src/lib/platform/posix/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 "../os.h"
  34 #include <stdio.h>
  35 #include <fcntl.h>
  36 #include "../sockets/serialport.h"
  37 #include "../util/baudrate.h"
  38 #include "../posix/os-socket.h"
  39
  40 #if defined(__APPLE__)
  41 #ifndef XCASE
  42 #define XCASE   0
  43 #endif
  44 #ifndef OLCUC
  45 #define OLCUC   0
  46 #endif
  47 #ifndef IUCLC
  48 #define IUCLC   0
  49 #endif
  50 #endif
  51 using namespace std;
  52 using namespace PLATFORM;
  53
  54 void CSerialSocket::Close(void)
  55 {
  56   SocketClose(m_socket);
  57 }
  58
  59 void CSerialSocket::Shutdown(void)
  60 {
  61   SocketClose(m_socket);
  62 }
  63
  64 ssize_t CSerialSocket::Write(void* data, size_t len)
  65 {
  66   return SocketWrite(m_socket, &m_iError, data, len);
  67 }
  68
  69 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
  70 {
  71   return SocketRead(m_socket, &m_iError, data, len, iTimeoutMs);
  72 }
  73
  74 //setting all this stuff up is a pain in the ass
  75 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
  76 {
  77   iTimeoutMs = 0;
  78   CLockObject lock(m_mutex);
  79
  80   if (m_iDatabits != SERIAL_DATA_BITS_FIVE && m_iDatabits != SERIAL_DATA_BITS_SIX &&
  81       m_iDatabits != SERIAL_DATA_BITS_SEVEN && m_iDatabits != SERIAL_DATA_BITS_EIGHT)
  82   {
  83     m_strError = "Databits has to be between 5 and 8";
  84     return false;
  85   }
  86
  87   if (m_iStopbits != SERIAL_STOP_BITS_ONE && m_iStopbits != SERIAL_STOP_BITS_TWO)
  88   {
  89     m_strError = "Stopbits has to be 1 or 2";
  90     return false;
  91   }
  92
  93   if (m_iParity != SERIAL_PARITY_NONE && m_iParity != SERIAL_PARITY_EVEN && m_iParity != SERIAL_PARITY_ODD)
  94   {
  95     m_strError = "Parity has to be none, even or odd";
  96     return false;
  97   }
  98
  99   m_socket = open(m_strName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
 100
 101   if (m_socket == INVALID_SERIAL_SOCKET_VALUE)
 102   {
 103     m_strError = strerror(errno);
 104     return false;
 105   }
 106
 107   SocketSetBlocking(m_socket, false);
 108
 109   if (!SetBaudRate(m_iBaudrate))
 110     return false;
 111
 112   m_options.c_cflag |= (CLOCAL | CREAD);
 113   m_options.c_cflag &= ~HUPCL;
 114
 115   m_options.c_cflag &= ~CSIZE;
 116   if (m_iDatabits == SERIAL_DATA_BITS_FIVE)  m_options.c_cflag |= CS5;
 117   if (m_iDatabits == SERIAL_DATA_BITS_SIX)   m_options.c_cflag |= CS6;
 118   if (m_iDatabits == SERIAL_DATA_BITS_SEVEN) m_options.c_cflag |= CS7;
 119   if (m_iDatabits == SERIAL_DATA_BITS_EIGHT) m_options.c_cflag |= CS8;
 120
 121   m_options.c_cflag &= ~PARENB;
 122   if (m_iParity == SERIAL_PARITY_EVEN || m_iParity == SERIAL_PARITY_ODD)
 123     m_options.c_cflag |= PARENB;
 124   if (m_iParity == SERIAL_PARITY_ODD)
 125     m_options.c_cflag |= PARODD;
 126
 127 #ifdef CRTSCTS
 128   m_options.c_cflag &= ~CRTSCTS;
 129 #elif defined(CNEW_RTSCTS)
 130   m_options.c_cflag &= ~CNEW_RTSCTS;
 131 #endif
 132
 133   if (m_iStopbits == SERIAL_STOP_BITS_ONE) m_options.c_cflag &= ~CSTOPB;
 134   else m_options.c_cflag |= CSTOPB;
 135
 136   //I guessed a little here
 137   m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP);
 138
 139   if (m_iParity == SERIAL_PARITY_NONE)
 140     m_options.c_iflag &= ~INPCK;
 141   else
 142     m_options.c_iflag |= INPCK | ISTRIP;
 143
 144   m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL);
 145   m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL);
 146
 147   if (tcsetattr(m_socket, TCSANOW, &m_options) != 0)
 148   {
 149     m_strError = strerror(errno);
 150     return false;
 151   }
 152
 153   SocketSetBlocking(m_socket, true);
 154   m_bIsOpen = true;
 155
 156   return true;
 157 }
 158
 159 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
 160 {
 161   int rate = IntToBaudrate(baudrate);
 162   if (rate == -1)
 163   {
 164     char buff[255];
 165     sprintf(buff, "%i is not a valid baudrate", baudrate);
 166     m_strError = buff;
 167     return false;
 168   }
 169
 170   //get the current port attributes
 171   if (tcgetattr(m_socket, &m_options) != 0)
 172   {
 173     m_strError = strerror(errno);
 174     return false;
 175   }
 176
 177   if (cfsetispeed(&m_options, rate) != 0)
 178   {
 179     m_strError = strerror(errno);
 180     return false;
 181   }
 182
 183   if (cfsetospeed(&m_options, rate) != 0)
 184   {
 185     m_strError = strerror(errno);
 186     return false;
 187   }
 188
 189   return true;
 190 }