Time & date, system events and much more (#152)

## Time & Date
- Added time to statusbar widget
- Added Time & Date Settings app
- Added TimeZone app for selecting TimeZone
- Added `tt::time` namespace with timezone code

## Other changes

- Added `SystemEvent` to publish/subscribe to system wide (e.g. for init code, but also for time settings changes)
- Changed the way the statusbar widget works: now there's only 1 that gets shown/hidden, instead of 1 instance per app instance.
- Moved `lowercase()` function to new namespace: `tt::string`
- Increased T-Deck flash & PSRAM SPI frequencies to 120 MHz (from 80 MHz)
- Temporary work-around (+ TODO item) for LVGL stack size (issue with WiFi app)
- Suppress T-Deck keystroke debugging to debug level (privacy issue)
- Improved SDL dependency wiring in various `CMakeLists.txt`
- `Loader` service had some variables renamed to the newer C++ style (from previous C style)

TactilityHeadless/Source/Assets.h

@@ -14,3 +14,4 @@
 #define TT_ASSETS_APP_ICON_I2C_SETTINGS TT_ASSET("app_icon_i2c.png")
 #define TT_ASSETS_APP_ICON_SETTINGS TT_ASSET("app_icon_settings.png")
 #define TT_ASSETS_APP_ICON_SYSTEM_INFO TT_ASSET("app_icon_system_info.png")
+#define TT_ASSETS_APP_ICON_TIME_DATE_SETTINGS TT_ASSET("app_icon_time_date_settings.png")

TactilityHeadless/Source/TactilityHeadless.cpp

@@ -4,6 +4,9 @@
 #include "hal/Hal_i.h"
 #include "service/ServiceManifest.h"
 #include "service/ServiceRegistry.h"
+#include "kernel/SystemEvents.h"
+#include "network/NtpPrivate.h"
+#include "time/TimePrivate.h"
 
 #ifdef ESP_PLATFORM
 #include "EspInit.h"
@@ -39,7 +42,9 @@ void initHeadless(const hal::Configuration& config) {
     initEsp();
 #endif
     hardwareConfig = &config;
+    time::init();
     hal::init(config);
+    network::ntp::init();
     register_and_start_system_services();
 }
 

TactilityHeadless/Source/hal/Configuration.h

@@ -10,8 +10,6 @@ typedef bool (*InitBoot)();
 typedef bool (*InitHardware)();
 typedef bool (*InitLvgl)();
 
-typedef void (*SetBacklightDuty)(uint8_t);
-
 class Display;
 class Keyboard;
 typedef Display* (*CreateDisplay)();
@@ -57,7 +55,7 @@ struct Configuration {
     const CreatePower _Nullable power = nullptr;
 
     /**
-     * A list of i2c devices (can be empty, but preferably accurately represents the device capabilities)
+     * A list of i2c interfaces
      */
     const std::vector<i2c::Configuration> i2c = {};
 };

TactilityHeadless/Source/hal/Hal.cpp

@@ -1,16 +1,21 @@
 #include "hal/Hal_i.h"
 #include "hal/i2c/I2c.h"
+#include "kernel/SystemEvents.h"
 
 #define TAG "hal"
 
 namespace tt::hal {
 
 void init(const Configuration& configuration) {
+    kernel::systemEventPublish(kernel::SystemEvent::BootInitHalBegin);
+
+    kernel::systemEventPublish(kernel::SystemEvent::BootInitI2cBegin);
     tt_check(i2c::init(configuration.i2c), "I2C init failed");
     if (configuration.initHardware != nullptr) {
         TT_LOG_I(TAG, "Init hardware");
         tt_check(configuration.initHardware(), "Hardware init failed");
     }
+    kernel::systemEventPublish(kernel::SystemEvent::BootInitI2cEnd);
 
     if (configuration.initBoot != nullptr) {
         TT_LOG_I(TAG, "Init power");
@@ -23,6 +28,8 @@ void init(const Configuration& configuration) {
             TT_LOG_W(TAG, "SD card mount failed (init can continue)");
         }
     }
+
+    kernel::systemEventPublish(kernel::SystemEvent::BootInitHalEnd);
 }
 
 } // namespace

TactilityHeadless/Source/kernel/SystemEvents.cpp

@@ -0,0 +1,87 @@
+#include "SystemEvents.h"
+#include "Mutex.h"
+#include "CoreExtraDefines.h"
+#include <list>
+
+#define TAG "system_event"
+
+namespace tt::kernel {
+
+struct SubscriptionData {
+    SystemEventSubscription id;
+    SystemEvent event;
+    OnSystemEvent handler;
+};
+
+static Mutex mutex;
+static SystemEventSubscription subscriptionCounter = 0;
+static std::list<SubscriptionData> subscriptions;
+
+static const char* getEventName(SystemEvent event) {
+    switch (event) {
+        case SystemEvent::BootInitHalBegin:
+            return TT_STRINGIFY(SystemEvent::BootInitHalBegin);
+        case SystemEvent::BootInitHalEnd:
+            return TT_STRINGIFY(SystemEvent::BootInitHalEnd);
+        case SystemEvent::BootInitI2cBegin:
+            return TT_STRINGIFY(SystemEvent::BootInitI2cBegin);
+        case SystemEvent::BootInitI2cEnd:
+            return TT_STRINGIFY(SystemEvent::BootInitI2cEnd);
+        case SystemEvent::BootInitLvglBegin:
+            return TT_STRINGIFY(SystemEvent::BootInitLvglBegin);
+        case SystemEvent::BootInitLvglEnd:
+            return TT_STRINGIFY(SystemEvent::BootInitLvglEnd);
+        case SystemEvent::BootSplash:
+            return TT_STRINGIFY(SystemEvent::BootSplash);
+        case SystemEvent::NetworkConnected:
+            return TT_STRINGIFY(SystemEvent::NetworkConnected);
+        case SystemEvent::NetworkDisconnected:
+            return TT_STRINGIFY(SystemEvent::NetworkDisconnected);
+        case SystemEvent::Time:
+            return TT_STRINGIFY(SystemEvent::Time);
+    }
+
+    tt_crash(); // Missing case above
+}
+
+void systemEventPublish(SystemEvent event) {
+    TT_LOG_I(TAG, "%s", getEventName(event));
+
+    if (mutex.lock(portMAX_DELAY)) {
+        for (auto& subscription : subscriptions) {
+            if (subscription.event == event) {
+                subscription.handler(event);
+            }
+        }
+
+        mutex.unlock();
+    }
+}
+
+SystemEventSubscription systemEventAddListener(SystemEvent event, OnSystemEvent handler) {
+    if (mutex.lock(portMAX_DELAY)) {
+        auto id = ++subscriptionCounter;
+
+        subscriptions.push_back({
+            .id = id,
+            .event = event,
+            .handler = handler
+        });
+
+        mutex.unlock();
+        return id;
+    } else {
+        tt_crash();
+    }
+}
+
+void systemEventRemoveListener(SystemEventSubscription subscription) {
+    if (mutex.lock(portMAX_DELAY)) {
+        std::erase_if(subscriptions, [subscription](auto& item) {
+            return (item.id == subscription);
+        });
+        mutex.unlock();
+    }
+}
+
+}

TactilityHeadless/Source/kernel/SystemEvents.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <cstdint>
+
+namespace tt::kernel {
+
+enum class SystemEvent {
+    BootInitHalBegin,
+    BootInitHalEnd,
+    BootInitI2cBegin,
+    BootInitI2cEnd,
+    BootInitLvglBegin,
+    BootInitLvglEnd,
+    BootSplash,
+    /** Gained IP address */
+    NetworkConnected,
+    NetworkDisconnected,
+    /** An important system time-related event, such as NTP update or time-zone change */
+    Time,
+};
+
+/** Value 0 mean "no subscription" */
+typedef uint32_t SystemEventSubscription;
+
+typedef void (*OnSystemEvent)(SystemEvent event);
+
+void systemEventPublish(SystemEvent event);
+SystemEventSubscription systemEventAddListener(SystemEvent event, OnSystemEvent handler);
+void systemEventRemoveListener(SystemEventSubscription subscription);
+
+}

TactilityHeadless/Source/network/Ntp.cpp

@@ -0,0 +1,34 @@
+#include "network/NtpPrivate.h"
+
+#ifdef ESP_PLATFORM
+#include "kernel/SystemEvents.h"
+#include "TactilityCore.h"
+#include <esp_netif_sntp.h>
+#include <esp_sntp.h>
+#endif
+
+#define TAG "ntp"
+
+namespace tt::network::ntp {
+
+#ifdef ESP_PLATFORM
+
+static void onTimeSynced(struct timeval* tv) {
+    TT_LOG_I(TAG, "Time synced (%llu)", tv->tv_sec);
+    kernel::systemEventPublish(kernel::SystemEvent::Time);
+}
+
+void init() {
+    esp_sntp_config_t config = ESP_NETIF_SNTP_DEFAULT_CONFIG("pool.ntp.org");
+    config.sync_cb = onTimeSynced;
+    esp_netif_sntp_init(&config);
+}
+
+#else
+
+void init() {
+}
+
+#endif
+
+}

TactilityHeadless/Source/time/Time.cpp

@@ -0,0 +1,101 @@
+#include <ctime>
+#include "Time.h"
+#include "Preferences.h"
+#include "kernel/SystemEvents.h"
+
+namespace tt::time {
+
+#ifdef ESP_PLATFORM
+
+#define TIME_SETTINGS_NAMESPACE "time"
+
+#define TIMEZONE_PREFERENCES_KEY_NAME "tz_name"
+#define TIMEZONE_PREFERENCES_KEY_CODE "tz_code"
+#define TIMEZONE_PREFERENCES_KEY_TIME24 "tz_time24"
+
+void init() {
+    auto code= getTimeZoneCode();
+    if (!code.empty()) {
+        setenv("TZ", code.c_str(), 1);
+        tzset();
+    }
+}
+
+void setTimeZone(const std::string& name, const std::string& code) {
+    Preferences preferences(TIME_SETTINGS_NAMESPACE);
+    preferences.putString(TIMEZONE_PREFERENCES_KEY_NAME, name);
+    preferences.putString(TIMEZONE_PREFERENCES_KEY_CODE, code);
+
+    setenv("TZ", code.c_str(), 1);
+    tzset();
+
+    kernel::systemEventPublish(kernel::SystemEvent::Time);
+}
+
+std::string getTimeZoneName() {
+    Preferences preferences(TIME_SETTINGS_NAMESPACE);
+    std::string result;
+    if (preferences.optString(TIMEZONE_PREFERENCES_KEY_NAME, result)) {
+        return result;
+    } else {
+        return {};
+    }
+}
+
+std::string getTimeZoneCode() {
+    Preferences preferences(TIME_SETTINGS_NAMESPACE);
+    std::string result;
+    if (preferences.optString(TIMEZONE_PREFERENCES_KEY_CODE, result)) {
+        return result;
+    } else {
+        return {};
+    }
+}
+
+bool isTimeFormat24Hour() {
+    Preferences preferences(TIME_SETTINGS_NAMESPACE);
+    bool show24Hour = true;
+    preferences.optBool(TIMEZONE_PREFERENCES_KEY_TIME24, show24Hour);
+    return show24Hour;
+}
+
+void setTimeFormat24Hour(bool show24Hour) {
+    Preferences preferences(TIME_SETTINGS_NAMESPACE);
+    preferences.putBool(TIMEZONE_PREFERENCES_KEY_TIME24, show24Hour);
+    kernel::systemEventPublish(kernel::SystemEvent::Time);
+}
+
+#else
+
+static std::string timeZoneName;
+static std::string timeZoneCode;
+static bool show24Hour = true;
+
+void init() {}
+
+void setTimeZone(const std::string& name, const std::string& code) {
+    timeZoneName = name;
+    timeZoneCode = code;
+    kernel::systemEventPublish(kernel::SystemEvent::Time);
+}
+
+std::string getTimeZoneName() {
+    return timeZoneName;
+}
+
+std::string getTimeZoneCode() {
+    return timeZoneCode;
+}
+
+bool isTimeFormat24Hour() {
+    return show24Hour;
+}
+
+void setTimeFormat24Hour(bool enabled) {
+    show24Hour = enabled;
+    kernel::systemEventPublish(kernel::SystemEvent::Time);
+}
+
+#endif
+
+}

TactilityHeadless/Source/time/Time.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <string>
+
+namespace tt::time {
+
+/**
+ * Set the timezone
+ * @param[in] name human-readable name
+ * @param[in] code the technical code (from timezones.csv)
+ */
+void setTimeZone(const std::string& name, const std::string& code);
+
+/**
+ * Get the name of the timezone
+ */
+std::string getTimeZoneName();
+
+/**
+ * Get the code of the timezone (see timezones.csv)
+ */
+std::string getTimeZoneCode();
+
+/** @return true when clocks should be shown as a 24 hours one instead of 12 hours */
+bool isTimeFormat24Hour();
+
+/** Set whether clocks should be shown as a 24 hours instead of 12 hours
+ * @param[in] show24Hour
+ */
+void setTimeFormat24Hour(bool show24Hour);
+
+}