MAC
void HexStrToByte(const char *src, unsigned char *dest, int srcLen)
{
short i;
unsigned char highByte, lowByte;
for (i = 0; i < srcLen; i += 2)
{
highByte = toupper(src[i]);
lowByte = toupper(src[i + 1]);
if (highByte > 0x39)
highByte -= 0x37;
else
highByte -= 0x30;
if (lowByte > 0x39)
lowByte -= 0x37;
else
lowByte -= 0x30;
dest[i / 2] = (highByte << 4) | lowByte;
}
return;
}
unsigned short calc_crc( unsigned char *ptr, int len)
{
unsigned short crc1 = 0,da=0,bbb =0;
while ( len-- != 0 )
{
da = ( crc1 >> 8 ) & 0x00ff; //8??????????CRC??8?
crc1 <<= 8; //?8?,???CRC??8???
crc1 ^= ccitt_table[ ( da ^ ( *ptr ) )]; // ?8?????????????CRC ,??????CRC
ptr++;
}
return crc1;
}
int YD_Crc16(char *source,int len,char *mac)
{
char dest[1000] = {0};
int nret = 0;
HexStrToByte(source, dest, len);
nret = calc_crc(dest,len/2);
sprintf(mac,"%04X",nret);
memcpy(&mac[4],"0000",4);
}
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