Dim screen before sleep (#464)

* Implement dimming

src/displayapp/DisplayApp.cpp

@@ -165,8 +165,15 @@ void DisplayApp::Refresh() {
   lastWakeTime = xTaskGetTickCount();
   if (messageReceived) {
     switch (msg) {
-      case Messages::GoToSleep:
+      case Messages::DimScreen:
+        // Backup brightness is the brightness to return to after dimming or sleeping
         brightnessController.Backup();
+        brightnessController.Set(Controllers::BrightnessController::Levels::Low);
+        break;
+      case Messages::RestoreBrightness:
+        brightnessController.Restore();
+        break;
+      case Messages::GoToSleep:
         while (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
           brightnessController.Lower();
           vTaskDelay(100);
@@ -230,6 +237,8 @@ void DisplayApp::Refresh() {
             }
           } else if (returnTouchEvent == gesture) {
             LoadApp(returnToApp, returnDirection);
+            brightnessController.Set(settingsController.GetBrightness());
+            brightnessController.Backup();
           } else if (touchMode == TouchModes::Gestures) {
             if (gesture == TouchEvents::Tap) {
               lvgl.SetNewTapEvent(info.x, info.y);
@@ -243,6 +252,8 @@ void DisplayApp::Refresh() {
         } else {
           if (!currentScreen->OnButtonPushed()) {
             LoadApp(returnToApp, returnDirection);
+            brightnessController.Set(settingsController.GetBrightness());
+            brightnessController.Backup();
           }
         }
         break;

src/displayapp/Messages.h

@@ -13,7 +13,9 @@ namespace Pinetime {
         NewNotification,
         TimerDone,
         BleFirmwareUpdateStarted,
-        UpdateTimeOut
+        UpdateTimeOut,
+        DimScreen,
+        RestoreBrightness
       };
     }
   }

src/systemtask/SystemTask.cpp

@@ -33,6 +33,13 @@ namespace {
   }
 }
 
+void DimTimerCallback(TimerHandle_t xTimer) {
+
+  NRF_LOG_INFO("DimTimerCallback");
+  auto sysTask = static_cast<SystemTask*>(pvTimerGetTimerID(xTimer));
+  sysTask->OnDim();
+}
+
 void IdleTimerCallback(TimerHandle_t xTimer) {
 
   NRF_LOG_INFO("IdleTimerCallback");
@@ -114,7 +121,6 @@ void SystemTask::Work() {
 
   nimbleController.Init();
   nimbleController.StartAdvertising();
-  brightnessController.Init();
   lcd.Init();
 
   twiMaster.Init();
@@ -179,8 +185,9 @@ void SystemTask::Work() {
     nrf_gpio_cfg_sense_input(pinPowerPresentIrq, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_HIGH);
   }
 
-  idleTimer = xTimerCreate("idleTimer", pdMS_TO_TICKS(settingsController.GetScreenTimeOut()), pdFALSE, this, IdleTimerCallback);
-  xTimerStart(idleTimer, 0);
+  idleTimer = xTimerCreate("idleTimer", pdMS_TO_TICKS(2000), pdFALSE, this, IdleTimerCallback);
+  dimTimer = xTimerCreate("dimTimer", pdMS_TO_TICKS(settingsController.GetScreenTimeOut() - 2000), pdFALSE, this, DimTimerCallback);
+  xTimerStart(dimTimer, 0);
 
 // Suppress endless loop diagnostic
 #pragma clang diagnostic push
@@ -208,7 +215,7 @@ void SystemTask::Work() {
           doNotGoToSleep = true;
           break;
         case Messages::UpdateTimeOut:
-          xTimerChangePeriod(idleTimer, pdMS_TO_TICKS(settingsController.GetScreenTimeOut()), 0);
+          xTimerChangePeriod(dimTimer, pdMS_TO_TICKS(settingsController.GetScreenTimeOut() - 2000), 0);
           break;
         case Messages::GoToRunning:
           spi.Wakeup();
@@ -220,7 +227,7 @@ void SystemTask::Work() {
           }
 
           nimbleController.StartAdvertising();
-          xTimerStart(idleTimer, 0);
+          xTimerStart(dimTimer, 0);
           spiNorFlash.Wakeup();
           lcd.Wakeup();
 
@@ -230,6 +237,7 @@ void SystemTask::Work() {
 
           isSleeping = false;
           isWakingUp = false;
+          isDimmed = false;
           break;
         case Messages::TouchWakeUp: {
           twiMaster.Wakeup();
@@ -246,6 +254,7 @@ void SystemTask::Work() {
           isGoingToSleep = true;
           NRF_LOG_INFO("[systemtask] Going to sleep");
           xTimerStop(idleTimer, 0);
+          xTimerStop(dimTimer, 0);
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::GoToSleep);
           heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::GoToSleep);
           break;
@@ -283,13 +292,15 @@ void SystemTask::Work() {
             NVIC_SystemReset();
           }
           doNotGoToSleep = false;
-          xTimerStart(idleTimer, 0);
+          xTimerStart(dimTimer, 0);
           break;
         case Messages::OnTouchEvent:
           ReloadIdleTimer();
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::TouchEvent);
           break;
         case Messages::OnButtonEvent:
           ReloadIdleTimer();
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::ButtonPushed);
           break;
         case Messages::OnDisplayTaskSleeping:
           if (BootloaderVersion::IsValid()) {
@@ -381,7 +392,6 @@ void SystemTask::OnButtonPushed() {
   if (!isSleeping) {
     NRF_LOG_INFO("[systemtask] Button pushed");
     PushMessage(Messages::OnButtonEvent);
-    displayApp.PushMessage(Pinetime::Applications::Display::Messages::ButtonPushed);
   } else {
     if (!isWakingUp) {
       NRF_LOG_INFO("[systemtask] Button pushed, waking up");
@@ -402,7 +412,6 @@ void SystemTask::OnTouchEvent() {
     return;
   if (!isSleeping) {
     PushMessage(Messages::OnTouchEvent);
-    displayApp.PushMessage(Pinetime::Applications::Display::Messages::TouchEvent);
   } else if (!isWakingUp) {
     if (settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::SingleTap) or
         settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
@@ -430,6 +439,15 @@ void SystemTask::PushMessage(System::Messages msg) {
   }
 }
 
+void SystemTask::OnDim() {
+  if (doNotGoToSleep)
+    return;
+  NRF_LOG_INFO("Dim timeout -> Dim screen")
+  displayApp.PushMessage(Pinetime::Applications::Display::Messages::DimScreen);
+  xTimerStart(idleTimer, 0);
+  isDimmed = true;
+}
+
 void SystemTask::OnIdle() {
   if (doNotGoToSleep)
     return;
@@ -437,8 +455,13 @@ void SystemTask::OnIdle() {
   PushMessage(Messages::GoToSleep);
 }
 
-void SystemTask::ReloadIdleTimer() const {
+void SystemTask::ReloadIdleTimer() {
   if (isSleeping || isGoingToSleep)
     return;
-  xTimerReset(idleTimer, 0);
+  if (isDimmed) {
+    displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+    isDimmed = false;
+  }
+  xTimerReset(dimTimer, 0);
+  xTimerStop(idleTimer, 0);
 }

src/systemtask/SystemTask.h

@@ -71,6 +71,7 @@ namespace Pinetime {
       void OnTouchEvent();
 
       void OnIdle();
+      void OnDim();
 
       Pinetime::Controllers::NimbleController& nimble() {
         return nimbleController;
@@ -99,6 +100,7 @@ namespace Pinetime {
       std::atomic<bool> isSleeping {false};
       std::atomic<bool> isGoingToSleep {false};
       std::atomic<bool> isWakingUp {false};
+      std::atomic<bool> isDimmed {false};
       Pinetime::Drivers::Watchdog& watchdog;
       Pinetime::Controllers::NotificationManager& notificationManager;
       Pinetime::Controllers::MotorController& motorController;
@@ -106,8 +108,6 @@ namespace Pinetime {
       Pinetime::Drivers::Bma421& motionSensor;
       Pinetime::Controllers::Settings& settingsController;
       Pinetime::Controllers::HeartRateController& heartRateController;
-            
-      Controllers::BrightnessController brightnessController;
       Pinetime::Controllers::MotionController& motionController;
 
       Pinetime::Applications::DisplayApp& displayApp;
@@ -126,9 +126,10 @@ namespace Pinetime {
 
       static void Process(void* instance);
       void Work();
-      void ReloadIdleTimer() const;
+      void ReloadIdleTimer();
       bool isBleDiscoveryTimerRunning = false;
       uint8_t bleDiscoveryTimer = 0;
+      TimerHandle_t dimTimer;
       TimerHandle_t idleTimer;
       bool doNotGoToSleep = false;