feat: always on display

src/components/settings/Settings.h

@@ -214,6 +214,17 @@ namespace Pinetime {
         return settings.screenTimeOut;
       };
 
+      void SetAlwaysOnDisplay(bool state) {
+        if (state != settings.alwaysOnDisplay) {
+          settingsChanged = true;
+        }
+        settings.alwaysOnDisplay = state;
+      };
+
+      bool GetAlwaysOnDisplay() const {
+        return settings.alwaysOnDisplay;
+      };
+
       void SetShakeThreshold(uint16_t thresh) {
         if (settings.shakeWakeThreshold != thresh) {
           settings.shakeWakeThreshold = thresh;
@@ -286,13 +297,15 @@ namespace Pinetime {
     private:
       Pinetime::Controllers::FS& fs;
 
-      static constexpr uint32_t settingsVersion = 0x0007;
+      static constexpr uint32_t settingsVersion = 0x0008;
 
       struct SettingsData {
         uint32_t version = settingsVersion;
         uint32_t stepsGoal = 10000;
         uint32_t screenTimeOut = 15000;
 
+        bool alwaysOnDisplay = false;
+
         ClockType clockType = ClockType::H24;
         WeatherFormat weatherFormat = WeatherFormat::Metric;
         Notification notificationStatus = Notification::On;

src/displayapp/DisplayApp.cpp

@@ -203,7 +203,11 @@ void DisplayApp::Refresh() {
   TickType_t queueTimeout;
   switch (state) {
     case States::Idle:
+      if (settingsController.GetAlwaysOnDisplay()) {
+        queueTimeout = lv_task_handler();
+      } else {
         queueTimeout = portMAX_DELAY;
+      }
       break;
     case States::Running:
       if (!currentScreen->IsRunning()) {

src/displayapp/screens/settings/SettingDisplay.cpp

@@ -15,7 +15,7 @@ namespace {
   }
 }
 
-constexpr std::array<uint16_t, 6> SettingDisplay::options;
+constexpr std::array<uint16_t, 7> SettingDisplay::options;
 
 SettingDisplay::SettingDisplay(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Settings& settingsController)
   : app {app}, settingsController {settingsController} {
@@ -46,7 +46,11 @@ SettingDisplay::SettingDisplay(Pinetime::Applications::DisplayApp* app, Pinetime
   char buffer[4];
   for (unsigned int i = 0; i < options.size(); i++) {
     cbOption[i] = lv_checkbox_create(container1, nullptr);
-    snprintf(buffer, sizeof(buffer), "%2" PRIu16 "s", options[i] / 1000);
+    if (options[i] == 0) {
+      sprintf(buffer, "%s", "Always On");
+    } else {
+      sprintf(buffer, "%2ds", options[i] / 1000);
+    }
     lv_checkbox_set_text(cbOption[i], buffer);
     cbOption[i]->user_data = this;
     lv_obj_set_event_cb(cbOption[i], event_handler);
@@ -64,6 +68,12 @@ SettingDisplay::~SettingDisplay() {
 }
 
 void SettingDisplay::UpdateSelected(lv_obj_t* object, lv_event_t event) {
+  if (settingsController.GetScreenTimeOut() == 0) {
+    settingsController.SetAlwaysOnDisplay(true);
+  } else {
+    settingsController.SetAlwaysOnDisplay(false);
+  }
+
   if (event == LV_EVENT_CLICKED) {
     for (unsigned int i = 0; i < options.size(); i++) {
       if (object == cbOption[i]) {

src/displayapp/screens/settings/SettingDisplay.h

@@ -21,7 +21,7 @@ namespace Pinetime {
 
       private:
         DisplayApp* app;
-        static constexpr std::array<uint16_t, 6> options = {5000, 7000, 10000, 15000, 20000, 30000};
+        static constexpr std::array<uint16_t, 7> options = {5000, 7000, 10000, 15000, 20000, 30000, 0};
 
         Controllers::Settings& settingsController;
         lv_obj_t* cbOption[options.size()];

src/systemtask/SystemTask.cpp

@@ -198,7 +198,10 @@ void SystemTask::Work() {
           doNotGoToSleep = true;
           break;
         case Messages::GoToRunning:
+          // SPI doesn't go to sleep for always on mode
+          if (!settingsController.GetAlwaysOnDisplay()) {
             spi.Wakeup();
+          }
 
           // Double Tap needs the touch screen to be in normal mode
           if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
@@ -231,7 +234,7 @@ void SystemTask::Work() {
           break;
         }
         case Messages::GoToSleep:
-          if (doNotGoToSleep) {
+          if (doNotGoToSleep or settingsController.GetAlwaysOnDisplay()) {
             break;
           }
           state = SystemTaskState::GoingToSleep; // Already set in PushMessage()
@@ -323,7 +326,11 @@ void SystemTask::Work() {
             // if it's in sleep mode. Avoid bricked device by disabling sleep mode on these versions.
             spiNorFlash.Sleep();
           }
+
+          // Must keep SPI awake when still updating the display for always on
+          if (!settingsController.GetAlwaysOnDisplay()) {
             spi.Sleep();
+          }
 
           // Double Tap needs the touch screen to be in normal mode
           if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
@@ -503,7 +510,7 @@ void SystemTask::OnTouchEvent() {
 }
 
 void SystemTask::PushMessage(System::Messages msg) {
-  if (msg == Messages::GoToSleep && !doNotGoToSleep) {
+  if (msg == Messages::GoToSleep && !doNotGoToSleep && !settingsController.GetAlwaysOnDisplay()) {
     state = SystemTaskState::GoingToSleep;
   }