Print battery voltage instead of battery icon for platform without battery

openrtx/src/ui/ui.c

@@ -695,6 +695,7 @@ void ui_saveState()
 
 void ui_updateFSM(event_t event, bool *sync_rtx)
 {
+#ifndef BAT_NONE
     // The volume knob has been set to OFF, shutdown the radio
     if(state.v_bat <= 0)
     {
@@ -702,7 +703,7 @@ void ui_updateFSM(event_t event, bool *sync_rtx)
         platform_terminate();
         return;
     }
-
+#endif
     // 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

openrtx/src/ui/ui_main.c

@@ -39,14 +39,19 @@ void _ui_drawMainTop()
               color_white, "%02d:%02d:%02d", last_state.time.hour,
               last_state.time.minute, last_state.time.second);
 #endif
-
-    // Print battery icon on top bar, use 4 px padding
+    // If the radio has no built-in battery, print input voltage
+#ifdef BAT_NONE
+    char volt_buf[6] = "";
+    snprintf(volt_buf, sizeof(volt_buf), "%.1fV", last_state.v_bat);
+    gfx_print(layout.top_pos, volt_buf, layout.top_font, TEXT_ALIGN_RIGHT, color_white);
+#else
+    // Otherwise print battery icon on top bar, use 4 px padding
     uint16_t bat_width = SCREEN_WIDTH / 9;
     uint16_t bat_height = layout.top_h - (layout.status_v_pad * 2);
     point_t bat_pos = {SCREEN_WIDTH - bat_width - layout.horizontal_pad,
                        layout.status_v_pad};
     gfx_drawBattery(bat_pos, bat_width, bat_height, last_state.charge);
-
+#endif
     // Print radio mode on top bar
     switch(last_state.channel.mode)
     {