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/*******************************************************************************
* 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
*/
/******************************************************************************/
/** \file hc32f460_crc.c
**
** A detailed description is available at
** @link CrcGroup Crc description @endlink
**
** - 2019-03-07 CDT First version for Device Driver Library of Crc.
**
******************************************************************************/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f460_crc.h"
#include "hc32f460_utility.h"
/**
*******************************************************************************
** \addtogroup CrcGroup
******************************************************************************/
//@{
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/* Definition of CRC16 data register. */
#define M4_CRC16_DAT (*((__IO uint16_t *)&M4_CRC->DAT0))
/* Definition of CRC16 checksum register. */
#define M4_CRC16_RSLT (*((__IO uint16_t *)&M4_CRC->RESLT))
/* Definition of CRC16 initial value register. */
#define M4_CRC16_INIT (M4_CRC16_RSLT)
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
static uint32_t CRC_ProcChecksum(uint32_t u32Checksum);
static uint32_t CRC_ReverseBits(uint32_t u32Data);
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Initialize the CRC.
**
** \param [in] u32Config Bit[1]: CRC_SEL_16B or CRC_SEL_32B.
** Bit[2]: CRC_REFIN_DISABLE or CRC_REFIN_ENABLE.
** Bit[3]: CRC_REFOUT_DISABLE or CRC_REFOUT_ENABLE.
** Bit[4]: CRC_XOROUT_DISABLE or CRC_XOROUT_ENABLE.
** See the definitions for details.
**
** \retval None
**
******************************************************************************/
void CRC_Init(uint32_t u32Config)
{
u32Config &= CRC_CONFIG_MASK;
M4_CRC->CR = u32Config;
}
/**
*******************************************************************************
** \brief CRC16 calculation.
**
** \param [in] u16InitVal Initial value of CRC16.
**
** \param [in] pu16Data Pointer to the buffer containing the data to be computed.
**
** \param [in] u32Length Length of the buffer to be computed.
**
** \retval 16-bit CRC checksum.
**
******************************************************************************/
uint16_t CRC_Calculate16B(uint16_t u16InitVal, const uint16_t *pu16Data, uint32_t u32Length)
{
uint16_t u16Ret = 0u;
uint32_t u32Count;
if (NULL != pu16Data)
{
M4_CRC16_INIT = u16InitVal;
for (u32Count = 0u; u32Count < u32Length; u32Count++)
{
M4_CRC16_DAT = pu16Data[u32Count];
}
u16Ret = M4_CRC16_RSLT;
}
return u16Ret;
}
/**
*******************************************************************************
** \brief CRC32 calculation.
**
** \param [in] u32InitVal Initial value of CRC32.
**
** \param [in] pu32Data Pointer to the buffer containing the data to be computed.
**
** \param [in] u32Length Length of the buffer to be computed.
**
** \retval 32-bit CRC checksum.
**
******************************************************************************/
uint32_t CRC_Calculate32B(uint32_t u32InitVal, const uint32_t *pu32Data, uint32_t u32Length)
{
uint32_t u32Ret = 0u;
uint32_t u32Count;
M4_CRC->RESLT = u32InitVal;
if (NULL != pu32Data)
{
for (u32Count = 0u; u32Count < u32Length; u32Count++)
{
M4_CRC->DAT0 = pu32Data[u32Count];
}
u32Ret = M4_CRC->RESLT;
}
return u32Ret;
}
/**
*******************************************************************************
** \brief CRC16 check.
**
** \param [in] u16InitVal Initial value of CRC16.
**
** \param [in] u16Checksum CRC16 checksum of the source data.
**
** \param [in] pu16Data Pointer to the buffer containing the data to be checked.
**
** \param [in] u32Length Length of the buffer to be checked.
**
** \retval true CRC16 checks successfully.
** \retval false CRC16 checks unsuccessfully.
**
******************************************************************************/
bool CRC_Check16B(uint16_t u16InitVal, uint16_t u16Checksum, const uint16_t *pu16Data, uint32_t u32Length)
{
bool bRet = false;
uint32_t u32Count;
uint16_t u16CrcChecksum;
if (NULL != pu16Data)
{
u16CrcChecksum = (uint16_t)CRC_ProcChecksum((uint32_t)u16Checksum);
M4_CRC16_INIT = u16InitVal;
for (u32Count = 0u; u32Count < u32Length; u32Count++)
{
M4_CRC16_DAT = pu16Data[u32Count];
}
M4_CRC16_DAT = u16CrcChecksum;
if (bM4_CRC_RESLT_CRCFLAG_16)
{
bRet = true;
}
}
return bRet;
}
/**
*******************************************************************************
** \brief CRC32 check.
**
** \param [in] u32InitVal Initial value of CRC32.
**
** \param [in] u32Checksum CRC32 checksum of the source data.
**
** \param [in] pu32Data Pointer to the buffer containing the data to be checked.
**
** \param [in] u32Length Length of the buffer to be checked.
**
** \retval true CRC32 checks successfully.
** \retval false CRC32 checks unsuccessfully.
**
******************************************************************************/
bool CRC_Check32B(uint32_t u32InitVal, uint32_t u32Checksum, const uint32_t *pu32Data, uint32_t u32Length)
{
bool bRet = false;
uint32_t u32Count;
uint32_t u32CrcChecksum;
if (NULL != pu32Data)
{
u32CrcChecksum = CRC_ProcChecksum(u32Checksum);
M4_CRC->RESLT = u32InitVal;
for (u32Count = 0u; u32Count < u32Length; u32Count++)
{
M4_CRC->DAT0 = pu32Data[u32Count];
}
M4_CRC->DAT0 = u32CrcChecksum;
if (bM4_CRC_FLG_FLAG)
{
bRet = true;
}
}
return bRet;
}
/*******************************************************************************
* Function implementation - local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Processes the checksum of CRC.
**
** \param [in] u32Checksum The checksum of CRC16 or CRC32.
**
** \retval 32-bit new checksum will be used by CRC checking.
**
******************************************************************************/
static uint32_t CRC_ProcChecksum(uint32_t u32Checksum)
{
uint8_t i;
uint8_t u8Size = 16u;
uint8_t u8Offset;
uint32_t u32Config;
uint32_t u32FinalChecksum;
uint32_t u32Temp;
u32Config = M4_CRC->CR;
u32FinalChecksum = u32Checksum;
if ((u32Config & CRC_SEL_32B) == CRC_SEL_32B)
{
u8Size = 32u;
}
if ((u32Config & CRC_REFOUT_ENABLE) == CRC_REFOUT_DISABLE)
{
/* Bits reversing. */
u32FinalChecksum = CRC_ReverseBits(u32Checksum);
if (u8Size == 16u)
{
u32FinalChecksum >>= 16u;
u32FinalChecksum &= 0xFFFFu;
}
}
if ((u32Config & CRC_XOROUT_ENABLE) == CRC_XOROUT_DISABLE)
{
/* Bits NOT. */
u32FinalChecksum = ~u32FinalChecksum;
}
if ((u32Config & CRC_REFIN_ENABLE) == CRC_REFIN_DISABLE)
{
u8Size /= 8u;
/* Bits reversing in bytes. */
for (i = 0u; i < u8Size; i++)
{
u8Offset = i * 8u;
u32Temp = (u32FinalChecksum >> u8Offset) & 0xFFul;
u32Temp = CRC_ReverseBits(u32Temp);
u32Temp = u32Temp >> (24u - u8Offset);
u32FinalChecksum &= ~((uint32_t)0xFF << u8Offset);
u32FinalChecksum |= u32Temp;
}
}
return u32FinalChecksum;
}
/**
*******************************************************************************
** \brief Reverse bits.
**
** \param [in] u32Data The data to be reversed bits.
**
** \retval 32-bit new data.
**
******************************************************************************/
static uint32_t CRC_ReverseBits(uint32_t u32Data)
{
u32Data = (((u32Data & 0xAAAAAAAAul) >> 1u) | ((u32Data & 0x55555555ul) << 1u));
u32Data = (((u32Data & 0xCCCCCCCCul) >> 2u) | ((u32Data & 0x33333333ul) << 2u));
u32Data = (((u32Data & 0xF0F0F0F0ul) >> 4u) | ((u32Data & 0x0F0F0F0Ful) << 4u));
u32Data = (((u32Data & 0xFF00FF00ul) >> 8u) | ((u32Data & 0x00FF00FFul) << 8u));
return ((u32Data >> 16u) | (u32Data << 16u));
}
//@} // CrcGroup
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
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