[Programming / C&C++] Serial Port Example

COM Port Serial 통신 예제

SerialPort.h

SerialPort.h

SerialPort.cpp

SerialPort.cpp

[SerialPort.h]

#pragma once #include "stdafx.h" #include <stdio.h> #include <iostream> #include <windows.h> using namespace std; class CSerialPort { public: CSerialPort( void ); virtual ~CSerialPort( void ); private: HANDLE m_hComm; DCB m_dcb; COMMTIMEOUTS m_CommTimeouts; BOOL m_bPortReady; BOOL m_bWriteRC; BOOL m_bReadRC; DWORD m_iBytesWritten; DWORD m_iBytesRead; DWORD m_dwBytesRead; public: bool OpenPort( CString portname ); void ClosePort(); bool ReadByte( BYTE &resp ); bool ReadByte( BYTE* &resp, UINT size ); bool WriteByte( BYTE bybyte ); bool SetCommunicationTimeouts( DWORD ReadIntervalTimeout, DWORD ReadTotalTimeoutMultiplier, DWORD ReadTotalTimeoutConstant, DWORD WriteTotalTimeoutMultiplier,DWORD WriteTotalTimeoutConstant ); bool ConfigurePort( DWORD BaudRate, BYTE ByteSize, DWORD fParity, BYTE Parity, BYTE StopBits ); };

[SerialPort.cpp]

#include "SerialPort.h" #include "stdafx.h" #include <iostream> using namespace std; // ******************************************* // Class Constructor // ******************************************* CSerialPort::CSerialPort() { // } // ******************************************* // Class Destructor // ******************************************* CSerialPort::~CSerialPort() { // } // ******************************************* // Open Port // ******************************************* bool CSerialPort::OpenPort( CString portname ) { m_hComm = CreateFile( L"//./" + portname, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0 ); if ( m_hComm == INVALID_HANDLE_VALUE ) return false; else return true; } // ******************************************* // Configure Port // ******************************************* bool CSerialPort::ConfigurePort( DWORD BaudRate, BYTE ByteSize, DWORD fParity, BYTE Parity, BYTE StopBits ) { if ( ( m_bPortReady = GetCommState( m_hComm, &m_dcb ) ) == 0 ) { ::OutputDebugString( _T("GetCommState Error") ); CloseHandle( m_hComm ); return false; } m_dcb.BaudRate = BaudRate; m_dcb.ByteSize = ByteSize; m_dcb.Parity = Parity; m_dcb.StopBits = StopBits; m_dcb.fBinary = true; m_dcb.fDsrSensitivity = false; m_dcb.fParity = fParity; m_dcb.fOutX = false; m_dcb.fInX = false; m_dcb.fNull = false; m_dcb.fAbortOnError = true; m_dcb.fOutxCtsFlow = false; m_dcb.fOutxDsrFlow = false; m_dcb.fDtrControl = DTR_CONTROL_DISABLE; m_dcb.fDsrSensitivity = false; m_dcb.fRtsControl = RTS_CONTROL_DISABLE; m_dcb.fOutxCtsFlow = false; m_dcb.fOutxCtsFlow = false; m_bPortReady = SetCommState( m_hComm, &m_dcb ); if ( m_bPortReady == 0 ) { ::OutputDebugString( _T("SetCommState Error") ); CloseHandle( m_hComm ); return false; } return true; } // ******************************************* // Set Communication Timeouts // ******************************************* bool CSerialPort::SetCommunicationTimeouts( DWORD ReadIntervalTimeout, DWORD ReadTotalTimeoutMultiplier, DWORD ReadTotalTimeoutConstant, DWORD WriteTotalTimeoutMultiplier, DWORD WriteTotalTimeoutConstant ) { if ( ( m_bPortReady = GetCommTimeouts( m_hComm, &m_CommTimeouts ) ) == 0 ) return false; m_CommTimeouts.ReadIntervalTimeout = ReadIntervalTimeout; m_CommTimeouts.ReadTotalTimeoutConstant = ReadTotalTimeoutConstant; m_CommTimeouts.ReadTotalTimeoutMultiplier = ReadTotalTimeoutMultiplier; m_CommTimeouts.WriteTotalTimeoutConstant = WriteTotalTimeoutConstant; m_CommTimeouts.WriteTotalTimeoutMultiplier = WriteTotalTimeoutMultiplier; m_bPortReady = SetCommTimeouts( m_hComm, &m_CommTimeouts ); if ( m_bPortReady == 0 ) { ::OutputDebugString( _T("StCommTimeouts function failed : COM Port Error") ); CloseHandle( m_hComm ); return false; } return true; } // ******************************************* // Write Byte // ******************************************* bool CSerialPort::WriteByte( BYTE bybyte ) { int iBytesWritten = 0; if ( WriteFile( m_hComm, &bybyte, 1, &m_iBytesWritten, NULL ) == 0 ) return false; else return true; } // ******************************************* // Read Byte // ******************************************* bool CSerialPort::ReadByte( BYTE &resp ) { BYTE rx; resp = 0; DWORD dwBytesTransferred=0; if ( ReadFile( m_hComm, &rx, 1, &dwBytesTransferred, 0 ) ) { if ( dwBytesTransferred == 1 ) { resp = rx; return true; } } return false; } // ******************************************* // Read Byte (Overriding) // ******************************************* bool CSerialPort::ReadByte( BYTE* &resp, UINT size ) { DWORD dwBytesTransferred = 0; if ( ReadFile( m_hComm, resp, size, &dwBytesTransferred, 0 ) ) { if ( dwBytesTransferred == size ) return true; } return false; } // ******************************************* // Close Port // ******************************************* void CSerialPort::ClosePort() { CloseHandle( m_hComm ); return; }

[Example Code]

CSerialPort _serial; _serial.ClosePort(); if ( _serial.OpenPort( L"COM3" ) ) { ::OutputDebugString( _T("Succeded to Open Port\n") ); _serial.ConfigurePort( CBR_9600, 8, FALSE, NOPARITY, ONESTOPBIT ); // Timeout configuration _serial.SetCommunicationTimeouts( 0, 0, 0, 0, 0 ); // memory buffer BYTE* pByte = new BYTE[512]; CString strData = _T(""); CString strTmp = _T(""); if ( _serial.ReadByte( pByte, 512 ) ) { pByte[511] = '\0'; strData = CString( reinterpret_cast<char*>( pByte ) ); strTmp = _T("DATA :"); strTmp += strData; strTmp += _T("\n"); ::OutputDebugString( strTmp ); } else { ::OutputDebugString( _T("Failed to read data\n") ); } delete [] pByte; } else { ::OutputDebugString( _T("Failed to Open Port\n") ); } _serial.ClosePort();