Add state_terminate() that saves settings to flash

openrtx/include/state.h

@@ -121,6 +121,12 @@ extern state_t state;
  */
 void state_init();
 
+/**
+ * This function terminates the Radio state,
+ * Saving persistent settings to flash.
+ */
+void state_terminate();
+
 /**
  * This function applies the selected timezone after reading the time from
  * the RTC.

openrtx/src/state.c

@@ -90,6 +90,12 @@ void state_init()
     }
 }
 
+void state_terminate()
+{
+    // Write settings to flash memory
+    nvm_writeSettings(&state.settings);
+}
+
 void state_applyTimezone()
 {
     if(state.time.hour + state.settings.utc_timezone >= 24) 

openrtx/src/ui/ui.c

@@ -696,6 +696,13 @@ void ui_saveState()
 
 void ui_updateFSM(event_t event, bool *sync_rtx)
 {
+    // The volume knob has been set to OFF, shutdown the radio
+    if(state.v_bat <= 0)
+    {
+        state_terminate();
+        platform_terminate();
+        return;
+    }
     // Check if battery has enough charge to operate
     float charge = battery_getCharge(state.v_bat);
     if (!state.emergency && charge <= 0)