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Library/PackageCache/com.unity.inputsystem@2436e68c60c4/Documentation~/step-3-update-method.md

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+---
+uid: input-system-step-3-update-method
+---
+
+# Step 3 The Update method
+
+You now have a Device in place along with its associated state format. You can call the following method to create a fully set-up Device with your two Controls on it:
+
+```CSharp
+InputSystem.AddDevice<MyDevice>();
+```
+
+However, this Device doesn't receive input yet, because you haven't added any code that generates input. To do that, you can use [`InputSystem.QueueStateEvent`](xref:UnityEngine.InputSystem.InputSystem) or [`InputSystem.QueueDeltaStateEvent`](xref:UnityEngine.InputSystem.InputSystem) from anywhere, including from a thread. The following example uses [`IInputUpdateCallbackReceiver`](xref:UnityEngine.InputSystem.LowLevel.IInputUpdateCallbackReceiver), which, when implemented by any [`InputDevice`](xref:UnityEngine.InputSystem.InputDevice), adds an [`OnUpdate()`](xref:UnityEngine.InputSystem.LowLevel.IInputUpdateCallbackReceiver) method that automatically gets called during [`InputSystem.onBeforeUpdate`](xref:UnityEngine.InputSystem.InputSystem) and provides input events to the current input update.
+
+> [!NOTE]
+> If you already have a place where input for your device becomes available, you can skip this step and queue input events from there instead of using [`IInputUpdateCallbackReceiver`](xref:UnityEngine.InputSystem.LowLevel.IInputUpdateCallbackReceiver).
+
+```CSharp
+public class MyDevice : InputDevice, IInputUpdateCallbackReceiver
+{
+    //...
+
+    public void OnUpdate()
+    {
+        // In practice, this would read out data from an external
+        // API. This example uses some empty input.
+        var state = new MyDeviceState();
+        InputSystem.QueueStateEvent(this, state);
+    }
+}
+```