serial.cpp

#include <iostream>
#include <windows.h>

void sendSerialData(const wchar_t* portName, const char* data) {
    HANDLE hSerial;
    DCB dcbSerialParams = { 0 };
    COMMTIMEOUTS timeouts = { 0 };

    // Open the serial port
    hSerial = CreateFileW(portName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hSerial == INVALID_HANDLE_VALUE) {
        DWORD dwError = GetLastError();
        if (dwError == ERROR_FILE_NOT_FOUND) {
            std::cerr << "Serial port does not exist." << std::endl;
        }
        else {
            std::cerr << "Error opening serial port. Error code: " << dwError << std::endl;
        }
        return;
    }

    // Set device parameters
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error getting device state." << std::endl;
        CloseHandle(hSerial);
        return;
    }
    dcbSerialParams.BaudRate = CBR_9600;  // Example baud rate
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if (!SetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error setting device parameters." << std::endl;
        CloseHandle(hSerial);
        return;
    }

    // Set timeouts
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    if (!SetCommTimeouts(hSerial, &timeouts)) {
        std::cerr << "Error setting timeouts." << std::endl;
        CloseHandle(hSerial);
        return;
    }

    // Write data to serial port
    DWORD bytesWritten;
    if (!WriteFile(hSerial, data, strlen(data), &bytesWritten, NULL)) {
        std::cerr << "Error writing to serial port." << std::endl;
    }
    else {
        std::cout << "Data sent successfully." << std::endl;
    }

    // Close serial port
    CloseHandle(hSerial);
}

int main() {
    const wchar_t* portName = L"\\\\.\\COM3";  // COM port name for COM3
    const char* data = "0";  // Data to send

    sendSerialData(portName, data);

    return 0;
}