Alarm persist to flash (#1367)

* AlarmController: Add saving alarm time to file

Save the set alarm time to the SPI NOR flash, so it does not reset to
the default value when the watch resets, e.g. due to watchdog timeout
or reflashing of a new version of InfiniTime.

Just like the `Settings.h` `LoadSettingsFromFile()` the previous alarm
at boot (if available) and `SaveSettingsToFile()` the current alarm when
the `Alarm.h` screen is closed (only if the settings have changed).

The alarm-settings file is stored in `.system/alarm.dat`. The `.system`
folder is created if it doesn't yet exist.

Fixes: https://github.com/InfiniTimeOrg/InfiniTime/issues/1330

* alarmController: close .system dir after usage

Close the `lfs_dir` object for the `.system` dir after usage. Otherwise
on the second changed alarm the system will lockup because the `.system`
dir is already open and was never closed.

---------

Co-authored-by: Galdor Takacs <g@ldor.de>

1 files changed, 32 insertions, 14 deletions

diff --git a/src/components/alarm/AlarmController.h b/src/components/alarm/AlarmController.h
index 8ac0de9a..278e9cdb 100644
--- a/src/components/alarm/AlarmController.h
+++ b/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;
       }
 
-      RecurType Recurrence() const {
-        return recurrence;
+      bool IsEnabled() const {
+        return alarm.isEnabled;
       }
 
-      void SetRecurrence(RecurType recurType) {
-        recurrence = recurType;
+      RecurType Recurrence() const {
+        return alarm.recurrence;
       }
 
+      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;
     };
   }
 }