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dvmhost/modem/port/UARTPort.cpp

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/**
* Digital Voice Modem - Host Software
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* @package DVM / Host Software
*
*/
//
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
//
/*
* Copyright (C) 2002-2004,2007-2011,2013,2014-2017,2019,2020,2021 by Jonathan Naylor G4KLX
* Copyright (C) 1999-2001 by Thomas Sailor HB9JNX
* Copyright (C) 2020-2021 by Bryan Biedenkapp N2PLL
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Defines.h"
#include "modem/port/UARTPort.h"
#include "Log.h"
using namespace modem::port;
#include <cstring>
#include <cassert>
#include <sys/types.h>
#if defined(_WIN32) || defined(_WIN64)
#include <setupapi.h>
#include <winioctl.h>
#else
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <cerrno>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#endif
// ---------------------------------------------------------------------------
// Public Class Members
// ---------------------------------------------------------------------------
#if defined(_WIN32) || defined(_WIN64)
/// <summary>
/// Initializes a new instance of the UARTPort class.
/// </summary>
/// <param name="device">Serial port device.</param>
/// <param name="speed">Serial port speed.</param>
/// <param name="assertRTS"></param>
UARTPort::UARTPort(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
m_isOpen(false),
m_device(device),
m_speed(speed),
m_assertRTS(assertRTS),
m_handle(INVALID_HANDLE_VALUE)
{
assert(!device.empty());
}
/// <summary>
/// Finalizes a instance of the UARTPort class.
/// </summary>
UARTPort::~UARTPort()
{
/* stub */
}
/// <summary>
/// Opens a connection to the serial port.
/// </summary>
/// <returns>True, if connection is opened, otherwise false.</returns>
bool UARTPort::open()
{
if (m_isOpen)
return true;
assert(m_handle == INVALID_HANDLE_VALUE);
DWORD errCode;
// Convert "\\.\COM10" to "COM10"
std::string baseName = m_device.substr(4U);
m_handle = ::CreateFileA(m_device.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (m_handle == INVALID_HANDLE_VALUE) {
::LogError(LOG_HOST, "Cannot open device - %s, err=%04lx", m_device.c_str(), ::GetLastError());
return false;
}
DCB dcb;
if (::GetCommState(m_handle, &dcb) == 0) {
::LogError(LOG_HOST, "Cannot get the attributes for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
dcb.BaudRate = DWORD(m_speed);
dcb.ByteSize = 8;
dcb.Parity = NOPARITY;
dcb.fParity = FALSE;
dcb.StopBits = ONESTOPBIT;
dcb.fInX = FALSE;
dcb.fOutX = FALSE;
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDsrSensitivity = FALSE;
dcb.fDtrControl = DTR_CONTROL_DISABLE;
dcb.fRtsControl = RTS_CONTROL_DISABLE;
if (::SetCommState(m_handle, &dcb) == 0) {
::LogError(LOG_HOST, "Cannot set the attributes for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
COMMTIMEOUTS timeouts;
if (!::GetCommTimeouts(m_handle, &timeouts)) {
::LogError(LOG_HOST, "Cannot get the timeouts for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
timeouts.ReadIntervalTimeout = MAXDWORD;
timeouts.ReadTotalTimeoutMultiplier = 0UL;
timeouts.ReadTotalTimeoutConstant = 0UL;
if (!::SetCommTimeouts(m_handle, &timeouts)) {
::LogError(LOG_HOST, "Cannot set the timeouts for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
if (::EscapeCommFunction(m_handle, CLRDTR) == 0) {
::LogError(LOG_HOST, "Cannot clear DTR for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
if (::EscapeCommFunction(m_handle, m_assertRTS ? SETRTS : CLRRTS) == 0) {
::LogError(LOG_HOST, "Cannot set/clear RTS for %s, err=%04lx", m_device.c_str(), ::GetLastError());
::ClearCommError(m_handle, &errCode, NULL);
::CloseHandle(m_handle);
return false;
}
::ClearCommError(m_handle, &errCode, NULL);
m_isOpen = true;
return true;
}
/// <summary>
/// Reads data from the serial port.
/// </summary>
/// <param name="buffer">Buffer to read data from the serial port to.</param>
/// <param name="length">Length of data to read from the serial port.</param>
/// <returns>Actual length of data read from serial port.</returns>
int UARTPort::read(uint8_t* buffer, uint32_t length)
{
assert(m_handle != INVALID_HANDLE_VALUE);
assert(buffer != NULL);
uint32_t ptr = 0U;
while (ptr < length) {
int ret = readNonblock(buffer + ptr, length - ptr);
if (ret < 0) {
return ret;
}
else if (ret == 0) {
if (ptr == 0U)
return 0;
}
else {
ptr += ret;
}
}
return int(length);
}
/// <summary>
/// Writes data to the serial port.
/// </summary>
/// <param name="buffer">Buffer containing data to write to serial port.</param>
/// <param name="length">Length of data to write to serial port.</param>
/// <returns>Actual length of data written to the serial port.</returns>
int UARTPort::write(const uint8_t* buffer, uint32_t length)
{
assert(buffer != NULL);
if (m_isOpen && m_handle == INVALID_HANDLE_VALUE)
return 0;
assert(m_handle != INVALID_HANDLE_VALUE);
if (length == 0U)
return 0;
uint32_t ptr = 0U;
while (ptr < length) {
DWORD bytes = 0UL;
BOOL ret = ::WriteFile(m_handle, buffer + ptr, length - ptr, &bytes, NULL);
if (!ret) {
::LogError(LOG_HOST, "Error from WriteFile for %s: %04lx", m_device.c_str(), ::GetLastError());
return -1;
}
ptr += bytes;
}
return int(length);
}
/// <summary>
/// Closes the connection to the serial port.
/// </summary>
void UARTPort::close()
{
if (!m_isOpen && m_handle == INVALID_HANDLE_VALUE)
return;
assert(m_handle != INVALID_HANDLE_VALUE);
::CloseHandle(m_handle);
m_handle = INVALID_HANDLE_VALUE;
m_isOpen = false;
}
#else
/// <summary>
/// Initializes a new instance of the UARTPort class.
/// </summary>
/// <param name="device">Serial port device.</param>
/// <param name="speed">Serial port speed.</param>
/// <param name="assertRTS"></param>
UARTPort::UARTPort(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
m_isOpen(false),
m_device(device),
m_speed(speed),
m_assertRTS(assertRTS),
m_fd(-1)
{
assert(!device.empty());
}
/// <summary>
/// Finalizes a instance of the UARTPort class.
/// </summary>
UARTPort::~UARTPort()
{
}
/// <summary>
/// Opens a connection to the serial port.
/// </summary>
/// <returns>True, if connection is opened, otherwise false.</returns>
bool UARTPort::open()
{
if (m_isOpen)
return true;
assert(m_fd == -1);
#if defined(__APPLE__)
m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK); /*open in block mode under OSX*/
#else
m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NDELAY, 0);
#endif
if (m_fd < 0) {
::LogError(LOG_HOST, "Cannot open device - %s", m_device.c_str());
return false;
}
if (::isatty(m_fd) == 0) {
LogError(LOG_HOST, "%s is not a TTY device", m_device.c_str());
::close(m_fd);
return false;
}
termios termios;
if (::tcgetattr(m_fd, &termios) < 0) {
::LogError(LOG_HOST, "Cannot get the attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
termios.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK);
termios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL);
termios.c_iflag &= ~(IXON | IXOFF | IXANY);
termios.c_oflag &= ~(OPOST);
termios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CRTSCTS);
termios.c_cflag |= (CS8 | CLOCAL | CREAD);
termios.c_lflag &= ~(ISIG | ICANON | IEXTEN);
termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
#if defined(__APPLE__)
termios.c_cc[VMIN] = 1;
termios.c_cc[VTIME] = 1;
#else
termios.c_cc[VMIN] = 0;
termios.c_cc[VTIME] = 10;
#endif
switch (m_speed) {
case SERIAL_1200:
::cfsetospeed(&termios, B1200);
::cfsetispeed(&termios, B1200);
break;
case SERIAL_2400:
::cfsetospeed(&termios, B2400);
::cfsetispeed(&termios, B2400);
break;
case SERIAL_4800:
::cfsetospeed(&termios, B4800);
::cfsetispeed(&termios, B4800);
break;
case SERIAL_9600:
::cfsetospeed(&termios, B9600);
::cfsetispeed(&termios, B9600);
break;
case SERIAL_19200:
::cfsetospeed(&termios, B19200);
::cfsetispeed(&termios, B19200);
break;
case SERIAL_38400:
::cfsetospeed(&termios, B38400);
::cfsetispeed(&termios, B38400);
break;
case SERIAL_115200:
::cfsetospeed(&termios, B115200);
::cfsetispeed(&termios, B115200);
break;
case SERIAL_230400:
::cfsetospeed(&termios, B230400);
::cfsetispeed(&termios, B230400);
break;
case SERIAL_460800:
::cfsetospeed(&termios, B460800);
::cfsetispeed(&termios, B460800);
break;
default:
::LogError(LOG_HOST, "Unsupported serial port speed - %u", m_speed);
::close(m_fd);
return false;
}
if (::tcsetattr(m_fd, TCSANOW, &termios) < 0) {
::LogError(LOG_HOST, "Cannot set the attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
if (m_assertRTS) {
uint32_t y;
if (::ioctl(m_fd, TIOCMGET, &y) < 0) {
::LogError(LOG_HOST, "Cannot get the control attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
y |= TIOCM_RTS;
if (::ioctl(m_fd, TIOCMSET, &y) < 0) {
::LogError(LOG_HOST, "Cannot set the control attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
}
#if defined(__APPLE__)
setNonblock(false);
#endif
m_isOpen = true;
return true;
}
/// <summary>
/// Reads data from the serial port.
/// </summary>
/// <param name="buffer">Buffer to read data from the serial port to.</param>
/// <param name="length">Length of data to read from the serial port.</param>
/// <returns>Actual length of data read from serial port.</returns>
int UARTPort::read(uint8_t* buffer, uint32_t length)
{
assert(buffer != NULL);
assert(m_fd != -1);
if (length == 0U)
return 0;
uint32_t offset = 0U;
while (offset < length) {
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_fd, &fds);
int n;
if (offset == 0U) {
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
n = ::select(m_fd + 1, &fds, NULL, NULL, &tv);
if (n == 0)
return 0;
}
else {
n = ::select(m_fd + 1, &fds, NULL, NULL, NULL);
}
if (n < 0) {
::LogError(LOG_HOST, "Error from select(), errno=%d", errno);
return -1;
}
if (n > 0) {
ssize_t len = ::read(m_fd, buffer + offset, length - offset);
if (len < 0) {
if (errno != EAGAIN) {
::LogError(LOG_HOST, "Error from read(), errno=%d", errno);
return -1;
}
}
if (len > 0)
offset += len;
}
}
return length;
}
/// <summary>
/// Writes data to the serial port.
/// </summary>
/// <param name="buffer">Buffer containing data to write to serial port.</param>
/// <param name="length">Length of data to write to serial port.</param>
/// <returns>Actual length of data written to the serial port.</returns>
int UARTPort::write(const uint8_t* buffer, uint32_t length)
{
assert(buffer != NULL);
if (m_isOpen && m_fd == -1)
return 0;
assert(m_fd != -1);
if (length == 0U)
return 0;
uint32_t ptr = 0U;
while (ptr < length) {
ssize_t n = 0U;
if (canWrite())
n = ::write(m_fd, buffer + ptr, length - ptr);
if (n < 0) {
if (errno != EAGAIN) {
::LogError(LOG_HOST, "Error returned from write(), errno=%d", errno);
return -1;
}
}
if (n > 0)
ptr += n;
}
return length;
}
/// <summary>
/// Closes the connection to the serial port.
/// </summary>
void UARTPort::close()
{
if (!m_isOpen && m_fd == -1)
return;
assert(m_fd != -1);
::close(m_fd);
m_fd = -1;
m_isOpen = false;
}
#if defined(__APPLE__)
/// <summary>
///
/// </summary>
/// <returns></returns>
int UARTPort::setNonblock(bool nonblock)
{
int flag = ::fcntl(m_fd, F_GETFD, 0);
if (nonblock)
flag |= O_NONBLOCK;
else
flag &= ~O_NONBLOCK;
return ::fcntl(m_fd, F_SETFL, flag);
}
#endif
#endif
// ---------------------------------------------------------------------------
// Private Class Members
// ---------------------------------------------------------------------------
#if defined(_WIN32) || defined(_WIN64)
/// <summary>
///
/// </summary>
/// <param name="buffer"></param>
/// <param name="length"></param>
/// <returns></returns>
int UARTPort::readNonblock(uint8_t* buffer, uint32_t length)
{
assert(m_handle != INVALID_HANDLE_VALUE);
assert(buffer != NULL);
if (length == 0U)
return 0;
DWORD errors;
COMSTAT status;
if (::ClearCommError(m_handle, &errors, &status) == 0) {
::LogError(LOG_HOST, "Error from ClearCommError for %s, err=%04lx", m_device.c_str(), ::GetLastError());
return -1;
}
if (status.cbInQue == 0UL)
return 0;
DWORD readLength = status.cbInQue;
if (length < readLength)
readLength = length;
DWORD bytes = 0UL;
BOOL ret = ::ReadFile(m_handle, buffer, readLength, &bytes, NULL);
if (!ret) {
::LogError(LOG_HOST, "Error from ReadFile for %s: %04lx", m_device.c_str(), ::GetLastError());
return -1;
}
return int(bytes);
}
#else
/// <summary>
///
/// </summary>
/// <returns></returns>
bool UARTPort::canWrite()
{
#if defined(__APPLE__)
fd_set wset;
FD_ZERO(&wset);
FD_SET(m_fd, &wset);
struct timeval timeo;
timeo.tv_sec = 0;
timeo.tv_usec = 0;
int rc = ::select(m_fd + 1, NULL, &wset, NULL, &timeo);
if (rc > 0 && FD_ISSET(m_fd, &wset))
return true;
return false;
#else
return true;
#endif
}
#endif
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