DmxShow/app.cpp

#include <iostream>
#include <windows.h>
#include <thread>
#include <chrono>
#include <csignal>


HANDLE hSerial = INVALID_HANDLE_VALUE;
// Number of channels in the universe
const int num_channels = 512;
bool blackoutMode = false;

void sendDMXData(HANDLE hSerial, unsigned char* data, int length);

void signalHandler(int signum) {
    std::cout << "Interrupt signal (" << signum << ") received.\n";
    blackoutMode = true;

    if (hSerial != INVALID_HANDLE_VALUE) {
        std::cout << "Closing serial port...\n";
        CloseHandle(hSerial);
    }

    exit(signum);
}

void sendDMXData(HANDLE hSerial, unsigned char* data, int length) {
    // Start with a DMX break condition
    EscapeCommFunction(hSerial, SETBREAK);
    std::this_thread::sleep_for(std::chrono::milliseconds(1));
    EscapeCommFunction(hSerial, CLRBREAK);
    std::this_thread::sleep_for(std::chrono::milliseconds(1)); 

   
    DWORD bytesWritten;
    unsigned char startCode = 0;
    WriteFile(hSerial, &startCode, 1, &bytesWritten, NULL);
    WriteFile(hSerial, data, length, &bytesWritten, NULL);
}

int main() {
    // Register the signal handler for SIGINT (Ctrl+C)
    std::signal(SIGINT, signalHandler);

    // Open the serial port
    hSerial = CreateFileA("\\\\.\\COM3", GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
    if (hSerial == INVALID_HANDLE_VALUE) {
        std::cerr << "Error opening COM3 port" << std::endl;
        return 1;
    }

    // Configure the serial port
    DCB dcbSerialParams = { 0 };
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error getting COM3 state" << std::endl;
        CloseHandle(hSerial);
        return 1;
    }

    dcbSerialParams.BaudRate = 250000; // DMX512 uses 250000 baud
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = TWOSTOPBITS; // DMX512 uses 2 stop bits
    dcbSerialParams.Parity = NOPARITY;

    if (!SetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error setting COM3 state" << std::endl;
        CloseHandle(hSerial);
        return 1;
    }

    // Set timeouts
    COMMTIMEOUTS timeouts = { 0 };
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;

    if (!SetCommTimeouts(hSerial, &timeouts)) {
        std::cerr << "Error setting COM3 timeouts" << std::endl;
        CloseHandle(hSerial);
        return 1;
    }

    // DMX data (512 channels, all set to 255)
    unsigned char buffer[num_channels];
    memset(buffer, 255, sizeof(buffer)); // Fill the buffer with 255
    
    // Send DMX data in an infinite loop
    while (!blackoutMode) {
        sendDMXData(hSerial, buffer, num_channels);
        std::this_thread::sleep_for(std::chrono::milliseconds(25));
        // Set random colors for channels 1, 2, and 3 of device 1
        std::srand(std::time(0)); // Seed random number generator

        buffer[0] = std::rand() % 256; // Random value for channel 1
        buffer[1] = std::rand() % 256; // Random value for channel 2
        buffer[2] = std::rand() % 256; // 
    }

    // Blackout buffer (512 channels, all set to 0)
    unsigned char blackoutBuffer[num_channels];
    memset(blackoutBuffer, 0, sizeof(blackoutBuffer)); // Fill the buffer with 0

    for (int x = 0; x < 10; x++) {
        printf("step: %d\n", x);
        sendDMXData(hSerial, blackoutBuffer, num_channels);
        std::this_thread::sleep_for(std::chrono::milliseconds(25)); 
    }

    printf("Done!\n");



    return 0;
}