add firmware source code (#4)

* add firmware source code

firmware/main/hal/board/hal_bridge.cc

@@ -0,0 +1,134 @@
+/*
+ * SPDX-FileCopyrightText: 2026 M5Stack Technology CO LTD
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#include "hal_bridge.h"
+#include "stackchan_display.h"
+#include <esp_log.h>
+#include <esp_err.h>
+#include <nvs.h>
+#include <nvs_flash.h>
+#include <driver/gpio.h>
+#include <esp_event.h>
+#include <application.h>
+#include <board.h>
+#include <display.h>
+#include <mutex>
+#include <assets.h>
+
+static const char* _tag = "HAL_BRIDGE";
+
+namespace hal_bridge {
+
+/* -------------------------------------------------------------------------- */
+/*                            State and touch point                           */
+/* -------------------------------------------------------------------------- */
+
+static std::mutex _mutex;
+static Data_t _data;
+
+void lock()
+{
+    _mutex.lock();
+}
+
+void unlock()
+{
+    _mutex.unlock();
+}
+
+Data_t& get_data()
+{
+    return _data;
+}
+
+void set_touch_point(int num, int x, int y)
+{
+    std::lock_guard<std::mutex> lock(_mutex);
+    _data.touchPoint.num = num;
+    _data.touchPoint.x   = x;
+    _data.touchPoint.y   = y;
+}
+
+TouchPoint_t get_touch_point()
+{
+    std::lock_guard<std::mutex> lock(_mutex);
+    return _data.touchPoint;
+}
+
+bool is_xiaozhi_mode()
+{
+    std::lock_guard<std::mutex> lock(_mutex);
+    return _data.isXiaozhiMode;
+}
+
+void set_xiaozhi_mode(bool mode)
+{
+    std::lock_guard<std::mutex> lock(_mutex);
+    _data.isXiaozhiMode = mode;
+}
+
+/* -------------------------------------------------------------------------- */
+/*                                   Display                                  */
+/* -------------------------------------------------------------------------- */
+#define DISPLAY_TYPE StackChanAvatarDisplay
+
+lv_disp_t* display_get_lvgl_display()
+{
+    auto display = static_cast<DISPLAY_TYPE*>(Board::GetInstance().GetDisplay());
+    return display->GetLvglDisplay();
+}
+
+void disply_lvgl_lock()
+{
+    auto display = static_cast<DISPLAY_TYPE*>(Board::GetInstance().GetDisplay());
+    display->LvglLock();
+}
+
+void disply_lvgl_unlock()
+{
+    auto display = static_cast<DISPLAY_TYPE*>(Board::GetInstance().GetDisplay());
+    display->LvglUnlock();
+}
+
+void display_setup_xiaozhi_ui()
+{
+    auto display = static_cast<DISPLAY_TYPE*>(Board::GetInstance().GetDisplay());
+    display->SetupXiaoZhiUI();
+}
+
+/* -------------------------------------------------------------------------- */
+/*                                 Application                                */
+/* -------------------------------------------------------------------------- */
+
+void xiaozhi_board_init()
+{
+    // Initialize the default event loop
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+
+    // Init board
+    auto& board = Board::GetInstance();
+
+    // test
+    board.GetBacklight()->SetBrightness(100);
+}
+
+void start_xiaozhi_app()
+{
+    display_setup_xiaozhi_ui();
+
+    set_xiaozhi_mode(true);
+
+    // Launch the application
+    auto& app = Application::GetInstance();
+    app.Start();
+}
+
+void app_play_sound(const std::string_view& sound)
+{
+    auto& app = Application::GetInstance();
+    app.PlaySound(sound);
+}
+
+}  // namespace hal_bridge