feat(a380x/fcu): automatically select LS on LOC or APPR arming (#9670)

* feat(fcu): auto select LS on FCU appr mode active

* docs: add changelog

* fix: also use loc arming

.github/CHANGELOG.md

@@ -100,6 +100,7 @@
 1. [ELEC] Improved elec system startup behaviour - @Gurgel100 (Pascal) - @saschl
 1. [A380X] Improve pilot and copilot camera positions - @heclak (Heclak)
 1. [A380X/EFIS] Illuminate ND range and mode selectors during light test - @BravoMike99 (bruno_pt99)
+1. [A380X/FCU] Automatically select LS on LOC mode arming - @BravoMike99 (bruno_pt99)
 1. [A380/PFD] Add DISCONNECT AP FOR LDG FMA message - @BravoMike99 (bruno_pt99)
 1. [A380X/ENG] Adjust climb thrust to be more accurate - @BlueberryKing (BlueberryKing)
 1. [A380X/EWD] Show THR limit in EWD instead of N1 - @flogross89 (floridude)

fbw-a380x/src/systems/instruments/src/FCU/FcuFsInstrument.tsx

@@ -21,6 +21,7 @@ import { BaroManager } from './Managers/BaroManager';
 import { HeadingManager } from './Managers/HeadingManager';
 import { SpeedManager } from './Managers/SpeedManager';
 import { VerticalSpeedManager } from './Managers/VerticalSpeedManager';
+import { LsManager } from './Managers/LsManager';
 import { FcuPublisher } from './Publishers/FcuPublisher';
 import { FGDataPublisher } from '../MsfsAvionicsCommon/providers/FGDataPublisher';
 import { OverheadPublisher } from '../MsfsAvionicsCommon/providers/OverheadPublisher';
@@ -66,6 +67,7 @@ export class FcuFsInstrument implements FsInstrument {
     this.backplane.addInstrument('HeadingManager', new HeadingManager(this.bus));
     this.backplane.addInstrument('SpeedManager', new SpeedManager(this.bus));
     this.backplane.addInstrument('VerticalSpeedManager', new VerticalSpeedManager(this.bus));
+    this.backplane.addInstrument('Lsmanager', new LsManager(this.bus));
 
     this.backplane.addPublisher('FcuPublisher', new FcuPublisher(this.bus));
     this.backplane.addPublisher('FgBusPublisher', new FGDataPublisher(this.bus));

fbw-a380x/src/systems/instruments/src/FCU/Managers/LsManager.ts

@@ -0,0 +1,30 @@
+// Copyright (c) 2024 FlyByWire Simulations
+// SPDX-License-Identifier: GPL-3.0
+import { ConsumerSubject, EventBus, Instrument, MappedSubject, SubscribableMapFunctions } from '@microsoft/msfs-sdk';
+import { FcuEvents } from '../Publishers/FcuPublisher';
+
+export class LsManager implements Instrument {
+  private readonly sub = this.bus.getSubscriber<FcuEvents>();
+
+  private readonly locActive = ConsumerSubject.create(this.sub.on('fcu_loc_mode_active'), false);
+
+  private readonly apprActive = ConsumerSubject.create(this.sub.on('fcu_approach_mode_active'), false);
+
+  private readonly locOrApprSelected = MappedSubject.create(
+    SubscribableMapFunctions.or(),
+    this.locActive,
+    this.apprActive,
+  );
+
+  constructor(private readonly bus: EventBus) {}
+
+  init(): void {
+    this.locOrApprSelected.sub((v) => {
+      if (v) {
+        SimVar.SetSimVarValue('L:A380X_EFIS_L_LS_BUTTON_IS_ON', 'Bool', true);
+        SimVar.SetSimVarValue('L:A380X_EFIS_R_LS_BUTTON_IS_ON', 'Bool', true);
+      }
+    });
+  }
+  onUpdate(): void {}
+}

fbw-a380x/src/systems/instruments/src/FCU/Publishers/FcuPublisher.ts

@@ -9,6 +9,8 @@ interface FcuBaseEvents {
   fcu_trk_fpa_active: boolean;
   fcu_left_navaid_mode: NavAidMode;
   fcu_right_navaid_mode: NavAidMode;
+  fcu_loc_mode_active: boolean;
+  fcu_approach_mode_active: boolean;
 }
 
 type IndexedTopics = 'fcu_left_navaid_mode' | 'fcu_right_navaid_mode';
@@ -36,6 +38,20 @@ export class FcuPublisher extends SimVarPublisher<FcuEvents> {
         'fcu_right_navaid_mode',
         { name: `L:A32NX_EFIS_R_NAVAID_#index#_MODE`, type: SimVarValueType.Enum, indexed: true },
       ],
+      [
+        'fcu_loc_mode_active',
+        {
+          name: 'L:A32NX_FCU_LOC_MODE_ACTIVE',
+          type: SimVarValueType.Bool,
+        },
+      ],
+      [
+        'fcu_approach_mode_active',
+        {
+          name: 'L:A32NX_FCU_APPR_MODE_ACTIVE',
+          type: SimVarValueType.Bool,
+        },
+      ],
     ]);
 
     super(simvars, bus, pacer);