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/*
RailControl - Model Railway Control Software
Copyright (c) 2017-2025 by Teddy / Dominik Mahrer - www.railcontrol.org
RailControl is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
RailControl is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with RailControl; see the file LICENCE. If not see
<http://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
#include <termios.h>
#include "Network/Select.h"
#include "Network/Serial.h"
namespace Network
{
void Serial::Init()
{
fileHandle = open(tty.c_str(), O_RDWR | O_NOCTTY);
if (!IsConnected())
{
logger->Error(Languages::TextUnableToOpenSerial, tty);
return;
}
struct termios options;
options.c_cflag = 0;
options.c_cc[VMIN] = 1; // read one byte at least
options.c_cc[VTIME] = 0; // timeout disabled
options.c_lflag = 0;
options.c_iflag = 0;
options.c_oflag = 0;
cfsetispeed(&options, dataSpeed);
cfsetospeed(&options, dataSpeed);
switch (dataBits)
{
case 5:
options.c_cflag |= CS5; // 5 data bits
break;
case 6:
options.c_cflag |= CS6; // 6 data bits
break;
case 7:
options.c_cflag |= CS7; // 7 data bits
break;
case 8:
default:
options.c_cflag |= CS8; // 8 data bits
break;
}
if (stopBits == 2)
{
options.c_cflag |= CSTOPB; // 2 stop bit
}
// else 1 stop bit
switch (parity)
{
case 'E':
case 'e':
options.c_cflag |= PARENB; // even parity
break;
case 'O':
case 'o':
options.c_cflag |= PARENB;
options.c_cflag |= PARODD; // odd parity
break;
// default: no parity
}
// CSIZE not set: no datasize
if (hardwareFlowControl == true)
{
options.c_cflag |= CRTSCTS; // hardware flow control
}
options.c_cflag |= CLOCAL; // ignore control lines
options.c_cflag |= CREAD; // enable receiver
tcsetattr(fileHandle, TCSANOW, &options); // store options
ClearBuffers();
}
void Serial::Close()
{
if (!IsConnected())
{
return;
}
close(fileHandle);
fileHandle = -1;
}
bool Serial::Receive(std::string& data, const size_t maxData, const unsigned int timeoutS, const unsigned int timeoutUS)
{
const size_t dataBufferSize = 1024;
unsigned char dataBuffer[dataBufferSize];
const size_t max = maxData > dataBufferSize ? dataBufferSize : maxData;
ssize_t ret = Receive(dataBuffer, max, timeoutS, timeoutUS);
if (ret <= 0)
{
return false;
}
data.append(reinterpret_cast<char*>(dataBuffer), ret);
return true;
}
ssize_t Serial::Receive(unsigned char* data, const size_t maxData, const unsigned int timeoutS, const unsigned int timeoutUS)
{
if (!IsConnected())
{
return -1;
}
fd_set set;
FD_ZERO(&set);
FD_SET(fileHandle, &set);
struct timeval tvTimeout;
tvTimeout.tv_sec = timeoutS;
tvTimeout.tv_usec = timeoutUS;
ssize_t ret = TEMP_FAILURE_RETRY(select(FD_SETSIZE, &set, NULL, NULL, &tvTimeout));
if (ret <= 0)
{
return -1;
}
ret = read(fileHandle, data, maxData);
if (ret <= 0) // FIXME: why not (ret < 0)?
{
return -1;
}
return ret;
}
bool Serial::ReceiveExact(std::string& data, const size_t length, const unsigned int timeoutS, const unsigned int timeoutUS)
{
size_t startSize = data.length();
size_t endSize = startSize + length;
while (endSize > data.length())
{
bool ret = Receive(data, endSize - data.length(), timeoutS, timeoutUS);
if (ret == false)
{
return false;
}
}
return true;
}
ssize_t Serial::ReceiveExact(unsigned char* data, const size_t length, const unsigned int timeoutS, const unsigned int timeoutUS)
{
size_t actualSize = 0;
size_t endSize = length;
while (actualSize < endSize)
{
ssize_t ret = Receive(data + actualSize, endSize - actualSize, timeoutS, timeoutUS);
if (ret <= 0)
{
return actualSize;
}
actualSize += ret;
}
return actualSize;
}
}
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