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/**
******************************************************************************
* @file stm32f7xx_hal_crc_ex.c
* @author MCD Application Team
* @version V1.0.1
* @date 25-June-2015
* @brief Extended CRC HAL module driver.
*
* This file provides firmware functions to manage the following
* functionalities of the CRC peripheral:
* + Initialization/de-initialization functions
*
@verbatim
==============================================================================
##### CRC specific features #####
==============================================================================
[..]
(#) Polynomial configuration.
(#) Input data reverse mode.
(#) Output data reverse mode.
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT(c) 2015 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 "stm32f7xx_hal.h"
/** @addtogroup STM32F7xx_HAL_Driver
* @{
*/
/** @addtogroup CRCEx
* @brief CRC Extended HAL module driver
* @{
*/
#ifdef HAL_CRC_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @addtogroup CRCEx_Exported_Functions
* @{
*/
/** @addtogroup CRCEx_Exported_Functions_Group1
* @brief Extended CRC features functions
*
@verbatim
===============================================================================
##### CRC Extended features functions #####
===============================================================================
[..]
This subsection provides function allowing to:
(+) Set CRC polynomial if different from default one.
@endverbatim
* @{
*/
/**
* @brief Initializes the CRC polynomial if different from default one.
* @param hcrc: CRC handle
* @param Pol: CRC generating polynomial (7, 8, 16 or 32-bit long)
* This parameter is written in normal representation, e.g.
* for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65
* for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021
* @param PolyLength: CRC polynomial length
* This parameter can be one of the following values:
* @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7)
* @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8)
* @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16)
* @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32)
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength)
{
uint32_t msb = 31; /* polynomial degree is 32 at most, so msb is initialized to max value */
/* Check the parameters */
assert_param(IS_CRC_POL_LENGTH(PolyLength));
/* check polynomial definition vs polynomial size:
* polynomial length must be aligned with polynomial
* definition. HAL_ERROR is reported if Pol degree is
* larger than that indicated by PolyLength.
* Look for MSB position: msb will contain the degree of
* the second to the largest polynomial member. E.g., for
* X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */
while (((Pol & ((uint32_t)(0x1) << msb)) == 0) && (msb-- > 0))
{
}
switch (PolyLength)
{
case CRC_POLYLENGTH_7B:
if (msb >= HAL_CRC_LENGTH_7B)
{
return HAL_ERROR;
}
break;
case CRC_POLYLENGTH_8B:
if (msb >= HAL_CRC_LENGTH_8B)
{
return HAL_ERROR;
}
break;
case CRC_POLYLENGTH_16B:
if (msb >= HAL_CRC_LENGTH_16B)
{
return HAL_ERROR;
}
break;
case CRC_POLYLENGTH_32B:
/* no polynomial definition vs. polynomial length issue possible */
break;
default:
break;
}
/* set generating polynomial */
WRITE_REG(hcrc->Instance->POL, Pol);
/* set generating polynomial size */
MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength);
/* Return function status */
return HAL_OK;
}
/**
* @brief Set the Reverse Input data mode.
* @param hcrc: CRC handle
* @param InputReverseMode: Input Data inversion mode
* This parameter can be one of the following values:
* @arg CRC_INPUTDATA_INVERSION_NONE: no change in bit order (default value)
* @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal
* @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal
* @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode)
{
/* Check the parameters */
assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode));
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* set input data inversion mode */
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Return function status */
return HAL_OK;
}
/**
* @brief Set the Reverse Output data mode.
* @param hcrc: CRC handle
* @param OutputReverseMode: Output Data inversion mode
* This parameter can be one of the following values:
* @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value)
* @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD)
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode)
{
/* Check the parameters */
assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode));
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* set output data inversion mode */
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Return function status */
return HAL_OK;
}
/**
* @}
*/
/**
* @}
*/
#endif /* HAL_CRC_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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