framehandler.cpp

自编的串口通信程序

// FrameHandler.cpp : implementation file
//

#include "stdafx.h"
#include "AutoDemo.h"
#include "FrameHandler.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/*
* FCS lookup table as calculated by the table generator.
*/
static WORD fcstab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

/////////////////////////////////////////////////////////////////////////////
// CFrameHandler

IMPLEMENT_DYNCREATE(CFrameHandler, CWinThread)

CFrameHandler::CFrameHandler()
{
	m_pFrameBufList=NULL;
}

CFrameHandler::~CFrameHandler()
{
}

BOOL CFrameHandler::InitInstance()
{
	// TODO:  perform and per-thread initialization here
	m_pSerialHandler= new CSerialHandler(this);
	m_pSerialHandler->OpenConnection();
	return TRUE;
}

int CFrameHandler::ExitInstance()
{
	// TODO:  perform any per-thread cleanup here
	return CWinThread::ExitInstance();
}

BEGIN_MESSAGE_MAP(CFrameHandler, CWinThread)
	//{{AFX_MSG_MAP(CFrameHandler)
		// NOTE - the ClassWizard will add and remove mapping macros here.
	ON_THREAD_MESSAGE(WM_SERIAL_CMD,OnSerialCmd)
    ON_THREAD_MESSAGE(WM_SERIAL_RX_CHAR,OnSerialRxRead)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFrameHandler message handlers


void CFrameHandler::ConfigSerial(SERIAL_PARAM *pSerialParam)
{

}

LRESULT CFrameHandler::OnSerialCmd(WPARAM wPARAM, LPARAM lPARAM)
{
	char * pBufData=(char *)wPARAM,* pBufFrame;
	WORD Fcs,len;
	len=MAKEWORD(pBufData[0],pBufData[1]);
	pBufFrame=new char[FRAME_MARK+len+FCS_BITS];
	

	pBufFrame[0]=FRAME_BEGIN;
	::memcpy(&pBufFrame[1],pBufData,len);
	Fcs=HdlcFcs16(HDLC_INITFCS16,(unsigned char *)&pBufFrame[1],len);
	Fcs^=0xffff;
	pBufFrame[len]=(Fcs&0x00ff);
	pBufFrame[len+1]=((Fcs>>8)&0x00ff);
	pBufFrame[len+2]=FRAME_END;

	return 0L;

}
LRESULT CFrameHandler::OnSerialRxRead(WPARAM wPARAM, LPARAM lPARAM)
{
	UINT len=0,pos=0;
	if(m_pSerialHandler)
		m_pSerialHandler->ReadComm((unsigned char *)&m_cFrameBuf[m_nFrameBufPos],
								   &len,MAX_RS232_RX_BUF-m_nFrameBufPos);
	m_nFrameBufPos+=len;
	if(m_nFrameBufPos>=MIN_FRAME_LEN&&//The min len of a valid frame
	   (pos=CheckFrame()))
	{
		if(HdlcFcs16(HDLC_INITFCS16,(unsigned char *)&m_cFrameBuf[1],len-2)==
			HDLC_INITFCS16)
		{
			char *pBuf=0;

			AllocFrameMem(&pBuf,PADDING_LEN(m_cFrameBuf));
			::memcpy(pBuf,&m_cFrameBuf[1],PADDING_LEN(m_cFrameBuf)-FCS_BITS);
			::memmove(m_cFrameBuf,&m_cFrameBuf[pos+1],m_nFrameBufPos-pos-1);
			m_nFrameBufPos-=(PADDING_LEN(m_cFrameBuf)+FRAME_MARK);
			
			m_pParentApp->PostThreadMessage(WM_SERIAL_CMD_RSP,(WPARAM)pBuf,0);
		}else{
			//error process
		}
	}	
	return 0L;
}

UINT CFrameHandler::CheckFrame()
{
	UINT i=0,padding_len;

	padding_len=PADDING_LEN(m_cFrameBuf);

	if(m_cFrameBuf[0]==FRAME_BEGIN&&
	   m_nFrameBufPos>=(FRAME_MARK+padding_len))
	{
		if(m_cFrameBuf[padding_len+1]==FRAME_END)
			return padding_len+1;
		else
			return 0;
	}else
		return 0;

}

WORD CFrameHandler::HdlcFcs16(WORD fcs, unsigned char *cp, int len)
{
	while (len--)
		fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
	return (fcs);

}

char * CFrameHandler::AllocFrameMem(char **buf, UINT len)
{
	if(m_pFrameBufList==NULL)
	{
		m_pFrameBufList=new FRAME_BUF_LIST;
		*buf=new char[len];
		m_pFrameBufList->pBuf=*buf;
		m_pFrameBufList->pNextBuf=NULL;
	}else{
		FRAME_BUF_LIST * pList=new FRAME_BUF_LIST;

		pList->pNextBuf=m_pFrameBufList->pNextBuf;
		*buf=pList->pBuf=new char[len];
		m_pFrameBufList->pNextBuf=pList;
	}
	return *buf;
}

BOOL CFrameHandler::FreeFrameMem(char **buf)
{
	FRAME_BUF_LIST* pList,pTmp=NULL;

	if(m_pFrameBufList==NULL||*buf==NULL)
		return FALSE;
	else
		pList=m_pFrameBufList;

	while(pList->pBuf!=*buf&&
		  pList->pNextBuf!=NULL)
	{
		pTmp=pList;
		pList=pList->pNextBuf;
	}
	if(pList->pBuf==*buf)//it is in frame buf list
	{
		if(pTmp==NULL)//it is the first buf
		{
			delete *buf;
			delete m_pFrameBufList;
			
			*buf=NULL
			m_pFrameBufList=pList->pNextBuf;
			return TRUE;
		}else{
			pTmp->pNextBuf=List->pNextBuf;
			delete *buf;
			delete pList;

			*buf=NULL;
			return TRUE;
		}
	}else
		return FALSE;
}