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 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
  39 #if defined(__APPLE__)
  40 #ifndef XCASE
  41 #define XCASE   0
  42 #endif
  43 #ifndef OLCUC
  44 #define OLCUC   0
  45 #endif
  46 #ifndef IUCLC
  47 #define IUCLC   0
  48 #endif
  49 #endif
  50 using namespace std;
  51 using namespace PLATFORM;
  52
  53 CSerialPort::CSerialPort()
  54 {
  55   m_tostdout = false;
  56 }
  57
  58 //setting all this stuff up is a pain in the ass
  59 bool CSerialPort::Open(string name, uint32_t baudrate, uint8_t databits /* = 8 */, uint8_t stopbits /* = 1 */, uint8_t parity /* = PAR_NONE */)
  60 {
  61   m_name = name;
  62   CLockObject lock(m_mutex);
  63
  64   if (databits < 5 || databits > 8)
  65   {
  66     m_strError = "Databits has to be between 5 and 8";
  67     return false;
  68   }
  69
  70   if (stopbits != 1 && stopbits != 2)
  71   {
  72     m_strError = "Stopbits has to be 1 or 2";
  73     return false;
  74   }
  75
  76   if (parity != PAR_NONE && parity != PAR_EVEN && parity != PAR_ODD)
  77   {
  78     m_strError = "Parity has to be none, even or odd";
  79     return false;
  80   }
  81
  82   m_socket = open(name.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
  83
  84   if (m_socket == INVALID_SOCKET)
  85   {
  86     m_strError = strerror(errno);
  87     return false;
  88   }
  89
  90   SocketSetBlocking(m_socket, false);
  91
  92   if (!SetBaudRate(baudrate))
  93     return false;
  94
  95   m_options.c_cflag |= (CLOCAL | CREAD);
  96   m_options.c_cflag &= ~HUPCL;
  97
  98   m_options.c_cflag &= ~CSIZE;
  99   if (databits == 5) m_options.c_cflag |= CS5;
 100   if (databits == 6) m_options.c_cflag |= CS6;
 101   if (databits == 7) m_options.c_cflag |= CS7;
 102   if (databits == 8) m_options.c_cflag |= CS8;
 103
 104   m_options.c_cflag &= ~PARENB;
 105   if (parity == PAR_EVEN || parity == PAR_ODD)
 106     m_options.c_cflag |= PARENB;
 107   if (parity == PAR_ODD)
 108     m_options.c_cflag |= PARODD;
 109
 110 #ifdef CRTSCTS
 111   m_options.c_cflag &= ~CRTSCTS;
 112 #elif defined(CNEW_RTSCTS)
 113   m_options.c_cflag &= ~CNEW_RTSCTS;
 114 #endif
 115
 116   if (stopbits == 1) m_options.c_cflag &= ~CSTOPB;
 117   else m_options.c_cflag |= CSTOPB;
 118
 119   //I guessed a little here
 120   m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP);
 121
 122   if (parity == PAR_NONE)
 123   {
 124     m_options.c_iflag &= ~INPCK;
 125   }
 126   else
 127   {
 128     m_options.c_iflag |= INPCK | ISTRIP;
 129   }
 130
 131   m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL);
 132   m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL);
 133
 134   if (tcsetattr(m_socket, TCSANOW, &m_options) != 0)
 135   {
 136     m_strError = strerror(errno);
 137     return false;
 138   }
 139
 140   SocketSetBlocking(m_socket, true);
 141
 142   return true;
 143 }
 144
 145 bool CSerialPort::SetBaudRate(uint32_t baudrate)
 146 {
 147   int rate = IntToBaudrate(baudrate);
 148   if (rate == -1)
 149   {
 150     char buff[255];
 151     sprintf(buff, "%i is not a valid baudrate", baudrate);
 152     m_strError = buff;
 153     return false;
 154   }
 155
 156   //get the current port attributes
 157   if (tcgetattr(m_socket, &m_options) != 0)
 158   {
 159     m_strError = strerror(errno);
 160     return false;
 161   }
 162
 163   if (cfsetispeed(&m_options, rate) != 0)
 164   {
 165     m_strError = strerror(errno);
 166     return false;
 167   }
 168
 169   if (cfsetospeed(&m_options, rate) != 0)
 170   {
 171     m_strError = strerror(errno);
 172     return false;
 173   }
 174
 175   return true;
 176 }