src/lib/platform/windows/serialport.cpp

   1 /*
   2  * This file is part of the libCEC(R) library.
   3  *
   4  * libCEC(R) is Copyright (C) 2011-2012 Pulse-Eight Limited.  All rights reserved.
   5  * libCEC(R) is an original work, containing original code.
   6  *
   7  * libCEC(R) is a trademark of Pulse-Eight Limited.
   8  *
   9  * This program is dual-licensed; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  *
  23  *
  24  * Alternatively, you can license this library under a commercial license,
  25  * please contact Pulse-Eight Licensing for more information.
  26  *
  27  * For more information contact:
  28  * Pulse-Eight Licensing       <license@pulse-eight.com>
  29  *     http://www.pulse-eight.com/
  30  *     http://www.pulse-eight.net/
  31  */
  32
  33 #include "../sockets/serialport.h"
  34 #include "../util/baudrate.h"
  35 #include "../util/timeutils.h"
  36
  37 using namespace std;
  38 using namespace PLATFORM;
  39
  40 void FormatWindowsError(int iErrorCode, CStdString &strMessage)
  41 {
  42   if (iErrorCode != ERROR_SUCCESS)
  43   {
  44     char strAddMessage[1024];
  45     FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, iErrorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), strAddMessage, 1024, NULL);
  46     strMessage.append(": ");
  47     strMessage.append(strAddMessage);
  48   }
  49 }
  50
  51 bool CSerialSocket::SetTimeouts(serial_socket_t socket, int* iError, DWORD iTimeout)
  52 {
  53   if (socket == INVALID_HANDLE_VALUE)
  54           return false;
  55
  56   if (iTimeout == m_iCurrentTimeout)
  57     return true;
  58
  59   COMMTIMEOUTS cto;
  60   if (!GetCommTimeouts(socket, &cto))
  61   {
  62     *iError = GetLastError();
  63     return false;
  64   }
  65
  66   cto.ReadIntervalTimeout         = 0;
  67   cto.ReadTotalTimeoutConstant    = iTimeout;
  68   cto.ReadTotalTimeoutMultiplier  = 0;
  69
  70   if (!SetCommTimeouts(socket, &cto))
  71   {
  72     *iError = GetLastError();
  73     return false;
  74   }
  75
  76   m_iCurrentTimeout = iTimeout;
  77   return true;
  78 }
  79
  80 void CSerialSocket::Close(void)
  81 {
  82   if (IsOpen())
  83     SerialSocketClose(m_socket);
  84   m_socket = INVALID_SERIAL_SOCKET_VALUE;
  85 }
  86
  87 void CSerialSocket::Shutdown(void)
  88 {
  89   if (IsOpen())
  90     SerialSocketClose(m_socket);
  91   m_socket = INVALID_SERIAL_SOCKET_VALUE;
  92 }
  93
  94 ssize_t CSerialSocket::Write(void* data, size_t len)
  95 {
  96   return IsOpen() ? SerialSocketWrite(m_socket, &m_iError, data, len) : -1;
  97 }
  98
  99 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
 100 {
 101   if (IsOpen())
 102   {
 103     DWORD iTimeout((DWORD)iTimeoutMs);
 104     if (iTimeout != iTimeoutMs)
 105       return -1;
 106
 107     int iError(0);
 108     if (!SetTimeouts(m_socket, &iError, iTimeout))
 109       return -1;
 110
 111     return SerialSocketRead(m_socket, &m_iError, data, len, iTimeoutMs);
 112   }
 113
 114   return -1;
 115 }
 116
 117 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
 118 {
 119   iTimeoutMs = 0;
 120   if (IsOpen())
 121     return false;
 122
 123   CStdString strComPath = "\\\\.\\" + m_strName;
 124   CLockObject lock(m_mutex);
 125   m_socket = CreateFile(strComPath.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
 126   if (m_socket == INVALID_HANDLE_VALUE)
 127   {
 128     m_strError = "Unable to open COM port";
 129     FormatWindowsError(GetLastError(), m_strError);
 130     return false;
 131   }
 132
 133   COMMCONFIG commConfig = {0};
 134   DWORD dwSize = sizeof(commConfig);
 135   commConfig.dwSize = dwSize;
 136   if (GetDefaultCommConfig(strComPath.c_str(), &commConfig,&dwSize))
 137   {
 138     if (!SetCommConfig(m_socket, &commConfig,dwSize))
 139     {
 140       m_strError = "unable to set default config";
 141       FormatWindowsError(GetLastError(), m_strError);
 142     }
 143   }
 144   else
 145   {
 146     m_strError = "unable to get default config";
 147     FormatWindowsError(GetLastError(), m_strError);
 148   }
 149
 150   if (!SetupComm(m_socket, 64, 64))
 151   {
 152     m_strError = "unable to set up the com port";
 153     FormatWindowsError(GetLastError(), m_strError);
 154   }
 155
 156   if (!SetBaudRate(m_iBaudrate))
 157   {
 158     m_strError = "unable to set baud rate";
 159     FormatWindowsError(GetLastError(), m_strError);
 160     Close();
 161     return false;
 162   }
 163
 164   if (!SetTimeouts(m_socket, &m_iError, MAXDWORD))
 165   {
 166     m_strError = "unable to set timeouts";
 167     FormatWindowsError(GetLastError(), m_strError);
 168     Close();
 169     return false;
 170   }
 171
 172   m_bIsOpen = true;
 173   return m_bIsOpen;
 174 }
 175
 176 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
 177 {
 178   int32_t rate = IntToBaudrate(baudrate);
 179   if (rate < 0)
 180     m_iBaudrate = baudrate > 0 ? baudrate : 0;
 181   else
 182     m_iBaudrate = rate;
 183
 184   DCB dcb;
 185   memset(&dcb,0,sizeof(dcb));
 186   dcb.DCBlength = sizeof(dcb);
 187   dcb.BaudRate      = IntToBaudrate(m_iBaudrate);
 188   dcb.fBinary       = true;
 189   dcb.fDtrControl   = DTR_CONTROL_DISABLE;
 190   dcb.fRtsControl   = RTS_CONTROL_DISABLE;
 191   dcb.fOutxCtsFlow  = false;
 192   dcb.fOutxDsrFlow  = false;
 193   dcb.fOutX         = false;
 194         dcb.fInX          = false;
 195   dcb.fAbortOnError = true;
 196
 197   if (m_iParity == SERIAL_PARITY_NONE)
 198     dcb.Parity = NOPARITY;
 199   else if (m_iParity == SERIAL_PARITY_EVEN)
 200     dcb.Parity = EVENPARITY;
 201   else
 202     dcb.Parity = ODDPARITY;
 203
 204   if (m_iStopbits == SERIAL_STOP_BITS_TWO)
 205     dcb.StopBits = TWOSTOPBITS;
 206   else
 207     dcb.StopBits = ONESTOPBIT;
 208
 209   dcb.ByteSize = (BYTE)m_iDatabits;
 210
 211   if(!SetCommState(m_socket,&dcb))
 212   {
 213     m_strError = "SetCommState failed";
 214     FormatWindowsError(GetLastError(), m_strError);
 215     return false;
 216   }
 217
 218   return true;
 219 }