SICK LD-OEM Betriebsanleitung Seite 78

Kapitel 10
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
//========================================================================
// global scope function definitions (type modifier: PUBLIC)
/*
--------------------------------------------------------------------------
Function: block_crc16_byte
Abstract: calculates CRC16 signature of a block of bytes
Version: 1
--------------------------------------------------------------------------
Return value:
type functional description
WORD CRC signature
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Importlist:
type identifier
BYTE* data
WORD numofbytes
WORD initial_crc
WORD[] crctab
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Exportlist:
type identifier
none
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*/
PUBLIC WORD block_crc16_byte
(
BYTE* data,
WORD numofbytes,
WORD initial_crc
)
{
WORD crc = initial_crc;
while( numofbytes-- )
crc = ( (crc << 8) | *data++ ) ^ crctab[crc>>8];
return crc;
}
/*
--------------------------------------------------------------------------
10-14
Anhang
functional description
pointer to data block
number of bytes in data block
initial CRC value
CRC XOR table (as global variable)
functional description
© SICK AG · Division Auto Ident · Germany · All rights reserved
Betriebsanleitung
Lasermesssystem LD OEM
8 010 327/0000/28-09-2004