main.cpp

/* * Project: Sim-Universal-Interface-STM32
 * Author: customsmtr (CustomSimEchoSystem)
 * License: MIT
 */

#include <Arduino.h> 
#include <USBComposite.h>

// Initialize the composite device with HID and Serial
USBHID HID;
HIDJoystick Joystick(HID);
HIDKeyboard Keyboard(HID);
USBCompositeSerial CompositeSerial;

const int BUTTON_PIN = PA0; 

void setup() {
    USBComposite.setVendorId(0x1209);
    USBComposite.setProductId(0x8989);
    USBComposite.setManufacturerString("CustomSimEchoSystem");
    USBComposite.setProductString("Universal Sim-Controller");

    pinMode(BUTTON_PIN, INPUT_PULLUP);

    // Initializing interfaces
    HID.begin();
    Keyboard.begin();
    Joystick.begin();
    CompositeSerial.begin();
    
    USBComposite.begin();
}

void loop() {
    // HID Joystick Logic
    if (digitalRead(BUTTON_PIN) == LOW) {
        Joystick.button(1, true); 
    } else {
        Joystick.button(1, false);
    }

    // CDC Serial & Keyboard Logic
    if (CompositeSerial.available()) {
        String msg = CompositeSerial.readStringUntil('\n');
        msg.trim();

        if (msg == "GET_ID") {
            CompositeSerial.println("ID:SIM_UNIVERSAL_V1");
        } 
        else if (msg == "PING") {
            CompositeSerial.println("PONG");
            Keyboard.press(KEY_TAB);
            delay(50);
            Keyboard.release(KEY_TAB);
        }
    }
    
    delay(10); 
}