Merge 241e4ef63c 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

@@ -214,6 +214,21 @@ 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;
@@ -286,13 +301,15 @@ 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

@@ -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;
@@ -535,7 +603,8 @@ 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/InfiniTimeTheme.h

@@ -8,6 +8,7 @@ namespace Colors {
   static constexpr lv_color_t green = LV_COLOR_MAKE(0x0, 0xb0, 0x0);
   static constexpr lv_color_t blue = LV_COLOR_MAKE(0x0, 0x50, 0xff);
   static constexpr lv_color_t lightGray = LV_COLOR_MAKE(0xb0, 0xb0, 0xb0);
+  static constexpr lv_color_t gray = LV_COLOR_MAKE(0x50, 0x50, 0x50);
 
   static constexpr lv_color_t bg = LV_COLOR_MAKE(0x5d, 0x69, 0x7e);
   static constexpr lv_color_t bgAlt = LV_COLOR_MAKE(0x38, 0x38, 0x38);

src/displayapp/Messages.h

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

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/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/WatchFaceTerminal.cpp

@@ -2,23 +2,39 @@
 #include "displayapp/screens/WatchFaceTerminal.h"
 #include "displayapp/screens/BatteryIcon.h"
 #include "displayapp/screens/NotificationIcon.h"
-#include "displayapp/screens/Symbols.h"
 #include "components/battery/BatteryController.h"
 #include "components/ble/BleController.h"
 #include "components/ble/NotificationManager.h"
+#include "components/ble/SimpleWeatherService.h"
 #include "components/heartrate/HeartRateController.h"
 #include "components/motion/MotionController.h"
 #include "components/settings/Settings.h"
+#include "displayapp/screens/WeatherSymbols.h"
+#include "displayapp/InfiniTimeTheme.h"
 
 using namespace Pinetime::Applications::Screens;
 
+namespace {
+  lv_color_t temperatureColor(int16_t temperature) {
+    if (temperature <= 0) { // freezing
+      return Colors::blue;
+    } else if (temperature <= 400) { // ice
+      return LV_COLOR_CYAN;
+    } else if (temperature >= 2700) { // hot
+      return Colors::deepOrange;
+    }
+    return Colors::orange; // normal
+  }
+}
+
 WatchFaceTerminal::WatchFaceTerminal(Controllers::DateTime& dateTimeController,
                                      const Controllers::Battery& batteryController,
                                      const Controllers::Ble& bleController,
                                      Controllers::NotificationManager& notificationManager,
                                      Controllers::Settings& settingsController,
                                      Controllers::HeartRateController& heartRateController,
-                                     Controllers::MotionController& motionController)
+                                     Controllers::MotionController& motionController,
+                                     Controllers::SimpleWeatherService& weatherService)
   : currentDateTime {{}},
     dateTimeController {dateTimeController},
     batteryController {batteryController},
@@ -26,41 +42,50 @@ WatchFaceTerminal::WatchFaceTerminal(Controllers::DateTime& dateTimeController,
     notificationManager {notificationManager},
     settingsController {settingsController},
     heartRateController {heartRateController},
-    motionController {motionController} {
-  batteryValue = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(batteryValue, true);
-  lv_obj_align(batteryValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -20);
-
-  connectState = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(connectState, true);
-  lv_obj_align(connectState, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 40);
+    motionController {motionController},
+    weatherService {weatherService} {
 
   notificationIcon = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_align(notificationIcon, nullptr, LV_ALIGN_IN_LEFT_MID, 0, -100);
 
-  label_date = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(label_date, true);
-  lv_obj_align(label_date, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -40);
-
   label_prompt_1 = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_color(label_prompt_1, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
   lv_obj_align(label_prompt_1, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -80);
   lv_label_set_text_static(label_prompt_1, "user@watch:~ $ now");
 
-  label_prompt_2 = lv_label_create(lv_scr_act(), nullptr);
-  lv_obj_align(label_prompt_2, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 60);
-  lv_label_set_text_static(label_prompt_2, "user@watch:~ $");
-
   label_time = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(label_time, true);
   lv_obj_align(label_time, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -60);
 
-  heartbeatValue = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(heartbeatValue, true);
-  lv_obj_align(heartbeatValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 20);
+  label_date = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(label_date, true);
+  lv_obj_align(label_date, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -40);
+
+  weather = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(weather, true);
+  lv_obj_align(weather, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -20);
+
+  batteryValue = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(batteryValue, true);
+  lv_obj_align(batteryValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 0);
 
   stepValue = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(stepValue, true);
-  lv_obj_align(stepValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 0);
+  lv_obj_set_style_local_text_color(stepValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::orange);
+  lv_obj_align(stepValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 20);
+
+  heartbeatValue = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(heartbeatValue, true);
+  lv_obj_align(heartbeatValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 40);
+
+  connectState = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(connectState, true);
+  lv_obj_align(connectState, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 60);
+
+  label_prompt_2 = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_color(label_prompt_2, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+  lv_obj_align(label_prompt_2, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 80);
+  lv_label_set_text_static(label_prompt_2, "user@watch:~ $");
 
   taskRefresh = lv_task_create(RefreshTaskCallback, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
   Refresh();
@@ -72,33 +97,10 @@ WatchFaceTerminal::~WatchFaceTerminal() {
 }
 
 void WatchFaceTerminal::Refresh() {
-  powerPresent = batteryController.IsPowerPresent();
-  batteryPercentRemaining = batteryController.PercentRemaining();
-  if (batteryPercentRemaining.IsUpdated() || powerPresent.IsUpdated()) {
-    lv_label_set_text_fmt(batteryValue, "[BATT]#387b54 %d%%", batteryPercentRemaining.Get());
-    if (batteryController.IsPowerPresent()) {
-      lv_label_ins_text(batteryValue, LV_LABEL_POS_LAST, " Charging");
-    }
-  }
-
-  bleState = bleController.IsConnected();
-  bleRadioEnabled = bleController.IsRadioEnabled();
-  if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
-    if (!bleRadioEnabled.Get()) {
-      lv_label_set_text_static(connectState, "[STAT]#0082fc Disabled#");
-    } else {
-      if (bleState.Get()) {
-        lv_label_set_text_static(connectState, "[STAT]#0082fc Connected#");
-      } else {
-        lv_label_set_text_static(connectState, "[STAT]#0082fc Disconnected#");
-      }
-    }
-  }
-
   notificationState = notificationManager.AreNewNotificationsAvailable();
   if (notificationState.IsUpdated()) {
     if (notificationState.Get()) {
-      lv_label_set_text_static(notificationIcon, "You have mail.");
+      lv_label_set_text_static(notificationIcon, "[1]+ Notify");
     } else {
       lv_label_set_text_static(notificationIcon, "");
     }
@@ -120,9 +122,9 @@ void WatchFaceTerminal::Refresh() {
         hour = hour - 12;
         ampmChar[0] = 'P';
       }
-      lv_label_set_text_fmt(label_time, "[TIME]#11cc55 %02d:%02d:%02d %s#", hour, minute, second, ampmChar);
+      lv_label_set_text_fmt(label_time, "#fffff [TIME]# #11cc55 %02d:%02d:%02d %s#", hour, minute, second, ampmChar);
     } else {
-      lv_label_set_text_fmt(label_time, "[TIME]#11cc55 %02d:%02d:%02d", hour, minute, second);
+      lv_label_set_text_fmt(label_time, "#ffffff [TIME]# #11cc55 %02d:%02d:%02d#", hour, minute, second);
     }
 
     currentDate = std::chrono::time_point_cast<std::chrono::days>(currentDateTime.Get());
@@ -130,22 +132,75 @@ void WatchFaceTerminal::Refresh() {
       uint16_t year = dateTimeController.Year();
       Controllers::DateTime::Months month = dateTimeController.Month();
       uint8_t day = dateTimeController.Day();
-      lv_label_set_text_fmt(label_date, "[DATE]#007fff %04d-%02d-%02d#", short(year), char(month), char(day));
+      lv_label_set_text_fmt(label_date, "#ffffff [DATE]# #007fff %04d-%02d-%02d#", short(year), char(month), char(day));
     }
   }
 
+  currentWeather = weatherService.Current();
+  if (currentWeather.IsUpdated()) {
+    auto optCurrentWeather = currentWeather.Get();
+    if (optCurrentWeather) {
+      int16_t temp = optCurrentWeather->temperature;
+      char tempUnit = 'C';
+      lv_obj_set_style_local_text_color(weather, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, temperatureColor(temp));
+      if (settingsController.GetWeatherFormat() == Controllers::Settings::WeatherFormat::Imperial) {
+        temp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(temp);
+        tempUnit = 'F';
+      }
+      lv_label_set_text_fmt(weather, "#ffffff [WTHR]# %i°%c %s ", temp / 100, tempUnit, Symbols::GetSimpleCondition(optCurrentWeather->iconId));
+    } else {
+      lv_label_set_text(weather, "#ffffff [WTHR]# ---");
+      lv_obj_set_style_local_text_color(weather, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
+    }
+  }
+
+  powerPresent = batteryController.IsPowerPresent();
+  batteryPercentRemaining = batteryController.PercentRemaining();
+  if (batteryPercentRemaining.IsUpdated() || powerPresent.IsUpdated()) {
+    // HSV color model has red at 0° and green at 120°.
+    // We lock satuation and brightness at 100% and traverse the cilinder
+    // between red and green, thus avoiding the darker RGB on medium battery
+    // charges and giving us a much nicer color range.
+    uint8_t hue = batteryPercentRemaining.Get() * 120 / 100;
+    lv_obj_set_style_local_text_color(batteryValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hsv_to_rgb(hue, 100, 100));
+    lv_label_set_text_fmt(batteryValue, "#ffffff [BATT]# %d%%", batteryPercentRemaining.Get());
+    if (batteryController.IsCharging()) {
+      lv_label_ins_text(batteryValue, LV_LABEL_POS_LAST, " Charging");
+    }
+  }
+
+  stepCount = motionController.NbSteps();
+  if (stepCount.IsUpdated()) {
+    lv_label_set_text_fmt(stepValue, "#ffffff [STEP]# %lu steps", stepCount.Get());
+  }
+
   heartbeat = heartRateController.HeartRate();
   heartbeatRunning = heartRateController.State() != Controllers::HeartRateController::States::Stopped;
   if (heartbeat.IsUpdated() || heartbeatRunning.IsUpdated()) {
     if (heartbeatRunning.Get()) {
-      lv_label_set_text_fmt(heartbeatValue, "[L_HR]#ee3311 %d bpm#", heartbeat.Get());
+
+      lv_obj_set_style_local_text_color(heartbeatValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::deepOrange);
+      lv_label_set_text_fmt(heartbeatValue, "#ffffff [L_HR]# %d bpm", heartbeat.Get());
     } else {
-      lv_label_set_text_static(heartbeatValue, "[L_HR]#ee3311 ---#");
+      lv_label_set_text_static(heartbeatValue, "#ffffff [L_HR]# ---");
+      lv_obj_set_style_local_text_color(heartbeatValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
     }
   }
 
-  stepCount = motionController.NbSteps();
-  if (stepCount.IsUpdated()) {
-    lv_label_set_text_fmt(stepValue, "[STEP]#ee3377 %lu steps#", stepCount.Get());
+  bleState = bleController.IsConnected();
+  bleRadioEnabled = bleController.IsRadioEnabled();
+  if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
+    if (!bleRadioEnabled.Get()) {
+      lv_label_set_text_static(connectState, "#ffffff [STAT]# Disabled");
+      lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
+    } else {
+      if (bleState.Get()) {
+        lv_label_set_text_static(connectState, "#ffffff [STAT]# Connected");
+        lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::blue);
+      } else {
+        lv_label_set_text_static(connectState, "#ffffff [STAT]# Disconnected");
+        lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
+      }
+    }
   }
 }

src/displayapp/screens/WatchFaceTerminal.h

@@ -7,6 +7,7 @@
 #include <displayapp/Controllers.h>
 #include "displayapp/screens/Screen.h"
 #include "components/datetime/DateTimeController.h"
+#include "components/ble/SimpleWeatherService.h"
 #include "utility/DirtyValue.h"
 
 namespace Pinetime {
@@ -30,7 +31,8 @@ namespace Pinetime {
                           Controllers::NotificationManager& notificationManager,
                           Controllers::Settings& settingsController,
                           Controllers::HeartRateController& heartRateController,
-                          Controllers::MotionController& motionController);
+                          Controllers::MotionController& motionController,
+                          Controllers::SimpleWeatherService& weatherService);
         ~WatchFaceTerminal() override;
 
         void Refresh() override;
@@ -46,16 +48,18 @@ namespace Pinetime {
         Utility::DirtyValue<bool> heartbeatRunning {};
         Utility::DirtyValue<bool> notificationState {};
         Utility::DirtyValue<std::chrono::time_point<std::chrono::system_clock, std::chrono::days>> currentDate;
+        Utility::DirtyValue<std::optional<Controllers::SimpleWeatherService::CurrentWeather>> currentWeather {};
 
+        lv_obj_t* notificationIcon;
+        lv_obj_t* label_prompt_1;
         lv_obj_t* label_time;
         lv_obj_t* label_date;
-        lv_obj_t* label_prompt_1;
-        lv_obj_t* label_prompt_2;
+        lv_obj_t* weather;
         lv_obj_t* batteryValue;
-        lv_obj_t* heartbeatValue;
         lv_obj_t* stepValue;
-        lv_obj_t* notificationIcon;
+        lv_obj_t* heartbeatValue;
         lv_obj_t* connectState;
+        lv_obj_t* label_prompt_2;
 
         Controllers::DateTime& dateTimeController;
         const Controllers::Battery& batteryController;
@@ -64,6 +68,7 @@ namespace Pinetime {
         Controllers::Settings& settingsController;
         Controllers::HeartRateController& heartRateController;
         Controllers::MotionController& motionController;
+        Controllers::SimpleWeatherService& weatherService;
 
         lv_task_t* taskRefresh;
       };
@@ -81,7 +86,8 @@ namespace Pinetime {
                                               controllers.notificationManager,
                                               controllers.settingsController,
                                               controllers.heartRateController,
-                                              controllers.motionController);
+                                              controllers.motionController,
+                                              *controllers.weatherController);
       };
 
       static bool IsAvailable(Pinetime::Controllers::FS& /*filesystem*/) {

src/displayapp/screens/WeatherSymbols.cpp

@@ -59,3 +59,28 @@ const char* Pinetime::Applications::Screens::Symbols::GetCondition(const Pinetim
       return "";
   }
 }
+
+const char* Pinetime::Applications::Screens::Symbols::GetSimpleCondition(const Pinetime::Controllers::SimpleWeatherService::Icons icon) {
+  switch (icon) {
+    case Pinetime::Controllers::SimpleWeatherService::Icons::Sun:
+      return "Clear";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::CloudsSun:
+      return "Clouds";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::Clouds:
+      return "Clouds";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::BrokenClouds:
+      return "Clouds";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::CloudShowerHeavy:
+      return "Rain";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::CloudSunRain:
+      return "Drizzle";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::Thunderstorm:
+      return "Thunder";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::Snow:
+      return "Snow";
+    case Pinetime::Controllers::SimpleWeatherService::Icons::Smog:
+      return "Mist";
+    default:
+      return "";
+  }
+}

src/displayapp/screens/WeatherSymbols.h

@@ -8,6 +8,7 @@ namespace Pinetime {
       namespace Symbols {
         const char* GetSymbol(const Pinetime::Controllers::SimpleWeatherService::Icons icon);
         const char* GetCondition(const Pinetime::Controllers::SimpleWeatherService::Icons icon);
+        const char* GetSimpleCondition(const Pinetime::Controllers::SimpleWeatherService::Icons icon);
       }
     }
   }

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/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;