Made UI fsm skip low battery check when TX is enabled to avoid spurious triggers of low battery alert caused by the high current absorption from RF PA

openrtx/src/threads.c

@@ -251,11 +251,6 @@ static void dev_task(void *arg)
     (void) arg;
     OS_ERR os_err;
 
-    // Initialise battery voltage, to avoid filter settling transient
-    OSMutexPend(&state_mutex, 0u, OS_OPT_PEND_BLOCKING, 0u, &os_err);
-    state.v_bat = platform_getVbat();
-    OSMutexPost(&state_mutex, OS_OPT_POST_NONE, &os_err);
-
     while(1)
     {
         // Lock mutex and update internal state

openrtx/src/ui/ui.c

@@ -703,12 +703,17 @@ void ui_updateFSM(event_t event, bool *sync_rtx)
         platform_terminate();
         return;
     }
-    // Check if battery has enough charge to operate
-    float charge = battery_getCharge(state.v_bat);
-    if (!state.emergency && charge <= 0)
+
+    // Check if battery has enough charge to operate.
+    // Check is skipped if there is an ongoing transmission, since the voltage
+    // drop caused by the RF PA power absorption causes spurious triggers of
+    // the low battery alert.
+    bool txOngoing = platform_getPttStatus();
+    if ((!state.emergency) && (!txOngoing) && (state.charge <= 0))
     {
         state.ui_screen = LOW_BAT;
-        if(event.type == EVENT_KBD && event.payload) {
+        if(event.type == EVENT_KBD && event.payload)
+        {
             state.ui_screen = MAIN_VFO;
             state.emergency = true;
         }
@@ -726,7 +731,9 @@ void ui_updateFSM(event_t event, bool *sync_rtx)
             macro_menu = true;
             _ui_fsm_menuMacro(msg, sync_rtx);
             return;
-        } else {
+        }
+        else
+        {
             macro_menu = false;
         }
         switch(state.ui_screen)