Merge pull request #719 from Riksu9000/improve_battery_reporting

Improve battery percentage calculation and reporting

src/components/battery/BatteryController.cpp

@@ -13,7 +13,7 @@ Battery::Battery() {
   nrf_gpio_cfg_input(PinMap::Charging, static_cast<nrf_gpio_pin_pull_t> GPIO_PIN_CNF_PULL_Disabled);
 }
 
-void Battery::Update() {
+void Battery::ReadPowerState() {
   isCharging = !nrf_gpio_pin_read(PinMap::Charging);
   isPowerPresent = !nrf_gpio_pin_read(PinMap::PowerPresent);
 
@@ -22,6 +22,10 @@ void Battery::Update() {
   } else if (!isPowerPresent) {
     isFull = false;
   }
+}
+
+void Battery::MeasureVoltage() {
+  ReadPowerState();
 
   if (isReading) {
     return;
@@ -69,18 +73,23 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
     // p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
     voltage = p_event->data.done.p_buffer[0] * (8 * 600) / 1024;
 
+    uint8_t newPercent;
     if (isFull) {
-      percentRemaining = 100;
+      newPercent = 100;
     } else if (voltage < battery_min) {
-      percentRemaining = 0;
+      newPercent = 0;
     } else {
-      percentRemaining = std::min((voltage - battery_min) * 100 / (battery_max - battery_min), isCharging ? 99 : 100);
+      newPercent = std::min((voltage - battery_min) * 100 / (battery_max - battery_min), isCharging ? 99 : 100);
+    }
+
+    if ((isPowerPresent && newPercent > percentRemaining) || (!isPowerPresent && newPercent < percentRemaining) || firstMeasurement) {
+      firstMeasurement = false;
+      percentRemaining = newPercent;
+      systemTask->PushMessage(System::Messages::BatteryPercentageUpdated);
     }
 
     nrfx_saadc_uninit();
     isReading = false;
-
-    systemTask->PushMessage(System::Messages::BatteryMeasurementDone);
   }
 }
 

src/components/battery/BatteryController.h

@@ -10,7 +10,8 @@ namespace Pinetime {
     public:
       Battery();
 
-      void Update();
+      void ReadPowerState();
+      void MeasureVoltage();
       void Register(System::SystemTask* systemTask);
 
       uint8_t PercentRemaining() const {
@@ -42,6 +43,7 @@ namespace Pinetime {
       bool isFull = false;
       bool isCharging = false;
       bool isPowerPresent = false;
+      bool firstMeasurement = true;
 
       void SaadcInit();
 

src/systemtask/Messages.h

@@ -24,7 +24,7 @@ namespace Pinetime {
         SetOffAlarm,
         StopRinging,
         MeasureBatteryTimerExpired,
-        BatteryMeasurementDone,
+        BatteryPercentageUpdated,
       };
     }
 }

src/systemtask/SystemTask.cpp

@@ -136,7 +136,6 @@ void SystemTask::Work() {
   touchPanel.Init();
   dateTimeController.Register(this);
   batteryController.Register(this);
-  batteryController.Update();
   motorController.Init();
   motionSensor.SoftReset();
   timerController.Register(this);
@@ -194,6 +193,8 @@ void SystemTask::Work() {
     nrf_gpio_cfg_sense_input(PinMap::PowerPresent, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_HIGH);
   }
 
+  batteryController.MeasureVoltage();
+
   idleTimer = xTimerCreate("idleTimer", pdMS_TO_TICKS(2000), pdFALSE, this, IdleTimerCallback);
   dimTimer = xTimerCreate("dimTimer", pdMS_TO_TICKS(settingsController.GetScreenTimeOut() - 2000), pdFALSE, this, DimTimerCallback);
   measureBatteryTimer = xTimerCreate("measureBattery", batteryMeasurementPeriod, pdTRUE, this, MeasureBatteryTimerCallback);
@@ -345,7 +346,7 @@ void SystemTask::Work() {
           stepCounterMustBeReset = true;
           break;
         case Messages::OnChargingEvent:
-          batteryController.Update();
+          batteryController.ReadPowerState();
           motorController.RunForDuration(15);
           ReloadIdleTimer();
           if (isSleeping && !isWakingUp) {
@@ -353,14 +354,10 @@ void SystemTask::Work() {
           }
           break;
         case Messages::MeasureBatteryTimerExpired:
-          sendBatteryNotification = true;
-          batteryController.Update();
+          batteryController.MeasureVoltage();
           break;
-        case Messages::BatteryMeasurementDone:
-          if (sendBatteryNotification) {
-            sendBatteryNotification = false;
-            nimbleController.NotifyBatteryLevel(batteryController.PercentRemaining());
-          }
+        case Messages::BatteryPercentageUpdated:
+          nimbleController.NotifyBatteryLevel(batteryController.PercentRemaining());
           break;
 
         default:

src/systemtask/SystemTask.h

@@ -133,14 +133,12 @@ namespace Pinetime {
       TimerHandle_t dimTimer;
       TimerHandle_t idleTimer;
       TimerHandle_t measureBatteryTimer;
-      bool sendBatteryNotification = false;
       bool doNotGoToSleep = false;
 
       void GoToRunning();
       void UpdateMotion();
       bool stepCounterMustBeReset = false;
       static constexpr TickType_t batteryMeasurementPeriod = pdMS_TO_TICKS(10 * 60 * 1000);
-      TickType_t lastBatteryNotificationTime = 0;
 
 #if configUSE_TRACE_FACILITY == 1
       SystemMonitor<FreeRtosMonitor> monitor;