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__) || defined(__FreeBSD__)
  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   if (IsOpen())
  57     SocketClose(m_socket);
  58 }
  59
  60 void CSerialSocket::Shutdown(void)
  61 {
  62   if (IsOpen())
  63     SocketClose(m_socket);
  64 }
  65
  66 ssize_t CSerialSocket::Write(void* data, size_t len)
  67 {
  68   return IsOpen() ? SocketWrite(m_socket, &m_iError, data, len) : -1;
  69 }
  70
  71 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
  72 {
  73   return IsOpen() ? SocketRead(m_socket, &m_iError, data, len, iTimeoutMs) : -1;
  74 }
  75
  76 //setting all this stuff up is a pain in the ass
  77 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
  78 {
  79   iTimeoutMs = 0;
  80   if (IsOpen())
  81     return false;
  82
  83   if (m_iDatabits != SERIAL_DATA_BITS_FIVE && m_iDatabits != SERIAL_DATA_BITS_SIX &&
  84       m_iDatabits != SERIAL_DATA_BITS_SEVEN && m_iDatabits != SERIAL_DATA_BITS_EIGHT)
  85   {
  86     m_strError = "Databits has to be between 5 and 8";
  87     return false;
  88   }
  89
  90   if (m_iStopbits != SERIAL_STOP_BITS_ONE && m_iStopbits != SERIAL_STOP_BITS_TWO)
  91   {
  92     m_strError = "Stopbits has to be 1 or 2";
  93     return false;
  94   }
  95
  96   if (m_iParity != SERIAL_PARITY_NONE && m_iParity != SERIAL_PARITY_EVEN && m_iParity != SERIAL_PARITY_ODD)
  97   {
  98     m_strError = "Parity has to be none, even or odd";
  99     return false;
 100   }
 101
 102   m_socket = open(m_strName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
 103
 104   if (m_socket == INVALID_SERIAL_SOCKET_VALUE)
 105   {
 106     m_strError = strerror(errno);
 107     return false;
 108   }
 109
 110   SocketSetBlocking(m_socket, false);
 111
 112   if (!SetBaudRate(m_iBaudrate))
 113     return false;
 114
 115   m_options.c_cflag |= (CLOCAL | CREAD);
 116   m_options.c_cflag &= ~HUPCL;
 117
 118   m_options.c_cflag &= ~CSIZE;
 119   if (m_iDatabits == SERIAL_DATA_BITS_FIVE)  m_options.c_cflag |= CS5;
 120   if (m_iDatabits == SERIAL_DATA_BITS_SIX)   m_options.c_cflag |= CS6;
 121   if (m_iDatabits == SERIAL_DATA_BITS_SEVEN) m_options.c_cflag |= CS7;
 122   if (m_iDatabits == SERIAL_DATA_BITS_EIGHT) m_options.c_cflag |= CS8;
 123
 124   m_options.c_cflag &= ~PARENB;
 125   if (m_iParity == SERIAL_PARITY_EVEN || m_iParity == SERIAL_PARITY_ODD)
 126     m_options.c_cflag |= PARENB;
 127   if (m_iParity == SERIAL_PARITY_ODD)
 128     m_options.c_cflag |= PARODD;
 129
 130 #ifdef CRTSCTS
 131   m_options.c_cflag &= ~CRTSCTS;
 132 #elif defined(CNEW_RTSCTS)
 133   m_options.c_cflag &= ~CNEW_RTSCTS;
 134 #endif
 135
 136   if (m_iStopbits == SERIAL_STOP_BITS_ONE) m_options.c_cflag &= ~CSTOPB;
 137   else m_options.c_cflag |= CSTOPB;
 138
 139   //I guessed a little here
 140   m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP);
 141
 142   if (m_iParity == SERIAL_PARITY_NONE)
 143     m_options.c_iflag &= ~INPCK;
 144   else
 145     m_options.c_iflag |= INPCK | ISTRIP;
 146
 147   m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL);
 148   m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL);
 149
 150   if (tcsetattr(m_socket, TCSANOW, &m_options) != 0)
 151   {
 152     m_strError = strerror(errno);
 153     return false;
 154   }
 155
 156   SocketSetBlocking(m_socket, true);
 157   m_bIsOpen = true;
 158
 159   return true;
 160 }
 161
 162 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
 163 {
 164   int rate = IntToBaudrate(baudrate);
 165   if (rate == -1)
 166   {
 167     char buff[255];
 168     sprintf(buff, "%i is not a valid baudrate", baudrate);
 169     m_strError = buff;
 170     return false;
 171   }
 172
 173   //get the current port attributes
 174   if (tcgetattr(m_socket, &m_options) != 0)
 175   {
 176     m_strError = strerror(errno);
 177     return false;
 178   }
 179
 180   if (cfsetispeed(&m_options, rate) != 0)
 181   {
 182     m_strError = strerror(errno);
 183     return false;
 184   }
 185
 186   if (cfsetospeed(&m_options, rate) != 0)
 187   {
 188     m_strError = strerror(errno);
 189     return false;
 190   }
 191
 192   return true;
 193 }