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#include <stdio.h>
#include <string.h> /* String function definitions */
#include <unistd.h> /* UNIX standard function definitions */
#include <fcntl.h> /* File control definitions */
#include <errno.h> /* Error number definitions */
#include <termios.h>
#include <sys/select.h>
#include <errno.h>
#include <sstream>
#include <iostream>
#include <iomanip>
using std::ostringstream;
using std::endl;
using std::setw;
using std::right;
#include "ExitCodes.hpp"
#include "SerialPortUnix.hpp"
#include "Logger.hpp"
#include "ExitException.hpp"
#define DEFAULT_SERIAL_SPEED "19200"
CSerialPortUnix::CSerialPortUnix()
{
mSerialPortFd = -1;
mPortName = "";
// Construct vector of available system baudrates
#ifdef B50
mBaudrates.push_back(pair<string, speed_t>("50", B50));
#endif
#ifdef B75
mBaudrates.push_back(pair<string, speed_t>("75", B75));
#endif
#ifdef B110
mBaudrates.push_back(pair<string, speed_t>("110", B110));
#endif
#ifdef B134
mBaudrates.push_back(pair<string, speed_t>("134", B134));
#endif
#ifdef B150
mBaudrates.push_back(pair<string, speed_t>("150", B150));
#endif
#ifdef B200
mBaudrates.push_back(pair<string, speed_t>("200", B200));
#endif
#ifdef B300
mBaudrates.push_back(pair<string, speed_t>("300", B300));
#endif
#ifdef B600
mBaudrates.push_back(pair<string, speed_t>("600", B600));
#endif
#ifdef B1200
mBaudrates.push_back(pair<string, speed_t>("1200", B1200));
#endif
#ifdef B1800
mBaudrates.push_back(pair<string, speed_t>("1800", B1800));
#endif
#ifdef B2400
mBaudrates.push_back(pair<string, speed_t>("2400", B2400));
#endif
#ifdef B4800
mBaudrates.push_back(pair<string, speed_t>("4800", B4800));
#endif
#ifdef B9600
mBaudrates.push_back(pair<string, speed_t>("9600", B9600));
#endif
#ifdef B19200
mBaudrates.push_back(pair<string, speed_t>("19200", B19200));
#endif
#ifdef B38400
mBaudrates.push_back(pair<string, speed_t>("38400", B38400));
#endif
#ifdef B57600
mBaudrates.push_back(pair<string, speed_t>("57600", B57600));
#endif
#ifdef B115200
mBaudrates.push_back(pair<string, speed_t>("115200", B115200));
#endif
#ifdef B230400
mBaudrates.push_back(pair<string, speed_t>("230400", B230400));
#endif
}
CSerialPortUnix::~CSerialPortUnix()
{
;
}
void
CSerialPortUnix::openPort(string portName)
{
if (mSerialPortFd == -1) {
mSerialPortFd = ::open(portName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
if (mSerialPortFd == -1)
CLogger::error("Cannot open serial port " + portName, EXIT_SERIAL_PORT);
mPortName = portName;
}
}
void
CSerialPortUnix::open(string portName, string speed)
{
this->setDefaultTimeout();
openPort(portName);
// Set parameters of serial communication
pair<string, speed_t> s = findSpeed(speed, getDeviceSpeeds());
setSpeed(s);
struct termios options;
tcgetattr(mSerialPortFd, &options);
// Control options
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
// Turn off hardware flow controll
options.c_cflag &= ~CRTSCTS;
// Input Options - Turn off software flow controll, and CR <-> LF mapping
options.c_iflag &= ~(IXON | IXOFF | IXANY | INLCR | ICRNL);
// Line options - Raw input
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
// Raw output
options.c_oflag &= ~OPOST;
tcsetattr(mSerialPortFd, TCSANOW, &options);
// Blocking read
fcntl(mSerialPortFd, F_SETFL, 0);
CLogger::info("Serial port " + mPortName + " opened at speed " + s.first + " Bd");
}
void
CSerialPortUnix::close()
{
// Close only valid descriptor
if (mSerialPortFd != -1) {
if (::close(mSerialPortFd) == -1)
CLogger::error("Cannot close serial port", EXIT_SERIAL_PORT);
mSerialPortFd = -1;
mPortName = "";
}
}
vector<pair<string, speed_t>>
CSerialPortUnix::getDeviceSpeeds()
{
vector<pair<string, speed_t>> ds;
vector<pair<string, speed_t>>::const_iterator it;
// Test which baudrates are supported by underlying device
for (it = mBaudrates.begin(); it != mBaudrates.end(); ++it) {
// Try to set the baudrate
struct termios options;
if (tcgetattr(mSerialPortFd, &options) != 0)
CLogger::error("Cannot get attributes of serial port " + mPortName, EXIT_SERIAL_PORT);
if (!cfsetispeed(&options, it->second)
&& !cfsetospeed(&options, it->second)
&& !tcsetattr(mSerialPortFd, TCSANOW, &options)) {
ds.push_back(*it);
}
}
return ds;
}
string
CSerialPortUnix::getSpeeds(string portName)
{
ostringstream os;
int c;
vector<pair<string, speed_t>> s;
vector<pair<string, speed_t>>::const_iterator it;
openPort(portName);
s = getDeviceSpeeds();
for (c = 0, it = s.begin(); it != s.end(); ++c, ++it)
os << setw(7) << right << it->first << " Bd" << endl;
// Close serial port
close();
if (c == 0)
CLogger::error("Serial port device does not support any baudrates", EXIT_SERIAL_PORT);
return os.str();
}
pair<string, speed_t>
CSerialPortUnix::findSpeed(string speed, const vector<pair<string, speed_t>> & list)
{
vector<pair<string, speed_t>>::const_iterator it;
vector<pair<string, speed_t>>::const_iterator defit;
bool foundDef = false;
for (it = list.begin(); it != list.end(); ++it) {
if (!(it->first).compare(speed))
return *it; // Exact match
else if (!(it->first).compare(DEFAULT_SERIAL_SPEED)) {
defit = it; // We have found default serial speed
foundDef = true;
}
}
if (foundDef)
// We have not found exact speed and default speed. Choose
// highest supported.
return *defit;
return *(it - 1);
}
void
CSerialPortUnix::setSpeed(pair<string, speed_t> speed)
{
struct termios options;
if (tcgetattr(mSerialPortFd, &options)
|| cfsetispeed(&options, speed.second)
|| cfsetospeed(&options, speed.second)
|| tcsetattr(mSerialPortFd, TCSANOW, &options)) {
CLogger::error("Cannot set serial speed: " + speed.first + ": " + strerror(errno), EXIT_SERIAL_PORT);
}
}
ssize_t
CSerialPortUnix::writeSingle(uint8_t *data, int data_length)
{
ssize_t r = ::write(mSerialPortFd, data, data_length);
if (r <= 0) {
ostringstream os;
os << "Cannot write to serial port";
if (r < 0)
os << ": " << string(strerror(errno));
CLogger::error(os.str(), EXIT_SERIAL_PORT);
}
return r;
}
ssize_t
CSerialPortUnix::readSingle(uint8_t *data, int data_length)
{
ssize_t r = 0;
int s;
fd_set read_fds, write_fds, except_fds;
struct timeval timeout;
// Renew file descriptor sets
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_ZERO(&except_fds);
FD_SET(mSerialPortFd, &read_fds);
// Set timeout
timeout.tv_sec = mReadTimeoutMs / 1000;
timeout.tv_usec = 0;
// Wait for event
s = select(mSerialPortFd + 1, &read_fds, &write_fds, &except_fds, &timeout);
if (s == 1) {
// One descriptor changed, ready to read
r = ::read(mSerialPortFd, data, data_length);
} else if (s == 0) {
// Timeout occured
CLogger::error("Timeout occured while reading data from serial port", EXIT_SERIAL_PORT);
}
if ((s < 0) || (r <= 0)) {
// Error occured in select or read
ostringstream os;
os << "Cannot read from serial port";
if (r < 0) {
os << ": " << strerror(errno);
CLogger::error(os.str(), EXIT_SERIAL_PORT);
}
}
return r;
}
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