OBID
i-scan
®
HF System-Manual
ID
ISC.LR1002
FEIG ELECTRONIC GmbH
Page 24 of 173
H20411-0e-ID-B.docx
Data format:
Start bits:
1
Data bits:
8
Stop bits:
1
Parity: even
(default)
odd
none
CRC16 Calculation Algorithm
Polynom: x
16
+ x
12
+ x
5
+ 1
⇒
CRC_POLYNOM = 0x8408;
Start Value:
0xFFFF
⇒
CRC_PRESET = 0xFFFF;
C-Example:
unsigned int crc = CRC_PRESET;
for (i = 0; i < cnt; i++)
/* cnt = number of protocol bytes without CRC */
{
crc ^= DATA[i];
for (j = 0; j < 8; j++)
{
if (crc & 0x0001)
crc = (crc >> 1) ^ CRC_POLYNOM;
else
crc = (crc >> 1);
}
}