#define PRESET_VALUE 0xFFFF
#define POLYNOMIAL  0x8408
unsigned int uiCrc16Cal(unsigned char const  * pucY, unsigned char ucX)
{
	unsigned char ucI,ucJ;
	unsigned short int  uiCrcValue = PRESET_VALUE;

   	for(ucI = 0; ucI < ucX; ucI++)
	   {
		   uiCrcValue = uiCrcValue ^ *(pucY + ucI);
	  	   for(ucJ = 0; ucJ < 8; ucJ++)
	   	  {
		 	if(uiCrcValue & 0x0001)
		   	{
		    	uiCrcValue = (uiCrcValue >> 1) ^ POLYNOMIAL;
		   	}
		 	else
		   	{
		    	uiCrcValue = (uiCrcValue >> 1);
		   	}
		}
 	}
return uiCrcValue;
}