Show empty battery symbol in order to entice user to connect power.

Author: aentinger

src/Braccio.cpp

@@ -127,6 +127,15 @@ bool BraccioClass::begin(voidFuncPtr customMenu) {
 
   splashScreen();
 
+  {
+    lv_style_set_text_font(&_lv_style, &lv_font_montserrat_48);
+    lv_obj_t * label1 = lv_label_create(lv_scr_act());
+    lv_obj_add_style(label1, &_lv_style, 0);
+    lv_label_set_text(label1, LV_SYMBOL_BATTERY_EMPTY);
+    lv_obj_set_align(label1, LV_ALIGN_CENTER);
+    lv_obj_set_pos(label1, 0, 0);
+  }
+
   for(auto const now = millis();
       ((millis() - now) < 5000) && !PD_UFP.is_PPS_ready();)
   {
@@ -137,6 +146,8 @@ bool BraccioClass::begin(voidFuncPtr customMenu) {
     i2c_mutex.unlock();
   }
 
+  lv_obj_clean(lv_scr_act());
+
   if (!PD_UFP.is_PPS_ready())
   {
     lv_style_set_text_font(&_lv_style, &lv_font_montserrat_32);

src/lv_conf.h

@@ -282,7 +282,7 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h"*/
 #define LV_FONT_MONTSERRAT_42    0
 #define LV_FONT_MONTSERRAT_44    0
 #define LV_FONT_MONTSERRAT_46    0
-#define LV_FONT_MONTSERRAT_48    0
+#define LV_FONT_MONTSERRAT_48    1
 
 /*Demonstrate special features*/
 #define LV_FONT_MONTSERRAT_12_SUBPX      0