mirror of https://github.com/ARMmbed/mbed-os.git
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/**************************************************************************//**
|
|
* @file crc.c
|
|
* @version V1.00
|
|
* $Revision: 3 $
|
|
* $Date: 14/09/29 3:50p $
|
|
* @brief Nano100 series CRC driver source file
|
|
*
|
|
* @note
|
|
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
|
|
*****************************************************************************/
|
|
#include "Nano100Series.h"
|
|
|
|
|
|
|
|
/** @addtogroup NANO100_Device_Driver NANO100 Device Driver
|
|
@{
|
|
*/
|
|
|
|
/** @addtogroup NANO100_CRC_Driver CRC Driver
|
|
@{
|
|
*/
|
|
|
|
|
|
/** @addtogroup NANO100_CRC_EXPORTED_FUNCTIONS CRC Exported Functions
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
* @brief CRC Open
|
|
*
|
|
* @param[in] u32Mode CRC Polynomial Mode \ref CRC_CCITT, \ref CRC_8, \ref CRC_16, \ref CRC_32
|
|
* @param[in] u32Attribute Parameter attribute \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 \ref CRC_CPU_WDATA_8, \ref CRC_CPU_WDATA_16, \ref CRC_CPU_WDATA_32
|
|
*
|
|
* @return None
|
|
*
|
|
* @details This function enable the CRC channel.
|
|
*/
|
|
void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
|
|
{
|
|
PDMAGCR->GCRCSR |= DMA_GCR_GCRCSR_CRC_CLK_EN_Msk;
|
|
PDMACRC->SEED = u32Seed;
|
|
PDMACRC->CTL = u32Mode | u32Attribute | u32DataLen | DMA_CRC_CTL_CRCCEN_Msk;
|
|
/* When operated in CPU PIO mode, setting RST bit will reload the initial seed value (CRC_SEED register) */
|
|
PDMACRC->CTL |= DMA_CRC_CTL_CRC_RST_Msk;
|
|
}
|
|
|
|
/**
|
|
* @brief CRC Start DMA transfer
|
|
*
|
|
* @param[in] u32SrcAddr Source address
|
|
* @param[in] u32ByteCount Calculate byte count
|
|
*
|
|
* @return None
|
|
*
|
|
* @details This function start DMA transfer.
|
|
*/
|
|
void CRC_StartDMATransfer(uint32_t u32SrcAddr, uint32_t u32ByteCount)
|
|
{
|
|
PDMACRC->DMASAR = u32SrcAddr;
|
|
PDMACRC->DMABCR = u32ByteCount;
|
|
PDMACRC->CTL |= DMA_CRC_CTL_TRIG_EN_Msk;
|
|
}
|
|
|
|
/**
|
|
* @brief Get CRC Checksum
|
|
*
|
|
* @param[in] None
|
|
*
|
|
* @return Checksum
|
|
*
|
|
* @details This macro get the CRC checksum
|
|
*/
|
|
uint32_t CRC_GetChecksum(void)
|
|
{
|
|
switch (PDMACRC->CTL & DMA_CRC_CTL_CRC_MODE_Msk) {
|
|
case CRC_CCITT:
|
|
case CRC_16:
|
|
return (PDMACRC->CHECKSUM & 0xffff);
|
|
|
|
case CRC_32:
|
|
return (PDMACRC->CHECKSUM);
|
|
|
|
case CRC_8:
|
|
return (PDMACRC->CHECKSUM & 0xff);
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
/*@}*/ /* end of group NANO100_CRC_EXPORTED_FUNCTIONS */
|
|
|
|
/*@}*/ /* end of group NANO100_CRC_Driver */
|
|
|
|
/*@}*/ /* end of group NANO100_Device_Driver */
|
|
|
|
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
|