In order to stabilize the battery reading,

I modified the process to make 5 consecutive readings,
as the process is asynchronous,
there is no interference in the main process.

src/components/battery/BatteryController.cpp

@@ -23,12 +23,20 @@ void Battery::Update() {
   isCharging = !nrf_gpio_pin_read(chargingPin);
   isPowerPresent = !nrf_gpio_pin_read(powerPresentPin);
   
+  if ( isReading ) return;
   // Non blocking read
+  samples = 0;
+  isReading = true;
   SaadcInit();	
+
 	nrfx_saadc_sample();
   
 }
 
+void Battery::adcCallbackStatic(nrfx_saadc_evt_t const *event) {
+  instance->SaadcEventHandler(event);
+}
+
 void Battery::SaadcInit() {
   nrfx_saadc_config_t adcConfig = NRFX_SAADC_DEFAULT_CONFIG;
   APP_ERROR_CHECK(nrfx_saadc_init(&adcConfig, adcCallbackStatic));
@@ -68,10 +76,13 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const * p_event) {
 
       percentRemainingBuffer.insert(percentRemaining);
 
+      samples++;
+      if ( samples > percentRemainingSamples ) {
         nrfx_saadc_uninit();
+        isReading = false;
+      } else {
+        nrfx_saadc_sample();
+      }
     }
   }
 
-void Battery::adcCallbackStatic(nrfx_saadc_evt_t const *event) {
-    instance->SaadcEventHandler(event);
-}

src/components/battery/BatteryController.h

@@ -58,7 +58,7 @@ namespace Pinetime {
         static Battery *instance;
         nrf_saadc_value_t  saadc_value;
         
-        static constexpr uint8_t percentRemainingSamples = 10;
+        static constexpr uint8_t percentRemainingSamples = 5;
         CircBuffer<percentRemainingSamples> percentRemainingBuffer {};
 
         static constexpr uint32_t chargingPin = 12;
@@ -74,6 +74,9 @@ namespace Pinetime {
 
         void SaadcEventHandler(nrfx_saadc_evt_t const * p_event);
         static void adcCallbackStatic(nrfx_saadc_evt_t const *event);
+
+        bool isReading = false;
+        uint8_t samples = 0;
     };
   }
 }

src/displayapp/DisplayApp.cpp

@@ -132,7 +132,7 @@ void DisplayApp::Refresh() {
 //        clockScreen.SetBleConnectionState(bleController.IsConnected() ? Screens::Clock::BleConnectionStates::Connected : Screens::Clock::BleConnectionStates::NotConnected);
         break;
       case Messages::UpdateBatteryLevel:
-//        clockScreen.SetBatteryPercentRemaining(batteryController.PercentRemaining());
+        batteryController.Update();
         break;
       case Messages::NewNotification:
         LoadApp( Apps::NotificationsPreview, DisplayApp::FullRefreshDirections::Down );

src/displayapp/screens/BatteryInfo.cpp

@@ -84,7 +84,7 @@ void BatteryInfo::UpdateAnim() {
   batteryPercent = batteryController.PercentRemaining();
 
   if ( batteryPercent >= 0 ) {
-    if ( batteryController.IsCharging() ) {
+    if ( batteryController.IsCharging() and batteryPercent < 100 ) {
       animation +=1;
       if (animation >= 100) {
         animation = 0;
@@ -111,12 +111,17 @@ void BatteryInfo::UpdateScreen() {
   batteryVoltage = batteryController.Voltage();
 
   if ( batteryPercent >= 0 ) {
-    if ( batteryController.IsCharging() ) {
-      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, lv_color_hex(0xFF0000));
+    if ( batteryController.IsCharging() and batteryPercent < 100 ) {
+      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, LV_COLOR_RED);
       lv_label_set_text_static(status,"Battery charging");
-
+    } else if ( batteryPercent == 100 ) {
+      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, LV_COLOR_BLUE);
+      lv_label_set_text_static(status,"Battery is fully charged");
+    } else if ( batteryPercent < 10 ) {
+      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, LV_COLOR_YELLOW);
+      lv_label_set_text_static(status,"Battery is low");
     } else {
-      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, lv_color_hex(0x00FF00));
+      lv_obj_set_style_local_bg_color(charging_bar, LV_BAR_PART_INDIC , LV_STATE_DEFAULT, LV_COLOR_GREEN);
       lv_label_set_text_static(status,"Battery discharging");
     }
     

src/systemtask/SystemTask.cpp

@@ -98,7 +98,6 @@ void SystemTask::Work() {
                                                           heartRateController, settingsController, motionController);
   displayApp->Start();
 
-  batteryController.Update();
   displayApp->PushMessage(Pinetime::Applications::Display::Messages::UpdateBatteryLevel);
 
   heartRateSensor.Init();
@@ -106,7 +105,6 @@ void SystemTask::Work() {
   heartRateApp = std::make_unique<Pinetime::Applications::HeartRateTask>(heartRateSensor, heartRateController);
   heartRateApp->Start();
 
-
   nrf_gpio_cfg_sense_input(pinButton, (nrf_gpio_pin_pull_t)GPIO_PIN_CNF_PULL_Pulldown, (nrf_gpio_pin_sense_t)GPIO_PIN_CNF_SENSE_High);
   nrf_gpio_cfg_output(15);
   nrf_gpio_pin_set(15);
@@ -141,7 +139,14 @@ void SystemTask::Work() {
 
     uint8_t msg;
     if (xQueueReceive(systemTasksMsgQueue, &msg, 100)) {
+      
+      // call the battery controller or use the MSG in DisplayApp to get the battery status ???
+      // it is necessary to validate which is the most efficient
       batteryController.Update();
+      //displayApp->PushMessage(Pinetime::Applications::Display::Messages::UpdateBatteryLevel);
+      // analyze a more efficient way to do this refreshment
+      // this and the UpdateMotion(); can be called on a timer to be independent of the main process ???
+
       Messages message = static_cast<Messages >(msg);
       switch(message) {
         case Messages::EnableSleeping: