ref: 01af5a89b3e1ac5c45472ef8ade9c15ffbd19925
dir: /demos/stm32f429_disco/stm/stm32f4_spl/src/stm32f4xx_hal_crc.c/
/**
******************************************************************************
* @file stm32f4xx_hal_crc.c
* @author MCD Application Team
* @version V1.0.0
* @date 18-February-2014
* @brief CRC HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of the Cyclic Redundancy Check (CRC) peripheral:
* + Initialization and de-initialization functions
* + Peripheral Control functions
* + Peripheral State functions
*
@verbatim
==============================================================================
##### How to use this driver #####
==============================================================================
[..]
The CRC HAL driver can be used as follows:
(#) Enable CRC AHB clock using __CRC_CLK_ENABLE();
(#) Use HAL_CRC_Accumulate() function to compute the CRC value of
a 32-bit data buffer using combination of the previous CRC value
and the new one.
(#) Use HAL_CRC_Calculate() function to compute the CRC Value of
a new 32-bit data buffer. This function resets the CRC computation
unit before starting the computation to avoid getting wrong CRC values.
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
/** @addtogroup STM32F4xx_HAL_Driver
* @{
*/
/** @defgroup CRC
* @brief CRC HAL module driver.
* @{
*/
#ifdef HAL_CRC_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup CRC_Private_Functions
* @{
*/
/** @defgroup CRC_Group1 Initialization and de-initialization functions
* @brief Initialization and Configuration functions.
*
@verbatim
==============================================================================
##### Initialization and de-initialization functions #####
==============================================================================
[..] This section provides functions allowing to:
(+) Initialize the CRC according to the specified parameters
in the CRC_InitTypeDef and create the associated handle
(+) DeInitialize the CRC peripheral
(+) Initialize the CRC MSP
(+) DeInitialize CRC MSP
@endverbatim
* @{
*/
/**
* @brief Initializes the CRC according to the specified
* parameters in the CRC_InitTypeDef and creates the associated handle.
* @param hcrc: CRC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRC_Init(CRC_HandleTypeDef *hcrc)
{
/* Check the CRC handle allocation */
if(hcrc == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
if(hcrc->State == HAL_CRC_STATE_RESET)
{
/* Init the low level hardware */
HAL_CRC_MspInit(hcrc);
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Return function status */
return HAL_OK;
}
/**
* @brief DeInitializes the CRC peripheral.
* @param hcrc: CRC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc)
{
/* Check the CRC handle allocation */
if(hcrc == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* DeInit the low level hardware */
HAL_CRC_MspDeInit(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_RESET;
/* Release Lock */
__HAL_UNLOCK(hcrc);
/* Return function status */
return HAL_OK;
}
/**
* @brief Initializes the CRC MSP.
* @param hcrc: CRC handle
* @retval None
*/
__weak void HAL_CRC_MspInit(CRC_HandleTypeDef *hcrc)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_CRC_MspInit could be implemented in the user file
*/
}
/**
* @brief DeInitializes the CRC MSP.
* @param hcrc: CRC handle
* @retval None
*/
__weak void HAL_CRC_MspDeInit(CRC_HandleTypeDef *hcrc)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_CRC_MspDeInit could be implemented in the user file
*/
}
/**
* @}
*/
/** @defgroup CRC_Group2 Peripheral Control functions
* @brief management functions.
*
@verbatim
==============================================================================
##### Peripheral Control functions #####
==============================================================================
[..] This section provides functions allowing to:
(+) Compute the 32-bit CRC value of 32-bit data buffer,
using combination of the previous CRC value and the new one.
(+) Compute the 32-bit CRC value of 32-bit data buffer,
independently of the previous CRC value.
@endverbatim
* @{
*/
/**
* @brief Computes the 32-bit CRC of 32-bit data buffer using combination
* of the previous CRC value and the new one.
* @param hcrc: CRC handle
* @param pBuffer: pointer to the buffer containing the data to be computed
* @param BufferLength: length of the buffer to be computed
* @retval 32-bit CRC
*/
uint32_t HAL_CRC_Accumulate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
{
uint32_t index = 0;
/* Process Locked */
__HAL_LOCK(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Enter Data to the CRC calculator */
for(index = 0; index < BufferLength; index++)
{
hcrc->Instance->DR = pBuffer[index];
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(hcrc);
/* Return the CRC computed value */
return hcrc->Instance->DR;
}
/**
* @brief Computes the 32-bit CRC of 32-bit data buffer independently
* of the previous CRC value.
* @param hcrc: CRC handle
* @param pBuffer: Pointer to the buffer containing the data to be computed
* @param BufferLength: Length of the buffer to be computed
* @retval 32-bit CRC
*/
uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
{
uint32_t index = 0;
/* Process Locked */
__HAL_LOCK(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Reset CRC Calculation Unit */
__HAL_CRC_DR_RESET(hcrc);
/* Enter Data to the CRC calculator */
for(index = 0; index < BufferLength; index++)
{
hcrc->Instance->DR = pBuffer[index];
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(hcrc);
/* Return the CRC computed value */
return hcrc->Instance->DR;
}
/**
* @}
*/
/** @defgroup CRC_Group3 Peripheral State functions
* @brief Peripheral State functions.
*
@verbatim
==============================================================================
##### Peripheral State functions #####
==============================================================================
[..]
This subsection permits to get in run-time the status of the peripheral
and the data flow.
@endverbatim
* @{
*/
/**
* @brief Returns the CRC state.
* @param hcrc: CRC handle
* @retval HAL state
*/
HAL_CRC_StateTypeDef HAL_CRC_GetState(CRC_HandleTypeDef *hcrc)
{
return hcrc->State;
}
/**
* @}
*/
/**
* @}
*/
#endif /* HAL_CRC_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/