532 lines
17 KiB
C
532 lines
17 KiB
C
/**
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******************************************************************************
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* @file stm32f0xx_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 (IP default or non-default one)
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(++)specify initialization value (IP 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</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 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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/** @defgroup CRC_Private_Functions CRC Private Functions
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* @{
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*/
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static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength);
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static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength);
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/**
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* @}
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*/
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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/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 initialize 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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/* Extended initialization: if programmable polynomial feature is
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applicable to device, set default or non-default generating
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polynomial according to hcrc->Init parameters.
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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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if (HAL_CRCEx_Init(hcrc) != HAL_OK)
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{
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return HAL_ERROR;
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}
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/* check whether or not non-default CRC initial value has been
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* picked up by user */
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assert_param(IS_DEFAULT_INIT_VALUE(hcrc->Init.DefaultInitValueUse));
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if (hcrc->Init.DefaultInitValueUse == DEFAULT_INIT_VALUE_ENABLE)
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{
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WRITE_REG(hcrc->Instance->INIT, DEFAULT_CRC_INITVALUE);
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}
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else
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{
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WRITE_REG(hcrc->Instance->INIT, hcrc->Init.InitValue);
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}
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/* set input data inversion mode */
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assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(hcrc->Init.InputDataInversionMode));
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, hcrc->Init.InputDataInversionMode);
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/* set output data inversion mode */
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assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(hcrc->Init.OutputDataInversionMode));
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MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, hcrc->Init.OutputDataInversionMode);
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/* makes sure the input data format (bytes, halfwords or words stream)
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* is properly specified by user */
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assert_param(IS_CRC_INPUTDATA_FORMAT(hcrc->InputDataFormat));
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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 7U, 8U, 16 or 32-bit CRC value of an 8U, 16 or 32-bit data buffer
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using the combination of the previous CRC value and the new one
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[..] or
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(+) compute the 7U, 8U, 16 or 32-bit CRC value of an 8U, 16 or 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 7, 8, 16 or 32-bit CRC value of an 8, 16 or 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, exact input data format is
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* provided by hcrc->InputDataFormat.
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* @param BufferLength input data buffer length (number of bytes if pBuffer
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* type is * uint8_t, number of half-words if pBuffer type is * uint16_t,
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* number of words if pBuffer type is * uint32_t).
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* @note By default, the API expects a uint32_t pointer as input buffer parameter.
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* Input buffer pointers with other types simply need to be cast in uint32_t
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* and the API will internally adjust its input data processing based on the
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* handle field hcrc->InputDataFormat.
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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 = 0U; /* 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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/* 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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switch (hcrc->InputDataFormat)
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{
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case CRC_INPUTDATA_FORMAT_WORDS:
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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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break;
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case CRC_INPUTDATA_FORMAT_BYTES:
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temp = CRC_Handle_8(hcrc, (uint8_t*)pBuffer, BufferLength);
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break;
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case CRC_INPUTDATA_FORMAT_HALFWORDS:
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temp = CRC_Handle_16(hcrc, (uint16_t*)pBuffer, BufferLength);
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break;
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default:
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break;
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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 temp;
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}
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/**
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* @brief Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 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, exact input data format is
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* provided by hcrc->InputDataFormat.
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* @param BufferLength input data buffer length (number of bytes if pBuffer
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* type is * uint8_t, number of half-words if pBuffer type is * uint16_t,
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* number of words if pBuffer type is * uint32_t).
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* @note By default, the API expects a uint32_t pointer as input buffer parameter.
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* Input buffer pointers with other types simply need to be cast in uint32_t
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* and the API will internally adjust its input data processing based on the
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* handle field hcrc->InputDataFormat.
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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 = 0U; /* 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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/* 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 (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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switch (hcrc->InputDataFormat)
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{
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case CRC_INPUTDATA_FORMAT_WORDS:
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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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break;
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case CRC_INPUTDATA_FORMAT_BYTES:
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/* Specific 8-bit input data handling */
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temp = CRC_Handle_8(hcrc, (uint8_t*)pBuffer, BufferLength);
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break;
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case CRC_INPUTDATA_FORMAT_HALFWORDS:
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/* Specific 16-bit input data handling */
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temp = CRC_Handle_16(hcrc, (uint16_t*)pBuffer, BufferLength);
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break;
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default:
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break;
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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 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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/** @defgroup CRC_Private_Functions CRC Private Functions
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* @{
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*/
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/**
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* @brief Enter 8-bit input data to the CRC calculator.
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* Specific data handling to optimize processing time.
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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
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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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static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength)
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{
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uint32_t i = 0U; /* input data buffer index */
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/* Processing time optimization: 4 bytes are entered in a row with a single word write,
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* last bytes must be carefully fed to the CRC calculator to ensure a correct type
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* handling by the IP */
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for(i = 0U; i < (BufferLength/4U); i++)
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{
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hcrc->Instance->DR = ((uint32_t)pBuffer[4U*i]<<24U) | ((uint32_t)pBuffer[4U*i+1]<<16U) | ((uint32_t)pBuffer[4U*i+2]<<8U) | (uint32_t)pBuffer[4U*i+3];
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}
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/* last bytes specific handling */
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if ((BufferLength%4U) != 0U)
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{
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if (BufferLength%4U == 1U)
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{
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*(uint8_t volatile*) (&hcrc->Instance->DR) = pBuffer[4*i];
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}
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if (BufferLength%4U == 2U)
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{
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*(uint16_t volatile*) (&hcrc->Instance->DR) = ((uint32_t)pBuffer[4*i]<<8) | (uint32_t)pBuffer[4*i+1];
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}
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if (BufferLength%4U == 3U)
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{
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*(uint16_t volatile*) (&hcrc->Instance->DR) = ((uint32_t)pBuffer[4*i]<<8) | (uint32_t)pBuffer[4*i+1];
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*(uint8_t volatile*) (&hcrc->Instance->DR) = pBuffer[4*i+2];
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}
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}
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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 Enter 16-bit input data to the CRC calculator.
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* Specific data handling to optimize processing time.
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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
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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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static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength)
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{
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uint32_t i = 0U; /* input data buffer index */
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/* Processing time optimization: 2 HalfWords are entered in a row with a single word write,
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* in case of odd length, last HalfWord must be carefully fed to the CRC calculator to ensure
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* a correct type handling by the IP */
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for(i = 0U; i < (BufferLength/2U); i++)
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{
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hcrc->Instance->DR = ((uint32_t)pBuffer[2U*i]<<16U) | (uint32_t)pBuffer[2U*i+1];
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}
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if ((BufferLength%2U) != 0U)
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{
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*(uint16_t volatile*) (&hcrc->Instance->DR) = pBuffer[2*i];
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}
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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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#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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