初始提交卡包 USB 工程

纳入固件源码、屏幕组件、nand_xfer 工具和文档。忽略本机构建产物、sdkconfig，以及含本机路径的依赖锁。

Co-authored-by: Cursor <[email protected]>

main/ui_cmd.h

@@ -0,0 +1,48 @@
+#ifndef UI_CMD_H
+#define UI_CMD_H
+
+#include <stddef.h>
+
+#include "lvgl.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/queue.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum
+{
+    UI_CMD_NONE = 0,
+    UI_CMD_SET_LABEL_TEXT,
+    UI_CMD_SET_IMAGE_SRC,
+    UI_CMD_WEATHER_FORECAST_TIME_REFRESH,
+} ui_cmd_type_t;
+
+typedef struct
+{
+    ui_cmd_type_t type;
+    lv_obj_t *obj;
+    union
+    {
+        char text[128];
+        const void *img_src;
+    } u;
+} ui_cmd_t;
+
+void ui_cmd_init(void);
+BaseType_t ui_cmd_set_label_text(lv_obj_t *obj, const char *text);
+BaseType_t ui_cmd_set_image_src(lv_obj_t *obj, const void *src);
+BaseType_t ui_cmd_weather_forecast_time_refresh(void);
+
+/**
+ * Drain and execute all pending UI commands.
+ * Must be called from the LVGL task context while it is safe to call LVGL.
+ */
+void ui_cmd_drain(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // UI_CMD_H