519 lines
11 KiB
C++
519 lines
11 KiB
C++
/*
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* Copyright (C) 2002-2004,2007-2011,2013,2014-2017,2019,2020,2021 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 "UARTController.h"
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#include "Log.h"
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#include <cstring>
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#include <cassert>
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#if defined(_WIN32) || defined(_WIN64)
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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/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) || defined(_WIN64)
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CUARTController::CUARTController(const std::string& device, unsigned int 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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CUARTController::CUARTController(unsigned int speed, bool assertRTS) :
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m_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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}
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CUARTController::~CUARTController()
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{
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}
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bool CUARTController::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_ATTRIBUTE_NORMAL, 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.fDsrSensitivity = 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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return true;
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}
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int CUARTController::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 CUARTController::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 == 0U)
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return 0;
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DWORD errors;
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COMSTAT status;
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if (::ClearCommError(m_handle, &errors, &status) == 0) {
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LogError("Error from ClearCommError for %s, err=%04lx", m_device.c_str(), ::GetLastError());
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return -1;
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}
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if (status.cbInQue == 0UL)
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return 0;
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DWORD readLength = status.cbInQue;
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if (length < readLength)
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readLength = length;
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DWORD bytes = 0UL;
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BOOL ret = ::ReadFile(m_handle, buffer, readLength, &bytes, NULL);
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if (!ret) {
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LogError("Error from ReadFile for %s: %04lx", m_device.c_str(), ::GetLastError());
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return -1;
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}
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return int(bytes);
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}
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int CUARTController::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 ret = ::WriteFile(m_handle, buffer + ptr, length - ptr, &bytes, NULL);
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if (!ret) {
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LogError("Error from WriteFile for %s: %04lx", m_device.c_str(), ::GetLastError());
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return -1;
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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 CUARTController::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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#else
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CUARTController::CUARTController(const std::string& device, unsigned int 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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CUARTController::CUARTController(unsigned int speed, bool assertRTS) :
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m_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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}
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CUARTController::~CUARTController()
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{
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}
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bool CUARTController::open()
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{
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assert(m_fd == -1);
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#if defined(__APPLE__)
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m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK); /*open in block mode under OSX*/
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#else
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m_fd = ::open(m_device.c_str(), O_RDWR | O_NOCTTY | O_NDELAY, 0);
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#endif
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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))
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return setRaw();
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return true;
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}
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bool CUARTController::setRaw()
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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_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK);
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termios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL);
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termios.c_iflag &= ~(IXON | IXOFF | IXANY);
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termios.c_oflag &= ~(OPOST);
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termios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CRTSCTS);
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termios.c_cflag |= (CS8 | CLOCAL | CREAD);
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termios.c_lflag &= ~(ISIG | ICANON | IEXTEN);
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termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
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#if defined(__APPLE__)
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termios.c_cc[VMIN] = 1;
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termios.c_cc[VTIME] = 1;
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#define B460800 460800
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#else
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termios.c_cc[VMIN] = 0;
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termios.c_cc[VTIME] = 10;
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#endif
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#if !defined(B38400) || (B38400 != 38400)
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switch (m_speed) {
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#if defined(B1200)
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case 1200U:
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::cfsetospeed(&termios, B1200);
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::cfsetispeed(&termios, B1200);
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break;
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#endif /*B1200*/
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#if defined(B2400)
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case 2400U:
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::cfsetospeed(&termios, B2400);
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::cfsetispeed(&termios, B2400);
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break;
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#endif /*B2400*/
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#if defined(B4800)
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case 4800U:
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::cfsetospeed(&termios, B4800);
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::cfsetispeed(&termios, B4800);
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break;
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#endif /*B4800*/
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#if defined(B9600)
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case 9600U:
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::cfsetospeed(&termios, B9600);
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::cfsetispeed(&termios, B9600);
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break;
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#endif /*B9600*/
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#if defined(B19200)
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case 19200U:
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::cfsetospeed(&termios, B19200);
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::cfsetispeed(&termios, B19200);
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break;
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#endif /*B19200*/
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#if defined(B38400)
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case 38400U:
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::cfsetospeed(&termios, B38400);
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::cfsetispeed(&termios, B38400);
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break;
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#endif /*B38400*/
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#if defined(B57600)
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case 57600U:
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::cfsetospeed(&termios, B57600);
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::cfsetispeed(&termios, B57600);
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break;
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#endif /*B57600*/
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#if defined(B115200)
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case 115200U:
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::cfsetospeed(&termios, B115200);
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::cfsetispeed(&termios, B115200);
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break;
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#endif /*B115200*/
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#if defined(B230400)
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case 230400U:
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::cfsetospeed(&termios, B230400);
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::cfsetispeed(&termios, B230400);
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break;
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#endif /*B230400*/
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#if defined(B460800)
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case 460800U:
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::cfsetospeed(&termios, B460800);
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::cfsetispeed(&termios, B460800);
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break;
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#endif /*B460800*/
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default:
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LogError("Unsupported serial port speed - %u", m_speed);
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::close(m_fd);
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return false;
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}
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#else
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::cfsetospeed(&termios, m_speed);
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::cfsetispeed(&termios, m_speed);
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#endif
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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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#if defined(__APPLE__)
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setNonblock(false);
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#endif
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return true;
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}
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#if defined(__APPLE__)
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int CUARTController::setNonblock(bool nonblock)
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{
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int flag = ::fcntl(m_fd, F_GETFL, 0);
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if (nonblock)
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flag |= O_NONBLOCK;
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else
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flag &= ~O_NONBLOCK;
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return ::fcntl(m_fd, F_SETFL, flag);
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}
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#endif
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int CUARTController::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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bool CUARTController::canWrite(){
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#if defined(__APPLE__)
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fd_set wset;
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FD_ZERO(&wset);
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FD_SET(m_fd, &wset);
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struct timeval timeo;
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timeo.tv_sec = 0;
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timeo.tv_usec = 0;
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int rc = ::select(m_fd + 1, NULL, &wset, NULL, &timeo);
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if (rc > 0 && FD_ISSET(m_fd, &wset))
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return true;
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return false;
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#else
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return true;
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#endif
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}
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int CUARTController::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 = 0U;
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if (canWrite())
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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 CUARTController::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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