#include "crc.h"


void Init_CRC_CRC_CCITT(void)
{
	CRC_InitTypeDef init_para;

	CMU_PERCLK_SetableEx(CRCCLK, ENABLE);	
	
	init_para.CRCSEL = CRC_CR_SEL_CRC16;	/*!<CRCУÑé¶àÏîʽѡÔñ*/
	init_para.RFLTIN = CRC_CR_RFLTIN_BYTE;/*!<CRCÊäÈ뷴ת¿ØÖÆ*/
	init_para.RFLTO = CRC_CR_RFLTO_BYTE;		/*!<CRCÊä³ö·´×ª¿ØÖÆ*/
	init_para.XOR = DISABLE;							/*!<Êä³öÒì»òʹÄÜ*/
	init_para.PARA = CRC_CR_PARA_SERIAL;/*!<CRC¿ìËÙ¼ÆËãʹÄÜ*/
	init_para.OPWD = CRC_CR_OPWD_BYTE;		/*!<WORD²Ù×÷ʹÄÜ*/
	init_para.CRCPOLY = 0x1021; 					/*!<CRC¶àÏîʽ¼Ä´æÆ÷*/
	init_para.CRC_XOR = 0x0000;						/*!<ÔËËã½á¹ûÒì»ò¼Ä´æÆ÷*/
	init_para.LFSR = 0x0000;							/*!<³õʼֵ*/
	CRC_Init(&init_para);
}

void Init_CRC_CRC_MODBUS(void)
{
	CRC_InitTypeDef init_para;

  CMU_PERCLK_SetableEx(CRCCLK, ENABLE);	
	
	init_para.CRCSEL = CRC_CR_SEL_CRC16;	/*!<CRCУÑé¶àÏîʽѡÔñ*/
	init_para.RFLTIN = CRC_CR_RFLTIN_BYTE;/*!<CRCÊäÈ뷴ת¿ØÖÆ*/
	init_para.RFLTO = CRC_CR_RFLTO_BYTE;		/*!<CRCÊä³ö·´×ª¿ØÖÆ*/
	init_para.XOR = DISABLE;							/*!<Êä³öÒì»òʹÄÜ*/
	init_para.PARA = CRC_CR_PARA_SERIAL;/*!<CRC¿ìËÙ¼ÆËãʹÄÜ*/
	init_para.OPWD = CRC_CR_OPWD_BYTE;		/*!<WORD²Ù×÷ʹÄÜ*/
	init_para.CRCPOLY = 0x8005; 					/*!<CRC¶àÏîʽ¼Ä´æÆ÷*/
	init_para.CRC_XOR = 0x0000;						/*!<ÔËËã½á¹ûÒì»ò¼Ä´æÆ÷*/
	init_para.LFSR = 0xFFFF;							/*!<³õʼֵ*/
	CRC_Init(&init_para);
}


//CRC-16/CCITT x16+x12+x5+1 0x1021
//Init = 0x0000
//RefIn£¬RefOut
//¼ÆËã½á¹û¸ßµÍ×Ö½Úµ¹ÐòÊä³ö,¸ßλÔÚ×󣬵ÍλÔÚÓÒ¡£
unsigned int CalCRC16_CCITT( uint16 Init, uint08 *DataIn, uint32 Len )
{
	uint32 i;
	uint16 CRC16;

	CRC_LFSR_Write(Init);				//³õÖµ¼Ä´æÆ÷
	
	for( i=0; i<Len; i++ )
	{
		CRC_DR_Write(DataIn[i]);//ÊäÈëÊä³ö¼Ä´æÆ÷
		Do_DelayStart();
		{
			if(RESET == CRC_CR_BUSY_Chk())
			{
				break;
			}
		}While_DelayUsEnd(200);
	}

	CRC16 = CRC_DR_Read() & 0xffff;
	return CRC16;
}


//CRC-16/MODBUS x16+x15+x2+1 0x8005
//Init = 0xFFFF
//RefIn£¬RefOut
//¼ÆËã½á¹û¸ßµÍ×Ö½Úµ¹ÐòÊä³ö
unsigned int CalCRC16_MODBUS( uint16 Init, uint08 *DataIn, uint32 Len )
{
	uint32 i;
	uint16 CRC16;

	CRC_LFSR_Write(Init);				//³õÖµ¼Ä´æÆ÷
	
	for( i=0; i<Len; i++ )
	{
		CRC_DR_Write(DataIn[i]);//ÊäÈëÊä³ö¼Ä´æÆ÷
		Do_DelayStart();
		{
			if(RESET == CRC_CR_BUSY_Chk())
			{
				break;
			}
		}While_DelayUsEnd(200);
	}

	CRC16 = CRC_DR_Read() & 0xffff;
	return CRC16;
}


//Õâ¸öоƬµÄÓ²¼þCRCÐèÒªÕâô²Ù×÷£¬ÎÒÃÇÔ­±¾Ð´µÄÈí¼þCRC²»ÐèÒªµÄ¡£  0xffffºÍ0x0000Õâôת»»Ö®ºó¶¼ÊÇÔ­Öµ¡£
unsigned int BitChange(unsigned int us_DataIn)
{
	unsigned int us_Data = us_DataIn;
	us_Data = ((us_Data & 0xFF00) >> 8) | ((us_Data & 0x00FF) << 8);
	us_Data = ((us_Data & 0xF0F0) >> 4) | ((us_Data & 0x0F0F) << 4);
	us_Data = ((us_Data & 0xCCCC) >> 2) | ((us_Data & 0x3333) << 2);
	us_Data = ((us_Data & 0xAAAA) >> 1) | ((us_Data & 0x5555) << 1);

	return (us_Data);
}