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HALLIB/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c
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346
HALLIB/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c
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/**
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******************************************************************************
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* @file stm32f4xx_hal_crc.c
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* @author MCD Application Team
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* @version V1.4.2
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* @date 10-November-2015
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* @brief CRC HAL module driver.
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* This file provides firmware functions to manage the following
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* functionalities of the Cyclic Redundancy Check (CRC) peripheral:
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* + Initialization and de-initialization functions
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* + Peripheral Control functions
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* + Peripheral State 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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The CRC HAL driver can be used as follows:
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(#) Enable CRC AHB clock using __HAL_RCC_CRC_CLK_ENABLE();
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(#) Use HAL_CRC_Accumulate() function to compute the CRC value of
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a 32-bit data buffer using combination of the previous CRC value
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and the new one.
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(#) Use HAL_CRC_Calculate() function to compute the CRC Value of
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a new 32-bit data buffer. This function resets the CRC computation
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unit before starting the computation to avoid getting wrong CRC values.
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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) 2015 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 "stm32f4xx_hal.h"
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/** @addtogroup STM32F4xx_HAL_Driver
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* @{
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*/
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/** @addtogroup CRC
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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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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup CRC_Exported_Functions
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* @{
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*/
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/** @addtogroup CRC_Exported_Functions_Group1
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* @brief Initialization and de-initialization functions
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*
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@verbatim
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==============================================================================
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##### Initialization and de-initialization functions #####
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==============================================================================
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[..] This section provides functions allowing to:
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(+) Initialize the CRC according to the specified parameters
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in the CRC_InitTypeDef and create the associated handle
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(+) DeInitialize the CRC peripheral
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(+) Initialize the CRC MSP
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(+) DeInitialize CRC MSP
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@endverbatim
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* @{
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*/
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/**
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* @brief Initializes the CRC according to the specified
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* parameters in the CRC_InitTypeDef and creates the associated handle.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_CRC_Init(CRC_HandleTypeDef *hcrc)
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{
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/* Check the CRC handle allocation */
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if(hcrc == NULL)
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{
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return HAL_ERROR;
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}
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/* Check the parameters */
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assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
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if(hcrc->State == HAL_CRC_STATE_RESET)
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{
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/* Allocate lock resource and initialize it */
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hcrc->Lock = HAL_UNLOCKED;
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/* Init the low level hardware */
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HAL_CRC_MspInit(hcrc);
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}
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_BUSY;
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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 DeInitializes the CRC peripheral.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc)
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{
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/* Check the CRC handle allocation */
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if(hcrc == NULL)
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{
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return HAL_ERROR;
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}
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/* Check the parameters */
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assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_BUSY;
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/* DeInit the low level hardware */
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HAL_CRC_MspDeInit(hcrc);
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_RESET;
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/* Release Lock */
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__HAL_UNLOCK(hcrc);
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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 Initializes the CRC MSP.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @retval None
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*/
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__weak void HAL_CRC_MspInit(CRC_HandleTypeDef *hcrc)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hcrc);
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/* NOTE : This function Should not be modified, when the callback is needed,
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the HAL_CRC_MspInit could be implemented in the user file
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*/
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}
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/**
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* @brief DeInitializes the CRC MSP.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @retval None
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*/
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__weak void HAL_CRC_MspDeInit(CRC_HandleTypeDef *hcrc)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hcrc);
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/* NOTE : This function Should not be modified, when the callback is needed,
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the HAL_CRC_MspDeInit could be implemented in the user file
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*/
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}
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/**
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* @}
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*/
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/** @addtogroup CRC_Exported_Functions_Group2
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* @brief Peripheral Control functions
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*
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@verbatim
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==============================================================================
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##### Peripheral Control functions #####
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==============================================================================
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[..] This section provides functions allowing to:
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(+) Compute the 32-bit CRC value of 32-bit data buffer,
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using combination of the previous CRC value and the new one.
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(+) Compute the 32-bit CRC value of 32-bit data buffer,
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independently of the previous CRC value.
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@endverbatim
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* @{
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*/
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/**
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* @brief Computes the 32-bit CRC of 32-bit data buffer using combination
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* of the previous CRC value and the new one.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @param pBuffer: pointer to the buffer containing the data to be computed
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* @param BufferLength: length of the buffer to be computed
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* @retval 32-bit CRC
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*/
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uint32_t HAL_CRC_Accumulate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
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{
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uint32_t index = 0;
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/* Process Locked */
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__HAL_LOCK(hcrc);
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_BUSY;
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/* Enter Data to the CRC calculator */
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for(index = 0; index < BufferLength; index++)
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{
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hcrc->Instance->DR = pBuffer[index];
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}
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_READY;
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/* Process Unlocked */
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__HAL_UNLOCK(hcrc);
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/* Return the CRC computed value */
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return hcrc->Instance->DR;
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}
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/**
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* @brief Computes the 32-bit CRC of 32-bit data buffer independently
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* of the previous CRC value.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @param pBuffer: Pointer to the buffer containing the data to be computed
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* @param BufferLength: Length of the buffer to be computed
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* @retval 32-bit CRC
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*/
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uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
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{
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uint32_t index = 0;
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/* Process Locked */
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__HAL_LOCK(hcrc);
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_BUSY;
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/* Reset CRC Calculation Unit */
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__HAL_CRC_DR_RESET(hcrc);
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/* Enter Data to the CRC calculator */
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for(index = 0; index < BufferLength; index++)
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{
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hcrc->Instance->DR = pBuffer[index];
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}
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_READY;
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/* Process Unlocked */
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__HAL_UNLOCK(hcrc);
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/* Return the CRC computed value */
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return hcrc->Instance->DR;
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}
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/**
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* @}
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*/
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/** @addtogroup CRC_Exported_Functions_Group3
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* @brief Peripheral State functions
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*
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@verbatim
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==============================================================================
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##### Peripheral State functions #####
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==============================================================================
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[..]
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This subsection permits to get in run-time the status of the peripheral
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and the data flow.
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@endverbatim
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* @{
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*/
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/**
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* @brief Returns the CRC state.
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* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
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* the configuration information for CRC
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* @retval HAL state
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*/
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HAL_CRC_StateTypeDef HAL_CRC_GetState(CRC_HandleTypeDef *hcrc)
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{
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return hcrc->State;
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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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*/
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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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