Bump version

This PR introduces a Nix flake, allowing for InfiniTime to be built as a
Flake, including a FHS development environment.

It's derived from #1850 and
c57c57f3c6.

We also introduce `flake-compat`, allowing for non-Flake Nix mahcines to
use the project as-is, both for building (`default.nix`), and
development (`shell.nix`).

Additionally, we introduce `.envrc`, meaning that with `direnv`, the Nix
Flake is activated automatically.

Fixes #1850.

Signed-off-by: Dom Rodriguez <shymega@shymega.org.uk>

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/main.yml

@@ -56,6 +56,11 @@ jobs:
         with:
           name: InfiniTime MCUBoot image ${{ github.head_ref }}
           path: ./build/output/pinetime-mcuboot-app-image-*.bin
+      - name: Upload standalone ELF artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: InfiniTime image ${{ github.head_ref }}
+          path: ./build/output/src/pinetime-app-*.out
       - name: Upload resources artifacts
         uses: actions/upload-artifact@v3
         with:

.gitmodules

@@ -4,9 +4,6 @@
 [submodule "src/libs/littlefs"]
 	path = src/libs/littlefs
 	url = https://github.com/littlefs-project/littlefs.git
-[submodule "src/libs/QCBOR"]
-	path = src/libs/QCBOR
-	url = https://github.com/laurencelundblade/QCBOR.git
 [submodule "src/libs/arduinoFFT"]
 	path = src/libs/arduinoFFT
 	url = https://github.com/kosme/arduinoFFT.git

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.10)
 
 set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose Debug or Release")
 
-project(pinetime VERSION 1.14.0 LANGUAGES C CXX ASM)
+project(pinetime VERSION 1.15.3 LANGUAGES C CXX ASM)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_CXX_STANDARD 20)

README.md

@@ -9,6 +9,8 @@ Fast open-source firmware for the [PineTime smartwatch](https://pine64.org/devic
 - [Getting started with InfiniTime](doc/gettingStarted/gettingStarted-1.0.md)
 - [Updating the software](doc/gettingStarted/updating-software.md)
 - [About the firmware and bootloader](doc/gettingStarted/about-software.md)
+- [Available apps](doc/gettingStarted/Applications.md)
+- [Available watch faces](/doc/gettingStarted/Watchfaces.md)
 - [PineTimeStyle Watch face](https://pine64.org/documentation/PineTime/Watchfaces/PineTimeStyle)
   - [Weather integration](https://pine64.org/documentation/PineTime/Software/InfiniTime_weather/)
 
@@ -35,7 +37,7 @@ Fast open-source firmware for the [PineTime smartwatch](https://pine64.org/devic
 
 ### Contributing
 
-- [How to contribute?](CONTRIBUTING.md)
+- [How to contribute](CONTRIBUTING.md)
 - [Coding conventions](doc/coding-convention.md)
 
 ### Build, flash and debug

default.nix

@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
+    fetchTarball {
+      url = lock.nodes.flake-compat.locked.url or "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).defaultNix

doc/gettingStarted/Applications.md

@@ -0,0 +1,99 @@
+# Applications
+
+InfiniTime has 13 apps on the `main` branch at the time of writing.
+
+## List of apps
+- Stopwatch
+- Alarm
+- Timer
+- Steps
+- Heartrate
+- Music
+- InfiniPaint
+- Paddle
+- 2
+- InfiniDice
+- Metronome
+- Maps
+- Weather
+
+### Stopwatch
+![Stopwatch UI](/doc/gettingStarted/AppsScreenshots/stopwatch.png)
+- Press the Start button (bottom right) to start or stop the timer.
+   - You can also press the side button while the timer is running to pause the timer.
+- Press the Flag button (bottom left) to add a lap.
+- The stopwatch will not yet continue counting time while the app is closed.
+
+### Alarm
+![Alarm UI](/doc/gettingStarted/AppsScreenshots/alarm.png)
+- Ajust the time with the time picker.
+- Press the Info button in the top middle to see time remaning.
+- Use the toggle in the bottom left to turn the alarm on/off.
+- Use the button in the bottom right to change the alarm frequency.
+   - You can choose between once, daily, or Monday - Friday.
+
+### Timer
+![Timer UI](/doc/gettingStarted/AppsScreenshots/timer.png)
+- Ajust how long the timer should go for with the time picker.
+- Press the Start button at the bottom to start/stop the timer.
+
+### Steps
+![Steps UI](/doc/gettingStarted/AppsScreenshots/steps.png)
+- The total count of steps for the current display will show in the middle of the screen.
+- The Reset button in the bottom middle resets the Trip counter. (Total of all steps taken.)
+- The progress circle shows the percentage of your daily goal completed.
+
+### Heartrate
+![Heartrate UI](/doc/gettingStarted/AppsScreenshots/Heartrate.png)
+- Press Start to start measuring your heartrate.
+    - It may take a bit to get the first measurement.
+
+### Music
+![Music UI](/doc/gettingStarted/AppsScreenshots/Music.png)
+- This app shows currently playing music.
+    - Please note that this app is not very useful without a device connected.
+- Press the button in the center to play/pause, and the buttons on the left and right to go to the previous and next tracks, respectively.
+- Swipe up to get to volume controls.
+
+### InfiniPaint
+![InfiniPaint UI](/doc/gettingStarted/AppsScreenshots/Paint.png)
+- This app does not allow you to swipe from the top to exit, use the side button instead.
+- Draw on the screen to add lines.
+- Hold down in one spot to change paint colors.
+
+### Paddle
+![Paddle UI](/doc/gettingStarted/AppsScreenshots/Pong.png)
+- This app does not allow you to swipe from the top to exit, use the side button instead.
+- Drag your finger to move the paddle.
+- Goal: Don't let the ball go off the left side of the screen.
+
+### 2
+![2 UI](/doc/gettingStarted/AppsScreenshots/2048.png)
+- This app does not allow you to swipe from the top to exit, use the side button instead.
+- Play a game of 2048.
+- Swipe up, down, left, or right tomove the tiles.
+- When two tiles with the same number run into each other, they will add together.
+- Goal: Don't let the screen fill up with tiles, and get to the 2048 tile to win.
+
+### InfiniDice
+![InfiniDice UI](/doc/gettingStarted/AppsScreenshots/Dice.png)
+- Ajust the count to change the number of dice.
+- Ajust the sides to change the number of sides.
+- Press the button at the bottom to roll.
+- The result will be on the right side of the screen.
+
+### Metronome
+![Metronome UI](/doc/gettingStarted/AppsScreenshots/Metronome.png)
+- Ajust the BPM with the circular slider.
+    - A bug currently makes it always snap to 98 BPM.
+- Use the button in the bottom left to start the metronome.
+
+### Maps
+![Maps UI](/doc/gettingStarted/AppsScreenshots/Maps.png)
+- This app shows info from a navigation app.
+    - Please note that this app is not very useful without a device connected.
+
+### Weather
+![Weather UI](/doc/gettingStarted/AppsScreenshots/Weather.png)
+- This app shows weather info.
+    - Please note that this app is not very useful without a device connected.

doc/gettingStarted/Watchfaces.md

@@ -0,0 +1,31 @@
+# Watchfaces
+
+InfiniTime has 6 apps on the `main` branch at the time of writing.
+
+## List of apps
+- Digital
+- Analog
+- PineTimeStyle
+- Terminal
+- Infinineat
+- Casio G7710
+
+### Digital
+![Digital face](/doc/gettingStarted/Watchfaces/Digital.png)
+
+### Analog
+![Analog face](/doc/gettingStarted/Watchfaces/Analog.png)
+
+### PineTimeStyle
+![PineTimeStyle face](/doc/gettingStarted/Watchfaces/PineTimeStyle.png)
+    - You can long-press on the display to change colors, step style, and weather.
+
+### Terminal
+![Terminal face](/doc/gettingStarted/Watchfaces/Terminal.png)
+
+### Infinineat
+![Infinineat face](/doc/gettingStarted/Watchfaces/Infinineat.png)
+    - You can long-press on the display to change colors.
+
+### Casio G7710
+![Casio G7710 face](/doc/gettingStarted/Watchfaces/CasioG7710.png)

doc/gettingStarted/gettingStarted-1.0.md

@@ -14,7 +14,7 @@ You can sync the time using companion apps.
 
 - Gadgetbridge automatically synchronizes the time when you connect it to your watch. More information on Gadgetbridge [here](/doc/gettingStarted/ota-gadgetbridge.md)
 - [Sync the time with NRFConnect](/doc/gettingStarted/time-nrfconnect.md)
-- Sync the time with your browser https://hubmartin.github.io/WebBLEWatch/
+- [Sync the time with your browser](https://hubmartin.github.io/WebBLEWatch/)
 
 You can also set the time in the settings without a companion app. (version >1.7.0)
 
@@ -46,7 +46,7 @@ On the bottom right, you can see how many steps you have taken today.
 ![Settings](ui/settings.jpg)
 
 - Swipe **up** to display the application menus. Apps (stopwatch, music, step, games,...) can be started from this menu.
-- Swipe **down** to display the notification panel. Notification sent by your companion app will be displayed here.
+- Swipe **down** to display the notification panel. Notifications sent by your companion app will be displayed here.
 - Swipe **right** to display the Quick Actions menu. This menu allows you to
   - Set the brightness of the display
   - Start the **flashlight** app

doc/gettingStarted/ota-gadgetbridge.md

@@ -1,29 +1,35 @@
 # Connecting to Gadgetbridge
 
-Launch Gadgetbridge and tap on the **"+"** button on the bottom right to add a new device:
+Launch Gadgetbridge and tap on the menu button in the top left:
 
 ![Gadgetbridge 0](gadgetbridge0.jpg)
 
-Wait for the scan to complete, your PineTime should be detected:
+Press the "Connect new device" button:
 
 ![Gadgetbridge 1](gadgetbridge1.jpg)
 
+Your PineTime should appear on the list. Tap on it.
+
 Tap on it. Gadgdetbridge will pair and connect to your device:
 
 ![Gadgetbridge 2](gadgetbridge2.jpg)
 
 # Updating with Gadgetbridge
 
-Now that Gadgetbridge is connected to your PineTime, use a file browser application and find the DFU file (`pinetime-mcuboot-app-dfu-x.x.x.zip`) you downloaded previously. Tap on it and open it using the Gadgetbridge application/firmware installer:
+Now that Gadgetbridge is connected to your PineTime, press the three dots on the device card:
 
 ![Gadgetbridge 3](gadgetbridge3.jpg)
 
-Read the warning carefully and tap **Install**:
+Now press the "File Installer" button:
 
 ![Gadgetbridge 4](gadgetbridge4.jpg)
 
-Wait for the transfer to finish. Your PineTime should reset and reboot with the new version of InfiniTime!
-
-Don't forget to **validate** your firmware. In the InfiniTime go to the settings (swipe right, select gear icon) and Firmware option and click **validate**. Otherwise after reboot the previous firmware will be used.
+Select the firmware you downloaded (`pinetime-mcuboot-app-dfu-x.x.x.zip`) from the [Releases tab](https://github.com/InfiniTimeOrg/InfiniTime/releases/latest):
 
 ![Gadgetbridge 5](gadgetbridge5.jpg)
+
+Wait for the transfer to finish. There will be a progress bar on both the watch and the phone. Your PineTime should reboot with the new version of InfiniTime!
+
+Don't forget to **validate** your firmware. In the InfiniTime go to the settings (swipe right, select gear icon) and scroll to the Firmware option and click **validate**. Otherwise, after reboot the previous firmware will be used.
+
+![Validate](validate.png)

doc/gettingStarted/updating-software.md

@@ -6,7 +6,7 @@ If you just want to flash or upgrade InfiniTime on your PineTime, this page is f
 
 You can check the InfiniTime version by first swiping right on the watch face to open quick settings, tapping the cogwheel to open settings, swipe up until you find an entry named "About" and tap on it.
 
-![InfiniTime 1.0 version](version-1.0.jpg)
+![InfiniTime 1.14 version](version.png)
 
 PineTimes shipped after June 2021 will ship with the latest version of [the bootloader](https://github.com/JF002/pinetime-mcuboot-bootloader/releases/tag/1.0.0) and [recovery firmware](https://github.com/InfiniTimeOrg/InfiniTime/releases/tag/0.14.1)
 
@@ -49,7 +49,7 @@ Since those resources are not part of the firmware, they need to be flashed and
 Resources are packaged into a single .zip file named `infinitime-resources-x.y.z.zip` (where `x`, `y` and `z` are the version numbers of InfiniTime). 
 You can use the companion app of your choice to flash the resources.
 
-**Note : at the time of writing this page, [Amazfish](https://github.com/piggz/harbour-amazfish) and [ITD](https://gitea.arsenm.dev/Arsen6331/itd) have already integrated this functionality. Other companion apps will hopefully implement it soon!*
+**Note: at the time of writing this page, [Amazfish](https://github.com/piggz/harbour-amazfish) and [ITD](https://gitea.arsenm.dev/Arsen6331/itd) have already integrated this functionality. Other companion apps will hopefully implement it soon!*
 
 ## Amazfish
 Use the `Download file` functionality of Amazfish. 

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "revCount": 57,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/edolstra/flake-compat/1.0.1/018afb31-abd1-7bff-a5e4-cff7e18efb7a/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1728492678,
+        "narHash": "sha256-9UTxR8eukdg+XZeHgxW5hQA9fIKHsKCdOIUycTryeVw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5633bcff0c6162b9e4b5f1264264611e950c8ec7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,102 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
+  };
+
+  outputs = { self, ... }@inputs:
+    let
+      forAllSystems = function:
+        inputs.nixpkgs.lib.genAttrs [
+          "x86_64-linux"
+          "aarch64-linux"
+        ]
+          (system: function (import inputs.nixpkgs {
+            inherit system;
+            config.allowUnfree = true;
+          }));
+    in
+    {
+      packages = forAllSystems (pkgs:
+        let
+          infinitime-nrf5-sdk = pkgs.nrf5-sdk.overrideAttrs (old: {
+            version = "15.3.0";
+            src = pkgs.fetchzip {
+              url = "https://nsscprodmedia.blob.core.windows.net/prod/software-and-other-downloads/sdks/nrf5/binaries/nrf5sdk153059ac345.zip";
+              sha256 = "sha256-pfmhbpgVv5x2ju489XcivguwpnofHbgVA7bFUJRTj08=";
+            };
+          });
+        in
+        with pkgs; {
+          default = stdenv.mkDerivation rec {
+            name = "infinitime";
+            version = "1.14.1";
+
+            src = fetchFromGitHub {
+              owner = "InfiniTimeOrg";
+              repo = "InfiniTime";
+              rev = "refs/tags/${version}";
+              hash = "sha256-IrsN+9LgEjgfoRR6H7FhsdLMK+GLxc41IBnSbdpwv/E=";
+              fetchSubmodules = true;
+            };
+
+            nativeBuildInputs = [
+              adafruit-nrfutil
+              nodePackages.lv_font_conv
+              patch
+              python3
+              python3.pkgs.cbor
+              python3.pkgs.click
+              python3.pkgs.cryptography
+              python3.pkgs.intelhex
+              python3.pkgs.pillow
+            ];
+
+            postPatch = ''
+              # /usr/bin/env is not available in the build sandbox
+              substituteInPlace src/displayapp/fonts/generate.py --replace "'/usr/bin/env', 'patch'" "'patch'"
+              substituteInPlace tools/mcuboot/imgtool.py --replace "/usr/bin/env python3" "${python3}/bin/python3"
+            '';
+
+            cmakeFlags = [
+              ''-DARM_NONE_EABI_TOOLCHAIN_PATH=${gcc-arm-embedded-10}''
+              ''-DNRF5_SDK_PATH=${infinitime-nrf5-sdk}/share/nRF5_SDK''
+              ''-DBUILD_DFU=1''
+              ''-DBUILD_RESOURCES=1''
+              ''-DCMAKE_SOURCE_DIR=${src}''
+            ];
+
+            installPhase = ''
+              SOURCES_DIR=${src} BUILD_DIR=. OUTPUT_DIR=$out ./post_build.sh
+            '';
+          };
+        });
+
+      devShells = forAllSystems (pkgs:
+        let
+          infinitime-nrf5-sdk = pkgs.nrf5-sdk.overrideAttrs (old: {
+            version = "15.3.0";
+            src = pkgs.fetchzip {
+              url = "https://nsscprodmedia.blob.core.windows.net/prod/software-and-other-downloads/sdks/nrf5/binaries/nrf5sdk153059ac345.zip";
+              sha256 = "sha256-pfmhbpgVv5x2ju489XcivguwpnofHbgVA7bFUJRTj08=";
+            };
+          });
+        in
+        with pkgs; {
+          default =
+            mkShell {
+              packages = [
+                (writeShellScriptBin "cmake_infinitime" ''
+                  ${cmake}/bin/cmake -DARM_NONE_EABI_TOOLCHAIN_PATH="${gcc-arm-embedded-10}" \
+                        -DNRF5_SDK_PATH="${infinitime-nrf5-sdk}/share/nRF5_SDK" \
+                        "$@"
+                '')
+                ninja
+              ] ++ self.packages.${pkgs.system}.default.nativeBuildInputs;
+            };
+        });
+    };
+}
+      

shell.nix

@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
+    fetchTarball {
+      url = lock.nodes.flake-compat.locked.url or "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).shellNix

src/CMakeLists.txt

@@ -479,6 +479,7 @@ list(APPEND SOURCE_FILES
 
         systemtask/SystemTask.cpp
         systemtask/SystemMonitor.cpp
+        systemtask/WakeLock.cpp
         drivers/TwiMaster.cpp
 
         heartratetask/HeartRateTask.cpp
@@ -543,6 +544,7 @@ list(APPEND RECOVERY_SOURCE_FILES
 
         systemtask/SystemTask.cpp
         systemtask/SystemMonitor.cpp
+        systemtask/WakeLock.cpp
         drivers/TwiMaster.cpp
         components/rle/RleDecoder.cpp
         components/heartrate/HeartRateController.cpp
@@ -661,6 +663,7 @@ set(INCLUDE_FILES
         displayapp/InfiniTimeTheme.h
         systemtask/SystemTask.h
         systemtask/SystemMonitor.h
+        systemtask/WakeLock.h
         displayapp/screens/Symbols.h
         drivers/TwiMaster.h
         heartratetask/HeartRateTask.h
@@ -861,7 +864,6 @@ target_compile_options(nrf-sdk PRIVATE
         $<$<CONFIG:RELEASE>: ${RELEASE_FLAGS}>
         $<$<COMPILE_LANGUAGE:CXX>: ${CXX_FLAGS}>
         $<$<COMPILE_LANGUAGE:ASM>: ${ASM_FLAGS}>
-        -O3
         )
 
 # NimBLE

src/components/alarm/AlarmController.cpp

@@ -19,11 +19,13 @@
 #include "systemtask/SystemTask.h"
 #include "task.h"
 #include <chrono>
+#include <libraries/log/nrf_log.h>
 
 using namespace Pinetime::Controllers;
 using namespace std::chrono_literals;
 
-AlarmController::AlarmController(Controllers::DateTime& dateTimeController) : dateTimeController {dateTimeController} {
+AlarmController::AlarmController(Controllers::DateTime& dateTimeController, Controllers::FS& fs)
+  : dateTimeController {dateTimeController}, fs {fs} {
 }
 
 namespace {
@@ -36,11 +38,28 @@ namespace {
 void AlarmController::Init(System::SystemTask* systemTask) {
   this->systemTask = systemTask;
   alarmTimer = xTimerCreate("Alarm", 1, pdFALSE, this, SetOffAlarm);
+  LoadSettingsFromFile();
+  if (alarm.isEnabled) {
+    NRF_LOG_INFO("[AlarmController] Loaded alarm was enabled, scheduling");
+    ScheduleAlarm();
+  }
+}
+
+void AlarmController::SaveAlarm() {
+  // verify if it is necessary to save
+  if (alarmChanged) {
+    SaveSettingsToFile();
+  }
+  alarmChanged = false;
 }
 
 void AlarmController::SetAlarmTime(uint8_t alarmHr, uint8_t alarmMin) {
-  hours = alarmHr;
-  minutes = alarmMin;
+  if (alarm.hours == alarmHr && alarm.minutes == alarmMin) {
+    return;
+  }
+  alarm.hours = alarmHr;
+  alarm.minutes = alarmMin;
+  alarmChanged = true;
 }
 
 void AlarmController::ScheduleAlarm() {
@@ -53,18 +72,19 @@ void AlarmController::ScheduleAlarm() {
   tm* tmAlarmTime = std::localtime(&ttAlarmTime);
 
   // If the time being set has already passed today,the alarm should be set for tomorrow
-  if (hours < dateTimeController.Hours() || (hours == dateTimeController.Hours() && minutes <= dateTimeController.Minutes())) {
+  if (alarm.hours < dateTimeController.Hours() ||
+      (alarm.hours == dateTimeController.Hours() && alarm.minutes <= dateTimeController.Minutes())) {
     tmAlarmTime->tm_mday += 1;
     // tm_wday doesn't update automatically
     tmAlarmTime->tm_wday = (tmAlarmTime->tm_wday + 1) % 7;
   }
 
-  tmAlarmTime->tm_hour = hours;
-  tmAlarmTime->tm_min = minutes;
+  tmAlarmTime->tm_hour = alarm.hours;
+  tmAlarmTime->tm_min = alarm.minutes;
   tmAlarmTime->tm_sec = 0;
 
   // if alarm is in weekday-only mode, make sure it shifts to the next weekday
-  if (recurrence == RecurType::Weekdays) {
+  if (alarm.recurrence == RecurType::Weekdays) {
     if (tmAlarmTime->tm_wday == 0) { // Sunday, shift 1 day
       tmAlarmTime->tm_mday += 1;
     } else if (tmAlarmTime->tm_wday == 6) { // Saturday, shift 2 days
@@ -79,7 +99,10 @@ void AlarmController::ScheduleAlarm() {
   xTimerChangePeriod(alarmTimer, secondsToAlarm * configTICK_RATE_HZ, 0);
   xTimerStart(alarmTimer, 0);
 
-  state = AlarmState::Set;
+  if (!alarm.isEnabled) {
+    alarm.isEnabled = true;
+    alarmChanged = true;
+  }
 }
 
 uint32_t AlarmController::SecondsToAlarm() const {
@@ -88,20 +111,72 @@ uint32_t AlarmController::SecondsToAlarm() const {
 
 void AlarmController::DisableAlarm() {
   xTimerStop(alarmTimer, 0);
-  state = AlarmState::Not_Set;
+  isAlerting = false;
+  if (alarm.isEnabled) {
+    alarm.isEnabled = false;
+    alarmChanged = true;
+  }
 }
 
 void AlarmController::SetOffAlarmNow() {
-  state = AlarmState::Alerting;
+  isAlerting = true;
   systemTask->PushMessage(System::Messages::SetOffAlarm);
 }
 
 void AlarmController::StopAlerting() {
-  // Alarm state is off unless this is a recurring alarm
-  if (recurrence == RecurType::None) {
-    state = AlarmState::Not_Set;
+  isAlerting = false;
+  // Disable alarm unless it is recurring
+  if (alarm.recurrence == RecurType::None) {
+    alarm.isEnabled = false;
+    alarmChanged = true;
   } else {
     // set next instance
     ScheduleAlarm();
   }
 }
+
+void AlarmController::SetRecurrence(RecurType recurrence) {
+  if (alarm.recurrence != recurrence) {
+    alarm.recurrence = recurrence;
+    alarmChanged = true;
+  }
+}
+
+void AlarmController::LoadSettingsFromFile() {
+  lfs_file_t alarmFile;
+  AlarmSettings alarmBuffer;
+
+  if (fs.FileOpen(&alarmFile, "/.system/alarm.dat", LFS_O_RDONLY) != LFS_ERR_OK) {
+    NRF_LOG_WARNING("[AlarmController] Failed to open alarm data file");
+    return;
+  }
+
+  fs.FileRead(&alarmFile, reinterpret_cast<uint8_t*>(&alarmBuffer), sizeof(alarmBuffer));
+  fs.FileClose(&alarmFile);
+  if (alarmBuffer.version != alarmFormatVersion) {
+    NRF_LOG_WARNING("[AlarmController] Loaded alarm settings has version %u instead of %u, discarding",
+                    alarmBuffer.version,
+                    alarmFormatVersion);
+    return;
+  }
+
+  alarm = alarmBuffer;
+  NRF_LOG_INFO("[AlarmController] Loaded alarm settings from file");
+}
+
+void AlarmController::SaveSettingsToFile() const {
+  lfs_dir systemDir;
+  if (fs.DirOpen("/.system", &systemDir) != LFS_ERR_OK) {
+    fs.DirCreate("/.system");
+  }
+  fs.DirClose(&systemDir);
+  lfs_file_t alarmFile;
+  if (fs.FileOpen(&alarmFile, "/.system/alarm.dat", LFS_O_WRONLY | LFS_O_CREAT) != LFS_ERR_OK) {
+    NRF_LOG_WARNING("[AlarmController] Failed to open alarm data file for saving");
+    return;
+  }
+
+  fs.FileWrite(&alarmFile, reinterpret_cast<const uint8_t*>(&alarm), sizeof(alarm));
+  fs.FileClose(&alarmFile);
+  NRF_LOG_INFO("[AlarmController] Saved alarm settings with format version %u to file", alarm.version);
+}

src/components/alarm/AlarmController.h

@@ -30,47 +30,65 @@ namespace Pinetime {
   namespace Controllers {
     class AlarmController {
     public:
-      AlarmController(Controllers::DateTime& dateTimeController);
+      AlarmController(Controllers::DateTime& dateTimeController, Controllers::FS& fs);
 
       void Init(System::SystemTask* systemTask);
+      void SaveAlarm();
       void SetAlarmTime(uint8_t alarmHr, uint8_t alarmMin);
       void ScheduleAlarm();
       void DisableAlarm();
       void SetOffAlarmNow();
       uint32_t SecondsToAlarm() const;
       void StopAlerting();
-      enum class AlarmState { Not_Set, Set, Alerting };
       enum class RecurType { None, Daily, Weekdays };
 
       uint8_t Hours() const {
-        return hours;
+        return alarm.hours;
       }
 
       uint8_t Minutes() const {
-        return minutes;
+        return alarm.minutes;
       }
 
-      AlarmState State() const {
-        return state;
+      bool IsAlerting() const {
+        return isAlerting;
+      }
+
+      bool IsEnabled() const {
+        return alarm.isEnabled;
       }
 
       RecurType Recurrence() const {
-        return recurrence;
+        return alarm.recurrence;
       }
 
-      void SetRecurrence(RecurType recurType) {
-        recurrence = recurType;
-      }
+      void SetRecurrence(RecurType recurrence);
 
     private:
+      // Versions 255 is reserved for now, so the version field can be made
+      // bigger, should it ever be needed.
+      static constexpr uint8_t alarmFormatVersion = 1;
+
+      struct AlarmSettings {
+        uint8_t version = alarmFormatVersion;
+        uint8_t hours = 7;
+        uint8_t minutes = 0;
+        RecurType recurrence = RecurType::None;
+        bool isEnabled = false;
+      };
+
+      bool isAlerting = false;
+      bool alarmChanged = false;
+
       Controllers::DateTime& dateTimeController;
+      Controllers::FS& fs;
       System::SystemTask* systemTask = nullptr;
       TimerHandle_t alarmTimer;
-      uint8_t hours = 7;
-      uint8_t minutes = 0;
+      AlarmSettings alarm;
       std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> alarmTime;
-      AlarmState state = AlarmState::Not_Set;
-      RecurType recurrence = RecurType::None;
+
+      void LoadSettingsFromFile();
+      void SaveSettingsToFile() const;
     };
   }
 }

src/components/ble/DfuService.cpp

@@ -124,9 +124,11 @@ int DfuService::WritePacketHandler(uint16_t connectionHandle, os_mbuf* om) {
                    bootloaderSize,
                    applicationSize);
 
-      // wait until SystemTask has finished waking up all devices
-      while (systemTask.IsSleeping()) {
-        vTaskDelay(50); // 50ms
+      // Wait until SystemTask has disabled sleeping
+      // This isn't quite correct, as we don't actually know
+      // if BleFirmwareUpdateStarted has been received yet
+      while (!systemTask.IsSleepDisabled()) {
+        vTaskDelay(pdMS_TO_TICKS(5));
       }
 
       dfuImage.Erase();

src/components/ble/DfuService.h

@@ -77,6 +77,10 @@ namespace Pinetime {
         uint16_t ComputeCrc(uint8_t const* p_data, uint32_t size, uint16_t const* p_crc);
       };
 
+      static constexpr ble_uuid128_t serviceUuid {
+        .u {.type = BLE_UUID_TYPE_128},
+        .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x30, 0x15, 0x00, 0x00}};
+
     private:
       Pinetime::System::SystemTask& systemTask;
       Pinetime::Controllers::Ble& bleController;
@@ -90,10 +94,6 @@ namespace Pinetime {
 
       uint16_t revision {0x0008};
 
-      static constexpr ble_uuid128_t serviceUuid {
-        .u {.type = BLE_UUID_TYPE_128},
-        .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x30, 0x15, 0x00, 0x00}};
-
       static constexpr ble_uuid128_t packetCharacteristicUuid {
         .u {.type = BLE_UUID_TYPE_128},
         .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x32, 0x15, 0x00, 0x00}};

src/components/ble/HeartRateService.h

@@ -21,14 +21,14 @@ namespace Pinetime {
       void SubscribeNotification(uint16_t attributeHandle);
       void UnsubscribeNotification(uint16_t attributeHandle);
 
+      static constexpr uint16_t heartRateServiceId {0x180D};
+      static constexpr ble_uuid16_t heartRateServiceUuid {.u {.type = BLE_UUID_TYPE_16}, .value = heartRateServiceId};
+
     private:
       NimbleController& nimble;
       Controllers::HeartRateController& heartRateController;
-      static constexpr uint16_t heartRateServiceId {0x180D};
       static constexpr uint16_t heartRateMeasurementId {0x2A37};
 
-      static constexpr ble_uuid16_t heartRateServiceUuid {.u {.type = BLE_UUID_TYPE_16}, .value = heartRateServiceId};
-
       static constexpr ble_uuid16_t heartRateMeasurementUuid {.u {.type = BLE_UUID_TYPE_16}, .value = heartRateMeasurementId};
 
       struct ble_gatt_chr_def characteristicDefinition[2];

src/components/ble/MusicService.cpp

@@ -18,6 +18,8 @@
 #include "components/ble/MusicService.h"
 #include "components/ble/NimbleController.h"
 #include <cstring>
+#include <FreeRTOS.h>
+#include <task.h>
 
 namespace {
   // 0000yyxx-78fc-48fe-8e23-433b3a1942d0

src/components/ble/MusicService.h

@@ -25,6 +25,7 @@
 #include <host/ble_uuid.h>
 #undef max
 #undef min
+#include <FreeRTOS.h>
 
 namespace Pinetime {
   namespace Controllers {

src/components/ble/NimbleController.cpp

@@ -158,7 +158,10 @@ void NimbleController::StartAdvertising() {
   }
 
   fields.flags = BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP;
-  fields.uuids128 = &dfuServiceUuid;
+  fields.uuids16 = &HeartRateService::heartRateServiceUuid;
+  fields.num_uuids16 = 1;
+  fields.uuids16_is_complete = 1;
+  fields.uuids128 = &DfuService::serviceUuid;
   fields.num_uuids128 = 1;
   fields.uuids128_is_complete = 1;
   fields.tx_pwr_lvl = BLE_HS_ADV_TX_PWR_LVL_AUTO;
@@ -451,9 +454,15 @@ void NimbleController::PersistBond(struct ble_gap_conn_desc& desc) {
     /* Wakeup Spi and SpiNorFlash before accessing the file system
      * This should be fixed in the FS driver
      */
-    systemTask.PushMessage(Pinetime::System::Messages::GoToRunning);
     systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
-    vTaskDelay(10);
+
+    // This isn't quite correct
+    // SystemTask could receive EnableSleeping right after passing this check
+    // We need some guarantee that the SystemTask has processed the above message
+    // before we can continue
+    while (!systemTask.IsSleepDisabled()) {
+      vTaskDelay(pdMS_TO_TICKS(5));
+    }
 
     lfs_file_t file_p;
 

src/components/ble/NimbleController.h

@@ -112,10 +112,6 @@ namespace Pinetime {
       uint16_t connectionHandle = BLE_HS_CONN_HANDLE_NONE;
       uint8_t fastAdvCount = 0;
       uint8_t bondId[16] = {0};
-
-      ble_uuid128_t dfuServiceUuid {
-        .u {.type = BLE_UUID_TYPE_128},
-        .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x30, 0x15, 0x00, 0x00}};
     };
 
     static NimbleController* nptr;

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/heartrate/Ppg.cpp

@@ -142,7 +142,7 @@ Ppg::Ppg() {
   spectrum.fill(0.0f);
 }
 
-int8_t Ppg::Preprocess(uint32_t hrs, uint32_t als) {
+int8_t Ppg::Preprocess(uint16_t hrs, uint16_t als) {
   if (dataIndex < dataLength) {
     dataHRS[dataIndex++] = hrs;
   }

src/components/heartrate/Ppg.h

@@ -14,7 +14,7 @@ namespace Pinetime {
     class Ppg {
     public:
       Ppg();
-      int8_t Preprocess(uint32_t hrs, uint32_t als);
+      int8_t Preprocess(uint16_t hrs, uint16_t als);
       int HeartRate();
       void Reset(bool resetDaqBuffer);
       static constexpr int deltaTms = 100;

src/components/settings/Settings.h

@@ -53,7 +53,7 @@ namespace Pinetime {
       enum class HeartRateBackgroundMeasurementInterval : uint8_t {
         Off,
         Continuous,
-        TenSeconds,
+        FifteenSeconds,
         ThirtySeconds,
         OneMinute,
         FiveMinutes,
@@ -225,6 +225,21 @@ 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;
@@ -308,13 +323,15 @@ namespace Pinetime {
     private:
       Pinetime::Controllers::FS& fs;
 
-      static constexpr uint32_t settingsVersion = 0x0008;
+      static constexpr uint32_t settingsVersion = 0x0009;
 
       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

@@ -82,7 +82,8 @@ 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},
@@ -98,6 +99,7 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
     brightnessController {brightnessController},
     touchHandler {touchHandler},
     filesystem {filesystem},
+    spiNorFlash {spiNorFlash},
     lvgl {lcd, filesystem},
     timer(this, TimerCallback),
     controllers {batteryController,
@@ -155,6 +157,36 @@ 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;
@@ -178,21 +210,6 @@ void DisplayApp::Refresh() {
     LoadScreen(returnAppStack.Pop(), returnDirection);
   };
 
-  auto DimScreen = [this]() {
-    if (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
-      isDimmed = true;
-      brightnessController.Set(Controllers::BrightnessController::Levels::Low);
-    }
-  };
-
-  auto RestoreBrightness = [this]() {
-    if (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
-      isDimmed = false;
-      lv_disp_trig_activity(nullptr);
-      ApplyBrightness();
-    }
-  };
-
   auto IsPastDimTime = [this]() -> bool {
     return lv_disp_get_inactive_time(nullptr) >= pdMS_TO_TICKS(settingsController.GetScreenTimeOut() - 2000);
   };
@@ -204,7 +221,29 @@ 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()) {
@@ -214,14 +253,27 @@ void DisplayApp::Refresh() {
 
       if (!systemTask->IsSleepDisabled() && IsPastDimTime()) {
         if (!isDimmed) {
-          DimScreen();
+          isDimmed = true;
+          brightnessController.Set(Controllers::BrightnessController::Levels::Low);
         }
-        if (IsPastSleepTime()) {
-          systemTask->PushMessage(System::Messages::GoToSleep);
-          state = States::Idle;
+        if (IsPastSleepTime() && uxQueueMessagesWaiting(msgQueue) == 0) {
+          PushMessageToSystemTask(System::Messages::GoToSleep);
+          // Can't set state to Idle here, something may send
+          // DisableSleeping before this GoToSleep arrives
+          // Instead we check we have no messages queued before sending GoToSleep
+          // This works as the SystemTask is higher priority than DisplayApp
+          // As soon as we send GoToSleep, SystemTask pre-empts DisplayApp
+          // Whenever DisplayApp is running again, it is guaranteed that
+          // SystemTask has handled the message
+          // If it responded, we will have a GoToSleep waiting in the queue
+          // By checking that there are no messages in the queue, we avoid
+          // resending GoToSleep when we already have a response
+          // SystemTask is resilient to duplicate messages, this is an
+          // optimisation to reduce pressure on the message queues
         }
       } else if (isDimmed) {
-        RestoreBrightness();
+        isDimmed = false;
+        ApplyBrightness();
       }
       break;
     default:
@@ -232,30 +284,58 @@ void DisplayApp::Refresh() {
   Messages msg;
   if (xQueueReceive(msgQueue, &msg, queueTimeout) == pdTRUE) {
     switch (msg) {
-      case Messages::DimScreen:
-        DimScreen();
-        break;
-      case Messages::RestoreBrightness:
-        RestoreBrightness();
-        break;
       case Messages::GoToSleep:
-        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
+        if (state != States::Running) {
+          break;
+        }
+        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Low) {
           brightnessController.Lower();
           vTaskDelay(100);
         }
-        lcd.Sleep();
+        // Turn brightness down (or set to AlwaysOn mode)
+        if (settingsController.GetAlwaysOnDisplay()) {
+          brightnessController.Set(Controllers::BrightnessController::Levels::AlwaysOn);
+        } else {
+          brightnessController.Set(Controllers::BrightnessController::Levels::Off);
+        }
+        // Since the active screen is not really an app, go back to Clock.
+        if (currentApp == Apps::Launcher || currentApp == Apps::Notifications || currentApp == Apps::QuickSettings ||
+            currentApp == Apps::Settings) {
+          LoadScreen(Apps::Clock, DisplayApp::FullRefreshDirections::None);
+          // Wait for the clock app to load before moving on.
+          while (!lv_task_handler()) {
+          };
+        }
+        // Turn LCD display off (or set to low power for AlwaysOn mode)
+        if (settingsController.GetAlwaysOnDisplay()) {
+          lcd.LowPowerOn();
+          // Record idle entry time
+          alwaysOnTickCount = 0;
+          alwaysOnStartTime = xTaskGetTickCount();
+        } else {
+          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 (state == States::Running) {
+          break;
+        }
+        if (settingsController.GetAlwaysOnDisplay()) {
+          lcd.LowPowerOff();
+        } else {
+          lcd.Wakeup();
+        }
         lv_disp_trig_activity(nullptr);
         ApplyBrightness();
         state = States::Running;
         break;
       case Messages::UpdateBleConnection:
-        //        clockScreen.SetBleConnectionState(bleController.IsConnected() ? Screens::Clock::BleConnectionStates::Connected :
-        //        Screens::Clock::BleConnectionStates::NotConnected);
+        // Only used for recovery firmware
         break;
       case Messages::NewNotification:
         LoadNewScreen(Apps::NotificationsPreview, DisplayApp::FullRefreshDirections::Down);
@@ -271,7 +351,7 @@ void DisplayApp::Refresh() {
         } else {
           LoadNewScreen(Apps::Timer, DisplayApp::FullRefreshDirections::Up);
         }
-        motorController.RunForDuration(35);
+        motorController.StartRinging();
         break;
       case Messages::AlarmTriggered:
         if (currentApp == Apps::Alarm) {
@@ -370,16 +450,11 @@ void DisplayApp::Refresh() {
       case Messages::BleRadioEnableToggle:
         PushMessageToSystemTask(System::Messages::BleRadioEnableToggle);
         break;
-      case Messages::UpdateDateTime:
-        // Added to remove warning
-        // What should happen here?
-        break;
       case Messages::Chime:
         LoadNewScreen(Apps::Clock, DisplayApp::FullRefreshDirections::None);
         motorController.RunForDuration(35);
         break;
       case Messages::OnChargingEvent:
-        RestoreBrightness();
         motorController.RunForDuration(15);
         break;
     }
@@ -511,7 +586,7 @@ void DisplayApp::LoadScreen(Apps app, DisplayApp::FullRefreshDirections directio
       currentScreen = std::make_unique<Screens::SettingHeartRate>(settingsController);
       break;
     case Apps::SettingDisplay:
-      currentScreen = std::make_unique<Screens::SettingDisplay>(this, settingsController);
+      currentScreen = std::make_unique<Screens::SettingDisplay>(settingsController);
       break;
     case Apps::SettingSteps:
       currentScreen = std::make_unique<Screens::SettingSteps>(settingsController);
@@ -539,7 +614,8 @@ 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

@@ -7,7 +7,6 @@ namespace Pinetime {
       enum class Messages : uint8_t {
         GoToSleep,
         GoToRunning,
-        UpdateDateTime,
         UpdateBleConnection,
         TouchEvent,
         ButtonPushed,
@@ -17,8 +16,9 @@ namespace Pinetime {
         NewNotification,
         TimerDone,
         BleFirmwareUpdateStarted,
-        DimScreen,
-        RestoreBrightness,
+        // Resets the screen timeout timer when awake
+        // Does nothing when asleep
+        NotifyDeviceActivity,
         ShowPairingKey,
         AlarmTriggered,
         Chime,

src/displayapp/screens/Alarm.cpp

@@ -48,7 +48,7 @@ Alarm::Alarm(Controllers::AlarmController& alarmController,
              Controllers::Settings::ClockType clockType,
              System::SystemTask& systemTask,
              Controllers::MotorController& motorController)
-  : alarmController {alarmController}, systemTask {systemTask}, motorController {motorController} {
+  : alarmController {alarmController}, wakeLock(systemTask), motorController {motorController} {
 
   hourCounter.Create();
   lv_obj_align(hourCounter.GetObject(), nullptr, LV_ALIGN_IN_TOP_LEFT, 0, 0);
@@ -117,7 +117,7 @@ Alarm::Alarm(Controllers::AlarmController& alarmController,
 
   UpdateAlarmTime();
 
-  if (alarmController.State() == Controllers::AlarmController::AlarmState::Alerting) {
+  if (alarmController.IsAlerting()) {
     SetAlerting();
   } else {
     SetSwitchState(LV_ANIM_OFF);
@@ -125,14 +125,15 @@ Alarm::Alarm(Controllers::AlarmController& alarmController,
 }
 
 Alarm::~Alarm() {
-  if (alarmController.State() == AlarmController::AlarmState::Alerting) {
+  if (alarmController.IsAlerting()) {
     StopAlerting();
   }
   lv_obj_clean(lv_scr_act());
+  alarmController.SaveAlarm();
 }
 
 void Alarm::DisableAlarm() {
-  if (alarmController.State() == AlarmController::AlarmState::Set) {
+  if (alarmController.IsEnabled()) {
     alarmController.DisableAlarm();
     lv_switch_off(enableSwitch, LV_ANIM_ON);
   }
@@ -172,7 +173,7 @@ bool Alarm::OnButtonPushed() {
     HideInfo();
     return true;
   }
-  if (alarmController.State() == AlarmController::AlarmState::Alerting) {
+  if (alarmController.IsAlerting()) {
     StopAlerting();
     return true;
   }
@@ -181,7 +182,7 @@ bool Alarm::OnButtonPushed() {
 
 bool Alarm::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
   // Don't allow closing the screen by swiping while the alarm is alerting
-  return alarmController.State() == AlarmController::AlarmState::Alerting && event == TouchEvents::SwipeDown;
+  return alarmController.IsAlerting() && event == TouchEvents::SwipeDown;
 }
 
 void Alarm::OnValueChanged() {
@@ -205,7 +206,7 @@ void Alarm::SetAlerting() {
   lv_obj_set_hidden(btnStop, false);
   taskStopAlarm = lv_task_create(StopAlarmTaskCallback, pdMS_TO_TICKS(60 * 1000), LV_TASK_PRIO_MID, this);
   motorController.StartRinging();
-  systemTask.PushMessage(System::Messages::DisableSleeping);
+  wakeLock.Lock();
 }
 
 void Alarm::StopAlerting() {
@@ -216,21 +217,16 @@ void Alarm::StopAlerting() {
     lv_task_del(taskStopAlarm);
     taskStopAlarm = nullptr;
   }
-  systemTask.PushMessage(System::Messages::EnableSleeping);
+  wakeLock.Release();
   lv_obj_set_hidden(enableSwitch, false);
   lv_obj_set_hidden(btnStop, true);
 }
 
 void Alarm::SetSwitchState(lv_anim_enable_t anim) {
-  switch (alarmController.State()) {
-    case AlarmController::AlarmState::Set:
-      lv_switch_on(enableSwitch, anim);
-      break;
-    case AlarmController::AlarmState::Not_Set:
-      lv_switch_off(enableSwitch, anim);
-      break;
-    default:
-      break;
+  if (alarmController.IsEnabled()) {
+    lv_switch_on(enableSwitch, anim);
+  } else {
+    lv_switch_off(enableSwitch, anim);
   }
 }
 
@@ -247,7 +243,7 @@ void Alarm::ShowInfo() {
   txtMessage = lv_label_create(btnMessage, nullptr);
   lv_obj_set_style_local_bg_color(btnMessage, LV_BTN_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_NAVY);
 
-  if (alarmController.State() == AlarmController::AlarmState::Set) {
+  if (alarmController.IsEnabled()) {
     auto timeToAlarm = alarmController.SecondsToAlarm();
 
     auto daysToAlarm = timeToAlarm / 86400;

src/displayapp/screens/Alarm.h

@@ -22,6 +22,7 @@
 #include "displayapp/screens/Screen.h"
 #include "displayapp/widgets/Counter.h"
 #include "displayapp/Controllers.h"
+#include "systemtask/WakeLock.h"
 #include "Symbols.h"
 
 namespace Pinetime {
@@ -43,7 +44,7 @@ namespace Pinetime {
 
       private:
         Controllers::AlarmController& alarmController;
-        System::SystemTask& systemTask;
+        System::WakeLock wakeLock;
         Controllers::MotorController& motorController;
 
         lv_obj_t *btnStop, *txtStop, *btnRecur, *txtRecur, *btnInfo, *enableSwitch;

src/displayapp/screens/FirmwareValidation.cpp

@@ -17,8 +17,8 @@ namespace {
 FirmwareValidation::FirmwareValidation(Pinetime::Controllers::FirmwareValidator& validator) : validator {validator} {
   labelVersion = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_text_fmt(labelVersion,
-                        "Version : %lu.%lu.%lu\n"
-                        "ShortRef : %s",
+                        "Version: %lu.%lu.%lu\n"
+                        "ShortRef: %s",
                         Version::Major(),
                         Version::Minor(),
                         Version::Patch(),

src/displayapp/screens/FlashLight.cpp

@@ -15,8 +15,9 @@ namespace {
 }
 
 FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessController& brightnessController)
-  : systemTask {systemTask}, brightnessController {brightnessController} {
+  : wakeLock(systemTask), brightnessController {brightnessController} {
 
+  previousBrightnessLevel = brightnessController.Level();
   brightnessController.Set(Controllers::BrightnessController::Levels::Low);
 
   flashLight = lv_label_create(lv_scr_act(), nullptr);
@@ -46,13 +47,13 @@ FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessCo
   backgroundAction->user_data = this;
   lv_obj_set_event_cb(backgroundAction, EventHandler);
 
-  systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
+  wakeLock.Lock();
 }
 
 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);
-  systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
+  brightnessController.Set(previousBrightnessLevel);
 }
 
 void FlashLight::SetColors() {

src/displayapp/screens/FlashLight.h

@@ -3,6 +3,7 @@
 #include "displayapp/screens/Screen.h"
 #include "components/brightness/BrightnessController.h"
 #include "systemtask/SystemTask.h"
+#include "systemtask/WakeLock.h"
 #include <cstdint>
 #include <lvgl/lvgl.h>
 
@@ -23,10 +24,11 @@ namespace Pinetime {
         void SetIndicators();
         void SetColors();
 
-        Pinetime::System::SystemTask& systemTask;
+        Pinetime::System::WakeLock wakeLock;
         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/HeartRate.cpp

@@ -29,7 +29,7 @@ namespace {
 }
 
 HeartRate::HeartRate(Controllers::HeartRateController& heartRateController, System::SystemTask& systemTask)
-  : heartRateController {heartRateController}, systemTask {systemTask} {
+  : heartRateController {heartRateController}, wakeLock(systemTask) {
   bool isHrRunning = heartRateController.State() != Controllers::HeartRateController::States::Stopped;
   label_hr = lv_label_create(lv_scr_act(), nullptr);
 
@@ -63,7 +63,7 @@ HeartRate::HeartRate(Controllers::HeartRateController& heartRateController, Syst
   label_startStop = lv_label_create(btn_startStop, nullptr);
   UpdateStartStopButton(isHrRunning);
   if (isHrRunning) {
-    systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
+    wakeLock.Lock();
   }
 
   taskRefresh = lv_task_create(RefreshTaskCallback, 100, LV_TASK_PRIO_MID, this);
@@ -72,7 +72,6 @@ HeartRate::HeartRate(Controllers::HeartRateController& heartRateController, Syst
 HeartRate::~HeartRate() {
   lv_task_del(taskRefresh);
   lv_obj_clean(lv_scr_act());
-  systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
 }
 
 void HeartRate::Refresh() {
@@ -101,12 +100,12 @@ void HeartRate::OnStartStopEvent(lv_event_t event) {
     if (heartRateController.State() == Controllers::HeartRateController::States::Stopped) {
       heartRateController.Start();
       UpdateStartStopButton(heartRateController.State() != Controllers::HeartRateController::States::Stopped);
-      systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
+      wakeLock.Lock();
       lv_obj_set_style_local_text_color(label_hr, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::highlight);
     } else {
       heartRateController.Stop();
       UpdateStartStopButton(heartRateController.State() != Controllers::HeartRateController::States::Stopped);
-      systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
+      wakeLock.Release();
       lv_obj_set_style_local_text_color(label_hr, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
     }
   }

src/displayapp/screens/HeartRate.h

@@ -4,6 +4,7 @@
 #include <chrono>
 #include "displayapp/screens/Screen.h"
 #include "systemtask/SystemTask.h"
+#include "systemtask/WakeLock.h"
 #include "Symbols.h"
 #include <lvgl/src/lv_core/lv_style.h>
 #include <lvgl/src/lv_core/lv_obj.h>
@@ -27,7 +28,7 @@ namespace Pinetime {
 
       private:
         Controllers::HeartRateController& heartRateController;
-        Pinetime::System::SystemTask& systemTask;
+        Pinetime::System::WakeLock wakeLock;
         void UpdateStartStopButton(bool isRunning);
         lv_obj_t* label_hr;
         lv_obj_t* label_bpm;

src/displayapp/screens/Metronome.cpp

@@ -22,7 +22,7 @@ namespace {
 }
 
 Metronome::Metronome(Controllers::MotorController& motorController, System::SystemTask& systemTask)
-  : motorController {motorController}, systemTask {systemTask} {
+  : motorController {motorController}, wakeLock(systemTask) {
 
   bpmArc = lv_arc_create(lv_scr_act(), nullptr);
   bpmArc->user_data = this;
@@ -72,7 +72,6 @@ Metronome::Metronome(Controllers::MotorController& motorController, System::Syst
 
 Metronome::~Metronome() {
   lv_task_del(taskRefresh);
-  systemTask.PushMessage(System::Messages::EnableSleeping);
   lv_obj_clean(lv_scr_act());
 }
 
@@ -128,12 +127,12 @@ void Metronome::OnEvent(lv_obj_t* obj, lv_event_t event) {
         metronomeStarted = !metronomeStarted;
         if (metronomeStarted) {
           lv_label_set_text_static(lblPlayPause, Symbols::pause);
-          systemTask.PushMessage(System::Messages::DisableSleeping);
+          wakeLock.Lock();
           startTime = xTaskGetTickCount();
           counter = 1;
         } else {
           lv_label_set_text_static(lblPlayPause, Symbols::play);
-          systemTask.PushMessage(System::Messages::EnableSleeping);
+          wakeLock.Release();
         }
       }
       break;

src/displayapp/screens/Metronome.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "systemtask/SystemTask.h"
+#include "systemtask/WakeLock.h"
 #include "components/motor/MotorController.h"
 #include "displayapp/screens/Screen.h"
 #include "Symbols.h"
@@ -21,7 +22,7 @@ namespace Pinetime {
         TickType_t startTime = 0;
         TickType_t tappedTime = 0;
         Controllers::MotorController& motorController;
-        System::SystemTask& systemTask;
+        System::WakeLock wakeLock;
         int16_t bpm = 120;
         uint8_t bpb = 4;
         uint8_t counter = 1;

src/displayapp/screens/Notifications.cpp

@@ -20,7 +20,7 @@ Notifications::Notifications(DisplayApp* app,
     notificationManager {notificationManager},
     alertNotificationService {alertNotificationService},
     motorController {motorController},
-    systemTask {systemTask},
+    wakeLock(systemTask),
     mode {mode} {
 
   notificationManager.ClearNewNotificationFlag();
@@ -40,7 +40,7 @@ Notifications::Notifications(DisplayApp* app,
     validDisplay = false;
   }
   if (mode == Modes::Preview) {
-    systemTask.PushMessage(System::Messages::DisableSleeping);
+    wakeLock.Lock();
     if (notification.category == Controllers::NotificationManager::Categories::IncomingCall) {
       motorController.StartRinging();
     } else {
@@ -65,7 +65,6 @@ Notifications::~Notifications() {
   lv_task_del(taskRefresh);
   // make sure we stop any vibrations before exiting
   motorController.StopRinging();
-  systemTask.PushMessage(System::Messages::EnableSleeping);
   lv_obj_clean(lv_scr_act());
 }
 
@@ -82,7 +81,6 @@ void Notifications::Refresh() {
 
   } else if (mode == Modes::Preview && dismissingNotification) {
     running = false;
-    currentItem = std::make_unique<NotificationItem>(alertNotificationService, motorController);
 
   } else if (dismissingNotification) {
     dismissingNotification = false;
@@ -113,15 +111,15 @@ void Notifications::Refresh() {
                                                        alertNotificationService,
                                                        motorController);
     } else {
-      currentItem = std::make_unique<NotificationItem>(alertNotificationService, motorController);
+      running = false;
     }
   }
 
-  running = currentItem->IsRunning() && running;
+  running = running && currentItem->IsRunning();
 }
 
 void Notifications::OnPreviewInteraction() {
-  systemTask.PushMessage(System::Messages::EnableSleeping);
+  wakeLock.Release();
   motorController.StopRinging();
   if (timeoutLine != nullptr) {
     lv_obj_del(timeoutLine);
@@ -173,7 +171,9 @@ bool Notifications::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
         } else if (nextMessage.valid) {
           currentId = nextMessage.id;
         } else {
-          // don't update id, won't be found be refresh and try to load latest message or no message box
+          // don't update id, notification manager will try to fetch
+          // but not find it. Refresh will try to load latest message
+          // or dismiss to watchface
         }
         DismissToBlack();
         return true;

src/displayapp/screens/Notifications.h

@@ -8,6 +8,7 @@
 #include "components/ble/NotificationManager.h"
 #include "components/motor/MotorController.h"
 #include "systemtask/SystemTask.h"
+#include "systemtask/WakeLock.h"
 
 namespace Pinetime {
   namespace Controllers {
@@ -73,7 +74,7 @@ namespace Pinetime {
         Pinetime::Controllers::NotificationManager& notificationManager;
         Pinetime::Controllers::AlertNotificationService& alertNotificationService;
         Pinetime::Controllers::MotorController& motorController;
-        System::SystemTask& systemTask;
+        System::WakeLock wakeLock;
         Modes mode = Modes::Normal;
         std::unique_ptr<NotificationItem> currentItem;
         Pinetime::Controllers::NotificationManager::Notification::Id currentId;

src/displayapp/screens/StopWatch.cpp

@@ -34,7 +34,7 @@ namespace {
   constexpr TickType_t blinkInterval = pdMS_TO_TICKS(1000);
 }
 
-StopWatch::StopWatch(System::SystemTask& systemTask) : systemTask {systemTask} {
+StopWatch::StopWatch(System::SystemTask& systemTask) : wakeLock(systemTask) {
   static constexpr uint8_t btnWidth = 115;
   static constexpr uint8_t btnHeight = 80;
   btnPlayPause = lv_btn_create(lv_scr_act(), nullptr);
@@ -79,7 +79,6 @@ StopWatch::StopWatch(System::SystemTask& systemTask) : systemTask {systemTask} {
 
 StopWatch::~StopWatch() {
   lv_task_del(taskRefresh);
-  systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
   lv_obj_clean(lv_scr_act());
 }
 
@@ -135,7 +134,7 @@ void StopWatch::Start() {
   SetInterfaceRunning();
   startTime = xTaskGetTickCount();
   currentState = States::Running;
-  systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
+  wakeLock.Lock();
 }
 
 void StopWatch::Pause() {
@@ -145,7 +144,7 @@ void StopWatch::Pause() {
   oldTimeElapsed = laps[lapsDone];
   blinkTime = xTaskGetTickCount() + blinkInterval;
   currentState = States::Halted;
-  systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
+  wakeLock.Release();
 }
 
 void StopWatch::Refresh() {

src/displayapp/screens/StopWatch.h

@@ -7,6 +7,7 @@
 #include "portmacro_cmsis.h"
 
 #include "systemtask/SystemTask.h"
+#include "systemtask/WakeLock.h"
 #include "displayapp/apps/Apps.h"
 #include "displayapp/Controllers.h"
 #include "Symbols.h"
@@ -43,7 +44,7 @@ namespace Pinetime {
         void Start();
         void Pause();
 
-        Pinetime::System::SystemTask& systemTask;
+        Pinetime::System::WakeLock wakeLock;
         States currentState = States::Init;
         TickType_t startTime;
         TickType_t oldTimeElapsed = 0;

src/displayapp/screens/SystemInfo.cpp

@@ -38,15 +38,16 @@ 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)
-  : app {app},
-    dateTimeController {dateTimeController},
+                       const Pinetime::Drivers::Cst816S& touchPanel,
+                       const Pinetime::Drivers::SpiNorFlash& spiNorFlash)
+  : dateTimeController {dateTimeController},
     batteryController {batteryController},
     brightnessController {brightnessController},
     bleController {bleController},
     watchdog {watchdog},
     motionController {motionController},
     touchPanel {touchPanel},
+    spiNorFlash {spiNorFlash},
     screens {app,
              0,
              {[this]() -> std::unique_ptr<Screen> {
@@ -186,10 +187,12 @@ 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 +205,9 @@ 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

@@ -29,12 +29,12 @@ 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;
 
       private:
-        DisplayApp* app;
         Pinetime::Controllers::DateTime& dateTimeController;
         const Pinetime::Controllers::Battery& batteryController;
         Pinetime::Controllers::BrightnessController& brightnessController;
@@ -42,6 +42,7 @@ 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/Timer.cpp

@@ -104,9 +104,7 @@ void Timer::UpdateMask() {
 
 void Timer::Refresh() {
   if (timer.IsRunning()) {
-    auto secondsRemaining = std::chrono::duration_cast<std::chrono::seconds>(timer.GetTimeRemaining());
-    minuteCounter.SetValue(secondsRemaining.count() / 60);
-    secondCounter.SetValue(secondsRemaining.count() % 60);
+    DisplayTime();
   } else if (buttonPressing && xTaskGetTickCount() > pressTime + pdMS_TO_TICKS(150)) {
     lv_label_set_text_static(txtPlayPause, "Reset");
     maskPosition += 15;
@@ -119,6 +117,14 @@ void Timer::Refresh() {
   }
 }
 
+void Timer::DisplayTime() {
+  displaySeconds = std::chrono::duration_cast<std::chrono::seconds>(timer.GetTimeRemaining());
+  if (displaySeconds.IsUpdated()) {
+    minuteCounter.SetValue(displaySeconds.Get().count() / 60);
+    secondCounter.SetValue(displaySeconds.Get().count() % 60);
+  }
+}
+
 void Timer::SetTimerRunning() {
   minuteCounter.HideControls();
   secondCounter.HideControls();
@@ -133,9 +139,7 @@ void Timer::SetTimerStopped() {
 
 void Timer::ToggleRunning() {
   if (timer.IsRunning()) {
-    auto secondsRemaining = std::chrono::duration_cast<std::chrono::seconds>(timer.GetTimeRemaining());
-    minuteCounter.SetValue(secondsRemaining.count() / 60);
-    secondCounter.SetValue(secondsRemaining.count() % 60);
+    DisplayTime();
     timer.StopTimer();
     SetTimerStopped();
   } else if (secondCounter.GetValue() + minuteCounter.GetValue() > 0) {
@@ -147,7 +151,6 @@ void Timer::ToggleRunning() {
 }
 
 void Timer::Reset() {
-  minuteCounter.SetValue(0);
-  secondCounter.SetValue(0);
+  DisplayTime();
   SetTimerStopped();
 }

src/displayapp/screens/Timer.h

@@ -5,6 +5,7 @@
 #include "systemtask/SystemTask.h"
 #include "displayapp/LittleVgl.h"
 #include "displayapp/widgets/Counter.h"
+#include "utility/DirtyValue.h"
 #include <lvgl/lvgl.h>
 
 #include "components/timer/Timer.h"
@@ -26,6 +27,7 @@ namespace Pinetime::Applications {
       void SetTimerRunning();
       void SetTimerStopped();
       void UpdateMask();
+      void DisplayTime();
       Pinetime::Controllers::Timer& timer;
 
       lv_obj_t* btnPlayPause;
@@ -43,6 +45,7 @@ namespace Pinetime::Applications {
       bool buttonPressing = false;
       lv_coord_t maskPosition = 0;
       TickType_t pressTime = 0;
+      Utility::DirtyValue<std::chrono::seconds> displaySeconds;
     };
   }
 

src/displayapp/screens/settings/SettingDisplay.cpp

@@ -9,16 +9,22 @@
 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;
 
-SettingDisplay::SettingDisplay(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Settings& settingsController)
-  : app {app}, settingsController {settingsController} {
+SettingDisplay::SettingDisplay(Pinetime::Controllers::Settings& settingsController) : settingsController {settingsController} {
 
   lv_obj_t* container1 = lv_cont_create(lv_scr_act(), nullptr);
 
@@ -49,13 +55,20 @@ 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 +76,11 @@ 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

@@ -14,17 +14,18 @@ namespace Pinetime {
 
       class SettingDisplay : public Screen {
       public:
-        SettingDisplay(DisplayApp* app, Pinetime::Controllers::Settings& settingsController);
+        SettingDisplay(Pinetime::Controllers::Settings& settingsController);
         ~SettingDisplay() override;
 
         void UpdateSelected(lv_obj_t* object, lv_event_t event);
+        void ToggleAlwaysOn();
 
       private:
-        DisplayApp* app;
         static constexpr std::array<uint16_t, 6> options = {5000, 7000, 10000, 15000, 20000, 30000};
 
         Controllers::Settings& settingsController;
         lv_obj_t* cbOption[options.size()];
+        lv_obj_t* alwaysOnCheckbox;
       };
     }
   }

src/displayapp/screens/settings/SettingHeartRate.h

@@ -32,7 +32,7 @@ namespace Pinetime {
         static constexpr std::array<Option, 8> options = {{
           {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::Off, " Off"},
           {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::Continuous, "Cont"},
-          {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::TenSeconds, " 10s"},
+          {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::FifteenSeconds, " 15s"},
           {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::ThirtySeconds, " 30s"},
           {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::OneMinute, "  1m"},
           {Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::FiveMinutes, "  5m"},

src/displayapp/screens/settings/SettingSetDateTime.cpp

@@ -15,8 +15,7 @@ bool SettingSetDateTime::OnTouchEvent(Pinetime::Applications::TouchEvents event)
 SettingSetDateTime::SettingSetDateTime(Pinetime::Applications::DisplayApp* app,
                                        Pinetime::Controllers::DateTime& dateTimeController,
                                        Pinetime::Controllers::Settings& settingsController)
-  : app {app},
-    dateTimeController {dateTimeController},
+  : dateTimeController {dateTimeController},
     settingsController {settingsController},
     screens {app,
              0,

src/displayapp/screens/settings/SettingSetDateTime.h

@@ -20,7 +20,6 @@ namespace Pinetime {
         void Quit();
 
       private:
-        DisplayApp* app;
         Controllers::DateTime& dateTimeController;
         Controllers::Settings& settingsController;
 

src/displayapp/screens/settings/SettingWatchFace.cpp

@@ -54,8 +54,7 @@ SettingWatchFace::SettingWatchFace(Pinetime::Applications::DisplayApp* app,
                                    std::array<Screens::SettingWatchFace::Item, UserWatchFaceTypes::Count>&& watchfaceItems,
                                    Pinetime::Controllers::Settings& settingsController,
                                    Pinetime::Controllers::FS& filesystem)
-  : app {app},
-    watchfaceItems {std::move(watchfaceItems)},
+  : watchfaceItems {std::move(watchfaceItems)},
     settingsController {settingsController},
     filesystem {filesystem},
     screens {app, 0, CreateScreenList(), Screens::ScreenListModes::UpDown} {

src/displayapp/screens/settings/SettingWatchFace.h

@@ -34,7 +34,6 @@ namespace Pinetime {
         bool OnTouchEvent(TouchEvents event) override;
 
       private:
-        DisplayApp* app;
         auto CreateScreenList() const;
         std::unique_ptr<Screen> CreateScreen(unsigned int screenNum) const;
 

src/drivers/Hrs3300.cpp

@@ -6,6 +6,7 @@
 
 #include "drivers/Hrs3300.h"
 #include <algorithm>
+#include <iterator>
 #include <nrf_gpio.h>
 
 #include <FreeRTOS.h>
@@ -67,40 +68,37 @@ void Hrs3300::Disable() {
   WriteRegister(static_cast<uint8_t>(Registers::PDriver), 0);
 }
 
-uint32_t Hrs3300::ReadHrs() {
-  auto m = ReadRegister(static_cast<uint8_t>(Registers::C0DataM));
-  auto h = ReadRegister(static_cast<uint8_t>(Registers::C0DataH));
-  auto l = ReadRegister(static_cast<uint8_t>(Registers::C0dataL));
-  return ((l & 0x30) << 12) | (m << 8) | ((h & 0x0f) << 4) | (l & 0x0f);
-}
+Hrs3300::PackedHrsAls Hrs3300::ReadHrsAls() {
+  constexpr Registers dataRegisters[] =
+    {Registers::C1dataM, Registers::C0DataM, Registers::C0DataH, Registers::C1dataH, Registers::C1dataL, Registers::C0dataL};
+  // Calculate smallest register address
+  constexpr uint8_t baseOffset = static_cast<uint8_t>(*std::min_element(std::begin(dataRegisters), std::end(dataRegisters)));
+  // Calculate largest address to determine length of read needed
+  // Add one to largest relative index to find the length
+  constexpr uint8_t length = static_cast<uint8_t>(*std::max_element(std::begin(dataRegisters), std::end(dataRegisters))) - baseOffset + 1;
 
-uint32_t Hrs3300::ReadAls() {
-  auto m = ReadRegister(static_cast<uint8_t>(Registers::C1dataM));
-  auto h = ReadRegister(static_cast<uint8_t>(Registers::C1dataH));
-  auto l = ReadRegister(static_cast<uint8_t>(Registers::C1dataL));
-  return ((h & 0x3f) << 11) | (m << 3) | (l & 0x07);
-}
-
-void Hrs3300::SetGain(uint8_t gain) {
-  constexpr uint8_t maxGain = 64U;
-  gain = std::min(gain, maxGain);
-  uint8_t hgain = 0;
-  while ((1 << hgain) < gain) {
-    ++hgain;
+  Hrs3300::PackedHrsAls res;
+  uint8_t buf[length];
+  auto ret = twiMaster.Read(twiAddress, baseOffset, buf, length);
+  if (ret != TwiMaster::ErrorCodes::NoError) {
+    NRF_LOG_INFO("READ ERROR");
   }
+  // hrs
+  uint8_t m = static_cast<uint8_t>(Registers::C0DataM) - baseOffset;
+  uint8_t h = static_cast<uint8_t>(Registers::C0DataH) - baseOffset;
+  uint8_t l = static_cast<uint8_t>(Registers::C0dataL) - baseOffset;
+  // There are two extra bits (17 and 18) but they are not read here
+  // as resolutions >16bit aren't practically useful (too slow) and
+  // all hrs values throughout InfiniTime are 16bit
+  res.hrs = (buf[m] << 8) | ((buf[h] & 0x0f) << 4) | (buf[l] & 0x0f);
 
-  WriteRegister(static_cast<uint8_t>(Registers::Hgain), hgain << 2);
-}
+  // als
+  m = static_cast<uint8_t>(Registers::C1dataM) - baseOffset;
+  h = static_cast<uint8_t>(Registers::C1dataH) - baseOffset;
+  l = static_cast<uint8_t>(Registers::C1dataL) - baseOffset;
+  res.als = ((buf[h] & 0x3f) << 11) | (buf[m] << 3) | (buf[l] & 0x07);
 
-void Hrs3300::SetDrive(uint8_t drive) {
-  auto en = ReadRegister(static_cast<uint8_t>(Registers::Enable));
-  auto pd = ReadRegister(static_cast<uint8_t>(Registers::PDriver));
-
-  en = (en & 0xf7) | ((drive & 2) << 2);
-  pd = (pd & 0xbf) | ((drive & 1) << 6);
-
-  WriteRegister(static_cast<uint8_t>(Registers::Enable), en);
-  WriteRegister(static_cast<uint8_t>(Registers::PDriver), pd);
+  return res;
 }
 
 void Hrs3300::WriteRegister(uint8_t reg, uint8_t data) {

src/drivers/Hrs3300.h

@@ -21,6 +21,11 @@ namespace Pinetime {
         Hgain = 0x17
       };
 
+      struct PackedHrsAls {
+        uint16_t hrs;
+        uint16_t als;
+      };
+
       Hrs3300(TwiMaster& twiMaster, uint8_t twiAddress);
       Hrs3300(const Hrs3300&) = delete;
       Hrs3300& operator=(const Hrs3300&) = delete;
@@ -30,10 +35,7 @@ namespace Pinetime {
       void Init();
       void Enable();
       void Disable();
-      uint32_t ReadHrs();
-      uint32_t ReadAls();
-      void SetGain(uint8_t gain);
-      void SetDrive(uint8_t drive);
+      PackedHrsAls ReadHrsAls();
 
     private:
       TwiMaster& twiMaster;

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/heartratetask/HeartRateTask.cpp

@@ -97,11 +97,6 @@ void HeartRateTask::StopMeasurement() {
   vTaskDelay(100);
 }
 
-void HeartRateTask::StartWaiting() {
-  StopMeasurement();
-  backgroundWaitingStart = xTaskGetTickCount();
-}
-
 void HeartRateTask::HandleGoToSleep() {
   switch (state) {
     case States::ScreenOnAndStopped:
@@ -176,8 +171,7 @@ void HeartRateTask::HandleBackgroundWaiting() {
     return;
   }
 
-  TickType_t ticksSinceWaitingStart = xTaskGetTickCount() - backgroundWaitingStart;
-  if (ticksSinceWaitingStart >= GetHeartRateBackgroundMeasurementIntervalInTicks()) {
+  if (ShouldStartBackgroundMeasuring()) {
     state = States::ScreenOffAndMeasuring;
     StartMeasurement();
   }
@@ -198,34 +192,45 @@ void HeartRateTask::HandleSensorData(int* lastBpm) {
     bpm = 0;
   }
 
-  if (*lastBpm == 0 && bpm == 0) {
+  bool notEnoughData = *lastBpm == 0 && bpm == 0;
+  if (notEnoughData) {
     controller.Update(Controllers::HeartRateController::States::NotEnoughData, bpm);
   }
 
   if (bpm != 0) {
     *lastBpm = bpm;
     controller.Update(Controllers::HeartRateController::States::Running, bpm);
-    if (state == States::ScreenOnAndMeasuring || IsContinuousModeActivated()) {
-      return;
-    }
-    if (state == States::ScreenOffAndMeasuring) {
-      state = States::ScreenOffAndWaiting;
-      StartWaiting();
-    }
   }
-  TickType_t ticksSinceMeasurementStart = xTaskGetTickCount() - measurementStart;
-  if (bpm == 0 && state == States::ScreenOffAndMeasuring && !IsContinuousModeActivated() &&
-      ticksSinceMeasurementStart >= DURATION_UNTIL_BACKGROUND_MEASUREMENT_IS_STOPPED) {
+
+  if (state == States::ScreenOnAndMeasuring || IsContinuousModeActivated()) {
+    return;
+  } 
+
+  // state == States::ScreenOffAndMeasuring 
+  //    (because state != ScreenOnAndMeasuring and the only state that enables measuring is ScreenOffAndMeasuring)
+  // !IsContinuousModeActivated()
+
+  if (ShouldStartBackgroundMeasuring()) {
+    // This doesn't change the state but resets the measurment timer, which basically starts the next measurment without resetting the sensor.
+    // This is basically a fall back to continuous mode, when measurments take too long.
+    measurementStart = xTaskGetTickCount();
+    return;
+  }
+
+  bool noDataWithinTimeLimit = bpm == 0 && ShoudStopTryingToGetData();
+  bool dataWithinTimeLimit = bpm != 0;
+  if (dataWithinTimeLimit || noDataWithinTimeLimit) {
     state = States::ScreenOffAndWaiting;
-    StartWaiting();
+    StopMeasurement();
   }
+
 }
 
 TickType_t HeartRateTask::GetHeartRateBackgroundMeasurementIntervalInTicks() {
   int ms;
   switch (settings.GetHeartRateBackgroundMeasurementInterval()) {
-    case Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::TenSeconds:
-      ms = 10 * 1000;
+    case Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::FifteenSeconds:
+      ms = 15 * 1000;
       break;
     case Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::ThirtySeconds:
       ms = 30 * 1000;
@@ -258,3 +263,15 @@ bool HeartRateTask::IsBackgroundMeasurementActivated() {
   return settings.GetHeartRateBackgroundMeasurementInterval() !=
          Pinetime::Controllers::Settings::HeartRateBackgroundMeasurementInterval::Off;
 }
+
+TickType_t HeartRateTask::GetTicksSinceLastMeasurementStarted() {
+  return xTaskGetTickCount() - measurementStart;
+}
+
+bool HeartRateTask::ShoudStopTryingToGetData() {
+  return GetTicksSinceLastMeasurementStarted() >= DURATION_UNTIL_BACKGROUND_MEASUREMENT_IS_STOPPED;
+}
+
+bool HeartRateTask::ShouldStartBackgroundMeasuring() {
+  return GetTicksSinceLastMeasurementStarted() >= GetHeartRateBackgroundMeasurementIntervalInTicks();
+}

src/heartratetask/HeartRateTask.h

@@ -45,7 +45,6 @@ namespace Pinetime {
       static void Process(void* instance);
       void StartMeasurement();
       void StopMeasurement();
-      void StartWaiting();
 
       void HandleGoToSleep();
       void HandleWakeUp();
@@ -59,6 +58,10 @@ namespace Pinetime {
       bool IsContinuousModeActivated();
       bool IsBackgroundMeasurementActivated();
 
+      TickType_t GetTicksSinceLastMeasurementStarted();
+      bool ShoudStopTryingToGetData();
+      bool ShouldStartBackgroundMeasuring();
+
       TaskHandle_t taskHandle;
       QueueHandle_t messageQueue;
       States state = States::ScreenOnAndStopped;
@@ -66,7 +69,6 @@ namespace Pinetime {
       Controllers::HeartRateController& controller;
       Controllers::Settings& settings;
       Controllers::Ppg ppg;
-      TickType_t backgroundWaitingStart = 0;
       TickType_t measurementStart = 0;
     };
 

src/libs/QCBOR

@@ -1 +0,0 @@
-Subproject commit 56b17bf9f74096774944bcac0829adcd887d391e

src/main.cpp

@@ -104,7 +104,7 @@ Pinetime::Controllers::DateTime dateTimeController {settingsController};
 Pinetime::Drivers::Watchdog watchdog;
 Pinetime::Controllers::NotificationManager notificationManager;
 Pinetime::Controllers::MotionController motionController;
-Pinetime::Controllers::AlarmController alarmController {dateTimeController};
+Pinetime::Controllers::AlarmController alarmController {dateTimeController, fs};
 Pinetime::Controllers::TouchHandler touchHandler;
 Pinetime::Controllers::ButtonHandler buttonHandler;
 Pinetime::Controllers::BrightnessController brightnessController {};
@@ -123,7 +123,8 @@ Pinetime::Applications::DisplayApp displayApp(lcd,
                                               alarmController,
                                               brightnessController,
                                               touchHandler,
-                                              fs);
+                                              fs,
+                                              spiNorFlash);
 
 Pinetime::System::SystemTask systemTask(spi,
                                         spiNorFlash,

src/systemtask/SystemMonitor.cpp

@@ -1,5 +1,5 @@
 #include "systemtask/SystemTask.h"
-#if configUSE_TRACE_FACILITY == 1
+#if NRF_LOG_ENABLED
   // FreeRtosMonitor
   #include <FreeRTOS.h>
   #include <task.h>

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();
@@ -187,34 +189,14 @@ void SystemTask::Work() {
     if (xQueueReceive(systemTasksMsgQueue, &msg, 100) == pdTRUE) {
       switch (msg) {
         case Messages::EnableSleeping:
-          // Make sure that exiting an app doesn't enable sleeping,
-          // if the exiting was caused by a firmware update
-          if (!bleController.IsFirmwareUpdating()) {
-            doNotGoToSleep = false;
-          }
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          wakeLocksHeld--;
           break;
         case Messages::DisableSleeping:
-          doNotGoToSleep = true;
+          GoToRunning();
+          wakeLocksHeld++;
           break;
         case Messages::GoToRunning:
-          spi.Wakeup();
-
-          // Double Tap needs the touch screen to be in normal mode
-          if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
-            touchPanel.Wakeup();
-          }
-
-          spiNorFlash.Wakeup();
-
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::GoToRunning);
-          heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::WakeUp);
-
-          if (bleController.IsRadioEnabled() && !bleController.IsConnected()) {
-            nimbleController.RestartFastAdv();
-          }
-
-          state = SystemTaskState::Running;
+          GoToRunning();
           break;
         case Messages::TouchWakeUp: {
           if (touchHandler.ProcessTouchInfo(touchPanel.GetTouchInfo())) {
@@ -231,66 +213,50 @@ void SystemTask::Work() {
           break;
         }
         case Messages::GoToSleep:
-          if (doNotGoToSleep) {
-            break;
-          }
-          state = SystemTaskState::GoingToSleep; // Already set in PushMessage()
-          NRF_LOG_INFO("[systemtask] Going to sleep");
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::GoToSleep);
-          heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::GoToSleep);
+          GoToSleep();
           break;
         case Messages::OnNewTime:
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::UpdateDateTime);
-          if (alarmController.State() == Controllers::AlarmController::AlarmState::Set) {
+          if (alarmController.IsEnabled()) {
             alarmController.ScheduleAlarm();
           }
           break;
         case Messages::OnNewNotification:
           if (settingsController.GetNotificationStatus() == Pinetime::Controllers::Settings::Notification::On) {
-            if (state == SystemTaskState::Sleeping) {
+            if (IsSleeping()) {
               GoToRunning();
-            } else {
-              displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
             }
             displayApp.PushMessage(Pinetime::Applications::Display::Messages::NewNotification);
           }
           break;
         case Messages::SetOffAlarm:
-          if (state == SystemTaskState::Sleeping) {
-            GoToRunning();
-          }
+          GoToRunning();
           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;
         case Messages::BleFirmwareUpdateStarted:
-          doNotGoToSleep = true;
-          if (state == SystemTaskState::Sleeping) {
-            GoToRunning();
-          }
+          GoToRunning();
+          wakeLocksHeld++;
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::BleFirmwareUpdateStarted);
           break;
         case Messages::BleFirmwareUpdateFinished:
           if (bleController.State() == Pinetime::Controllers::Ble::FirmwareUpdateStates::Validated) {
             NVIC_SystemReset();
           }
-          doNotGoToSleep = false;
+          wakeLocksHeld--;
           break;
         case Messages::StartFileTransfer:
           NRF_LOG_INFO("[systemtask] FS Started");
-          doNotGoToSleep = true;
-          if (state == SystemTaskState::Sleeping) {
-            GoToRunning();
-          }
+          GoToRunning();
+          wakeLocksHeld++;
           // TODO add intent of fs access icon or something
           break;
         case Messages::StopFileTransfer:
           NRF_LOG_INFO("[systemtask] FS Stopped");
-          doNotGoToSleep = false;
+          wakeLocksHeld--;
           // TODO add intent of fs access icon or something
           break;
         case Messages::OnTouchEvent:
@@ -318,12 +284,23 @@ void SystemTask::Work() {
           HandleButtonAction(action);
         } break;
         case Messages::OnDisplayTaskSleeping:
+          // The state was set to GoingToSleep when GoToSleep() was called
+          // If the state is no longer GoingToSleep, we have since transitioned back to Running
+          // In this case absorb the OnDisplayTaskSleeping
+          // as DisplayApp is about to receive GoToRunning
+          if (state != SystemTaskState::GoingToSleep) {
+            break;
+          }
           if (BootloaderVersion::IsValid()) {
             // First versions of the bootloader do not expose their version and cannot initialize the SPI NOR FLASH
             // 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)) {
@@ -340,39 +317,23 @@ void SystemTask::Work() {
         case Messages::OnNewHour:
           using Pinetime::Controllers::AlarmController;
           if (settingsController.GetNotificationStatus() != Controllers::Settings::Notification::Sleep &&
-              settingsController.GetChimeOption() == Controllers::Settings::ChimesOption::Hours &&
-              alarmController.State() != AlarmController::AlarmState::Alerting) {
-            // if sleeping, we can't send a chime to displayApp yet (SPI flash switched off)
-            // request running first and repush the chime message
-            if (state == SystemTaskState::Sleeping) {
-              GoToRunning();
-              PushMessage(msg);
-            } else {
-              displayApp.PushMessage(Pinetime::Applications::Display::Messages::Chime);
-            }
+              settingsController.GetChimeOption() == Controllers::Settings::ChimesOption::Hours && !alarmController.IsAlerting()) {
+            GoToRunning();
+            displayApp.PushMessage(Pinetime::Applications::Display::Messages::Chime);
           }
           break;
         case Messages::OnNewHalfHour:
           using Pinetime::Controllers::AlarmController;
           if (settingsController.GetNotificationStatus() != Controllers::Settings::Notification::Sleep &&
-              settingsController.GetChimeOption() == Controllers::Settings::ChimesOption::HalfHours &&
-              alarmController.State() != AlarmController::AlarmState::Alerting) {
-            // if sleeping, we can't send a chime to displayApp yet (SPI flash switched off)
-            // request running first and repush the chime message
-            if (state == SystemTaskState::Sleeping) {
-              GoToRunning();
-              PushMessage(msg);
-            } else {
-              displayApp.PushMessage(Pinetime::Applications::Display::Messages::Chime);
-            }
+              settingsController.GetChimeOption() == Controllers::Settings::ChimesOption::HalfHours && !alarmController.IsAlerting()) {
+            GoToRunning();
+            displayApp.PushMessage(Pinetime::Applications::Display::Messages::Chime);
           }
           break;
         case Messages::OnChargingEvent:
           batteryController.ReadPowerState();
+          GoToRunning();
           displayApp.PushMessage(Applications::Display::Messages::OnChargingEvent);
-          if (state == SystemTaskState::Sleeping) {
-            GoToRunning();
-          }
           break;
         case Messages::MeasureBatteryTimerExpired:
           batteryController.MeasureVoltage();
@@ -381,9 +342,7 @@ void SystemTask::Work() {
           nimbleController.NotifyBatteryLevel(batteryController.PercentRemaining());
           break;
         case Messages::OnPairing:
-          if (state == SystemTaskState::Sleeping) {
-            GoToRunning();
-          }
+          GoToRunning();
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::ShowPairingKey);
           break;
         case Messages::BleRadioEnableToggle:
@@ -418,14 +377,50 @@ void SystemTask::Work() {
 #pragma clang diagnostic pop
 }
 
-void SystemTask::UpdateMotion() {
-  if (state == SystemTaskState::GoingToSleep || state == SystemTaskState::WakingUp) {
+void SystemTask::GoToRunning() {
+  if (state == SystemTaskState::Running) {
     return;
   }
+  // SPI doesn't go to sleep for always on mode
+  if (!settingsController.GetAlwaysOnDisplay()) {
+    spi.Wakeup();
+  }
 
-  if (state == SystemTaskState::Sleeping && !(settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::RaiseWrist) ||
-                                              settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::Shake) ||
-                                              motionController.GetService()->IsMotionNotificationSubscribed())) {
+  // Double Tap needs the touch screen to be in normal mode
+  if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
+    touchPanel.Wakeup();
+  }
+
+  spiNorFlash.Wakeup();
+
+  displayApp.PushMessage(Pinetime::Applications::Display::Messages::GoToRunning);
+  heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::WakeUp);
+
+  if (bleController.IsRadioEnabled() && !bleController.IsConnected()) {
+    nimbleController.RestartFastAdv();
+  }
+
+  state = SystemTaskState::Running;
+};
+
+void SystemTask::GoToSleep() {
+  if (IsSleeping()) {
+    return;
+  }
+  if (IsSleepDisabled()) {
+    return;
+  }
+  NRF_LOG_INFO("[systemtask] Going to sleep");
+  displayApp.PushMessage(Pinetime::Applications::Display::Messages::GoToSleep);
+  heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::GoToSleep);
+
+  state = SystemTaskState::GoingToSleep;
+};
+
+void SystemTask::UpdateMotion() {
+  if (IsSleeping() && !(settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::RaiseWrist) ||
+                        settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::Shake) ||
+                        motionController.GetService()->IsMotionNotificationSubscribed())) {
     return;
   }
 
@@ -448,7 +443,7 @@ void SystemTask::UpdateMotion() {
   }
   if (settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::LowerWrist) && state == SystemTaskState::Running &&
       motionController.ShouldLowerSleep()) {
-    PushMessage(Messages::GoToSleep);
+    GoToSleep();
   }
 }
 
@@ -457,14 +452,14 @@ 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;
 
   switch (action) {
     case Actions::Click:
       // If the first action after fast wakeup is a click, it should be ignored.
-      if (!fastWakeUpDone && state != SystemTaskState::GoingToSleep) {
+      if (!fastWakeUpDone) {
         displayApp.PushMessage(Applications::Display::Messages::ButtonPushed);
       }
       break;
@@ -484,17 +479,10 @@ void SystemTask::HandleButtonAction(Controllers::ButtonActions action) {
   fastWakeUpDone = false;
 }
 
-void SystemTask::GoToRunning() {
-  if (state == SystemTaskState::Sleeping) {
-    state = SystemTaskState::WakingUp;
-    PushMessage(Messages::GoToRunning);
-  }
-}
-
 void SystemTask::OnTouchEvent() {
   if (state == SystemTaskState::Running) {
     PushMessage(Messages::OnTouchEvent);
-  } else if (state == SystemTaskState::Sleeping) {
+  } else {
     if (settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::SingleTap) or
         settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
       PushMessage(Messages::TouchWakeUp);
@@ -503,10 +491,6 @@ void SystemTask::OnTouchEvent() {
 }
 
 void SystemTask::PushMessage(System::Messages msg) {
-  if (msg == Messages::GoToSleep && !doNotGoToSleep) {
-    state = SystemTaskState::GoingToSleep;
-  }
-
   if (in_isr()) {
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
     xQueueSendFromISR(systemTasksMsgQueue, &msg, &xHigherPriorityTaskWoken);

src/systemtask/SystemTask.h

@@ -52,7 +52,7 @@ namespace Pinetime {
   namespace System {
     class SystemTask {
     public:
-      enum class SystemTaskState { Sleeping, Running, GoingToSleep, WakingUp };
+      enum class SystemTaskState { Sleeping, Running, GoingToSleep };
       SystemTask(Drivers::SpiMaster& spi,
                  Pinetime::Drivers::SpiNorFlash& spiNorFlash,
                  Drivers::TwiMaster& twiMaster,
@@ -79,11 +79,8 @@ namespace Pinetime {
 
       void OnTouchEvent();
 
-      void OnIdle();
-      void OnDim();
-
       bool IsSleepDisabled() {
-        return doNotGoToSleep;
+        return wakeLocksHeld > 0;
       }
 
       Pinetime::Controllers::NimbleController& nimble() {
@@ -91,7 +88,7 @@ namespace Pinetime {
       };
 
       bool IsSleeping() const {
-        return state == SystemTaskState::Sleeping || state == SystemTaskState::WakingUp;
+        return state != SystemTaskState::Running;
       }
 
     private:
@@ -127,13 +124,14 @@ namespace Pinetime {
       bool isBleDiscoveryTimerRunning = false;
       uint8_t bleDiscoveryTimer = 0;
       TimerHandle_t measureBatteryTimer;
-      bool doNotGoToSleep = false;
+      uint8_t wakeLocksHeld = 0;
       SystemTaskState state = SystemTaskState::Running;
 
       void HandleButtonAction(Controllers::ButtonActions action);
       bool fastWakeUpDone = false;
 
       void GoToRunning();
+      void GoToSleep();
       void UpdateMotion();
       bool stepCounterMustBeReset = false;
       static constexpr TickType_t batteryMeasurementPeriod = pdMS_TO_TICKS(10 * 60 * 1000);

src/systemtask/WakeLock.cpp

@@ -0,0 +1,27 @@
+#include "systemtask/WakeLock.h"
+
+using namespace Pinetime::System;
+
+WakeLock::WakeLock(SystemTask& systemTask) : systemTask {systemTask} {
+  lockHeld = false;
+}
+
+WakeLock::~WakeLock() {
+  Release();
+}
+
+void WakeLock::Lock() {
+  if (lockHeld) {
+    return;
+  }
+  systemTask.PushMessage(Messages::DisableSleeping);
+  lockHeld = true;
+}
+
+void WakeLock::Release() {
+  if (!lockHeld) {
+    return;
+  }
+  systemTask.PushMessage(Messages::EnableSleeping);
+  lockHeld = false;
+}

src/systemtask/WakeLock.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "systemtask/SystemTask.h"
+
+namespace Pinetime {
+  namespace System {
+    class WakeLock {
+    public:
+      WakeLock(SystemTask& systemTask);
+      ~WakeLock();
+      void Lock();
+      void Release();
+
+    private:
+      bool lockHeld;
+      SystemTask& systemTask;
+    };
+  }
+}