100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/**************************************************************************//**
|
|
* @file crc.c
|
|
* @version V3.00
|
|
* $Revision: 4 $
|
|
* $Date: 18/04/24 3:49p $
|
|
* @brief M031 series Cyclic Redundancy Check(CRC) driver source file
|
|
*
|
|
* @note
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
* Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.
|
|
*****************************************************************************/
|
|
#include "NuMicro.h"
|
|
|
|
|
|
/** @addtogroup Standard_Driver Standard Driver
|
|
@{
|
|
*/
|
|
|
|
/** @addtogroup CRC_Driver CRC Driver
|
|
@{
|
|
*/
|
|
|
|
/** @addtogroup CRC_EXPORTED_FUNCTIONS CRC Exported Functions
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
* @brief CRC Open
|
|
*
|
|
* @param[in] u32Mode CRC operation polynomial mode. Valid values are:
|
|
* - \ref CRC_CCITT
|
|
* - \ref CRC_8
|
|
* - \ref CRC_16
|
|
* - \ref CRC_32
|
|
* @param[in] u32Attribute CRC operation data attribute. Valid values are combined with:
|
|
* - \ref CRC_CHECKSUM_COM
|
|
* - \ref CRC_CHECKSUM_RVS
|
|
* - \ref CRC_WDATA_COM
|
|
* - \ref CRC_WDATA_RVS
|
|
* @param[in] u32Seed Seed value.
|
|
* @param[in] u32DataLen CPU Write Data Length. Valid values are:
|
|
* - \ref CRC_CPU_WDATA_8
|
|
* - \ref CRC_CPU_WDATA_16
|
|
* - \ref CRC_CPU_WDATA_32
|
|
*
|
|
* @return None
|
|
*
|
|
* @details This function will enable the CRC controller by specify CRC operation mode, attribute, initial seed and write data length. \n
|
|
* After that, user can start to perform CRC calculate by calling CRC_WRITE_DATA macro or CRC_DAT register directly.
|
|
*/
|
|
void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
|
|
{
|
|
CRC->SEED = u32Seed;
|
|
CRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk;
|
|
|
|
/* Setting CRCRST bit will reload the initial seed value(CRC_SEED register) to CRC controller */
|
|
CRC->CTL |= CRC_CTL_CHKSINIT_Msk;
|
|
}
|
|
|
|
/**
|
|
* @brief Get CRC Checksum
|
|
*
|
|
* @param[in] None
|
|
*
|
|
* @return Checksum Result
|
|
*
|
|
* @details This macro gets the CRC checksum result by current CRC polynomial mode.
|
|
*/
|
|
uint32_t CRC_GetChecksum(void)
|
|
{
|
|
uint32_t ret;
|
|
|
|
switch(CRC->CTL & CRC_CTL_CRCMODE_Msk)
|
|
{
|
|
case CRC_CCITT:
|
|
case CRC_16:
|
|
ret = (CRC->CHECKSUM & 0xFFFFU);
|
|
break;
|
|
case CRC_32:
|
|
ret = (CRC->CHECKSUM);
|
|
break;
|
|
case CRC_8:
|
|
ret = (CRC->CHECKSUM & 0xFFU);
|
|
break;
|
|
default:
|
|
ret = 0U;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */
|
|
|
|
/*@}*/ /* end of group CRC_Driver */
|
|
|
|
/*@}*/ /* end of group Standard_Driver */
|
|
|
|
/*** (C) COPYRIGHT 2018 Nuvoton Technology Corp. ***/
|