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/** |
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****************************************************************************** |
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* @file stm32f0xx_hal_crc_ex.c |
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* @author MCD Application Team |
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* @brief Extended CRC HAL module driver. |
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* This file provides firmware functions to manage the following |
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* functionalities of the CRC peripheral: |
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* + Extended initialization functions |
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* |
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@verbatim |
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================================================================================ |
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##### How to use this driver ##### |
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================================================================================ |
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[..] |
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(+) Extended initialization |
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(+) Set or not user-defined generating |
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polynomial other than default one |
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@endverbatim |
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****************************************************************************** |
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* @attention |
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* |
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2> |
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* |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* 3. Neither the name of STMicroelectronics nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************** |
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*/ |
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/* Includes ------------------------------------------------------------------*/ |
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#include "stm32f0xx_hal.h" |
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/** @addtogroup STM32F0xx_HAL_Driver |
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* @{ |
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*/ |
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/** @defgroup CRCEx CRCEx |
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* @brief CRC Extended HAL module driver |
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* @{ |
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*/ |
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#ifdef HAL_CRC_MODULE_ENABLED |
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/* Private typedef -----------------------------------------------------------*/ |
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/* Private define ------------------------------------------------------------*/ |
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/* Private macro -------------------------------------------------------------*/ |
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/* Private variables ---------------------------------------------------------*/ |
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/* Private function prototypes -----------------------------------------------*/ |
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/* Private functions ---------------------------------------------------------*/ |
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/** @defgroup CRCEx_Exported_Functions CRCEx Exported Functions |
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* @{ |
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*/ |
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/** @defgroup CRCEx_Exported_Functions_Group1 Extended Initialization/de-initialization functions |
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* @brief Extended Initialization and Configuration functions. |
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* |
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@verbatim |
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=============================================================================== |
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##### Initialization and Configuration functions ##### |
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=============================================================================== |
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[..] This section provides functions allowing to: |
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(+) Initialize the CRC generating polynomial: if programmable polynomial |
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feature is applicable to device, set default or non-default generating |
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polynomial according to hcrc->Init.DefaultPolynomialUse parameter. |
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If feature is non-applicable to device in use, HAL_CRCEx_Init straight |
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away reports HAL_OK. |
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(+) Set the generating polynomial |
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@endverbatim |
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* @{ |
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*/ |
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/** |
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* @brief Extended initialization to set generating polynomial |
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* @param hcrc CRC handle |
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* @retval HAL status |
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*/ |
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HAL_StatusTypeDef HAL_CRCEx_Init(CRC_HandleTypeDef *hcrc) |
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{ |
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#if defined(STM32F071xB) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined (STM32F098xx) |
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/* check whether or not non-default generating polynomial has been |
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* picked up by user */ |
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assert_param(IS_DEFAULT_POLYNOMIAL(hcrc->Init.DefaultPolynomialUse)); |
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if (hcrc->Init.DefaultPolynomialUse == DEFAULT_POLYNOMIAL_ENABLE) |
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{ |
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/* initialize IP with default generating polynomial */ |
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WRITE_REG(hcrc->Instance->POL, DEFAULT_CRC32_POLY); |
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_32B); |
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} |
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else |
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{ |
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/* initialize CRC IP with generating polynomial defined by user */ |
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if (HAL_CRCEx_Polynomial_Set(hcrc, hcrc->Init.GeneratingPolynomial, hcrc->Init.CRCLength) != HAL_OK) |
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{ |
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return HAL_ERROR; |
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} |
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} |
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#endif /* defined(STM32F071xB) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined (STM32F098xx) */ |
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return HAL_OK; |
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} |
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/** |
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* @brief Set the Reverse Input data mode. |
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* @param hcrc CRC handle |
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* @param InputReverseMode Input Data inversion mode |
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* This parameter can be one of the following values: |
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* @arg CRC_INPUTDATA_NOINVERSION: no change in bit order (default value) |
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* @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal |
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* @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal |
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* @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal |
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* @retval HAL status |
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*/ |
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HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode) |
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{ |
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/* Check the parameters */ |
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assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode)); |
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/* Change CRC peripheral state */ |
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hcrc->State = HAL_CRC_STATE_BUSY; |
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/* set input data inversion mode */ |
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode); |
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/* Change CRC peripheral state */ |
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hcrc->State = HAL_CRC_STATE_READY; |
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/* Return function status */ |
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return HAL_OK; |
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} |
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/** |
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* @brief Set the Reverse Output data mode. |
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* @param hcrc CRC handle |
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* @param OutputReverseMode Output Data inversion mode |
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* This parameter can be one of the following values: |
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* @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value) |
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* @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD) |
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* @retval HAL status |
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*/ |
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HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode) |
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{ |
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/* Check the parameters */ |
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assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode)); |
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/* Change CRC peripheral state */ |
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hcrc->State = HAL_CRC_STATE_BUSY; |
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/* set output data inversion mode */ |
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode); |
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/* Change CRC peripheral state */ |
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hcrc->State = HAL_CRC_STATE_READY; |
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/* Return function status */ |
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return HAL_OK; |
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} |
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#if defined (STM32F071xB) || defined (STM32F072xB) || defined (STM32F078xx) || defined (STM32F091xC) || defined (STM32F098xx) |
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/** |
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* @brief Initializes the CRC polynomial if different from default one. |
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* @param hcrc CRC handle |
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* @param Pol CRC generating polynomial (7, 8, 16 or 32-bit long) |
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* This parameter is written in normal representation, e.g. |
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* for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 |
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* for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021 |
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* @param PolyLength CRC polynomial length |
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* This parameter can be one of the following values: |
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* @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7) |
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* @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8) |
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* @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16) |
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* @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32) |
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* @retval HAL status |
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*/ |
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HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength) |
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{ |
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uint32_t msb = 31U; /* polynomial degree is 32 at most, so msb is initialized to max value */ |
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/* Check the parameters */ |
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assert_param(IS_CRC_POL_LENGTH(PolyLength)); |
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/* check polynomial definition vs polynomial size: |
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* polynomial length must be aligned with polynomial |
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* definition. HAL_ERROR is reported if Pol degree is |
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* larger than that indicated by PolyLength. |
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* Look for MSB position: msb will contain the degree of |
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* the second to the largest polynomial member. E.g., for |
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* X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */ |
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while (((Pol & (1U << msb)) == 0U) && (msb-- > 0U)) |
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{} |
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switch (PolyLength) |
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{ |
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case CRC_POLYLENGTH_7B: |
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if (msb >= HAL_CRC_LENGTH_7B) |
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{ |
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return HAL_ERROR; |
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} |
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break; |
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case CRC_POLYLENGTH_8B: |
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if (msb >= HAL_CRC_LENGTH_8B) |
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{ |
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return HAL_ERROR; |
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} |
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break; |
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case CRC_POLYLENGTH_16B: |
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if (msb >= HAL_CRC_LENGTH_16B) |
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{ |
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return HAL_ERROR; |
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} |
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break; |
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case CRC_POLYLENGTH_32B: |
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/* no polynomial definition vs. polynomial length issue possible */ |
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break; |
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default: |
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break; |
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} |
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/* set generating polynomial */ |
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WRITE_REG(hcrc->Instance->POL, Pol); |
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/* set generating polynomial size */ |
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength); |
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/* Return function status */ |
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return HAL_OK; |
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} |
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#endif /* #if defined (STM32F071xB) || defined (STM32F072xB) || defined (STM32F078xx) || defined (STM32F091xC) || defined (STM32F098xx) */ |
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/** |
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* @} |
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*/ |
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/** |
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* @} |
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*/ |
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#endif /* HAL_CRC_MODULE_ENABLED */ |
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/** |
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* @} |
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*/ |
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/** |
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* @} |
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*/ |
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |