icemodem.cpp

Windows CE下Modem(调制解调器)源代码

/* ICEModem.cpp
 *
 * 对串口进行操作的类。
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "stdafx.h"
#include "CSerial.h"
#include "common.h"

ICEModem::ICEModem()
{
	iSequence = 0;
	iModemReturn = MODEM_UNKNOWSTATIC;	// MODEM 返回。
	iSendType   = 0;
	AutoResp    = 0;
}

ICEModem::~ICEModem()
{
	
}

// 选择串口。
BOOL ICEModem::Init(int ComPort,int Speed,char *InitCmd)
{
	char 		sRet[200] = {0};
	int 		iResponse = 0,iRet = 0;
	
	do
	{
		switch(Speed)
		{
		case 110:
			Speed = CBR_110;
			break;
		case 300:
			Speed = CBR_300;
			break;
		case 600:
			Speed = CBR_600;
			break;
		case 1200:
			Speed = CBR_1200;
			break;
		case 2400:
			Speed = CBR_2400;
			break;
		case 4800:
			Speed = CBR_4800;
			break;
		case 9600:
			Speed = CBR_9600;
			break;
		case 14400:
			Speed = CBR_14400;
			break;
		case 19200:
			Speed = CBR_19200;
			break;
		case 38400:
			Speed = CBR_38400;
			break;
		case 56000:
			Speed = CBR_56000;
			break;
		case 57600:
			Speed = CBR_57600;
			break;
		case 115200:
			Speed = CBR_115200;
			break;
		case 128000:
			Speed = CBR_128000;
			break;
		case 256000:
			Speed = CBR_256000;
			break;
		default:
			Speed = CBR_9600;
			break;
		}
		if(ComPort.Open(ComPort,Speed))
		{
			break;
		}
		else{
			return FALSE;
		}
	}while(1);

	// 初始化MODEM。
	// ComPort = 3;
	iResponse = ComPort.SendCommand(InitCmd, strlen(InitCmd));
	if(iResponse < (int)strlen(InitCmd))
	{
		return FALSE;
	}
	Sleep(10);
	int Times=0;
	sRet[0] = '\0';
	//等待Modem响应初始化命令
	while( 1 )
	{
		Times++;
		if( Times > 300 )				// 超时: 3s
			break;
		if( ComPort.ReadData( sRet, 200 ) > 3 )
			if( strstr( sRet, "OK" ) )
				break;
		Sleep(10);
	}
	if( Times > 300 )
	{
		iStatus = 10;					// 当前和串口连接建立。	
		return FALSE;
	}
	else
	{
		iStatus = 20;					// 当前和MODEM连接建立。
	}
	return TRUE;	
}

unsigned int ICEModem::ReadData(char *pBuf)
{
	return 0;
}

unsigned int ICEModem::WriteData(char *pBuf)
{
	return 0;
}

// 分析接收到的数据。
// 返回值：成功为真(不重发此帧数据)；失败为假(需重发此帧数据).
// piType返回此帧的数据类型
BOOL ICEModem::AnalyseData(char *pBuf, int iSize,int *piType)
{
	//static unsigned int	uiSequence = 0;
	//SendData_T	SendData = pBuf;
	WORD		wCrc = 0;
	int			i = 0;
	BOOL		bRet = TURE;
	
	if(pBuf == NULL || strlen(pBuf) != iSize || iSize < 3)	//参数错误
	{
		return ;
	}
	
	piType = pBuf[0];
	switch(piType)
	{
		case	SOH:		//数据传输开始标志
			uiSequence = 0;
			if(uiSequence == pBuf[1])	//序列号正确
			{
				wCrc = CalCRC(SendData.cData);
				if(wCrc == SendData.wCRC)
				{
					bRet = TURE;
					uiSequence++;
				}
				else{	//请求重发此帧
					bRet = FALSE;
				}
			}
			else{		//请求重发引帧
				bRet = FALSE;
			}
			break;
		case	EOT:		//数据传输结束标志
			if(uiSequence == pBuf[1])	//序列号正确
			{
				wCrc = CalCRC(SendData.cData);
				if(wCrc == SendData.wCRC)
				{
					bRet = TURE;
					uiSequence = 0;
				}
				else{	//请求重发此帧
					bRet = FALSE;
				}
			}
			else{		//请求重发引帧
				bRet = FALSE;
			{
			break;
		case	TYPE_ACK:	//确认
			ResData = pBuf;
			wCrc = CalCRC(SendData.cData);
			if(wCrc == SendData.wCRC)
			{
				bRet = TRUE;
				uiSequence++;
			}
			else{	//请求重发此帧
				bRet = FALSE;
			}
			break;
		case	TYPE_DATA:	//数据类型
			SendData = pBuf;
			if(uiSequence == pBuf[1])	//序列号正确
			{
				wCrc = CalCRC(SendData.cData);
				if(wCrc == SendData.wCRC)
				{
					bRet = TRUE;
					uiSequence++;
				}
				else{	//请求重发此帧
					bRet = FALSE;
				}
			}
			else{		//请求重发此帧
				bRet = FALSE;
			}
			break;
		default：			//其它标志：错误
			bRet = FALSE;
			break;
	}
	return bRet;
}