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403 lines
9.7 KiB
403 lines
9.7 KiB
/*
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* Copyright (C) 2002-2004,2007-2011,2013,2014,2015,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 1999-2001 by Thomas Sailor HB9JNX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "SerialDataController.h"
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#if !defined(_WIN32)
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <cerrno>
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#include <fcntl.h>
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#include <unistd.h>
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#include <termios.h>
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#endif
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#if !defined(_WIN32)
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CSerialDataController::CSerialDataController(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
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m_device(device),
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m_speed(speed),
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m_assertRTS(assertRTS),
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m_fd(-1)
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{
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assert(!device.empty());
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}
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CSerialDataController::~CSerialDataController()
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{
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}
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bool CSerialDataController::open()
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{
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assert(m_fd == -1);
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m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NDELAY, 0);
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if (m_fd < 0) {
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::fprintf(stderr, "Cannot open device - %s\n", m_device.c_str());
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return false;
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}
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if (::isatty(m_fd) == 0) {
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::fprintf(stderr, "%s is not a TTY device\n", m_device.c_str());
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::close(m_fd);
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return false;
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}
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termios termios;
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if (::tcgetattr(m_fd, &termios) < 0) {
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::fprintf(stderr, "Cannot get the attributes for %s\n", m_device.c_str());
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::close(m_fd);
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return false;
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}
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termios.c_lflag &= ~(ECHO | ECHOE | ICANON | IEXTEN | ISIG);
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termios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON | IXOFF | IXANY);
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termios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CRTSCTS);
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termios.c_cflag |= CS8;
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termios.c_oflag &= ~(OPOST);
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termios.c_cc[VMIN] = 0;
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termios.c_cc[VTIME] = 10;
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switch (m_speed) {
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case SERIAL_1200:
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::cfsetospeed(&termios, B1200);
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::cfsetispeed(&termios, B1200);
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break;
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case SERIAL_2400:
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::cfsetospeed(&termios, B2400);
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::cfsetispeed(&termios, B2400);
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break;
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case SERIAL_4800:
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::cfsetospeed(&termios, B4800);
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::cfsetispeed(&termios, B4800);
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break;
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case SERIAL_9600:
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::cfsetospeed(&termios, B9600);
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::cfsetispeed(&termios, B9600);
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break;
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case SERIAL_19200:
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::cfsetospeed(&termios, B19200);
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::cfsetispeed(&termios, B19200);
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break;
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case SERIAL_38400:
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::cfsetospeed(&termios, B38400);
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::cfsetispeed(&termios, B38400);
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break;
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case SERIAL_115200:
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::cfsetospeed(&termios, B115200);
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::cfsetispeed(&termios, B115200);
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break;
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case SERIAL_230400:
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::cfsetospeed(&termios, B230400);
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::cfsetispeed(&termios, B230400);
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break;
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default:
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::fprintf(stderr, "Unsupported serial port speed - %d\n", int(m_speed));
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::close(m_fd);
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return false;
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}
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if (::tcsetattr(m_fd, TCSANOW, &termios) < 0) {
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::fprintf(stderr, "Cannot set the attributes for %s\n", m_device.c_str());
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::close(m_fd);
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return false;
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}
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if (m_assertRTS) {
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unsigned int y;
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if (::ioctl(m_fd, TIOCMGET, &y) < 0) {
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::fprintf(stderr, "Cannot get the control attributes for %s\n", m_device.c_str());
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::close(m_fd);
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return false;
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}
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y |= TIOCM_RTS;
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if (::ioctl(m_fd, TIOCMSET, &y) < 0) {
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::fprintf(stderr, "Cannot set the control attributes for %s\n", m_device.c_str());
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::close(m_fd);
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return false;
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}
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}
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return true;
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}
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int CSerialDataController::read(unsigned char* buffer, unsigned int length, unsigned int timeout)
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{
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assert(buffer != nullptr);
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assert(m_fd != -1);
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if (length == 0U)
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return 0;
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unsigned int offset = 0U;
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while (offset < length) {
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(m_fd, &fds);
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int n;
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if (offset == 0U) {
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struct timeval tv;
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tv.tv_sec = timeout / 1000U;
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tv.tv_usec = (timeout % 1000U) * 1000U;
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n = ::select(m_fd + 1, &fds, nullptr, nullptr, &tv);
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if (n == 0)
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return 0;
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} else {
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n = ::select(m_fd + 1, &fds, nullptr, nullptr, nullptr);
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}
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if (n < 0) {
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::fprintf(stderr, "Error from select(), errno=%d\n", errno);
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return -1;
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}
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if (n > 0) {
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ssize_t len = ::read(m_fd, buffer + offset, length - offset);
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if (len < 0) {
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if (errno != EAGAIN) {
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::fprintf(stderr, "Error from read(), errno=%d\n", errno);
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return -1;
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}
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}
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if (len > 0)
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offset += len;
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}
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}
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return length;
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}
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int CSerialDataController::write(const unsigned char* buffer, unsigned int length)
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{
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assert(buffer != nullptr);
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assert(m_fd != -1);
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if (length == 0U)
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return 0;
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unsigned int ptr = 0U;
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while (ptr < length) {
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ssize_t n = ::write(m_fd, buffer + ptr, length - ptr);
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if (n < 0) {
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if (errno != EAGAIN) {
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::fprintf(stderr, "Error returned from write(), errno=%d\n", errno);
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return -1;
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}
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}
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if (n > 0)
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ptr += n;
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}
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return length;
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}
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void CSerialDataController::close()
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{
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assert(m_fd != -1);
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::close(m_fd);
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m_fd = -1;
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}
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#else // _WIN32
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CSerialDataController::CSerialDataController(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
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m_device(device),
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m_speed(speed),
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m_assertRTS(assertRTS),
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m_handle(INVALID_HANDLE_VALUE)
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{
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assert(!device.empty());
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}
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CSerialDataController::~CSerialDataController()
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{
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}
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bool CSerialDataController::open()
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{
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assert(m_handle == INVALID_HANDLE_VALUE);
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// On Windows, ports above COM9 require the \\.\COMn prefix.
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std::string path = "\\\\.\\" + m_device;
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m_handle = ::CreateFileA(path.c_str(),
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GENERIC_READ | GENERIC_WRITE,
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0,
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nullptr,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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nullptr);
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if (m_handle == INVALID_HANDLE_VALUE) {
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::fprintf(stderr, "Cannot open device - %s\n", m_device.c_str());
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return false;
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}
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DCB dcb;
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::memset(&dcb, 0, sizeof(DCB));
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dcb.DCBlength = sizeof(DCB);
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if (!::GetCommState(m_handle, &dcb)) {
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::fprintf(stderr, "Cannot get the attributes for %s\n", m_device.c_str());
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::CloseHandle(m_handle);
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m_handle = INVALID_HANDLE_VALUE;
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return false;
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}
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dcb.BaudRate = static_cast<DWORD>(m_speed);
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dcb.ByteSize = 8;
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dcb.Parity = NOPARITY;
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dcb.StopBits = ONESTOPBIT;
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dcb.fBinary = TRUE;
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dcb.fParity = FALSE;
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dcb.fOutxCtsFlow = FALSE;
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dcb.fOutxDsrFlow = FALSE;
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dcb.fDtrControl = DTR_CONTROL_DISABLE;
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dcb.fRtsControl = RTS_CONTROL_DISABLE;
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dcb.fOutX = FALSE;
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dcb.fInX = FALSE;
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if (!::SetCommState(m_handle, &dcb)) {
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::fprintf(stderr, "Cannot set the attributes for %s\n", m_device.c_str());
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::CloseHandle(m_handle);
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m_handle = INVALID_HANDLE_VALUE;
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return false;
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}
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// Use infinite inter-character timeout; per-read timeout set in read().
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COMMTIMEOUTS timeouts;
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::memset(&timeouts, 0, sizeof(COMMTIMEOUTS));
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timeouts.ReadIntervalTimeout = 0;
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timeouts.ReadTotalTimeoutMultiplier = 0;
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timeouts.ReadTotalTimeoutConstant = 0;
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timeouts.WriteTotalTimeoutMultiplier = 0;
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timeouts.WriteTotalTimeoutConstant = 0;
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if (!::SetCommTimeouts(m_handle, &timeouts)) {
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::fprintf(stderr, "Cannot set the timeouts for %s\n", m_device.c_str());
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::CloseHandle(m_handle);
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m_handle = INVALID_HANDLE_VALUE;
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return false;
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}
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if (m_assertRTS) {
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if (!::EscapeCommFunction(m_handle, SETRTS)) {
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::fprintf(stderr, "Cannot set RTS for %s\n", m_device.c_str());
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::CloseHandle(m_handle);
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m_handle = INVALID_HANDLE_VALUE;
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return false;
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}
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}
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return true;
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}
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int CSerialDataController::read(unsigned char* buffer, unsigned int length, unsigned int timeout)
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{
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assert(buffer != nullptr);
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assert(m_handle != INVALID_HANDLE_VALUE);
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if (length == 0U)
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return 0;
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unsigned int offset = 0U;
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// Apply the caller's timeout to the first byte only.
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COMMTIMEOUTS timeouts;
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::memset(&timeouts, 0, sizeof(COMMTIMEOUTS));
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timeouts.ReadIntervalTimeout = 0;
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timeouts.ReadTotalTimeoutMultiplier = 0;
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timeouts.ReadTotalTimeoutConstant = (offset == 0U) ? static_cast<DWORD>(timeout) : MAXDWORD;
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timeouts.WriteTotalTimeoutMultiplier = 0;
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timeouts.WriteTotalTimeoutConstant = 0;
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::SetCommTimeouts(m_handle, &timeouts);
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while (offset < length) {
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if (offset == 1U) {
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// After the first byte arrives, block indefinitely for the rest.
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timeouts.ReadTotalTimeoutConstant = MAXDWORD;
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::SetCommTimeouts(m_handle, &timeouts);
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}
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DWORD bytesRead = 0U;
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BOOL ok = ::ReadFile(m_handle,
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buffer + offset,
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length - offset,
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&bytesRead,
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nullptr);
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if (!ok) {
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::fprintf(stderr, "Error from ReadFile(), error=%lu\n", ::GetLastError());
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return -1;
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}
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if (bytesRead == 0U && offset == 0U)
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return 0; // timeout on first byte
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offset += bytesRead;
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}
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return static_cast<int>(length);
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}
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int CSerialDataController::write(const unsigned char* buffer, unsigned int length)
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{
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assert(buffer != nullptr);
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assert(m_handle != INVALID_HANDLE_VALUE);
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if (length == 0U)
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return 0;
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unsigned int ptr = 0U;
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while (ptr < length) {
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DWORD bytesWritten = 0U;
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BOOL ok = ::WriteFile(m_handle,
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buffer + ptr,
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length - ptr,
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&bytesWritten,
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nullptr);
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if (!ok) {
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::fprintf(stderr, "Error returned from WriteFile(), error=%lu\n", ::GetLastError());
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return -1;
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}
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ptr += bytesWritten;
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}
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return static_cast<int>(length);
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}
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void CSerialDataController::close()
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{
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assert(m_handle != INVALID_HANDLE_VALUE);
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::CloseHandle(m_handle);
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m_handle = INVALID_HANDLE_VALUE;
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}
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#endif // _WIN32
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