103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/**************************************************************************//**
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* @file crc.c
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* @version V3.00
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* $Revision: 8 $
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* $Date: 15/05/04 3:59p $
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* @brief CRC driver source file
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*
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* @note
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* SPDX-License-Identifier: Apache-2.0
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* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
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*****************************************************************************/
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#include "NUC200Series.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 Polynomial Mode. CRC_CCITT, CRC_8, CRC_16, CRC_32
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* @param[in] u32Attribute Parameter attribute. CRC_CHECKSUM_COM, CRC_CHECKSUM_RVS, CRC_WDATA_COM, CRC_WDATA_RVS
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* @param[in] u32Seed Seed value.
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* @param[in] u32DataLen CPU Write Data Length. CRC_CPU_WDATA_8, CRC_CPU_WDATA_16, 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 enable the CRC channel by specify CRC mode, attribute, initial seed and write data length.
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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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/* Enable CRC channel clock */
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PDMA_GCR->GCRCSR |= PDMA_GCRCSR_CRC_CLK_EN_Msk;
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CRC->SEED = u32Seed;
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CRC->CTL = u32Mode | u32Attribute | u32DataLen | CRC_CTL_CRCCEN_Msk;
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/* Setting RST bit will reload the initial seed value (CRC_SEED register) */
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CRC->CTL |= CRC_CTL_CRC_RST_Msk;
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}
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/**
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* @brief CRC Start DMA transfer
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*
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* @param[in] u32SrcAddr Source address
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* @param[in] u32ByteCount Calculate byte count
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*
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* @return None
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*
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* @details This function start CRC DMA transfer from specify source address and byte counts.
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*/
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void CRC_StartDMATransfer(uint32_t u32SrcAddr, uint32_t u32ByteCount)
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{
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CRC->DMASAR = u32SrcAddr;
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CRC->DMABCR = u32ByteCount;
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CRC->CTL |= CRC_CTL_TRIG_EN_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
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*
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* @details This macro get 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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switch(CRC->CTL & CRC_CTL_CRC_MODE_Msk)
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{
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case CRC_CCITT:
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case CRC_16:
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return (CRC->CHECKSUM & 0xFFFF);
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case CRC_32:
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return (CRC->CHECKSUM);
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case CRC_8:
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return (CRC->CHECKSUM & 0xFF);
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default:
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return 0;
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}
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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 Device_Driver */
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/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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