Merge 6f146fc0cd into 3a0d673df4

This is needed since a new memory chip will be used in future batches of PineTimes.

src/components/brightness/BrightnessController.cpp

@@ -2,38 +2,138 @@
 #include <hal/nrf_gpio.h>
 #include "displayapp/screens/Symbols.h"
 #include "drivers/PinMap.h"
+#include <libraries/delay/nrf_delay.h>
 using namespace Pinetime::Controllers;
 
+namespace {
+  // reinterpret_cast is not constexpr so this is the best we can do
+  static NRF_RTC_Type* const RTC = reinterpret_cast<NRF_RTC_Type*>(NRF_RTC2_BASE);
+}
+
 void BrightnessController::Init() {
   nrf_gpio_cfg_output(PinMap::LcdBacklightLow);
   nrf_gpio_cfg_output(PinMap::LcdBacklightMedium);
   nrf_gpio_cfg_output(PinMap::LcdBacklightHigh);
+
+  nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+  nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
+  nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
+
+  static_assert(timerFrequency == 32768, "Change the prescaler below");
+  RTC->PRESCALER = 0;
+  // CC1 switches the backlight on (pin transitions from high to low) and resets the counter to 0
+  RTC->CC[1] = timerPeriod;
+  // Enable compare events for CC0,CC1
+  RTC->EVTEN = 0b0000'0000'0000'0011'0000'0000'0000'0000;
+  // Disable all interrupts
+  RTC->INTENCLR = 0b0000'0000'0000'1111'0000'0000'0000'0011;
   Set(level);
 }
 
+void BrightnessController::ApplyBrightness(uint16_t rawBrightness) {
+  // The classic off, low, medium, high brightnesses are at {0, timerPeriod, timerPeriod*2, timerPeriod*3}
+  // These brightness levels do not use PWM: they only set/clear the corresponding pins
+  // Any brightness level between the above levels is achieved with efficient RTC based PWM on the next pin up
+  // E.g 2.5*timerPeriod corresponds to medium brightness with 50% PWM on the high pin
+  // Note: Raw brightness does not necessarily correspond to a linear perceived brightness
+
+  uint8_t pin;
+  if (rawBrightness > 2 * timerPeriod) {
+    rawBrightness -= 2 * timerPeriod;
+    pin = PinMap::LcdBacklightHigh;
+  } else if (rawBrightness > timerPeriod) {
+    rawBrightness -= timerPeriod;
+    pin = PinMap::LcdBacklightMedium;
+  } else {
+    pin = PinMap::LcdBacklightLow;
+  }
+  if (rawBrightness == timerPeriod || rawBrightness == 0) {
+    if (lastPin != UNSET) {
+      RTC->TASKS_STOP = 1;
+      nrf_delay_us(rtcStopTime);
+      nrf_ppi_channel_disable(ppiBacklightOff);
+      nrf_ppi_channel_disable(ppiBacklightOn);
+      nrfx_gpiote_out_uninit(lastPin);
+      nrf_gpio_cfg_output(lastPin);
+    }
+    lastPin = UNSET;
+    if (rawBrightness == 0) {
+      nrf_gpio_pin_set(pin);
+    } else {
+      nrf_gpio_pin_clear(pin);
+    }
+  } else {
+    // If the pin on which we are doing PWM is changing
+    // Disable old PWM channel (if exists) and set up new one
+    if (lastPin != pin) {
+      if (lastPin != UNSET) {
+        RTC->TASKS_STOP = 1;
+        nrf_delay_us(rtcStopTime);
+        nrf_ppi_channel_disable(ppiBacklightOff);
+        nrf_ppi_channel_disable(ppiBacklightOn);
+        nrfx_gpiote_out_uninit(lastPin);
+        nrf_gpio_cfg_output(lastPin);
+      }
+      nrfx_gpiote_out_config_t gpioteCfg = {.action = NRF_GPIOTE_POLARITY_TOGGLE,
+                                            .init_state = NRF_GPIOTE_INITIAL_VALUE_LOW,
+                                            .task_pin = true};
+      APP_ERROR_CHECK(nrfx_gpiote_out_init(pin, &gpioteCfg));
+      nrfx_gpiote_out_task_enable(pin);
+      nrf_ppi_channel_endpoint_setup(ppiBacklightOff,
+                                     reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[0]),
+                                     nrfx_gpiote_out_task_addr_get(pin));
+      nrf_ppi_channel_endpoint_setup(ppiBacklightOn,
+                                     reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[1]),
+                                     nrfx_gpiote_out_task_addr_get(pin));
+      nrf_ppi_fork_endpoint_setup(ppiBacklightOn, reinterpret_cast<uint32_t>(&RTC->TASKS_CLEAR));
+      nrf_ppi_channel_enable(ppiBacklightOff);
+      nrf_ppi_channel_enable(ppiBacklightOn);
+    } else {
+      // If the pin used for PWM isn't changing, we only need to set the pin state to the initial value (low)
+      RTC->TASKS_STOP = 1;
+      nrf_delay_us(rtcStopTime);
+      // Due to errata 20,179 and the intricacies of RTC timing, keep it simple: override the pin state
+      nrfx_gpiote_out_task_force(pin, false);
+    }
+    // CC0 switches the backlight off (pin transitions from low to high)
+    RTC->CC[0] = rawBrightness;
+    RTC->TASKS_CLEAR = 1;
+    RTC->TASKS_START = 1;
+    lastPin = pin;
+  }
+  switch (pin) {
+    case PinMap::LcdBacklightHigh:
+      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
+      break;
+    case PinMap::LcdBacklightMedium:
+      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      break;
+    case PinMap::LcdBacklightLow:
+      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
+      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+  }
+}
+
 void BrightnessController::Set(BrightnessController::Levels level) {
   this->level = level;
   switch (level) {
     default:
     case Levels::High:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
+      ApplyBrightness(3 * timerPeriod);
       break;
     case Levels::Medium:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(2 * timerPeriod);
       break;
     case Levels::Low:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(timerPeriod);
+      break;
+    case Levels::AlwaysOn:
+      ApplyBrightness(timerPeriod / 10);
       break;
     case Levels::Off:
-      nrf_gpio_pin_set(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(0);
       break;
   }
 }

src/components/brightness/BrightnessController.h

@@ -2,11 +2,14 @@
 
 #include <cstdint>
 
+#include "nrf_ppi.h"
+#include "nrfx_gpiote.h"
+
 namespace Pinetime {
   namespace Controllers {
     class BrightnessController {
     public:
-      enum class Levels { Off, Low, Medium, High };
+      enum class Levels { Off, AlwaysOn, Low, Medium, High };
       void Init();
 
       void Set(Levels level);
@@ -20,6 +23,25 @@ namespace Pinetime {
 
     private:
       Levels level = Levels::High;
+      static constexpr uint8_t UNSET = UINT8_MAX;
+      uint8_t lastPin = UNSET;
+      // Maximum time (μs) it takes for the RTC to fully stop
+      static constexpr uint8_t rtcStopTime = 46;
+      // Frequency of timer used for PWM (Hz)
+      static constexpr uint16_t timerFrequency = 32768;
+      // Backlight PWM frequency (Hz)
+      static constexpr uint16_t pwmFreq = 1000;
+      // Wraparound point in timer ticks
+      // Defines the number of brightness levels between each pin
+      static constexpr uint16_t timerPeriod = timerFrequency / pwmFreq;
+      // Warning: nimble reserves some PPIs
+      // https://github.com/InfiniTimeOrg/InfiniTime/blob/034d83fe6baf1ab3875a34f8cee387e24410a824/src/libs/mynewt-nimble/nimble/drivers/nrf52/src/ble_phy.c#L53
+      // SpiMaster uses PPI 0 for an erratum workaround
+      // Channel 1, 2 should be free to use
+      static constexpr nrf_ppi_channel_t ppiBacklightOn = NRF_PPI_CHANNEL1;
+      static constexpr nrf_ppi_channel_t ppiBacklightOff = NRF_PPI_CHANNEL2;
+
+      void ApplyBrightness(uint16_t val);
     };
   }
 }

src/components/settings/Settings.h

@@ -1,9 +1,12 @@
 #pragma once
 #include <cstdint>
 #include <bitset>
+#include <cstring>
+#include <array>
 #include "components/brightness/BrightnessController.h"
 #include "components/fs/FS.h"
 #include "displayapp/apps/Apps.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -60,15 +63,18 @@ namespace Pinetime {
       void Init();
       void SaveSettings();
 
-      void SetWatchFace(Pinetime::Applications::WatchFace face) {
-        if (face != settings.watchFace) {
+      void SetWatchFace(const char* face) {
+        const char* currentWatchFace = settings.watchFace.data();
+        if (std::strcmp(face, currentWatchFace) != 0) {
           settingsChanged = true;
+          auto len = std::min(std::strlen(face), Pinetime::Applications::MaxWatchFaceNameSize);
+          std::memcpy(settings.watchFace.data(), face, len);
+          settings.watchFace[len] = 0;
         }
-        settings.watchFace = face;
       };
 
-      Pinetime::Applications::WatchFace GetWatchFace() const {
-        return settings.watchFace;
+      const char* GetWatchFace() const {
+        return settings.watchFace.data();
       };
 
       void SetChimeOption(ChimesOption chimeOption) {
@@ -214,6 +220,21 @@ namespace Pinetime {
         return settings.screenTimeOut;
       };
 
+      bool GetAlwaysOnDisplay() const {
+        return settings.alwaysOnDisplay && GetNotificationStatus() != Notification::Sleep;
+      };
+
+      void SetAlwaysOnDisplaySetting(bool state) {
+        if (state != settings.alwaysOnDisplay) {
+          settingsChanged = true;
+        }
+        settings.alwaysOnDisplay = state;
+      }
+
+      bool GetAlwaysOnDisplaySetting() const {
+        return settings.alwaysOnDisplay;
+      }
+
       void SetShakeThreshold(uint16_t thresh) {
         if (settings.shakeWakeThreshold != thresh) {
           settings.shakeWakeThreshold = thresh;
@@ -286,18 +307,20 @@ 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;
 
-        Pinetime::Applications::WatchFace watchFace = Pinetime::Applications::WatchFace::Digital;
+        std::array<char, Pinetime::Applications::MaxWatchFaceNameSize + 1> watchFace = {0};
         ChimesOption chimesOption = ChimesOption::None;
 
         PineTimeStyle PTS;

src/displayapp/DisplayApp.cpp

@@ -81,7 +81,8 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
                        Pinetime::Controllers::AlarmController& alarmController,
                        Pinetime::Controllers::BrightnessController& brightnessController,
                        Pinetime::Controllers::TouchHandler& touchHandler,
-                       Pinetime::Controllers::FS& filesystem)
+                       Pinetime::Controllers::FS& filesystem,
+                       Pinetime::Drivers::SpiNorFlash& spiNorFlash)
   : lcd {lcd},
     touchPanel {touchPanel},
     batteryController {batteryController},
@@ -97,6 +98,7 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
     brightnessController {brightnessController},
     touchHandler {touchHandler},
     filesystem {filesystem},
+    spiNorFlash {spiNorFlash},
     lvgl {lcd, filesystem},
     timer(this, TimerCallback),
     controllers {batteryController,
@@ -154,6 +156,36 @@ void DisplayApp::InitHw() {
   lcd.Init();
 }
 
+TickType_t DisplayApp::CalculateSleepTime() {
+  TickType_t ticksElapsed = xTaskGetTickCount() - alwaysOnStartTime;
+  // Divide both the numerator and denominator by 8 to increase the number of ticks (frames) before the overflow tick is reached
+  TickType_t elapsedTarget = ROUNDED_DIV((configTICK_RATE_HZ / 8) * alwaysOnTickCount * alwaysOnRefreshPeriod, 1000 / 8);
+  // ROUNDED_DIV overflows when numerator + (denominator floordiv 2) > uint32 max
+  // in this case around 9 hours
+  constexpr TickType_t overflowTick = (UINT32_MAX - (1000 / 16)) / ((configTICK_RATE_HZ / 8) * alwaysOnRefreshPeriod);
+
+  // Assumptions
+
+  // Tick rate is multiple of 8
+  // Needed for division trick above
+  static_assert(configTICK_RATE_HZ % 8 == 0);
+
+  // Local tick count must always wraparound before the system tick count does
+  // As a static assert we can use 64 bit ints and therefore dodge overflows
+  // Always on overflow time (ms) < system tick overflow time (ms)
+  static_assert((uint64_t) overflowTick * (uint64_t) alwaysOnRefreshPeriod < (uint64_t) UINT32_MAX * 1000ULL / configTICK_RATE_HZ);
+
+  if (alwaysOnTickCount == overflowTick) {
+    alwaysOnTickCount = 0;
+    alwaysOnStartTime = xTaskGetTickCount();
+  }
+  if (elapsedTarget > ticksElapsed) {
+    return elapsedTarget - ticksElapsed;
+  } else {
+    return 0;
+  }
+}
+
 void DisplayApp::Refresh() {
   auto LoadPreviousScreen = [this]() {
     FullRefreshDirections returnDirection;
@@ -203,7 +235,29 @@ void DisplayApp::Refresh() {
   TickType_t queueTimeout;
   switch (state) {
     case States::Idle:
-      queueTimeout = portMAX_DELAY;
+      if (settingsController.GetAlwaysOnDisplay()) {
+        if (!currentScreen->IsRunning()) {
+          LoadPreviousScreen();
+        }
+        // Check we've slept long enough
+        // Might not be true if the loop received an event
+        // If not true, then wait that amount of time
+        queueTimeout = CalculateSleepTime();
+        if (queueTimeout == 0) {
+          // Only advance the tick count when LVGL is done
+          // Otherwise keep running the task handler while it still has things to draw
+          // Note: under high graphics load, LVGL will always have more work to do
+          if (lv_task_handler() > 0) {
+            // Drop frames that we've missed if drawing/event handling took way longer than expected
+            while (queueTimeout == 0) {
+              alwaysOnTickCount += 1;
+              queueTimeout = CalculateSleepTime();
+            }
+          };
+        }
+      } else {
+        queueTimeout = portMAX_DELAY;
+      }
       break;
     case States::Running:
       if (!currentScreen->IsRunning()) {
@@ -234,20 +288,34 @@ void DisplayApp::Refresh() {
       case Messages::DimScreen:
         DimScreen();
         break;
-      case Messages::RestoreBrightness:
-        RestoreBrightness();
-        break;
       case Messages::GoToSleep:
-        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
+        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Low) {
           brightnessController.Lower();
           vTaskDelay(100);
         }
-        lcd.Sleep();
+        // Don't actually turn off the display for AlwaysOn mode
+        if (settingsController.GetAlwaysOnDisplay()) {
+          brightnessController.Set(Controllers::BrightnessController::Levels::AlwaysOn);
+          lcd.LowPowerOn();
+          // Record idle entry time
+          alwaysOnTickCount = 0;
+          alwaysOnStartTime = xTaskGetTickCount();
+        } else {
+          brightnessController.Set(Controllers::BrightnessController::Levels::Off);
+          lcd.Sleep();
+        }
         PushMessageToSystemTask(Pinetime::System::Messages::OnDisplayTaskSleeping);
         state = States::Idle;
         break;
+      case Messages::NotifyDeviceActivity:
+        lv_disp_trig_activity(nullptr);
+        break;
       case Messages::GoToRunning:
-        lcd.Wakeup();
+        if (settingsController.GetAlwaysOnDisplay()) {
+          lcd.LowPowerOff();
+        } else {
+          lcd.Wakeup();
+        }
         lv_disp_trig_activity(nullptr);
         ApplyBrightness();
         state = States::Running;
@@ -436,7 +504,7 @@ void DisplayApp::LoadScreen(Apps app, DisplayApp::FullRefreshDirections directio
     case Apps::Clock: {
       const auto* watchFace =
         std::find_if(userWatchFaces.begin(), userWatchFaces.end(), [this](const WatchFaceDescription& watchfaceDescription) {
-          return watchfaceDescription.watchFace == settingsController.GetWatchFace();
+          return std::strcmp(watchfaceDescription.name, settingsController.GetWatchFace()) == 0;
         });
       if (watchFace != userWatchFaces.end())
         currentScreen.reset(watchFace->create(controllers));
@@ -492,8 +560,7 @@ void DisplayApp::LoadScreen(Apps app, DisplayApp::FullRefreshDirections directio
       std::array<Screens::SettingWatchFace::Item, UserWatchFaceTypes::Count> items;
       int i = 0;
       for (const auto& userWatchFace : userWatchFaces) {
-        items[i++] =
-          Screens::SettingWatchFace::Item {userWatchFace.name, userWatchFace.watchFace, userWatchFace.isAvailable(controllers.filesystem)};
+        items[i++] = Screens::SettingWatchFace::Item {userWatchFace.name, userWatchFace.isAvailable(controllers.filesystem)};
       }
       currentScreen = std::make_unique<Screens::SettingWatchFace>(this, std::move(items), settingsController, filesystem);
     } break;
@@ -535,7 +602,8 @@ void DisplayApp::LoadScreen(Apps app, DisplayApp::FullRefreshDirections directio
                                                             bleController,
                                                             watchdog,
                                                             motionController,
-                                                            touchPanel);
+                                                            touchPanel,
+                                                            spiNorFlash);
       break;
     case Apps::FlashLight:
       currentScreen = std::make_unique<Screens::FlashLight>(*systemTask, brightnessController);

src/displayapp/DisplayApp.h

@@ -66,7 +66,8 @@ namespace Pinetime {
                  Pinetime::Controllers::AlarmController& alarmController,
                  Pinetime::Controllers::BrightnessController& brightnessController,
                  Pinetime::Controllers::TouchHandler& touchHandler,
-                 Pinetime::Controllers::FS& filesystem);
+                 Pinetime::Controllers::FS& filesystem,
+                 Pinetime::Drivers::SpiNorFlash& spiNorFlash);
       void Start(System::BootErrors error);
       void PushMessage(Display::Messages msg);
 
@@ -96,6 +97,7 @@ namespace Pinetime {
       Pinetime::Controllers::BrightnessController& brightnessController;
       Pinetime::Controllers::TouchHandler& touchHandler;
       Pinetime::Controllers::FS& filesystem;
+      Pinetime::Drivers::SpiNorFlash& spiNorFlash;
 
       Pinetime::Controllers::FirmwareValidator validator;
       Pinetime::Components::LittleVgl lvgl;
@@ -135,6 +137,13 @@ namespace Pinetime {
       Utility::StaticStack<FullRefreshDirections, returnAppStackSize> appStackDirections;
 
       bool isDimmed = false;
+
+      TickType_t CalculateSleepTime();
+      TickType_t alwaysOnTickCount;
+      TickType_t alwaysOnStartTime;
+      // If this is to be changed, make sure the actual always on refresh rate is changed
+      // by configuring the LCD refresh timings
+      static constexpr uint32_t alwaysOnRefreshPeriod = 500;
     };
   }
 }

src/displayapp/DisplayAppRecovery.cpp

@@ -24,7 +24,8 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
                        Pinetime::Controllers::AlarmController& /*alarmController*/,
                        Pinetime::Controllers::BrightnessController& /*brightnessController*/,
                        Pinetime::Controllers::TouchHandler& /*touchHandler*/,
-                       Pinetime::Controllers::FS& /*filesystem*/)
+                       Pinetime::Controllers::FS& /*filesystem*/,
+                       Pinetime::Drivers::SpiNorFlash& /*spiNorFlash*/)
   : lcd {lcd}, bleController {bleController} {
 }
 

src/displayapp/DisplayAppRecovery.h

@@ -18,6 +18,7 @@ namespace Pinetime {
     class St7789;
     class Cst816S;
     class Watchdog;
+    class SpiNorFlash;
   }
 
   namespace Controllers {
@@ -59,7 +60,8 @@ namespace Pinetime {
                  Pinetime::Controllers::AlarmController& alarmController,
                  Pinetime::Controllers::BrightnessController& brightnessController,
                  Pinetime::Controllers::TouchHandler& touchHandler,
-                 Pinetime::Controllers::FS& filesystem);
+                 Pinetime::Controllers::FS& filesystem,
+                 Pinetime::Drivers::SpiNorFlash& spiNorFlash);
       void Start();
 
       void Start(Pinetime::System::BootErrors) {

src/displayapp/Messages.h

@@ -18,7 +18,7 @@ namespace Pinetime {
         TimerDone,
         BleFirmwareUpdateStarted,
         DimScreen,
-        RestoreBrightness,
+        NotifyDeviceActivity,
         ShowPairingKey,
         AlarmTriggered,
         Chime,

src/displayapp/UserApps.h.in

@@ -1,19 +1,13 @@
 #pragma once
 #include "displayapp/apps/Apps.h"
-#include "Controllers.h"
+#include "displayapp/Controllers.h"
 
 #include "displayapp/screens/Alarm.h"
 #include "displayapp/screens/Dice.h"
 #include "displayapp/screens/Timer.h"
 #include "displayapp/screens/Twos.h"
 #include "displayapp/screens/Tile.h"
-#include "displayapp/screens/ApplicationList.h"
-#include "displayapp/screens/WatchFaceDigital.h"
-#include "displayapp/screens/WatchFaceAnalog.h"
-#include "displayapp/screens/WatchFaceCasioStyleG7710.h"
-#include "displayapp/screens/WatchFaceInfineat.h"
-#include "displayapp/screens/WatchFacePineTimeStyle.h"
-#include "displayapp/screens/WatchFaceTerminal.h"
+@WATCHFACE_INCLUDE@
 
 namespace Pinetime {
   namespace Applications {
@@ -28,7 +22,6 @@ namespace Pinetime {
     };
 
     struct WatchFaceDescription {
-      WatchFace watchFace;
       const char* name;
       Screens::Screen* (*create)(AppControllers& controllers);
       bool (*isAvailable)(Controllers::FS& fileSystem);
@@ -39,9 +32,11 @@ namespace Pinetime {
       return {AppTraits<t>::app, AppTraits<t>::icon, &AppTraits<t>::Create};
     }
 
-    template <WatchFace t>
+    template <class t>
     consteval WatchFaceDescription CreateWatchFaceDescription() {
-      return {WatchFaceTraits<t>::watchFace, WatchFaceTraits<t>::name, &WatchFaceTraits<t>::Create, &WatchFaceTraits<t>::IsAvailable};
+      static_assert(std::char_traits<char>::length(WatchFaceTraits<t>::name) < 16,
+                    "The name of the watch faces is limited to 15 characters max");
+      return {WatchFaceTraits<t>::name, &WatchFaceTraits<t>::Create, &WatchFaceTraits<t>::IsAvailable};
     }
 
     template <template <Apps...> typename T, Apps... ts>
@@ -49,7 +44,7 @@ namespace Pinetime {
       return {CreateAppDescription<ts>()...};
     }
 
-    template <template <WatchFace...> typename T, WatchFace... ts>
+    template <template <class...> typename T, class... ts>
     consteval std::array<WatchFaceDescription, sizeof...(ts)> CreateWatchFaceDescriptions(T<ts...>) {
       return {CreateWatchFaceDescription<ts>()...};
     }

src/displayapp/apps/Apps.h.in

@@ -45,35 +45,14 @@ namespace Pinetime {
       Error
     };
 
-    enum class WatchFace : uint8_t {
-      Digital,
-      Analog,
-      PineTimeStyle,
-      Terminal,
-      Infineat,
-      CasioStyleG7710,
-    };
-
     template <Apps>
     struct AppTraits {};
 
-    template <WatchFace>
-    struct WatchFaceTraits {};
-
     template <Apps... As>
     struct TypeList {
       static constexpr size_t Count = sizeof...(As);
     };
 
     using UserAppTypes = TypeList<@USERAPP_TYPES@>;
-
-    template <WatchFace... Ws>
-    struct WatchFaceTypeList {
-      static constexpr size_t Count = sizeof...(Ws);
-    };
-
-    using UserWatchFaceTypes = WatchFaceTypeList<@WATCHFACE_TYPES@>;
-
-    static_assert(UserWatchFaceTypes::Count >= 1);
   }
 }

src/displayapp/apps/CMakeLists.txt

@@ -19,20 +19,47 @@ else ()
 endif ()
 
 if(DEFINED ENABLE_WATCHFACES)
-    set(WATCHFACE_TYPES ${ENABLE_WATCHFACES} CACHE STRING "List of watch faces to build into the firmware")
-else()
-    set(DEFAULT_WATCHFACE_TYPES "WatchFace::Digital")
-    set(DEFAULT_WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}, WatchFace::Analog")
-    set(DEFAULT_WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}, WatchFace::PineTimeStyle")
-    set(DEFAULT_WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}, WatchFace::Terminal")
-    set(DEFAULT_WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}, WatchFace::Infineat")
-    set(DEFAULT_WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}, WatchFace::CasioStyleG7710")
-    set(WATCHFACE_TYPES "${DEFAULT_WATCHFACE_TYPES}" CACHE STRING "List of watch faces to build into the firmware")
-endif()
+    set(DEFAULT_WATCHFACE_TYPES ${ENABLE_WATCHFACES})
+else ()
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFaceDigital")
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFaceAnalog")
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFacePineTimeStyle")
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFaceTerminal")
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFaceInfineat")
+    list(APPEND DEFAULT_WATCHFACE_TYPES "Pinetime::Applications::Screens::WatchFaceCasioStyleG7710")
+endif ()
+
+# Generate the list of watchface types necessary to instantiate WatchFaceTypeList<> needed in WatchFace.h
+set(FIRST_ITERATION TRUE)
+foreach (watchface IN LISTS DEFAULT_WATCHFACE_TYPES)
+    if (${FIRST_ITERATION})
+        string(APPEND WATCHFACE_TYPES "${watchface}")
+        set(FIRST_ITERATION FALSE)
+    else ()
+        string(APPEND WATCHFACE_TYPES ", ${watchface}")
+    endif ()
+endforeach ()
+
+# Generate the forward declarations needed in WatchFace.h
+foreach (w IN LISTS DEFAULT_WATCHFACE_TYPES)
+    string(FIND ${w} "::" classIndex REVERSE)
+    string(LENGTH ${w} watchfaceFullLength)
+    math(EXPR watchfaceLength "${watchfaceFullLength} - (${classIndex} + 2)")
+    math(EXPR beginIndex "${classIndex}+2")
+    string(SUBSTRING ${w} ${beginIndex} ${watchfaceLength} className)
+    string(SUBSTRING ${w} 0 ${classIndex} namespaceName)
+    string(APPEND WATCHFACE_NAMESPACE "namespace ${namespaceName} { class ${className}; }\n")
+
+    # TODO the include path should be specified by the CMake file of the watchface
+    string(APPEND WATCHFACE_INCLUDE "#include \"displayapp/screens/${className}.h\"\n")
+endforeach ()
 
 add_library(infinitime_apps INTERFACE)
 target_sources(infinitime_apps INTERFACE "${CMAKE_CURRENT_BINARY_DIR}/Apps.h")
 target_include_directories(infinitime_apps INTERFACE "${CMAKE_CURRENT_BINARY_DIR}/")
+target_include_directories(infinitime_apps INTERFACE "${CMAKE_CURRENT_BINARY_DIR}/../")
 
 # Generate the list of user apps to be compiled into the firmware
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Apps.h.in ${CMAKE_CURRENT_BINARY_DIR}/Apps.h)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/WatchFaces.h.in ${CMAKE_CURRENT_BINARY_DIR}/WatchFaces.h)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/../UserApps.h.in ${CMAKE_CURRENT_BINARY_DIR}/../UserApps.h)

src/displayapp/apps/WatchFaces.h.in

@@ -0,0 +1,22 @@
+#pragma once
+#include <cstddef>
+#include <cstdint>
+
+@WATCHFACE_NAMESPACE@
+namespace Pinetime {
+  namespace Applications {
+    static constexpr size_t MaxWatchFaceNameSize = 15;
+
+    template <class T>
+    struct WatchFaceTraits {};
+
+    template <class... Ws>
+    struct WatchFaceTypeList {
+      static constexpr size_t Count = sizeof...(Ws);
+    };
+
+    using UserWatchFaceTypes = WatchFaceTypeList<@WATCHFACE_TYPES@>;
+
+    static_assert(UserWatchFaceTypes::Count >= 1);
+  }
+}

src/displayapp/screens/ApplicationList.h

@@ -2,7 +2,6 @@
 
 #include <array>
 #include <memory>
-#include "displayapp/apps/Apps.h"
 #include "Screen.h"
 #include "ScreenList.h"
 #include "displayapp/Controllers.h"

src/displayapp/screens/CheckboxList.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "displayapp/apps/Apps.h"
 #include "displayapp/screens/Screen.h"
 #include <array>
 #include <cstdint>

src/displayapp/screens/FlashLight.cpp

@@ -17,6 +17,7 @@ namespace {
 FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessController& brightnessController)
   : systemTask {systemTask}, brightnessController {brightnessController} {
 
+  previousBrightnessLevel = brightnessController.Level();
   brightnessController.Set(Controllers::BrightnessController::Levels::Low);
 
   flashLight = lv_label_create(lv_scr_act(), nullptr);
@@ -52,6 +53,7 @@ FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessCo
 FlashLight::~FlashLight() {
   lv_obj_clean(lv_scr_act());
   lv_obj_set_style_local_bg_color(lv_scr_act(), LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  brightnessController.Set(previousBrightnessLevel);
   systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
 }
 

src/displayapp/screens/FlashLight.h

@@ -27,6 +27,7 @@ namespace Pinetime {
         Controllers::BrightnessController& brightnessController;
 
         Controllers::BrightnessController::Levels brightnessLevel = Controllers::BrightnessController::Levels::High;
+        Controllers::BrightnessController::Levels previousBrightnessLevel;
 
         lv_obj_t* flashLight;
         lv_obj_t* backgroundAction;

src/displayapp/screens/List.h

@@ -5,7 +5,6 @@
 #include <array>
 #include "displayapp/screens/Screen.h"
 #include "displayapp/widgets/PageIndicator.h"
-#include "displayapp/apps/Apps.h"
 #include "components/settings/Settings.h"
 
 #define MAXLISTITEMS 4

src/displayapp/screens/SystemInfo.cpp

@@ -38,7 +38,8 @@ SystemInfo::SystemInfo(Pinetime::Applications::DisplayApp* app,
                        const Pinetime::Controllers::Ble& bleController,
                        const Pinetime::Drivers::Watchdog& watchdog,
                        Pinetime::Controllers::MotionController& motionController,
-                       const Pinetime::Drivers::Cst816S& touchPanel)
+                       const Pinetime::Drivers::Cst816S& touchPanel,
+                       const Pinetime::Drivers::SpiNorFlash& spiNorFlash)
   : app {app},
     dateTimeController {dateTimeController},
     batteryController {batteryController},
@@ -47,6 +48,7 @@ SystemInfo::SystemInfo(Pinetime::Applications::DisplayApp* app,
     watchdog {watchdog},
     motionController {motionController},
     touchPanel {touchPanel},
+    spiNorFlash {spiNorFlash},
     screens {app,
              0,
              {[this]() -> std::unique_ptr<Screen> {
@@ -186,10 +188,12 @@ std::unique_ptr<Screen> SystemInfo::CreateScreen3() {
   lv_obj_t* label = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(label, true);
   const auto& bleAddr = bleController.Address();
+  auto spiFlashId = spiNorFlash.GetIdentification();
   lv_label_set_text_fmt(label,
                         "#808080 BLE MAC#\n"
-                        " %02x:%02x:%02x:%02x:%02x:%02x"
+                        " %02x:%02x:%02x:%02x:%02x:%02x\n"
                         "\n"
+                        "#808080 SPI Flash# %02x-%02x-%02x\n"
                         "\n"
                         "#808080 Memory heap#\n"
                         " #808080 Free# %d\n"
@@ -202,6 +206,9 @@ std::unique_ptr<Screen> SystemInfo::CreateScreen3() {
                         bleAddr[2],
                         bleAddr[1],
                         bleAddr[0],
+                        spiFlashId.manufacturer,
+                        spiFlashId.type,
+                        spiFlashId.density,
                         xPortGetFreeHeapSize(),
                         xPortGetMinimumEverFreeHeapSize(),
                         mallocFailedCount,

src/displayapp/screens/SystemInfo.h

@@ -29,7 +29,8 @@ namespace Pinetime {
                             const Pinetime::Controllers::Ble& bleController,
                             const Pinetime::Drivers::Watchdog& watchdog,
                             Pinetime::Controllers::MotionController& motionController,
-                            const Pinetime::Drivers::Cst816S& touchPanel);
+                            const Pinetime::Drivers::Cst816S& touchPanel,
+                            const Pinetime::Drivers::SpiNorFlash& spiNorFlash);
         ~SystemInfo() override;
         bool OnTouchEvent(TouchEvents event) override;
 
@@ -42,6 +43,7 @@ namespace Pinetime {
         const Pinetime::Drivers::Watchdog& watchdog;
         Pinetime::Controllers::MotionController& motionController;
         const Pinetime::Drivers::Cst816S& touchPanel;
+        const Pinetime::Drivers::SpiNorFlash& spiNorFlash;
 
         ScreenList<5> screens;
 

src/displayapp/screens/Tile.h

@@ -4,7 +4,6 @@
 #include <cstdint>
 #include <memory>
 #include "displayapp/screens/Screen.h"
-#include "displayapp/apps/Apps.h"
 #include "components/datetime/DateTimeController.h"
 #include "components/settings/Settings.h"
 #include "components/battery/BatteryController.h"

src/displayapp/screens/WatchFaceAnalog.h

@@ -11,6 +11,7 @@
 #include "components/ble/NotificationManager.h"
 #include "displayapp/screens/BatteryIcon.h"
 #include "utility/DirtyValue.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -89,8 +90,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::Analog> {
-      static constexpr WatchFace watchFace = WatchFace::Analog;
+    struct WatchFaceTraits<Screens::WatchFaceAnalog> {
       static constexpr const char* name = "Analog face";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/WatchFaceCasioStyleG7710.h

@@ -10,7 +10,7 @@
 #include "components/datetime/DateTimeController.h"
 #include "components/ble/BleController.h"
 #include "utility/DirtyValue.h"
-#include "displayapp/apps/Apps.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -103,8 +103,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::CasioStyleG7710> {
-      static constexpr WatchFace watchFace = WatchFace::CasioStyleG7710;
+    struct WatchFaceTraits<Screens::WatchFaceCasioStyleG7710> {
       static constexpr const char* name = "Casio G7710";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/WatchFaceDigital.h

@@ -10,7 +10,7 @@
 #include "components/ble/BleController.h"
 #include "displayapp/widgets/StatusIcons.h"
 #include "utility/DirtyValue.h"
-#include "displayapp/apps/Apps.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -76,8 +76,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::Digital> {
-      static constexpr WatchFace watchFace = WatchFace::Digital;
+    struct WatchFaceTraits<Screens::WatchFaceDigital> {
       static constexpr const char* name = "Digital face";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/WatchFaceInfineat.h

@@ -8,7 +8,7 @@
 #include "displayapp/screens/Screen.h"
 #include "components/datetime/DateTimeController.h"
 #include "utility/DirtyValue.h"
-#include "displayapp/apps/Apps.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -101,8 +101,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::Infineat> {
-      static constexpr WatchFace watchFace = WatchFace::Infineat;
+    struct WatchFaceTraits<Screens::WatchFaceInfineat> {
       static constexpr const char* name = "Infineat face";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/WatchFacePineTimeStyle.h

@@ -12,6 +12,7 @@
 #include "components/ble/SimpleWeatherService.h"
 #include "components/ble/BleController.h"
 #include "utility/DirtyValue.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -122,8 +123,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::PineTimeStyle> {
-      static constexpr WatchFace watchFace = WatchFace::PineTimeStyle;
+    struct WatchFaceTraits<Screens::WatchFacePineTimeStyle> {
       static constexpr const char* name = "PineTimeStyle";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/WatchFaceTerminal.h

@@ -8,6 +8,7 @@
 #include "displayapp/screens/Screen.h"
 #include "components/datetime/DateTimeController.h"
 #include "utility/DirtyValue.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -70,8 +71,7 @@ namespace Pinetime {
     }
 
     template <>
-    struct WatchFaceTraits<WatchFace::Terminal> {
-      static constexpr WatchFace watchFace = WatchFace::Terminal;
+    struct WatchFaceTraits<Screens::WatchFaceTerminal> {
       static constexpr const char* name = "Terminal";
 
       static Screens::Screen* Create(AppControllers& controllers) {

src/displayapp/screens/settings/SettingDisplay.cpp

@@ -9,10 +9,17 @@
 using namespace Pinetime::Applications::Screens;
 
 namespace {
-  void event_handler(lv_obj_t* obj, lv_event_t event) {
+  void TimeoutEventHandler(lv_obj_t* obj, lv_event_t event) {
     auto* screen = static_cast<SettingDisplay*>(obj->user_data);
     screen->UpdateSelected(obj, event);
   }
+
+  void AlwaysOnEventHandler(lv_obj_t* obj, lv_event_t event) {
+    if (event == LV_EVENT_VALUE_CHANGED) {
+      auto* screen = static_cast<SettingDisplay*>(obj->user_data);
+      screen->ToggleAlwaysOn();
+    }
+  }
 }
 
 constexpr std::array<uint16_t, 6> SettingDisplay::options;
@@ -49,13 +56,20 @@ SettingDisplay::SettingDisplay(Pinetime::Applications::DisplayApp* app, Pinetime
     snprintf(buffer, sizeof(buffer), "%2" PRIu16 "s", options[i] / 1000);
     lv_checkbox_set_text(cbOption[i], buffer);
     cbOption[i]->user_data = this;
-    lv_obj_set_event_cb(cbOption[i], event_handler);
+    lv_obj_set_event_cb(cbOption[i], TimeoutEventHandler);
     SetRadioButtonStyle(cbOption[i]);
 
     if (settingsController.GetScreenTimeOut() == options[i]) {
       lv_checkbox_set_checked(cbOption[i], true);
     }
   }
+
+  alwaysOnCheckbox = lv_checkbox_create(container1, nullptr);
+  lv_checkbox_set_text(alwaysOnCheckbox, "Always On");
+  lv_checkbox_set_checked(alwaysOnCheckbox, settingsController.GetAlwaysOnDisplaySetting());
+  lv_obj_add_state(alwaysOnCheckbox, LV_STATE_DEFAULT);
+  alwaysOnCheckbox->user_data = this;
+  lv_obj_set_event_cb(alwaysOnCheckbox, AlwaysOnEventHandler);
 }
 
 SettingDisplay::~SettingDisplay() {
@@ -63,6 +77,11 @@ SettingDisplay::~SettingDisplay() {
   settingsController.SaveSettings();
 }
 
+void SettingDisplay::ToggleAlwaysOn() {
+  settingsController.SetAlwaysOnDisplaySetting(!settingsController.GetAlwaysOnDisplaySetting());
+  lv_checkbox_set_checked(alwaysOnCheckbox, settingsController.GetAlwaysOnDisplaySetting());
+}
+
 void SettingDisplay::UpdateSelected(lv_obj_t* object, lv_event_t event) {
   if (event == LV_EVENT_CLICKED) {
     for (unsigned int i = 0; i < options.size(); i++) {

src/displayapp/screens/settings/SettingDisplay.h

@@ -18,6 +18,7 @@ namespace Pinetime {
         ~SettingDisplay() override;
 
         void UpdateSelected(lv_obj_t* object, lv_event_t event);
+        void ToggleAlwaysOn();
 
       private:
         DisplayApp* app;
@@ -25,6 +26,7 @@ namespace Pinetime {
 
         Controllers::Settings& settingsController;
         lv_obj_t* cbOption[options.size()];
+        lv_obj_t* alwaysOnCheckbox;
       };
     }
   }

src/displayapp/screens/settings/SettingWatchFace.cpp

@@ -12,12 +12,12 @@ constexpr const char* SettingWatchFace::symbol;
 namespace {
   uint32_t IndexOf(const std::array<Pinetime::Applications::Screens::SettingWatchFace::Item,
                                     Pinetime::Applications::UserWatchFaceTypes::Count>& watchfaces,
-                   Pinetime::Applications::WatchFace watchface) {
+                   const char* watchface) {
     size_t index = 0;
     auto found = std::find_if(watchfaces.begin(),
                               watchfaces.end(),
-                              [&index, &watchface](const Pinetime::Applications::Screens::SettingWatchFace::Item& item) {
-                                const bool result = item.watchface == watchface;
+                              [&index, watchface](const Pinetime::Applications::Screens::SettingWatchFace::Item& item) {
+                                const bool result = (std::strcmp(item.name, watchface) == 0);
                                 if (!result) {
                                   index++;
                                 }
@@ -30,13 +30,13 @@ namespace {
     return index;
   }
 
-  Pinetime::Applications::WatchFace IndexToWatchFace(const std::array<Pinetime::Applications::Screens::SettingWatchFace::Item,
-                                                                      Pinetime::Applications::UserWatchFaceTypes::Count>& watchfaces,
+  const char* IndexToWatchFace(const std::array<Pinetime::Applications::Screens::SettingWatchFace::Item,
+                                                Pinetime::Applications::UserWatchFaceTypes::Count>& watchfaces,
                                                      size_t index) {
     if (index >= watchfaces.size()) {
-      return watchfaces[0].watchface;
+      return watchfaces[0].name;
     }
-    return watchfaces[index].watchface;
+    return watchfaces[index].name;
   }
 }
 

src/displayapp/screens/settings/SettingWatchFace.h

@@ -11,6 +11,7 @@
 #include "displayapp/screens/CheckboxList.h"
 #include "displayapp/screens/WatchFaceInfineat.h"
 #include "displayapp/screens/WatchFaceCasioStyleG7710.h"
+#include "displayapp/apps/WatchFaces.h"
 
 namespace Pinetime {
 
@@ -21,7 +22,6 @@ namespace Pinetime {
       public:
         struct Item {
           const char* name;
-          WatchFace watchface;
           bool enabled;
         };
 

src/drivers/SpiNorFlash.cpp

@@ -10,7 +10,7 @@ SpiNorFlash::SpiNorFlash(Spi& spi) : spi {spi} {
 }
 
 void SpiNorFlash::Init() {
-  device_id = ReadIdentificaion();
+  device_id = ReadIdentification();
   NRF_LOG_INFO("[SpiNorFlash] Manufacturer : %d, Memory type : %d, memory density : %d",
                device_id.manufacturer,
                device_id.type,
@@ -32,7 +32,7 @@ void SpiNorFlash::Wakeup() {
   uint8_t cmd[cmdSize] = {static_cast<uint8_t>(Commands::ReleaseFromDeepPowerDown), 0x01, 0x02, 0x03};
   uint8_t id = 0;
   spi.Read(reinterpret_cast<uint8_t*>(&cmd), cmdSize, &id, 1);
-  auto devId = device_id = ReadIdentificaion();
+  auto devId = device_id = ReadIdentification();
   if (devId.type != device_id.type) {
     NRF_LOG_INFO("[SpiNorFlash] ID on Wakeup: Failed");
   } else {
@@ -41,7 +41,7 @@ void SpiNorFlash::Wakeup() {
   NRF_LOG_INFO("[SpiNorFlash] Wakeup")
 }
 
-SpiNorFlash::Identification SpiNorFlash::ReadIdentificaion() {
+SpiNorFlash::Identification SpiNorFlash::ReadIdentification() {
   auto cmd = static_cast<uint8_t>(Commands::ReadIdentification);
   Identification identification;
   spi.Read(&cmd, 1, reinterpret_cast<uint8_t*>(&identification), sizeof(Identification));
@@ -145,3 +145,7 @@ void SpiNorFlash::Write(uint32_t address, const uint8_t* buffer, size_t size) {
     len -= toWrite;
   }
 }
+
+SpiNorFlash::Identification SpiNorFlash::GetIdentification() const {
+  return device_id;
+}

src/drivers/SpiNorFlash.h

@@ -20,7 +20,6 @@ namespace Pinetime {
         uint8_t density = 0;
       };
 
-      Identification ReadIdentificaion();
       uint8_t ReadStatusRegister();
       bool WriteInProgress();
       bool WriteEnabled();
@@ -33,6 +32,8 @@ namespace Pinetime {
       bool ProgramFailed();
       bool EraseFailed();
 
+      Identification GetIdentification() const;
+
       void Init();
       void Uninit();
 
@@ -40,6 +41,8 @@ namespace Pinetime {
       void Wakeup();
 
     private:
+      Identification ReadIdentification();
+
       enum class Commands : uint8_t {
         PageProgram = 0x02,
         Read = 0x03,

src/drivers/St7789.cpp

@@ -16,6 +16,7 @@ void St7789::Init() {
   nrf_gpio_pin_set(pinReset);
   HardwareReset();
   SoftwareReset();
+  Command2Enable();
   SleepOut();
   PixelFormat();
   MemoryDataAccessControl();
@@ -24,8 +25,13 @@ void St7789::Init() {
 #ifndef DRIVER_DISPLAY_MIRROR
   DisplayInversionOn();
 #endif
+  PorchSet();
+  FrameRateNormalSet();
+  IdleFrameRateOff();
   NormalModeOn();
   SetVdv();
+  PowerControl();
+  GateControl();
   DisplayOn();
 }
 
@@ -63,6 +69,17 @@ void St7789::SoftwareReset() {
   vTaskDelay(pdMS_TO_TICKS(125));
 }
 
+void St7789::Command2Enable() {
+  WriteCommand(static_cast<uint8_t>(Commands::Command2Enable));
+  constexpr uint8_t args[] = {
+    0x5a, // Constant
+    0x69, // Constant
+    0x02, // Constant
+    0x01, // Enable
+  };
+  WriteData(args, sizeof(args));
+}
+
 void St7789::SleepOut() {
   if (!sleepIn) {
     return;
@@ -127,10 +144,79 @@ void St7789::NormalModeOn() {
   WriteCommand(static_cast<uint8_t>(Commands::NormalModeOn));
 }
 
+void St7789::IdleModeOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::IdleModeOn));
+}
+
+void St7789::IdleModeOff() {
+  WriteCommand(static_cast<uint8_t>(Commands::IdleModeOff));
+}
+
+void St7789::PorchSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::Porch));
+  constexpr uint8_t args[] = {
+    0x02, // Normal mode front porch
+    0x03, // Normal mode back porch
+    0x01, // Porch control enable
+    0xed, // Idle mode front:back porch
+    0xed, // Partial mode front:back porch (partial mode unused but set anyway)
+  };
+  WriteData(args, sizeof(args));
+}
+
+void St7789::FrameRateNormalSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateNormal));
+  // Note that the datasheet table is imprecise - see formula below table
+  WriteData(0x0a);
+}
+
+void St7789::IdleFrameRateOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateIdle));
+  // According to the datasheet, these controls should apply only to partial/idle mode
+  // However they appear to apply to normal mode, so we have to enable/disable
+  // every time we enter/exit always on
+  // In testing this divider appears to actually be 16x?
+  constexpr uint8_t args[] = {
+    0x13, // Enable frame rate control for partial/idle mode, 8x frame divider
+    0x1e, // Idle mode frame rate
+    0x1e, // Partial mode frame rate (unused)
+  };
+  WriteData(args, sizeof(args));
+}
+
+void St7789::IdleFrameRateOff() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateIdle));
+  constexpr uint8_t args[] = {
+    0x00, // Disable frame rate control and divider
+    0x0a, // Idle mode frame rate (normal)
+    0x0a, // Partial mode frame rate (normal, unused)
+  };
+  WriteData(args, sizeof(args));
+}
+
 void St7789::DisplayOn() {
   WriteCommand(static_cast<uint8_t>(Commands::DisplayOn));
 }
 
+void St7789::PowerControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl1));
+  constexpr uint8_t args[] = {
+    0xa4, // Constant
+    0x00, // Lowest possible voltages
+  };
+  WriteData(args, sizeof(args));
+
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl2));
+  // Lowest possible boost circuit clocks
+  WriteData(0xb3);
+}
+
+void St7789::GateControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::GateControl));
+  // Lowest possible VGL/VGH
+  WriteData(0x00);
+}
+
 void St7789::SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
   WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
   uint8_t colArgs[] = {
@@ -198,6 +284,18 @@ void St7789::HardwareReset() {
   vTaskDelay(pdMS_TO_TICKS(125));
 }
 
+void St7789::LowPowerOn() {
+  IdleModeOn();
+  IdleFrameRateOn();
+  NRF_LOG_INFO("[LCD] Low power mode");
+}
+
+void St7789::LowPowerOff() {
+  IdleModeOff();
+  IdleFrameRateOff();
+  NRF_LOG_INFO("[LCD] Normal power mode");
+}
+
 void St7789::Sleep() {
   SleepIn();
   nrf_gpio_cfg_default(pinDataCommand);

src/drivers/St7789.h

@@ -24,6 +24,8 @@ namespace Pinetime {
 
       void DrawBuffer(uint16_t x, uint16_t y, uint16_t width, uint16_t height, const uint8_t* data, size_t size);
 
+      void LowPowerOn();
+      void LowPowerOff();
       void Sleep();
       void Wakeup();
 
@@ -37,6 +39,7 @@ namespace Pinetime {
 
       void HardwareReset();
       void SoftwareReset();
+      void Command2Enable();
       void SleepOut();
       void EnsureSleepOutPostDelay();
       void SleepIn();
@@ -45,8 +48,16 @@ namespace Pinetime {
       void DisplayInversionOn();
       void NormalModeOn();
       void WriteToRam(const uint8_t* data, size_t size);
+      void IdleModeOn();
+      void IdleModeOff();
+      void FrameRateNormalSet();
+      void IdleFrameRateOff();
+      void IdleFrameRateOn();
       void DisplayOn();
       void DisplayOff();
+      void PowerControl();
+      void GateControl();
+      void PorchSet();
 
       void SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1);
       void SetVdv();
@@ -68,8 +79,17 @@ namespace Pinetime {
         MemoryDataAccessControl = 0x36,
         VerticalScrollDefinition = 0x33,
         VerticalScrollStartAddress = 0x37,
+        IdleModeOff = 0x38,
+        IdleModeOn = 0x39,
         PixelFormat = 0x3a,
+        FrameRateIdle = 0xb3,
+        FrameRateNormal = 0xc6,
         VdvSet = 0xc4,
+        Command2Enable = 0xdf,
+        PowerControl1 = 0xd0,
+        PowerControl2 = 0xe8,
+        GateControl = 0xb7,
+        Porch = 0xb2,
       };
       void WriteData(uint8_t data);
       void WriteData(const uint8_t* data, size_t size);

src/main.cpp

@@ -123,7 +123,8 @@ Pinetime::Applications::DisplayApp displayApp(lcd,
                                               alarmController,
                                               brightnessController,
                                               touchHandler,
-                                              fs);
+                                              fs,
+                                              spiNorFlash);
 
 Pinetime::System::SystemTask systemTask(spi,
                                         spiNorFlash,

src/systemtask/SystemTask.cpp

@@ -102,7 +102,9 @@ void SystemTask::Work() {
   watchdog.Setup(7, Drivers::Watchdog::SleepBehaviour::Run, Drivers::Watchdog::HaltBehaviour::Pause);
   watchdog.Start();
   NRF_LOG_INFO("Last reset reason : %s", Pinetime::Drivers::ResetReasonToString(watchdog.GetResetReason()));
-  APP_GPIOTE_INIT(2);
+  if (!nrfx_gpiote_is_init()) {
+    nrfx_gpiote_init();
+  }
 
   spi.Init();
   spiNorFlash.Init();
@@ -192,13 +194,16 @@ void SystemTask::Work() {
           if (!bleController.IsFirmwareUpdating()) {
             doNotGoToSleep = false;
           }
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           break;
         case Messages::DisableSleeping:
           doNotGoToSleep = true;
           break;
         case Messages::GoToRunning:
-          spi.Wakeup();
+          // 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)) {
@@ -240,7 +245,7 @@ void SystemTask::Work() {
           heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::GoToSleep);
           break;
         case Messages::OnNewTime:
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::UpdateDateTime);
           if (alarmController.State() == Controllers::AlarmController::AlarmState::Set) {
             alarmController.ScheduleAlarm();
@@ -251,7 +256,7 @@ void SystemTask::Work() {
             if (state == SystemTaskState::Sleeping) {
               GoToRunning();
             } else {
-              displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+              displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
             }
             displayApp.PushMessage(Pinetime::Applications::Display::Messages::NewNotification);
           }
@@ -263,7 +268,7 @@ void SystemTask::Work() {
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::AlarmTriggered);
           break;
         case Messages::BleConnected:
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           isBleDiscoveryTimerRunning = true;
           bleDiscoveryTimer = 5;
           break;
@@ -323,7 +328,11 @@ void SystemTask::Work() {
             // if it's in sleep mode. Avoid bricked device by disabling sleep mode on these versions.
             spiNorFlash.Sleep();
           }
-          spi.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)) {
@@ -457,7 +466,7 @@ void SystemTask::HandleButtonAction(Controllers::ButtonActions action) {
     return;
   }
 
-  displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+  displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
 
   using Actions = Controllers::ButtonActions;