MMDVMHost-Private/SerialController.cpp

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/*
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* Copyright (C) 2002-2004,2007-2011,2013,2014-2016 by Jonathan Naylor G4KLX
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* Copyright (C) 1999-2001 by Thomas Sailor HB9JNX
*
* 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 "SerialController.h"
#include "Log.h"
#include <cassert>
#include <sys/types.h>
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#if defined(_WIN32) || defined(_WIN64)
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#include <setupapi.h>
#include <winioctl.h>
#else
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <cerrno>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#endif
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#if defined(_WIN32) || defined(_WIN64)
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const unsigned int BUFFER_LENGTH = 1000U;
CSerialController::CSerialController(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
m_device(device),
m_speed(speed),
m_assertRTS(assertRTS),
m_handle(INVALID_HANDLE_VALUE),
m_readOverlapped(),
m_writeOverlapped(),
m_readBuffer(NULL),
m_readLength(0U),
m_readPending(false)
{
assert(!device.empty());
m_readBuffer = new unsigned char[BUFFER_LENGTH];
}
CSerialController::~CSerialController()
{
delete[] m_readBuffer;
}
bool CSerialController::open()
{
assert(m_handle == INVALID_HANDLE_VALUE);
DWORD errCode;
std::string baseName = m_device.substr(4U); // Convert "\\.\COM10" to "COM10"
m_handle = ::CreateFileA(m_device.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
if (m_handle == INVALID_HANDLE_VALUE) {
LogError("Cannot open device - %s, err=%04lx", m_device.c_str(), ::GetLastError());
return false;
}
DCB dcb;
if (::GetCommState(m_handle, &dcb) == 0) {
LogError("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.fDtrControl = DTR_CONTROL_DISABLE;
dcb.fRtsControl = RTS_CONTROL_DISABLE;
if (::SetCommState(m_handle, &dcb) == 0) {
LogError("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("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("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("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("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);
::memset(&m_readOverlapped, 0x00U, sizeof(OVERLAPPED));
::memset(&m_writeOverlapped, 0x00U, sizeof(OVERLAPPED));
m_readOverlapped.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
m_writeOverlapped.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
m_readLength = 0U;
m_readPending = false;
::memset(m_readBuffer, 0x00U, BUFFER_LENGTH);
return true;
}
int CSerialController::read(unsigned char* buffer, unsigned int length)
{
assert(m_handle != INVALID_HANDLE_VALUE);
assert(buffer != NULL);
unsigned int 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);
}
int CSerialController::readNonblock(unsigned char* buffer, unsigned int length)
{
assert(m_handle != INVALID_HANDLE_VALUE);
assert(buffer != NULL);
if (length > BUFFER_LENGTH)
length = BUFFER_LENGTH;
if (m_readPending && length != m_readLength) {
::CancelIo(m_handle);
m_readPending = false;
}
m_readLength = length;
if (length == 0U)
return 0;
if (!m_readPending) {
DWORD bytes = 0UL;
BOOL res = ::ReadFile(m_handle, m_readBuffer, m_readLength, &bytes, &m_readOverlapped);
if (res) {
::memcpy(buffer, m_readBuffer, bytes);
return int(bytes);
}
DWORD error = ::GetLastError();
if (error != ERROR_IO_PENDING) {
LogError("Error from ReadFile: %04lx", error);
return -1;
}
m_readPending = true;
}
BOOL res = HasOverlappedIoCompleted(&m_readOverlapped);
if (!res)
return 0;
DWORD bytes = 0UL;
res = ::GetOverlappedResult(m_handle, &m_readOverlapped, &bytes, TRUE);
if (!res) {
LogError("Error from GetOverlappedResult (ReadFile): %04lx", ::GetLastError());
return -1;
}
::memcpy(buffer, m_readBuffer, bytes);
m_readPending = false;
return int(bytes);
}
int CSerialController::write(const unsigned char* buffer, unsigned int length)
{
assert(m_handle != INVALID_HANDLE_VALUE);
assert(buffer != NULL);
if (length == 0U)
return 0;
unsigned int ptr = 0U;
while (ptr < length) {
DWORD bytes = 0UL;
BOOL res = ::WriteFile(m_handle, buffer + ptr, length - ptr, &bytes, &m_writeOverlapped);
if (!res) {
DWORD error = ::GetLastError();
if (error != ERROR_IO_PENDING) {
LogError("Error from WriteFile: %04lx", error);
return -1;
}
res = ::GetOverlappedResult(m_handle, &m_writeOverlapped, &bytes, TRUE);
if (!res) {
LogError("Error from GetOverlappedResult (WriteFile): %04lx", ::GetLastError());
return -1;
}
}
ptr += bytes;
}
return int(length);
}
void CSerialController::close()
{
assert(m_handle != INVALID_HANDLE_VALUE);
::CloseHandle(m_handle);
m_handle = INVALID_HANDLE_VALUE;
::CloseHandle(m_readOverlapped.hEvent);
::CloseHandle(m_writeOverlapped.hEvent);
}
#else
CSerialController::CSerialController(const std::string& device, SERIAL_SPEED speed, bool assertRTS) :
m_device(device),
m_speed(speed),
m_assertRTS(assertRTS),
m_fd(-1)
{
assert(!device.empty());
}
CSerialController::~CSerialController()
{
}
bool CSerialController::open()
{
assert(m_fd == -1);
m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NDELAY, 0);
if (m_fd < 0) {
LogError("Cannot open device - %s", m_device.c_str());
return false;
}
if (::isatty(m_fd) == 0) {
LogError("%s is not a TTY device", m_device.c_str());
::close(m_fd);
return false;
}
termios termios;
if (::tcgetattr(m_fd, &termios) < 0) {
LogError("Cannot get the attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
termios.c_lflag &= ~(ECHO | ECHOE | ICANON | IEXTEN | ISIG);
termios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON | IXOFF | IXANY);
termios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CRTSCTS);
termios.c_cflag |= CS8;
termios.c_oflag &= ~(OPOST);
termios.c_cc[VMIN] = 0;
termios.c_cc[VTIME] = 10;
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;
default:
LogError("Unsupported serial port speed - %d", int(m_speed));
::close(m_fd);
return false;
}
if (::tcsetattr(m_fd, TCSANOW, &termios) < 0) {
LogError("Cannot set the attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
if (m_assertRTS) {
unsigned int y;
if (::ioctl(m_fd, TIOCMGET, &y) < 0) {
LogError("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("Cannot set the control attributes for %s", m_device.c_str());
::close(m_fd);
return false;
}
}
return true;
}
int CSerialController::read(unsigned char* buffer, unsigned int length)
{
assert(buffer != NULL);
assert(m_fd != -1);
if (length == 0U)
return 0;
unsigned int 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("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("Error from read(), errno=%d", errno);
return -1;
}
}
if (len > 0)
offset += len;
}
}
return length;
}
int CSerialController::write(const unsigned char* buffer, unsigned int length)
{
assert(buffer != NULL);
assert(m_fd != -1);
if (length == 0U)
return 0;
unsigned int ptr = 0U;
while (ptr < length) {
ssize_t n = ::write(m_fd, buffer + ptr, length - ptr);
if (n < 0) {
if (errno != EAGAIN) {
LogError("Error returned from write(), errno=%d", errno);
return -1;
}
}
if (n > 0)
ptr += n;
}
return length;
}
void CSerialController::close()
{
assert(m_fd != -1);
::close(m_fd);
m_fd = -1;
}
#endif