| /** |
| ****************************************************************************** |
| * @file stm32l4xx_hal_crc_ex.c |
| * @author MCD Application Team |
| * @brief Extended CRC HAL module driver. |
| * This file provides firmware functions to manage the extended |
| * functionalities of the CRC peripheral. |
| * |
| @verbatim |
| ================================================================================ |
| ##### How to use this driver ##### |
| ================================================================================ |
| [..] |
| (+) Set user-defined generating polynomial thru HAL_CRCEx_Polynomial_Set() |
| (+) Configure Input or Output data inversion |
| |
| @endverbatim |
| ****************************************************************************** |
| * @attention |
| * |
| * <h2><center>© COPYRIGHT(c) 2017 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 "stm32l4xx_hal.h" |
| |
| /** @addtogroup STM32L4xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @defgroup CRCEx CRCEx |
| * @brief CRC Extended HAL module driver |
| * @{ |
| */ |
| |
| #ifdef HAL_CRC_MODULE_ENABLED |
| |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private function prototypes -----------------------------------------------*/ |
| /* Exported functions --------------------------------------------------------*/ |
| |
| /** @defgroup CRCEx_Exported_Functions CRC Extended Exported Functions |
| * @{ |
| */ |
| |
| /** @defgroup CRCEx_Exported_Functions_Group1 Extended Initialization/de-initialization functions |
| * @brief Extended Initialization and Configuration functions. |
| * |
| @verbatim |
| =============================================================================== |
| ##### Extended configuration functions ##### |
| =============================================================================== |
| [..] This section provides functions allowing to: |
| (+) Configure the generating polynomial |
| (+) Configure the input data inversion |
| (+) Configure the output data inversion |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| |
| /** |
| * @brief Initialize 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. |
| * @arg for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 |
| * @arg 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 @ref CRC_POLYLENGTH_7B 7-bit long CRC (generating polynomial of degree 7) |
| * @arg @ref CRC_POLYLENGTH_8B 8-bit long CRC (generating polynomial of degree 8) |
| * @arg @ref CRC_POLYLENGTH_16B 16-bit long CRC (generating polynomial of degree 16) |
| * @arg @ref 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 & (1U << 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: |
| return HAL_ERROR; |
| } |
| |
| /* 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 @ref CRC_INPUTDATA_INVERSION_NONE no change in bit order (default value) |
| * @arg @ref CRC_INPUTDATA_INVERSION_BYTE Byte-wise bit reversal |
| * @arg @ref CRC_INPUTDATA_INVERSION_HALFWORD HalfWord-wise bit reversal |
| * @arg @ref 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 @ref CRC_OUTPUTDATA_INVERSION_DISABLE no CRC inversion (default value) |
| * @arg @ref 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****/ |