// Serial.cpp

#include "stdafx.h"
#include "Serial.h"

CSerial::CSerial()
{

	memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
 	memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );
	m_hIDComDev = 0;
	m_bOpened = FALSE;

}

CSerial::~CSerial()
{

	Close();

}

BOOL CSerial::Open( int nPort, int nBaud, char par, int databits, int stopbits)
{
	if( m_bOpened ) return( TRUE );

	char szPort[15];
	char szComParams[50];
	DCB dcb;

	wsprintf( szPort, "\\\\.\\COM%d\0", nPort );
	m_hIDComDev = CreateFile( szPort, GENERIC_READ | GENERIC_WRITE, 0, NULL,
		OPEN_EXISTING, /*FILE_FLAG_OVERLAPPED*/0, 0 );
	if( m_hIDComDev == INVALID_HANDLE_VALUE )
	{
	  DWORD le = GetLastError();

	  return( FALSE );
	}

	memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
 	memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );

	COMMTIMEOUTS CommTimeOuts;
	CommTimeOuts.ReadIntervalTimeout = 0;// 1000;//0xFFFFFFFF;
	CommTimeOuts.ReadTotalTimeoutMultiplier = 0;
	CommTimeOuts.ReadTotalTimeoutConstant = 1000;
	CommTimeOuts.WriteTotalTimeoutMultiplier = 0;
	CommTimeOuts.WriteTotalTimeoutConstant = 5000;
	SetCommTimeouts( m_hIDComDev, &CommTimeOuts );

	wsprintf( szComParams, "COM%d:%d,%c,%d,%d",
		nPort, nBaud, par, databits, stopbits);

	m_OverlappedRead.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
	m_OverlappedWrite.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );

	dcb.DCBlength = sizeof( DCB );
	GetCommState( m_hIDComDev, &dcb );
	dcb.BaudRate = DWORD(nBaud);
	dcb.ByteSize = BYTE(databits);
	dcb.Parity = BYTE(par);
	dcb.StopBits = BYTE(stopbits);

	unsigned char ucSet;
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_DTRDSR ) != 0 );
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_RTSCTS ) != 0 );
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_XONXOFF ) != 0 );
	if( !SetCommState( m_hIDComDev, &dcb ) ||
		!SetupComm( m_hIDComDev, 10000, 10000 ) ||
		m_OverlappedRead.hEvent == NULL ||
		m_OverlappedWrite.hEvent == NULL ){
		DWORD dwError = GetLastError();
		if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
		if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
		CloseHandle( m_hIDComDev );
		return( FALSE );
		}

	m_bOpened = TRUE;

	return( m_bOpened );

}

BOOL CSerial::Close( void )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( TRUE );

	if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
	if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
	CloseHandle( m_hIDComDev );
	m_bOpened = FALSE;
	m_hIDComDev = NULL;

	return( TRUE );

}

BOOL CSerial::WriteCommByte( unsigned char ucByte )
{
	BOOL bWriteStat;
	DWORD dwBytesWritten;

	bWriteStat = WriteFile( m_hIDComDev, (LPSTR) &ucByte, 1, &dwBytesWritten, NULL/*&m_OverlappedWrite*/ );
	/*
	if( !bWriteStat && ( GetLastError() == ERROR_IO_PENDING ) ){
		if( WaitForSingleObject( m_OverlappedWrite.hEvent, 1000 ) ) dwBytesWritten = 0;
		else{
			GetOverlappedResult( m_hIDComDev, &m_OverlappedWrite, &dwBytesWritten, FALSE );
			m_OverlappedWrite.Offset += dwBytesWritten;
			}
		}
    */
	return( TRUE );

}

int CSerial::SendData( const char *buffer, int size )
{
char header[13], trailer[200];
int nbytes;

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	DWORD dwBytesWritten = 0;
	int i;
    
//	sprintf(header,"DATA(%4d):\0",size);
//	sprintf(trailer,"<EOP>\nSOURCE:01 DESTINATION:00 CRC:Pass MPD:0.0 SNR:10.0 SPD:01.1 AGC:1.0 CCER:10 \0");
//	for( i = 0; i < strlen(header); i++) WriteCommByte(header[i]);
	for( i=0; i<size; i++ ){
		WriteCommByte( buffer[i] );
		dwBytesWritten++;
		}
 //   for (i=0;i<strlen(trailer);i++) WriteCommByte(trailer[i]);
	return( (int) dwBytesWritten );

}

int CSerial::ReadDataWaiting( void )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	DWORD dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );

	return( (int) ComStat.cbInQue );

}

int CSerial::ReadData( void *buffer, int limit )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	BOOL bReadStatus;
	DWORD dwBytesRead, dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );
	if( !ComStat.cbInQue ) return( 0 );

	dwBytesRead = (DWORD) ComStat.cbInQue;
	if( limit < (int) dwBytesRead ) dwBytesRead = (DWORD) limit;

	bReadStatus = ReadFile( m_hIDComDev, buffer, dwBytesRead, &dwBytesRead, NULL/*&m_OverlappedRead*/);
	/*
	if( !bReadStatus ){
		if( GetLastError() == ERROR_IO_PENDING ){
			if (WaitForSingleObject( m_OverlappedRead.hEvent, 2000 ) == WAIT_OBJECT_0 )
				return( (int) dwBytesRead );
			}
		return( 0 );
		}
    */ 
	return( (int) dwBytesRead );

}

int CSerial::ReadDataBlocking(void *buffer, int limit)
{

	if (!m_bOpened || m_hIDComDev == NULL) return(0);

	BOOL bReadStatus;
	DWORD dwBytesRead, dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError(m_hIDComDev, &dwErrorFlags, &ComStat);

	bReadStatus = ReadFile(m_hIDComDev, buffer, limit, &dwBytesRead, NULL/*&m_OverlappedRead*/);
	/*
	if( !bReadStatus ){
	if( GetLastError() == ERROR_IO_PENDING ){
	if (WaitForSingleObject( m_OverlappedRead.hEvent, 2000 ) == WAIT_OBJECT_0 )
	return( (int) dwBytesRead );
	}
	return( 0 );
	}
	*/
	return((int)dwBytesRead);

}