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332 lines
9.6 KiB
332 lines
9.6 KiB
/**
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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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* @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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(+) Enable CRC AHB clock using __HAL_RCC_CRC_CLK_ENABLE();
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(+) Initialize CRC calculator
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(++) specify generating polynomial (peripheral default or non-default one)
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(++) specify initialization value (peripheral default or non-default one)
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(++) specify input data format
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(++) specify input or output data inversion mode if any
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(+) Use HAL_CRC_Accumulate() function to compute the CRC value of the
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input data buffer starting with the previously computed CRC as
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initialization value
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(+) Use HAL_CRC_Calculate() function to compute the CRC value of the
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input data buffer starting with the defined initialization value
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(default or non-default) to initiate CRC calculation
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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.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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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/** @defgroup CRC CRC
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* @brief CRC 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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/* Exported functions --------------------------------------------------------*/
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/** @defgroup CRC_Exported_Functions CRC Exported Functions
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* @{
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*/
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/** @defgroup CRC_Exported_Functions_Group1 Initialization and de-initialization functions
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* @brief Initialization and Configuration 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 (MCU Specific Package)
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(+) DeInitialize the CRC MSP
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@endverbatim
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* @{
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*/
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/**
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* @brief Initialize the CRC according to the specified
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* parameters in the CRC_InitTypeDef and create the associated handle.
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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_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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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 DeInitialize the CRC peripheral.
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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_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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/* Check the CRC peripheral state */
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if (hcrc->State == HAL_CRC_STATE_BUSY)
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{
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return HAL_BUSY;
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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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/* Reset CRC calculation unit */
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__HAL_CRC_DR_RESET(hcrc);
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/* Reset IDR register content */
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CLEAR_BIT(hcrc->Instance->IDR, CRC_IDR_IDR);
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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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/* Process unlocked */
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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 CRC handle
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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 can be implemented in the user file
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*/
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}
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/**
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* @brief DeInitialize the CRC MSP.
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* @param hcrc CRC handle
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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 can 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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/** @defgroup CRC_Exported_Functions_Group2 Peripheral Control functions
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* @brief management 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 a 32-bit data buffer
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using combination of the previous CRC value and the new one.
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[..] or
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(+) compute the 32-bit CRC value of a 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 Compute the 32-bit CRC value of a 32-bit data buffer
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* starting with the previously computed CRC as initialization value.
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* @param hcrc CRC handle
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* @param pBuffer pointer to the input data buffer.
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* @param BufferLength input data buffer length (number of uint32_t words).
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* @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)
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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; /* CRC input data buffer index */
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uint32_t temp = 0U; /* CRC output (read from hcrc->Instance->DR register) */
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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 = 0U; index < BufferLength; index++)
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{
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hcrc->Instance->DR = pBuffer[index];
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}
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temp = hcrc->Instance->DR;
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_READY;
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/* Return the CRC computed value */
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return temp;
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}
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/**
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* @brief Compute the 32-bit CRC value of a 32-bit data buffer
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* starting with hcrc->Instance->INIT as initialization value.
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* @param hcrc CRC handle
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* @param pBuffer pointer to the input data buffer.
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* @param BufferLength input data buffer length (number of uint32_t words).
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* @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)
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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; /* CRC input data buffer index */
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uint32_t temp = 0U; /* CRC output (read from hcrc->Instance->DR register) */
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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 (hcrc->Instance->INIT is
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* written in hcrc->Instance->DR) */
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__HAL_CRC_DR_RESET(hcrc);
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/* Enter 32-bit input data to the CRC calculator */
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for (index = 0U; index < BufferLength; index++)
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{
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hcrc->Instance->DR = pBuffer[index];
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}
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temp = hcrc->Instance->DR;
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/* Change CRC peripheral state */
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hcrc->State = HAL_CRC_STATE_READY;
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/* Return the CRC computed value */
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return temp;
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}
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/**
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* @}
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*/
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/** @defgroup CRC_Exported_Functions_Group3 Peripheral State functions
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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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@endverbatim
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* @{
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*/
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/**
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* @brief Return the CRC handle state.
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* @param hcrc CRC handle
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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 CRC handle state */
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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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