modbusframe.cpp

一个通讯管理机的源代码。比较好用。推荐

#include "modbusframe.h"

/* CRC 高位字节值表 */
static unsigned char auchCRCHi[] = {
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
	0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
	0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
	0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
	0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
	0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
	0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
	0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
	0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
	0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
	0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
	0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
	0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
};

/* CRC低位字节值表*/
static unsigned char auchCRCLo[] = {
	0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 
	0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 
	0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 
	0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 
	0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 
	0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 
	0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 
	0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 
	0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 
	0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 
	0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 
	0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 
	0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 
	0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 
	0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 
	0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 
	0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 
	0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 
	0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 
	0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 
	0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 
	0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 
	0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 
	0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 
	0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 
	0x43, 0x83, 0x41, 0x81, 0x80, 0x40
};

unsigned short CRC16(unsigned char *puchMsg, unsigned short usDataLen)
/* 要进行CRC校验的消息 */
/* 消息中字节数 */
{
	unsigned char uchCRCHi = 0xFF; /* 高CRC字节初始化 */
	unsigned char uchCRCLo = 0xFF; /* 低CRC 字节初始化 */
	unsigned uIndex ; /* CRC循环中的索引 */
	while (usDataLen--) /* 传输消息缓冲区 */
	{
		uIndex = uchCRCHi ^ *puchMsg++; /* 计算CRC */
		uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex];
		uchCRCLo = auchCRCLo[uIndex];
	}
#ifdef _UC7400

	return (uchCRCHi << 8 | uchCRCLo);
#else
	return (uchCRCHi << 8 | uchCRCLo);
//	return (uchCRCHi | uchCRCLo << 8);
#endif
}


////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
bool CModbusFrame::FrameToBuffer(CDataNode &dn)
{
	bool bRet = false;
	if(m_bIsSetup) 
	{ 
		WORD wDataSize = GetDataSize();
		dn.SetSize(wDataSize+4);
		dn.m_pbyData[0]=m_byAddr;
		dn.m_pbyData[1]=m_byCID; 
		if (wDataSize)
			memcpy(dn.m_pbyData+2,m_pData,wDataSize); 
		WORD wTemp = CRC16(dn.m_pbyData,wDataSize+2);
		*(dn.m_pbyData+2+wDataSize) = (wTemp & 0xff00)>>8;
		*(dn.m_pbyData+3+wDataSize) = wTemp & 0xff;

		bRet = true;
	} 
	return bRet;
}

void CModbusFrame::SetupFrame(CFrameNode *pFNSend)
{
	m_byAddr = pFNSend->m_byDesAddr;
	if (pFNSend->m_pbyData && pFNSend->m_wSize)
	{
		m_wLength = pFNSend->m_wSize;
		memcpy(m_pData,pFNSend->m_pbyData,pFNSend->m_wSize);
	}
	else m_wLength = 0;
	m_byCID = pFNSend->m_byCID;
	m_bIsSetup = true;
}

void CModbusFrame::FrameToBuf(CFrameNode& fn)
{
	fn.m_byCID = m_byCID;
	fn.m_bySrcAddr = m_byAddr;
	if (m_wLength)
	{
		fn.SetSize(m_wLength);
		memcpy(fn.m_pbyData,m_pData,m_wLength);
	}
}

bool CModbusFrame::BufferToFrame(CDQue* pPhyDQ)
{
	Reset();
	CDataNode *pDN = NULL;
	bool bRet = false;
	while (pPhyDQ->Get(pDN,100) && pDN)
	{
		if (m_wInLength + pDN->m_wSize > 256)
		{
			delete pDN;
			break;
		}
		memcpy(&m_pbyInBuf[m_wInLength],pDN->m_pbyData,pDN->m_wSize);
		m_wInLength += pDN->m_wSize;
		delete pDN;
		if (m_wInLength >= 3)
		{
			if ((m_pbyInBuf[1]&0x80) == 0x80)
				m_wEchoLen = 5;
			else if (m_bIsSlave)
				m_wEchoLen = 8;
			else if ((m_pbyInBuf[1] != 5) && (m_pbyInBuf[1] != 0x10) &&  (m_pbyInBuf[1] != 6) &&  (m_pbyInBuf[1] != 0xf) && (m_pbyInBuf[2] +5 != m_wEchoLen))
				m_wEchoLen = m_pbyInBuf[2] +5;
		}
		if (m_wInLength>=m_wEchoLen)
		{
			m_wInLength = m_wEchoLen;
			WORD wCRC = m_pbyInBuf[m_wInLength-1] + m_pbyInBuf[m_wInLength-2]*256;
			if (wCRC == CRC16(m_pbyInBuf,m_wInLength-2))
				bRet = true;
			break;
		}
	}
	if (bRet)
	{
		BYTE* pTemp = m_pbyInBuf;
		m_byAddr = *pTemp++;
		m_byCID = *pTemp++;
		m_wLength = m_wInLength - 4;
		if (m_wLength > 0)
		{
			memcpy(m_pData,pTemp,m_wLength);
		}
	}
	return bRet;
}