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/**
*******************************************************************************
* @file hc32f4a0_crc.c
* @brief This file provides firmware functions to manage the Cyclic Redundancy
* Check(CRC).
@verbatim
Change Logs:
Date Author Notes
2020-06-12 Heqb First version
2020-07-21 Heqb Fixed a bug for CRC_Check function
2020-08-11 Heqb Modify macro definition name IS_CRC_PROCOTOL
to IS_CRC_PROTOCOL
@endverbatim
*******************************************************************************
* Copyright (C) 2020, Huada Semiconductor Co., Ltd. All rights reserved.
*
* This software component is licensed by HDSC under BSD 3-Clause license
* (the "License"); You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
*******************************************************************************
*/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f4a0_crc.h"
#include "hc32f4a0_utility.h"
/**
* @addtogroup HC32F4A0_DDL_Driver
* @{
*/
/**
* @defgroup DDL_CRC CRC
* @brief Cyclic Redundancy Check Driver Library
* @{
*/
#if (DDL_CRC_ENABLE == DDL_ON)
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/**
* @defgroup CRC_Local_Macros CRC Local Macros
* @{
*/
/**
* @defgroup CRC_Check_Parameters_Validity CRC check parameters validity
* @{
*/
#define IS_CRC_PROTOCOL(x) \
( ((x) == CRC_CRC16) || \
((x) == CRC_CRC32))
#define IS_CRC_BIT_WIDTH(x) \
( ((x) == CRC_BW_8) || \
((x) == CRC_BW_16) || \
((x) == CRC_BW_32))
/**
* @}
*/
/**
* @}
*/
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
/**
* @defgroup CRC_Local_Functions CRC Local Functions
* @{
*/
static void CRC_8BitWrite(const uint8_t au8Data[], uint32_t u32Length);
static void CRC_16BitWrite(const uint16_t au16Data[], uint32_t u32Length);
static void CRC_32BitWrite(const uint32_t au32Data[], uint32_t u32Length);
/**
* @}
*/
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
* @defgroup CRC_Global_Functions CRC Global Functions
* @{
*/
/**
* @brief CRC16 calculation.
* @param [in] u32CrcProtocol CRC protocol control bit.
* This parameter can be a value of @ref CRC_Protocol_Control_Bit
* @param [in] pvData Pointer to the buffer containing the data to be computed.
* @param [in] u32InitVal Initialize the CRC calculation.
* @param [in] u32Length The length(countted in bytes or half word or word, depending on
* the bit width) of the data to be computed.
* @param [in] u8BitWidth Bit width of the data.
* @arg CRC_BW_8: 8 Bit.
* @arg CRC_BW_16: 16 Bit.
* @arg CRC_BW_32: 32 Bit.
* @retval CRC checksum.
*/
uint32_t CRC_Calculate(uint32_t u32CrcProtocol,
const void *pvData,
uint32_t u32InitVal,
uint32_t u32Length,
uint8_t u8BitWidth)
{
uint32_t u32CheckSum = 0UL;
if ((pvData != NULL) && (u32Length != 0U))
{
DDL_ASSERT(IS_CRC_PROTOCOL(u32CrcProtocol));
DDL_ASSERT(IS_CRC_BIT_WIDTH(u8BitWidth));
/* Set operation mode (CRC16 or CRC32) */
WRITE_REG32(M4_CRC->CR, u32CrcProtocol);
/* Set initial value */
if (u32CrcProtocol == CRC_CRC32)
{
WRITE_REG32(M4_CRC->RESLT, u32InitVal);
}
else
{
WRITE_REG16(M4_CRC->RESLT, u32InitVal);
}
/* Write data */
if (u8BitWidth == CRC_BW_8)
{
CRC_8BitWrite(pvData, u32Length);
}
else if (u8BitWidth == CRC_BW_16)
{
CRC_16BitWrite(pvData, u32Length);
}
else
{
CRC_32BitWrite(pvData, u32Length);
}
/* Get checksum */
if (u32CrcProtocol == CRC_CRC32)
{
u32CheckSum = READ_REG32(M4_CRC->RESLT);
}
else
{
u32CheckSum = READ_REG16(M4_CRC->RESLT);
}
}
return u32CheckSum;
}
/**
* @brief CRC check.
* @param [in] u32CrcProtocol CRC protocol control bit.
* This parameter can be a value of @ref CRC_Protocol_Control_Bit
* @param [in] u32CheckSum The checksum of the data pointed by pointer pvData.
* @param [in] pvData Pointer to the buffer containing the data to be checked.
* @param [in] u32InitVal Initialize the CRC calculation.
* @param [in] u32Length The length(countted in bytes or half word or word, depending on
* the bit width) of the data to be computed.
* @param [in] u8BitWidth Bit width of the data.
* @arg CRC_BW_8: 8 Bit.
* @arg CRC_BW_16: 16 Bit.
* @arg CRC_BW_32: 32 Bit.
* @retval A en_flag_status_t value.
* @arg Set: CRC checks successfully.
* @arg Reset: CRC checks unsuccessfully.
*/
en_flag_status_t CRC_Check(uint32_t u32CrcProtocol,
uint32_t u32CheckSum,
const void *pvData,
uint32_t u32InitVal,
uint32_t u32Length,
uint8_t u8BitWidth)
{
en_flag_status_t enFlag = Reset;
uint32_t u32DataAddr = (uint32_t)&M4_CRC->DAT0;
DDL_ASSERT(IS_CRC_PROTOCOL(u32CrcProtocol));
DDL_ASSERT(IS_CRC_BIT_WIDTH(u8BitWidth));
if ((pvData != NULL) && (u32Length != 0UL))
{
/* Set operation mode (CRC16 or CRC32) */
WRITE_REG32(M4_CRC->CR, u32CrcProtocol);
/* Set initial value */
if (u32CrcProtocol == CRC_CRC32)
{
WRITE_REG32(M4_CRC->RESLT, u32InitVal);
}
else
{
WRITE_REG16(M4_CRC->RESLT, u32InitVal);
}
/* Write data */
if (u8BitWidth == CRC_BW_8)
{
CRC_8BitWrite(pvData, u32Length);
}
else if (u8BitWidth == CRC_BW_16)
{
CRC_16BitWrite(pvData, u32Length);
}
else
{
CRC_32BitWrite(pvData, u32Length);
}
/* Write checksum */
if (u32CrcProtocol == CRC_CRC32)
{
RW_MEM32(u32DataAddr) = u32CheckSum;
}
else
{
RW_MEM16(u32DataAddr) = (uint16_t)u32CheckSum;
}
/* Get flag */
if (READ_REG32_BIT(M4_CRC->CR, CRC_CR_FLAG) != 0UL)
{
enFlag = Set;
}
}
return enFlag;
}
/**
* @}
*/
/**
* @addtogroup CRC_Local_Functions CRC Local Functions
* @{
*/
/**
* @brief Write CRC data register in bytes.
* @param [in] au8Data The buffer for writing.
* @param [in] u32Length The length of data the in bytes.
* @retval None
*/
static void CRC_8BitWrite(const uint8_t au8Data[], uint32_t u32Length)
{
uint32_t i;
const uint32_t u32DataAddr = (uint32_t)(&M4_CRC->DAT0);
for (i = 0UL; i < u32Length; i++)
{
RW_MEM8(u32DataAddr) = au8Data[i];
}
}
/**
* @brief Write CRC data register in half words.
* @param [in] au16Data The buffer for writing.
* @param [in] u32Length The length of the data in half words.
* @retval None
*/
static void CRC_16BitWrite(const uint16_t au16Data[], uint32_t u32Length)
{
uint32_t i;
const uint32_t u32DataAddr = (uint32_t)(&M4_CRC->DAT0);
for (i = 0UL; i < u32Length; i++)
{
RW_MEM16(u32DataAddr) = au16Data[i];
}
}
/**
* @brief Write CRC data register in words.
* @param [in] au32Data The buffer for writing.
* @param [in] u32Length The length of the data in words.
* @retval None
*/
static void CRC_32BitWrite(const uint32_t au32Data[], uint32_t u32Length)
{
uint32_t i;
const uint32_t u32DataAddr = (uint32_t)(&M4_CRC->DAT0);
for (i = 0UL; i < u32Length; i++)
{
RW_MEM32(u32DataAddr) = au32Data[i];
}
}
/**
* @}
*/
#endif /* DDL_CRC_ENABLE */
/**
* @}
*/
/**
* @}
*/
/******************************************************************************
* EOF (not truncated)
*****************************************************************************/
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