CRC校验原理与程序设计——(RS485总线系统应用之1)

时间：12-15 来源：互联网点击：

}

3.2.2用VB编写的程序

Function CRC16(Data() As Byte, No As Integer, CRC16Lo As Byte, CRC16Hi As Byte) As String

Dim CL As Byte, CH As Byte, SaveLo As Byte, SaveHi As Byte

CRC16Hi = &HFF为16位CRC校验寄存器赋初始值FFFF

CRC16Lo = &HFF

CH = &HA0为16位CRC校验多项式赋初始值A001

CL = &H1

For i = 1 To No

CRC16Lo = CRC16Lo Xor Data(i - 1)每一个数据与CRC寄存器进行异或

For j = 1 To 8

SaveHi = CRC16Hi

SaveLo = CRC16Lo

CRC16Hi = CRC16Hi 2高位右移一位

CRC16Lo = CRC16Lo 2低位右移一位

If ((SaveHi And &H1) = &H1) Then如果高位字节最右一位为1

CRC16Lo = CRC16Lo Or &H80则低位字节最左一位补1，否则自动补0

End If

If ((SaveLo And &H1) = &H1) Then如低位字节最右一位为1，则与多项式值异或

CRC16Hi = CRC16Hi Xor CH

CRC16Lo = CRC16Lo Xor CL

End If

Next j

Next i

End Function

参考文献：

①GB/T 19582.1-2008《基于Modbus协议的工业自动化网络规范》

②《Modbus协议中文版》可在互联网上下载

附表：CRC校验标准类型

CRC校验名	多项式(标准引用名)	对应的16进制值或反值注：已去掉最高位的1
CRC-1	x + 1 (most hardware; also known as parity bit)	01或01 (01)
CRC-4-ITU	x4+x+ 1 (ITU G.704, p. 12)	03或0C (09)
CRC-5-ITU	x5+x4+x2+ 1 (ITU G.704, p. 9)	15或15 (1A)
CRC-5-USB	x5+x2+ 1 (USB token packets)	05或14 (12)
CRC-6-ITU	x6+x+ 1 (ITU G.704, p. 3)	03或30 (21)
CRC-7	x7+x3+ 1 (telecom systems, MMC,SD)	09或48 (44)
CRC-8-ATM	x8+x2+x+ 1 (ATM HEC)	07或E0 (83)
CRC-8-CCITT	x8+x7+x3+x2+ 1 (1-Wire bus)	8D或B1 (C6)
CRC-8-Dallas/Maxim	x8+x5+x4+ 1 (1-Wire bus)	31或8C (98)
CRC-8	x8+x7+x6+x4+x2+ 1	D5或AB (EA)
CRC-8-SAE J1850	x8+x4+x3+x2+ 1	1D或B8 (8E)
CRC-10	x10+x9+x5+x4+x+ 1	233或331 (319)
CRC-11	x11+x9+x8+x7+x+ 1 (FlexRay)	385或50E (5C2)
CRC-12	x12+x11+x3+x2+x+ 1 (telecom systems )	80F或F01 (C07)
CRC-15-CAN	x15+x14+x10+x8+x7+x4+x3+ 1	4599或4CD1 (62CC)
CRC-16-Fletcher	Not a CRC; see Fletchers checksum	Used in Adler-32 A & B CRCs
CRC-16-CCITT	x16+x12+x5+ 1 (CRC-CCITT, G.hn PHY headers, 802.15.4, X.25, V.41, CDMA, Bluetooth, XMODEM, HDLC,PPP, IrDA, BACnet, MMC,SD)	1021或8408 (8810)
CRC-16-DNP	x16+x13+x12+x11+x10+x8+x6+x5+x2+ 1 (DNP, IEC 870, M-Bus)	3D65或A6BC (9EB2)
CRC-16-IBM	x16+x15+x2+ 1 (CRC-16, SDLC, USB, many others)	8005或A001 (C002)
CRC-24-Radix-64	x24+x23+x18+x17+x14+x11+x10+x7+x6+x5+x4+x3+x+ 1 (FlexRay)	864CFB或DF3261 (C3267D)
CRC-30	x30+x29+x21+x20+x15+x13+x12+x11+x8+x7+x6+x2+x+ 1 (CDMA)	2030B9C7或38E74301 (30185CE3)
CRC-32-Adler	Not a CRC; see Adler-32	See Adler-32
CRC-32-IEEE 802.3	x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+ 1 (V.42, MPEG-2, PNG [10], POSIX cksum)	04C11DB7或EDB88320 (82608EDB)
CRC-32C (Castagnoli)	x32+ x28+ x27+ x26+ x25+ x23+ x22+ x20+ x19+ x18+ x14+ x13+ x11+ x10+ x9+ x8+ x6+ 1 (G.hn payload)	1EDC6F41或82F63B78 (8F6E37A0)
CRC-32K (Koopman)	x32+x30+x29+x28+x26+x20+x19+x17+x16+x15+x11+x10+x7+x6+x4+x2+x+ 1	741B8CD7或EB31D82E (BA0DC66B)
CRC-64-ISO	x64+x4+x3+ x + 1 (HDLC-ISO 3309)	000000000000001B或D800000000000000 (800000000000000D)
CRC-64-ECMA-182	x64+ x62+ x57+ x55+ x54+ x53+ x52+ x47+ x46+ x45+ x40+ x39+ x38+ x37+ x35+ x33+ x32+ x31+ x29+ x27+ x24+ x23+ x22+ x21+ x19+ x17+ x13+ x12+ x10+ x9+ x7+ x4+ x + 1 (As described in ECMA-182 p.51)	42F0E1EBA9EA3693或C96C5795D7870F42 (A17870F5D4F51B49)

上一篇：基于PLC的中频逆变电阻点焊机研制
下一篇：I2C之知(三)--I2C总线的字节格式、时钟同步和仲裁

CRC校验RS485总相关文章：

栏目分类