127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/**************************************************************************//**
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* @file crc.c
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* @version V3.00
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* @brief Cyclic Redundancy Check(CRC) driver source file
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*
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* @copyright (C) 2019 Nuvoton Technology Corp. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of Nuvoton Technology Corp. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include "NuMicro.h"
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/** @addtogroup Standard_Driver Standard Driver
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@{
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*/
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/** @addtogroup CRC_Driver CRC Driver
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@{
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*/
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/** @addtogroup CRC_EXPORTED_FUNCTIONS CRC Exported Functions
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@{
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*/
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/**
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* @brief CRC Open
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*
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* @param[in] u32Mode CRC operation polynomial mode. Valid values are:
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* - \ref CRC_CCITT
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* - \ref CRC_8
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* - \ref CRC_16
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* - \ref CRC_32
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* @param[in] u32Attribute CRC operation data attribute. Valid values are combined with:
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* - \ref CRC_CHECKSUM_COM
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* - \ref CRC_CHECKSUM_RVS
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* - \ref CRC_WDATA_COM
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* - \ref CRC_WDATA_RVS
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* @param[in] u32Seed Seed value.
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* @param[in] u32DataLen CPU Write Data Length. Valid values are:
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* - \ref CRC_CPU_WDATA_8
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* - \ref CRC_CPU_WDATA_16
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* - \ref CRC_CPU_WDATA_32
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*
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* @return None
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*
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* @details This function will enable the CRC controller by specify CRC operation mode, attribute, initial seed and write data length. \n
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* After that, user can start to perform CRC calculate by calling CRC_WRITE_DATA macro or CRC_DAT register directly.
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*/
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void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
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{
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CRC_T *pCRC;
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pCRC = CRC;
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pCRC->SEED = u32Seed;
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pCRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCEN_Msk;
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/* Setting CHKSINIT bit will reload the initial seed value(CRC_SEED register) to CRC controller */
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pCRC->CTL |= CRC_CTL_CHKSINIT_Msk;
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}
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/**
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* @brief Get CRC Checksum
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*
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* @param[in] None
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*
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* @return Checksum Result
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*
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* @details This macro gets the CRC checksum result by current CRC polynomial mode.
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*/
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uint32_t CRC_GetChecksum(void)
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{
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CRC_T *pCRC;
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uint32_t u32Checksum = 0UL;
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pCRC = CRC;
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switch(pCRC->CTL & CRC_CTL_CRCMODE_Msk)
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{
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case CRC_CCITT:
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case CRC_16:
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u32Checksum = (pCRC->CHECKSUM & 0xFFFFUL);
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break;
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case CRC_32:
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u32Checksum = pCRC->CHECKSUM;
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break;
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case CRC_8:
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u32Checksum = (pCRC->CHECKSUM & 0xFFUL);
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break;
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default:
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break;
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}
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return u32Checksum;
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}
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/*@}*/ /* end of group CRC_EXPORTED_FUNCTIONS */
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/*@}*/ /* end of group CRC_Driver */
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/*@}*/ /* end of group Standard_Driver */
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/*** (C) COPYRIGHT 2019 Nuvoton Technology Corp. ***/
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