#include "CrcUtil.h"


uint16 usMBCRC16(uint8 * pucFrame, uint8 usLen)
{
	uint8 ucCRCHi = 0xFF;
	uint8 ucCRCLo = 0xFF;
	int iIndex;
	while (usLen--)
	{
		iIndex = ucCRCLo ^ *(pucFrame++);
		ucCRCLo = (uint8)(ucCRCHi ^ aucCRCHi[iIndex]);
		ucCRCHi = aucCRCLo[iIndex];
	}
	return (uint16)(ucCRCHi << 8 | ucCRCLo);
}


uint16 CRC16(uint8 *ptr, uint8 len)
{
	uint8 i;
	uint16 crc = 0;
	while (len-- != 0)
	{
		for (i = 0x80; i != 0; i /= 2)
		{
			if ((crc & 0x8000) != 0)
			{
				crc *= 2; crc ^= 0x8005;
			}
			else
				crc *= 2;
			if ((*ptr&i) != 0)
				crc ^= 0x8005;
		}
		ptr++;
	}
	return(crc);
}


/*
CRC16¼ÆË㺯Êý
*/
uint16 MB_CRC16(uint8 Buff[], int count)
{
	uint8 CRCHi = 0xFF;
	uint8 CRCLo = 0xFF;
	int index;
	int i = 0;
	while ((count--) > 0)
	{
		index = CRCLo ^ Buff[i++];
		CRCLo = (uint8)(CRCHi ^ _CRCHi[index]);
		CRCHi = _CRCLo[index];
	}
	return (uint16)(CRCHi << 8 | CRCLo);
}