LVGL init improved, add start/stop mechanism. Improved system events for LVGL.

Tactility/Include/Tactility/kernel/SystemEvents.h

@@ -14,12 +14,14 @@ enum class SystemEvent {
     BootInitSpiEnd,
     BootInitUartBegin,
     BootInitUartEnd,
-    BootInitLvglBegin,
-    BootInitLvglEnd,
     BootSplash,
     /** Gained IP address */
     NetworkConnected,
     NetworkDisconnected,
+    /** LVGL devices are initialized and usable */
+    LvglStarted,
+    /** LVGL devices were removed and not usable anymore */
+    LvglStopped,
     /** An important system time-related event, such as NTP update or time-zone change */
     Time,
 };

Tactility/Include/Tactility/lvgl/Lvgl.h

@@ -1,9 +1,11 @@
 #pragma once
 
-#include <lvgl.h>
+namespace tt::lvgl {
 
-#include "./Colors.h"
+bool isStarted();
 
-void startLvgl();
+void start();
 
-void stopLvgl();
+void stop();
+
+}

Tactility/Include/Tactility/service/ServiceRegistry.h

@@ -30,11 +30,11 @@ bool startService(const std::string& id);
 bool stopService(const std::string& id);
 
 /** Get the state of a service.
+ * @warning If the service is not found, the returned result will be "Stopped" - even if the service id does not exist
  * @param[in] the service id as defined in its manifest
- * @param[out] the variable to store the resulting state in
- * @return true if the service was found and "state" was set
+ * @return the service state
  */
-bool getState(const std::string& id, State& state);
+State getState(const std::string& id);
 
 /** Find a service manifest by its id.
  * @param[in] id the id as defined in the manifest

Tactility/Source/Tactility.cpp

@@ -1,7 +1,7 @@
 #include "Tactility/Tactility.h"
 
 #include "Tactility/app/ManifestRegistry.h"
-#include "Tactility/lvgl/Init_i.h"
+#include "Tactility/lvgl/LvglPrivate.h"
 #include "Tactility/service/ServiceManifest.h"
 
 #include <Tactility/TactilityHeadless.h>

Tactility/Source/kernel/SystemEvents.cpp

@@ -38,16 +38,16 @@ static const char* getEventName(SystemEvent event) {
             return TT_STRINGIFY(BootInitUartBegin);
         case BootInitUartEnd:
             return TT_STRINGIFY(BootInitUartEnd);
-        case BootInitLvglBegin:
-            return TT_STRINGIFY(BootInitLvglBegin);
-        case BootInitLvglEnd:
-            return TT_STRINGIFY(BootInitLvglEnd);
         case BootSplash:
             return TT_STRINGIFY(BootSplash);
         case NetworkConnected:
             return TT_STRINGIFY(NetworkConnected);
         case NetworkDisconnected:
             return TT_STRINGIFY(NetworkDisconnected);
+        case LvglStarted:
+            return TT_STRINGIFY(LvglStarted);
+        case LvglStopped:
+            return TT_STRINGIFY(LvglStopped);
         case Time:
             return TT_STRINGIFY(Time);
     }

Tactility/Source/lvgl/Init.cpp

@@ -1,102 +0,0 @@
-#include "Tactility/app/display/DisplaySettings.h"
-#include "Tactility/lvgl/Keyboard.h"
-
-#include "Tactility/hal/display/DisplayDevice.h"
-#include "Tactility/hal/touch/TouchDevice.h"
-#include <Tactility/hal/Configuration.h>
-#include <Tactility/hal/keyboard/KeyboardDevice.h>
-#include <Tactility/kernel/SystemEvents.h>
-
-#ifdef ESP_PLATFORM
-#include "Tactility/lvgl/EspLvglPort.h"
-#endif
-
-#include <lvgl.h>
-
-namespace tt::lvgl {
-
-#define TAG "lvgl_init"
-
-static std::shared_ptr<hal::display::DisplayDevice> initDisplay(const hal::Configuration& config) {
-    assert(config.createDisplay);
-    auto display = config.createDisplay();
-    assert(display != nullptr);
-
-    if (!display->start()) {
-        TT_LOG_E(TAG, "Display start failed");
-        return nullptr;
-    }
-
-    if (display->supportsBacklightDuty()) {
-        display->setBacklightDuty(0);
-    }
-
-    if (display->supportsLvgl() && display->startLvgl()) {
-        auto lvgl_display = display->getLvglDisplay();
-        assert(lvgl_display != nullptr);
-        lv_display_rotation_t rotation = app::display::getRotation();
-        if (rotation != lv_display_get_rotation(lvgl_display)) {
-            lv_display_set_rotation(lvgl_display, rotation);
-        }
-    }
-
-    return display;
-}
-
-static bool initKeyboard(const std::shared_ptr<hal::display::DisplayDevice>& display, const std::shared_ptr<hal::keyboard::KeyboardDevice>& keyboard) {
-    TT_LOG_I(TAG, "Keyboard init");
-    assert(display);
-    assert(keyboard);
-    if (keyboard->isAttached()) {
-        if (keyboard->start(display->getLvglDisplay())) {
-            lv_indev_t* keyboard_indev = keyboard->getLvglIndev();
-            lv_indev_set_user_data(keyboard_indev, keyboard.get());
-            hardware_keyboard_set_indev(keyboard_indev);
-            TT_LOG_I(TAG, "Keyboard started");
-            return true;
-        } else {
-            TT_LOG_E(TAG, "Keyboard start failed");
-            return false;
-        }
-    } else {
-        TT_LOG_E(TAG, "Keyboard attach failed");
-        return false;
-    }
-}
-
-void init(const hal::Configuration& config) {
-    TT_LOG_I(TAG, "Starting");
-
-    kernel::publishSystemEvent(kernel::SystemEvent::BootInitLvglBegin);
-
-#ifdef ESP_PLATFORM
-    if (config.lvglInit == hal::LvglInit::Default && !initEspLvglPort()) {
-        return;
-    }
-#endif
-
-    auto display = initDisplay(config);
-    if (display == nullptr) {
-        return;
-    }
-    hal::registerDevice(display);
-
-    auto touch = display->getTouchDevice();
-    if (touch != nullptr) {
-        hal::registerDevice(touch);
-    }
-
-    if (config.createKeyboard) {
-        auto keyboard = config.createKeyboard();
-        if (keyboard != nullptr) {
-            hal::registerDevice(keyboard);
-            initKeyboard(display, keyboard);
-        }
-    }
-
-    TT_LOG_I(TAG, "Finished");
-
-    kernel::publishSystemEvent(kernel::SystemEvent::BootInitLvglEnd);
-}
-
-} // namespace

Tactility/Source/lvgl/Lvgl.cpp

@@ -0,0 +1,188 @@
+#include "Tactility/app/display/DisplaySettings.h"
+#include "Tactility/lvgl/Keyboard.h"
+#include "Tactility/lvgl/Lvgl.h"
+
+#include "Tactility/hal/display/DisplayDevice.h"
+#include "Tactility/hal/touch/TouchDevice.h"
+#include <Tactility/hal/Configuration.h>
+#include <Tactility/hal/keyboard/KeyboardDevice.h>
+#include <Tactility/kernel/SystemEvents.h>
+
+#ifdef ESP_PLATFORM
+#include "Tactility/lvgl/EspLvglPort.h"
+#endif
+
+#include <lvgl.h>
+#include <Tactility/Tactility.h>
+#include <Tactility/TactilityHeadless.h>
+#include <Tactility/service/ServiceRegistry.h>
+
+namespace tt::lvgl {
+
+#define TAG "Lvgl"
+
+static bool started = false;
+
+static std::shared_ptr<hal::display::DisplayDevice> createDisplay(const hal::Configuration& config) {
+    assert(config.createDisplay);
+    auto display = config.createDisplay();
+    assert(display != nullptr);
+
+    if (!display->start()) {
+        TT_LOG_E(TAG, "Display start failed");
+        return nullptr;
+    }
+
+    if (display->supportsBacklightDuty()) {
+        display->setBacklightDuty(0);
+    }
+
+    return display;
+}
+
+static bool startKeyboard(const std::shared_ptr<hal::display::DisplayDevice>& display, const std::shared_ptr<hal::keyboard::KeyboardDevice>& keyboard) {
+    TT_LOG_I(TAG, "Keyboard init");
+    assert(display);
+    assert(keyboard);
+    if (keyboard->isAttached()) {
+        if (keyboard->start(display->getLvglDisplay())) {
+            lv_indev_t* keyboard_indev = keyboard->getLvglIndev();
+            hardware_keyboard_set_indev(keyboard_indev);
+            TT_LOG_I(TAG, "Keyboard started");
+            return true;
+        } else {
+            TT_LOG_E(TAG, "Keyboard start failed");
+            return false;
+        }
+    } else {
+        TT_LOG_E(TAG, "Keyboard attach failed");
+        return false;
+    }
+}
+
+void init(const hal::Configuration& config) {
+    TT_LOG_I(TAG, "Init started");
+
+#ifdef ESP_PLATFORM
+    if (config.lvglInit == hal::LvglInit::Default && !initEspLvglPort()) {
+        return;
+    }
+#endif
+
+    auto display = createDisplay(config);
+    if (display == nullptr) {
+        return;
+    }
+    hal::registerDevice(display);
+
+    auto touch = display->getTouchDevice();
+    if (touch != nullptr) {
+        hal::registerDevice(touch);
+    }
+
+    auto configuration = hal::getConfiguration();
+    if (configuration->createKeyboard) {
+        auto keyboard = configuration->createKeyboard();
+        if (keyboard != nullptr) {
+            hal::registerDevice(keyboard);
+        }
+    }
+
+    start();
+
+    TT_LOG_I(TAG, "Init finished");
+}
+
+bool isStarted() {
+    return started;
+}
+
+void start() {
+    TT_LOG_I(TAG, "Start LVGL");
+
+    if (started) {
+        TT_LOG_W(TAG, "Can't start LVGL twice");
+        return;
+    }
+
+    // Start displays (their related touch devices start automatically within)
+
+    auto displays = hal::findDevices<hal::display::DisplayDevice>(hal::Device::Type::Display);
+    for (auto display : displays) {
+        if (display->supportsLvgl() && display->startLvgl()) {
+            auto lvgl_display = display->getLvglDisplay();
+            assert(lvgl_display != nullptr);
+            lv_display_rotation_t rotation = app::display::getRotation();
+            if (rotation != lv_display_get_rotation(lvgl_display)) {
+                lv_display_set_rotation(lvgl_display, rotation);
+            }
+        }
+    }
+
+    // Start keyboards
+
+    auto keyboards = hal::findDevices<hal::keyboard::KeyboardDevice>(hal::Device::Type::Keyboard);
+    for (auto keyboard : keyboards) {
+        if (displays.size() > 0) {
+            // TODO: Consider implementing support for multiple displays
+            auto display = displays[0];
+            startKeyboard(display, keyboard);
+        }
+    }
+
+    // Restart services
+
+    if (service::getState("Gui") == service::State::Stopped) {
+        service::startService("Gui");
+    } else {
+        TT_LOG_E(TAG, "Gui service is not in Stopped state");
+    }
+
+    if (service::getState("Statusbar") == service::State::Stopped) {
+        service::startService("Statusbar");
+    } else {
+        TT_LOG_E(TAG, "Statusbar service is not in Stopped state");
+    }
+
+    // Finalize
+
+    kernel::publishSystemEvent(kernel::SystemEvent::LvglStarted);
+
+    started = true;
+}
+
+void stop() {
+    TT_LOG_I(TAG, "Stop LVGL");
+
+    if (!started) {
+        TT_LOG_W(TAG, "Can't stop LVGL: not started");
+        return;
+    }
+
+    // Stop services that highly depend on LVGL
+
+    service::stopService("Statusbar");
+    service::stopService("Gui");
+
+    // Stop keyboards
+
+    auto keyboards = hal::findDevices<hal::keyboard::KeyboardDevice>(hal::Device::Type::Keyboard);
+    for (auto keyboard : keyboards) {
+        keyboard->stop();
+    }
+
+    // Stop displays (and their touch devices)
+
+    auto displays = hal::findDevices<hal::display::DisplayDevice>(hal::Device::Type::Display);
+    for (auto display : displays) {
+        if (display->supportsLvgl() && display->getLvglDisplay() != nullptr && !display->stopLvgl()) {
+            TT_LOG_E("HelloWorld", "Failed to detach display from LVGL");
+        }
+    }
+
+    started = false;
+
+    kernel::publishSystemEvent(kernel::SystemEvent::LvglStopped);
+}
+
+} // namespace

Tactility/Source/service/ServiceRegistry.cpp

@@ -7,6 +7,7 @@
 
 #include <string>
 #include <unordered_map>
+#include <Tactility/app/AppInstance.h>
 
 namespace tt::service {
 
@@ -98,7 +99,7 @@ bool stopService(const std::string& id) {
     TT_LOG_I(TAG, "Stopping %s", id.c_str());
     auto service_instance = findServiceInstanceById(id);
     if (service_instance == nullptr) {
-        TT_LOG_W(TAG, "service not running: %s", id.c_str());
+        TT_LOG_W(TAG, "Service not running: %s", id.c_str());
         return false;
     }
 
@@ -119,15 +120,12 @@ bool stopService(const std::string& id) {
     return true;
 }
 
-bool getState(const std::string& id, State& state) {
+State getState(const std::string& id) {
     auto service_instance = findServiceInstanceById(id);
     if (service_instance == nullptr) {
-        TT_LOG_W(TAG, "service not running: %s", id.c_str());
-        return false;
-    } else {
-        state = service_instance->getState();
-        return true;
+        return State::Stopped;
     }
+    return service_instance->getState();
 }
 
 } // namespace

Tactility/Source/service/gui/GuiService.cpp

@@ -32,16 +32,11 @@ void GuiService::onLoaderMessage(const void* message, TT_UNUSED void* context) {
 }
 
 int32_t GuiService::guiMain() {
-    State service_state;
     while (true) {
         uint32_t flags = Thread::awaitFlags(GUI_THREAD_FLAG_ALL, EventFlag::WaitAny, (uint32_t)portMAX_DELAY);
 
-        // When service (state) not found -> exit
-        if (!getState(manifest.id, service_state)) {
-            break;
-        }
-
         // When service not started or starting -> exit
+        State service_state = getState(manifest.id);
         if (service_state != State::Started && service_state != State::Starting) {
             break;
         }