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/*
* Author: Manash Kumar Mandal
* Modified Library introduced in Arduino Playground which does not work
* This works perfectly
* LICENSE: MIT
*/
#include "SerialPort.hpp"
SerialPort::SerialPort(const char *portName, int BAUD)
{
this->connected = false;
this->handler = CreateFileA(static_cast<LPCSTR>(portName),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (this->handler == INVALID_HANDLE_VALUE)
{
if (GetLastError() == ERROR_FILE_NOT_FOUND)
{
std::cerr << "ERROR: Handle was not attached.Reason : " << portName << " not available\n";
}
else
{
std::cerr << "ERROR!!!\n";
}
}
else
{
DCB dcbSerialParameters = {0};
if (!GetCommState(this->handler, &dcbSerialParameters))
{
std::cerr << "Failed to get current serial parameters\n";
}
else
{
dcbSerialParameters.BaudRate = BAUD;
dcbSerialParameters.ByteSize = 8;
dcbSerialParameters.StopBits = ONESTOPBIT;
dcbSerialParameters.Parity = NOPARITY;
dcbSerialParameters.fDtrControl = DTR_CONTROL_ENABLE;
if (!SetCommState(handler, &dcbSerialParameters))
{
std::cout << "ALERT: could not set serial port parameters\n";
}
else
{
this->connected = true;
PurgeComm(this->handler, PURGE_RXCLEAR | PURGE_TXCLEAR);
Sleep(ARDUINO_WAIT_TIME);
}
}
}
}
SerialPort::~SerialPort()
{
if (this->connected)
{
this->connected = false;
CloseHandle(this->handler);
}
}
// Reading bytes from serial port to buffer;
// returns read bytes count, or if error occurs, returns 0
int SerialPort::readSerialPort(const char *buffer, unsigned int buf_size)
{
DWORD bytesRead{};
unsigned int toRead = 0;
ClearCommError(this->handler, &this->errors, &this->status);
if (this->status.cbInQue > 0)
{
if (this->status.cbInQue > buf_size)
{
toRead = buf_size;
}
else
{
toRead = this->status.cbInQue;
}
}
memset((void*) buffer, 0, buf_size);
if (ReadFile(this->handler, (void*) buffer, toRead, &bytesRead, NULL))
{
return bytesRead;
}
return 0;
}
// Sending provided buffer to serial port;
// returns true if succeed, false if not
bool SerialPort::writeSerialPort(const char *buffer, unsigned int buf_size)
{
DWORD bytesSend;
if (!WriteFile(this->handler, (void*) buffer, buf_size, &bytesSend, 0))
{
ClearCommError(this->handler, &this->errors, &this->status);
return false;
}
return true;
}
// Checking if serial port is connected
bool SerialPort::isConnected()
{
if (!ClearCommError(this->handler, &this->errors, &this->status))
{
this->connected = false;
}
return this->connected;
}
void SerialPort::closeSerial()
{
CloseHandle(this->handler);
}
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