Optimize FM and overlay shortcuts

App/app/action.c

@@ -502,7 +502,7 @@ void ACTION_FoxHunt(void)
     APP_RunFoxHunt();
     GUI_SelectNextDisplay(DISPLAY_MAIN);
 #else
-    if (APP_LaunchOverlayByName("FoxHunt") != APP_OK)
+    if (APP_LaunchOverlayShortcut(APP_SHORTCUT_FOXHUNT) != APP_OK)
         gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
 #endif
 }
@@ -515,7 +515,7 @@ void ACTION_Beacon(void)
     APP_RunBeacon();
     GUI_SelectNextDisplay(DISPLAY_MAIN);
 #else
-    if (APP_LaunchOverlayByName("Beacon") != APP_OK)
+    if (APP_LaunchOverlayShortcut(APP_SHORTCUT_BEACON) != APP_OK)
         gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
 #endif
 }
@@ -526,7 +526,7 @@ void ACTION_Beacon(void)
 void ACTION_FM(void)
 {
 #ifdef ENABLE_FEAT_F4HWN_OVERLAY_APPS
-    if (APP_LaunchOverlayByName("Broadcast FM") != APP_OK)
+    if (APP_LaunchOverlayShortcut(APP_SHORTCUT_FM) != APP_OK)
         gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
     return;
 #else

App/app/fm.c

@@ -52,8 +52,9 @@ const uint8_t BUTTON_EVENT_HELD = BUTTON_STATE_PRESSED | BUTTON_STATE_HELD;
 const uint8_t BUTTON_EVENT_SHORT =  0;
 const uint8_t BUTTON_EVENT_LONG =  BUTTON_STATE_HELD;
 
-
+#ifndef ENABLE_FEAT_F4HWN_OVERLAY_APPS
 static void Key_FUNC(KEY_Code_t Key, uint8_t state);
+#endif
 
 bool FM_CheckValidChannel(uint8_t Channel)
 {
@@ -94,6 +95,7 @@ int FM_ConfigureChannelState(void)
     return 0;
 }
 
+#ifndef ENABLE_FEAT_F4HWN_OVERLAY_APPS
 void FM_SetFrequency(void)
 {
     BK1080_SetFrequency(gEeprom.FM_FrequencyPlaying, gEeprom.FM_Band/*, gEeprom.FM_Space*/);
@@ -196,6 +198,7 @@ void FM_PlayAndUpdate(void)
     BACKLIGHT_TurnOn();
     FM_AudioPathOn();
 }
+#endif
 
 int FM_CheckFrequencyLock(uint16_t Frequency, uint16_t LowerLimit)
 {
@@ -240,6 +243,7 @@ int FM_CheckFrequencyLock(uint16_t Frequency, uint16_t LowerLimit)
     return 0;
 }
 
+#ifndef ENABLE_FEAT_F4HWN_OVERLAY_APPS
 static void Key_DIGITS(KEY_Code_t Key, uint8_t state)
 {
     enum { STATE_FREQ_MODE, STATE_MR_MODE, STATE_SAVE };
@@ -662,5 +666,31 @@ void FM_Start(void)
         SETTINGS_WriteCurrentState();
     #endif
 }
+#else
+/*
+ * Broadcast FM is sovereign in Overlay builds: its app owns tuning, scanning,
+ * audio and persistence through app_api.  Keep only the shared channel/state
+ * loader and FM_CheckFrequencyLock above; these tiny compatibility entry points
+ * satisfy generic firmware paths which cannot become active because Overlay
+ * builds never set gFmRadioMode or gFM_ScanState.
+ */
+void FM_TurnOff(void) {}
+void FM_EraseChannels(void) {}
+void FM_Tune(uint16_t Frequency, int8_t Step, bool bFlag)
+{
+    (void)Frequency;
+    (void)Step;
+    (void)bFlag;
+}
+void FM_PlayAndUpdate(void) {}
+void FM_ProcessKeys(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
+{
+    (void)Key;
+    (void)bKeyPressed;
+    (void)bKeyHeld;
+}
+void FM_Play(void) {}
+void FM_Start(void) {}
+#endif
 
 #endif

App/apps/app_overlay.c

@@ -671,11 +671,11 @@ static bool app_shortcuts_cached;
 static uint8_t app_shortcut_mask;
 static uint8_t app_shortcut_slots[3];
 
-static int8_t app_shortcut_index(const char *name)
+static int8_t app_shortcut_index(uint8_t shortcut)
 {
-    if (strncmp(name, "Broadcast FM", APP_NAME_LEN) == 0) return 0;
-    if (strncmp(name, "FoxHunt",      APP_NAME_LEN) == 0) return 1;
-    if (strncmp(name, "Beacon",       APP_NAME_LEN) == 0) return 2;
+    if (shortcut == APP_SHORTCUT_FM)      return 0;
+    if (shortcut == APP_SHORTCUT_FOXHUNT) return 1;
+    if (shortcut == APP_SHORTCUT_BEACON)  return 2;
     return -1;
 }
 
@@ -692,11 +692,12 @@ static void app_cache_shortcuts(void)
         if (APP_ValidateSlot(slot, &h) != APP_OK || h.link_vma != overlay_vma)
             continue;
 
-        const int8_t index = app_shortcut_index(h.name);
+        const uint8_t shortcut = (uint8_t)((h.flags & APP_FLAG_SHORTCUT_MASK) >>
+                                           APP_FLAG_SHORTCUT_SHIFT);
+        const int8_t index = app_shortcut_index(shortcut);
         if (index >= 0) {
-            const uint8_t bit = (uint8_t)(1u << index);
-            if (!(app_shortcut_mask & bit)) {
-                app_shortcut_mask |= bit;
+            if (!(app_shortcut_mask & shortcut)) {
+                app_shortcut_mask |= shortcut;
                 app_shortcut_slots[index] = slot;
             }
         }
@@ -711,25 +712,16 @@ uint8_t APP_OverlayShortcutMask(void)
     return app_shortcut_mask;
 }
 
-uint8_t APP_LaunchOverlayByName(const char *name)
+uint8_t APP_LaunchOverlayShortcut(uint8_t shortcut)
 {
-    const int8_t index = app_shortcut_index(name);
-    if (index >= 0) {
+    const int8_t index = app_shortcut_index(shortcut);
+    if (index < 0)
+        return APP_ERR_MAGIC;
+
     app_cache_shortcuts();
-        return (app_shortcut_mask & (1u << index))
+    return (app_shortcut_mask & shortcut)
          ? APP_LaunchOverlay(app_shortcut_slots[index])
          : APP_ERR_MAGIC;
-    }
-
-    app_header_t h;
-
-    for (uint8_t slot = 0; slot < APP_SLOT_COUNT; slot++) {
-        if (APP_ValidateSlot(slot, &h) == APP_OK &&
-            strncmp(h.name, name, APP_NAME_LEN) == 0)
-            return APP_LaunchOverlay(slot);
-    }
-
-    return APP_ERR_MAGIC;
 }
 
 uint8_t APP_SlotInfo(uint8_t slot, app_header_t *out_header)

App/apps/app_overlay.h

@@ -68,12 +68,14 @@
 #define APP_HDR_VERSION   1u
 #define APP_FLAG_COMMITTED   0x0001u
 #define APP_FLAG_SCREEN_SAVER 0x0002u
+#define APP_FLAG_SHORTCUT_SHIFT 8u
+#define APP_FLAG_SHORTCUT_MASK  0x0700u
 #define APP_NAME_LEN      16
 #define APP_VERSION_LEN   16
 
-#define APP_SHORTCUT_FM       (1u << 0)
-#define APP_SHORTCUT_FOXHUNT  (1u << 1)
-#define APP_SHORTCUT_BEACON   (1u << 2)
+#define APP_SHORTCUT_FM       0x01u
+#define APP_SHORTCUT_FOXHUNT  0x02u
+#define APP_SHORTCUT_BEACON   0x04u
 
 typedef struct __attribute__((packed)) {
     uint32_t magic;                    /* APP_MAGIC                              */
@@ -108,8 +110,8 @@ uint8_t APP_ValidateSlot(uint8_t slot, app_header_t *out_header);
  * Returns when the app exits; the internal flash is never touched. */
 uint8_t APP_LaunchOverlay(uint8_t slot);
 
-/* Find the first valid app with this exact header name and launch it. */
-uint8_t APP_LaunchOverlayByName(const char *name);
+/* Launch the first installed app advertising this shortcut bit. */
+uint8_t APP_LaunchOverlayShortcut(uint8_t shortcut);
 
 /* Cached availability of apps exposed as resident quick actions. */
 uint8_t APP_OverlayShortcutMask(void);

App/apps/beacon/build.sh

@@ -29,7 +29,8 @@ trap 'printf "\r  ❌ %-13s build failed            \n" "$APP_NAME"' ERR
 step 1 compile ; "$CC" $CFLAGS $LDFLAGS "${APP}_app.c" -lgcc -o "${APP}.elf"
 step 2 objcopy ; "$OBJCOPY" -O binary "${APP}.elf" "${APP}.bin"
 step 3 pack    ; python3 ../pack_app.py "${APP}.bin" "${OUT}.app" \
-                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" >/dev/null
+                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" \
+                   --shortcut beacon >/dev/null
 trap - ERR
 
 BYTES=$(wc -c < "${APP}.bin")

App/apps/fm/build.sh

@@ -29,7 +29,8 @@ trap 'printf "\r  ❌ %-13s build failed            \n" "$APP_NAME"' ERR
 step 1 compile ; "$CC" $CFLAGS $LDFLAGS "${APP}_app.c" -lgcc -o "${APP}.elf"
 step 2 objcopy ; "$OBJCOPY" -O binary "${APP}.elf" "${APP}.bin"
 step 3 pack    ; python3 ../pack_app.py "${APP}.bin" "${OUT}.app" \
-                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" --screensaver >/dev/null
+                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" \
+                   --shortcut fm --screensaver >/dev/null
 trap - ERR
 
 BYTES=$(wc -c < "${APP}.bin")

App/apps/foxhunt/build.sh

@@ -29,7 +29,8 @@ trap 'printf "\r  ❌ %-13s build failed            \n" "$APP_NAME"' ERR
 step 1 compile ; "$CC" $CFLAGS $LDFLAGS "${APP}_app.c" -lgcc -o "${APP}.elf"
 step 2 objcopy ; "$OBJCOPY" -O binary "${APP}.elf" "${APP}.bin"
 step 3 pack    ; python3 ../pack_app.py "${APP}.bin" "${OUT}.app" \
-                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" >/dev/null
+                   --name "$APP_NAME" --ver "$APP_VER" --vma "${APP_VMA}" \
+                   --shortcut foxhunt >/dev/null
 trap - ERR
 
 BYTES=$(wc -c < "${APP}.bin")

App/apps/pack_app.py

@@ -32,6 +32,13 @@ ABI_VERSION    = cdefine("app_api.h",     "APP_ABI_VERSION")
 OVERLAY_MAX    = cdefine("app_overlay.h", "APP_OVERLAY_MAX")   # 4 KiB overlay budget
 FLAG_COMMITTED = cdefine("app_overlay.h", "APP_FLAG_COMMITTED")
 FLAG_SCREEN_SAVER = cdefine("app_overlay.h", "APP_FLAG_SCREEN_SAVER")
+FLAG_SHORTCUT_SHIFT = cdefine("app_overlay.h", "APP_FLAG_SHORTCUT_SHIFT")
+SHORTCUTS = {
+    "none": 0,
+    "fm": cdefine("app_overlay.h", "APP_SHORTCUT_FM"),
+    "foxhunt": cdefine("app_overlay.h", "APP_SHORTCUT_FOXHUNT"),
+    "beacon": cdefine("app_overlay.h", "APP_SHORTCUT_BEACON"),
+}
 
 def field(s: str, n: int) -> bytes:
     b = s.encode("ascii", "strict")[: n - 1]
@@ -48,6 +55,8 @@ def main():
                     help="RAM VMA the app was linked at (must match the firmware overlay)")
     ap.add_argument("--screensaver", action="store_true",
                     help="allow the resident BLTime screen saver while this app is idle")
+    ap.add_argument("--shortcut", choices=SHORTCUTS, default="none",
+                    help="resident quick action advertised by this app")
     a = ap.parse_args()
 
     code = open(a.infile, "rb").read()
@@ -57,7 +66,9 @@ def main():
         sys.exit(f"code {len(code)} B exceeds overlay budget {OVERLAY_MAX} B")
 
     crc = zlib.crc32(code) & 0xFFFFFFFF
-    flags = FLAG_COMMITTED | (FLAG_SCREEN_SAVER if a.screensaver else 0)
+    flags = (FLAG_COMMITTED |
+             (FLAG_SCREEN_SAVER if a.screensaver else 0) |
+             (SHORTCUTS[a.shortcut] << FLAG_SHORTCUT_SHIFT))
     header = struct.pack(
         "<4sHHIIHH16s16sI8s",
         MAGIC, HDR_VERSION, ABI_VERSION,