onExit is now called with pointer to OSD_Entry at the time of exit

This will remove the final remaining reference to RC preview menu
(which required not to exit with KEY_ESC).

src/main/io/cms.c

@@ -78,10 +78,6 @@
 
 // Forwards
 static long cmsx_InfoInit(void);
-#if 0
-long cmsx_FeatureRead(void);
-long cmsx_FeatureWriteback(void);
-#endif
 
 // Device management
 
@@ -509,8 +505,8 @@ long cmsMenuChange(displayPort_t *pDisplay, void *ptr)
 
 static long cmsMenuBack(displayPort_t *pDisplay)
 {
-    if (currentMenu->onExit)
-        currentMenu->onExit();
+    if (currentMenu->onExit && currentMenu->onExit(pageTop + cursorRow) < 0)
+        return -1;
 
     if (menuStackIdx) {
         displayClear(pDisplay);
@@ -581,7 +577,7 @@ static long cmsMenuExit(displayPort_t *pDisplay, void *ptr)
         cmsTraverseGlobalExit(&menuMain);
 
         if (currentMenu->onExit)
-            currentMenu->onExit();
+            currentMenu->onExit((OSD_Entry *)NULL); // Forced exit
     }
 
     cmsInMenu = false;
@@ -812,7 +808,7 @@ static void cmsUpdate(displayPort_t *pDisplay, uint32_t currentTime)
             key = KEY_RIGHT;
             rcDelay = BUTTON_TIME;
         }
-        else if ((IS_HI(YAW) || IS_LO(YAW)) && currentMenu != &cmsx_menuRc) // this menu is used to check transmitter signals so can't exit using YAW
+        else if (IS_HI(YAW) || IS_LO(YAW))
         {
             key = KEY_ESC;
             rcDelay = BUTTON_TIME;
@@ -856,7 +852,7 @@ void cmsInit(void)
 }
 
 //
-// Menu contents
+// Built-in menu contents and support functions
 //
 
 // Info

src/main/io/cms_imu.c

@@ -63,8 +63,10 @@ long cmsx_PidRead(void)
     return 0;
 }
 
-long cmsx_PidWriteback(void)
+long cmsx_PidWriteback(OSD_Entry *self)
 {
+    UNUSED(self);
+
     uint8_t i;
 
     for (i = 0; i < 3; i++) {
@@ -132,13 +134,23 @@ long cmsx_RateExpoRead(void)
     return 0;
 }
 
-long cmsx_RateExpoWriteback(void)
+long cmsx_RateExpoWriteback(OSD_Entry *self)
 {
+    UNUSED(self);
+
     memcpy(&masterConfig.profile[masterConfig.current_profile_index].controlRateProfile[masterConfig.profile[masterConfig.current_profile_index].activeRateProfile], &rateProfile, sizeof(controlRateConfig_t));
 
     return 0;
 }
 
+long cmsx_menuRcConfirmBack(OSD_Entry *self)
+{
+    if (self && self->type == OME_Back)
+        return 0;
+    else
+        return -1;
+}
+
 OSD_Entry cmsx_menuRateExpoEntries[] =
 {
     {"--- RATE&EXPO ---", OME_Label, NULL, NULL, 0},
@@ -198,7 +210,7 @@ CMS_Menu cmsx_menuRc = {
     "MENURC",
     OME_MENU,
     NULL,
-    NULL,
+    cmsx_menuRcConfirmBack,
     NULL,
     cmsx_menuRcEntries,
 };

src/main/io/cms_imu.h

@@ -1,4 +1 @@
 extern CMS_Menu cmsx_menuImu;
-
-// This should be gone
-extern CMS_Menu cmsx_menuRc;

src/main/io/cms_types.h

@@ -57,6 +57,15 @@ typedef struct
 
 typedef long (*CMSMenuFuncPtr)(void);
 
+/*
+onExit function is called with self:
+(1) Pointer to an OSD_Entry when cmsMenuBack() was called.
+    Point to an OSD_Entry with type == OME_Back if BACK was selected.
+(2) 0 if called from menu exit (forced exit).
+*/
+
+typedef long (*CMSMenuOnExitPtr)(OSD_Entry *self);
+
 typedef struct
 {
     // These two are debug aids for menu content creators.
@@ -64,7 +73,7 @@ typedef struct
     OSD_MenuElement GUARD_type;
 
     CMSMenuFuncPtr onEnter;
-    CMSMenuFuncPtr onExit;
+    CMSMenuOnExitPtr onExit;
     CMSMenuFuncPtr onGlobalExit;
     OSD_Entry *entries;
 } CMS_Menu;