468 lines
11 KiB
C++
468 lines
11 KiB
C++
/*
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* Copyright (C) 2002-2004,2007-2011,2013,2014,2015 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 "SerialController.h"
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#include "Log.h"
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#include <cassert>
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#include <sys/types.h>
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#if defined(WIN32)
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#include <setupapi.h>
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#include <winioctl.h>
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#else
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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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const unsigned int BUFFER_LENGTH = 1000U;
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CSerialController::CSerialController(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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m_readOverlapped(),
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m_writeOverlapped(),
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m_readBuffer(NULL),
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m_readLength(0U),
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m_readPending(false)
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{
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assert(!device.empty());
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m_readBuffer = new unsigned char[BUFFER_LENGTH];
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}
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CSerialController::~CSerialController()
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{
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delete[] m_readBuffer;
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}
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bool CSerialController::open()
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{
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assert(m_handle == INVALID_HANDLE_VALUE);
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DWORD errCode;
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std::string baseName = m_device.substr(4U); // Convert "\\.\COM10" to "COM10"
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m_handle = ::CreateFileA(m_device.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
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if (m_handle == INVALID_HANDLE_VALUE) {
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LogError("Cannot open device - %s, err=%04lx", m_device.c_str(), ::GetLastError());
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return false;
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}
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DCB dcb;
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if (::GetCommState(m_handle, &dcb) == 0) {
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LogError("Cannot get the attributes for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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dcb.BaudRate = DWORD(m_speed);
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dcb.ByteSize = 8;
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dcb.Parity = NOPARITY;
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dcb.fParity = FALSE;
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dcb.StopBits = ONESTOPBIT;
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dcb.fInX = FALSE;
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dcb.fOutX = 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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if (::SetCommState(m_handle, &dcb) == 0) {
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LogError("Cannot set the attributes for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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COMMTIMEOUTS timeouts;
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if (!::GetCommTimeouts(m_handle, &timeouts)) {
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LogError("Cannot get the timeouts for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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timeouts.ReadIntervalTimeout = MAXDWORD;
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timeouts.ReadTotalTimeoutMultiplier = 0UL;
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timeouts.ReadTotalTimeoutConstant = 0UL;
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if (!::SetCommTimeouts(m_handle, &timeouts)) {
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LogError("Cannot set the timeouts for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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if (::EscapeCommFunction(m_handle, CLRDTR) == 0) {
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LogError("Cannot clear DTR for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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if (::EscapeCommFunction(m_handle, m_assertRTS ? SETRTS : CLRRTS) == 0) {
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LogError("Cannot set/clear RTS for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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::ClearCommError(m_handle, &errCode, NULL);
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::CloseHandle(m_handle);
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return false;
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}
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::ClearCommError(m_handle, &errCode, NULL);
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::memset(&m_readOverlapped, 0x00U, sizeof(OVERLAPPED));
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::memset(&m_writeOverlapped, 0x00U, sizeof(OVERLAPPED));
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m_readOverlapped.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
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m_writeOverlapped.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
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m_readLength = 0U;
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m_readPending = false;
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::memset(m_readBuffer, 0x00U, BUFFER_LENGTH);
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return true;
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}
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int CSerialController::read(unsigned char* buffer, unsigned int length)
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{
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assert(m_handle != INVALID_HANDLE_VALUE);
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assert(buffer != NULL);
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unsigned int ptr = 0U;
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while (ptr < length) {
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int ret = readNonblock(buffer + ptr, length - ptr);
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if (ret < 0) {
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return ret;
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} else if (ret == 0) {
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if (ptr == 0U)
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return 0;
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} else {
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ptr += ret;
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}
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}
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return int(length);
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}
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int CSerialController::readNonblock(unsigned char* buffer, unsigned int length)
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{
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assert(m_handle != INVALID_HANDLE_VALUE);
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assert(buffer != NULL);
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if (length > BUFFER_LENGTH)
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length = BUFFER_LENGTH;
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if (m_readPending && length != m_readLength) {
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::CancelIo(m_handle);
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m_readPending = false;
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}
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m_readLength = length;
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if (length == 0U)
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return 0;
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if (!m_readPending) {
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DWORD bytes = 0UL;
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BOOL res = ::ReadFile(m_handle, m_readBuffer, m_readLength, &bytes, &m_readOverlapped);
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if (res) {
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::memcpy(buffer, m_readBuffer, bytes);
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return int(bytes);
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}
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DWORD error = ::GetLastError();
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if (error != ERROR_IO_PENDING) {
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LogError("Error from ReadFile: %04lx", error);
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return -1;
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}
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m_readPending = true;
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}
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BOOL res = HasOverlappedIoCompleted(&m_readOverlapped);
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if (!res)
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return 0;
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DWORD bytes = 0UL;
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res = ::GetOverlappedResult(m_handle, &m_readOverlapped, &bytes, TRUE);
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if (!res) {
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LogError("Error from GetOverlappedResult (ReadFile): %04lx", ::GetLastError());
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return -1;
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}
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::memcpy(buffer, m_readBuffer, bytes);
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m_readPending = false;
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return int(bytes);
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}
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int CSerialController::write(const unsigned char* buffer, unsigned int length)
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{
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assert(m_handle != INVALID_HANDLE_VALUE);
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assert(buffer != NULL);
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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 bytes = 0UL;
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BOOL res = ::WriteFile(m_handle, buffer + ptr, length - ptr, &bytes, &m_writeOverlapped);
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if (!res) {
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DWORD error = ::GetLastError();
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if (error != ERROR_IO_PENDING) {
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LogError("Error from WriteFile: %04lx", error);
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return -1;
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}
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res = ::GetOverlappedResult(m_handle, &m_writeOverlapped, &bytes, TRUE);
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if (!res) {
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LogError("Error from GetOverlappedResult (WriteFile): %04lx", ::GetLastError());
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return -1;
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}
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}
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ptr += bytes;
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}
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return int(length);
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}
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void CSerialController::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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::CloseHandle(m_readOverlapped.hEvent);
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::CloseHandle(m_writeOverlapped.hEvent);
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}
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#else
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CSerialController::CSerialController(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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CSerialController::~CSerialController()
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{
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}
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bool CSerialController::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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LogError("Cannot open device - %s", 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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LogError("%s is not a TTY device", 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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LogError("Cannot get the attributes for %s", 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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LogError("Unsupported serial port speed - %d", 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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LogError("Cannot set the attributes for %s", 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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LogError("Cannot get the control attributes for %s", 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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LogError("Cannot set the control attributes for %s", 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 CSerialController::read(unsigned char* buffer, unsigned int length)
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{
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assert(buffer != NULL);
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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 = 0;
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tv.tv_usec = 0;
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n = ::select(m_fd + 1, &fds, NULL, NULL, &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, NULL, NULL, NULL);
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}
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if (n < 0) {
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LogError("Error from select(), errno=%d", 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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LogError("Error from read(), errno=%d", 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 CSerialController::write(const unsigned char* buffer, unsigned int length)
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{
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assert(buffer != NULL);
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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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LogError("Error returned from write(), errno=%d", 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 CSerialController::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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#endif
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