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271 lines
10 KiB
271 lines
10 KiB
7 years ago
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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****/
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