INT16U cal_crc_half(INT8U far *pin, INT8U len)
{
INT16U crc;
INT8U da;
INT8U far *ptr;
INT8U bCRCHign;
INT8U bCRCLow;
INT16U crc_ta[16] = { 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef};
ptr=pin;
crc=0;
len--;
while(len--!=0)
{
da=((INT8U)(crc>>8))>>4;
crc<<=4;
crc^=crc_ta[da^(*ptr>>4)];
da=((INT8U)(crc>>8))>>4;
crc<<=4;
crc^=crc_ta[da^(*ptr&0x0f)];
ptr++;
}
bCRCLow = crc;
bCRCHign= (INT8U)(crc>>8);
if(bCRCLow==0x28||bCRCLow==0x0d||bCRCLow==0x0a)
{
bCRCLow++;
}
if(bCRCHign==0x28||bCRCHign==0x0d||bCRCHign==0x0a)
{
bCRCHign++;
}
crc = ((INT16U)bCRCHign)<<8;
crc += bCRCLow;
return(crc);
}