参数资料
型号: CMMC-8P-MF
厂商: C-Max
文件页数: 8/22页
文件大小: 0K
描述: MODULE RCVR CME8000 W/CPU & ANT
标准包装: 1
类型: 接收器
频率: 40kHz ~ 120kHz
适用于相关产品: CME8000
已供物品: 模块
其它名称: 561-1016
C-MAX Time Solutions
Datasheet CMMC-8P-MF
CRC-Calculation
The CRC used in the CMMC-8P-MF is based on a CRC16 (see
http://en.wikipedia.org/wiki/CRC16 for details). It is calculated for all bytes of the CMMC-8P-
MF Layer (see General command structure ). If you are using the RS485 protocol, both
addresses are also included in the CRC calculation.
For testing and evaluating reasons, the CMMC-8P-MF will also accept two 0x00 bytes as
CRC. For production environments however, we strongly recommend using valid CRC bytes.
Implementation
A standard implementation in C:
unsigned int CalcCrc16( unsigned char *Buffer,
unsigned char Length)
{
volatile unsigned char i,j;
volatile unsigned int Crc16 = 0;
volatile int c;
char *pBuf;
pBuf = ( char *)(Buffer);
for ( i=0;i<Length;i++)
{
c = *pBuf++;
c = c << 8;
for ( j=0;j<8;j++ )
{
if ( (Crc16^c) & 0x8000 )
Crc16 = ( Crc16<<1 ) ^ 0x1021;
else
Crc16 = Crc16 << 1;
c = c << 1;
}
}
return (Crc16);
}
Spec No.:
CMMC-8P-MF
Revision
179.05
State
07.01.2008
C-MAX printed
07.02.2008
Version
English
Page
8 of 22
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