| MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode); | |
| /* Change CRC peripheral state */ | |
| hcrc->State = HAL_CRC_STATE_READY; | |
| /* Return function status */ | |
| return HAL_OK; | |
| } | |
| /** | |
| * @brief Set the Reverse Output data mode. | |
| * @param hcrc: CRC handle | |
| * @param OutputReverseMode: Output Data inversion mode | |
| * This parameter can be one of the following values: | |
| * @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value) | |
| * @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD) | |
| * @retval HAL status | |
| */ | |
| HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode) | |
| { | |
| /* Check the parameters */ | |
| assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode)); | |
| /* Change CRC peripheral state */ | |
| hcrc->State = HAL_CRC_STATE_BUSY; | |
| /* set output data inversion mode */ | |
| MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode); | |
| /* Change CRC peripheral state */ | |
| hcrc->State = HAL_CRC_STATE_READY; | |
| /* Return function status */ | |
| return HAL_OK; | |
| } | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @} | |
| */ | |
| #endif /* HAL_CRC_MODULE_ENABLED */ | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @} | |
| */ | |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ | |