这是一次长久的提交：

1. 应用界面增加了返回主页的按钮
2. 修复了gif渲染内存泄漏的严重bug
3. 将PetDao当中的cJSON API替换为cpp_json，完美通过测试
4. 整合已经实现的各种上层建筑，实现了一个宠物对话基本业务应用，用于样品测试展示用
5. 重构了音频播放类，使其更modern，更加便于移植和拓展

Lib/Display/LVGL_Driver/LVGL_Driver.c

@@ -18,13 +18,12 @@ void example_increase_lvgl_tick(void *arg)
 void example_lvgl_flush_cb(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map)
 {
     esp_lcd_panel_handle_t panel_handle = (esp_lcd_panel_handle_t) drv->user_data;
-    int offsetx1 = area->x1;
-    int offsetx2 = area->x2;
-    int offsety1 = area->y1;
-    int offsety2 = area->y2;
-    // copy a buffer's content to a specific area of the display
-    esp_lcd_panel_draw_bitmap(panel_handle, offsetx1, offsety1, offsetx2 +1, offsety2 + 1, color_map);
+    // 立即通知LVGL传输开始，使用DMA传输
     lv_disp_flush_ready(drv);
+
+    // copy a buffer's content to a specific area of the display
+    // 异步传输数据
+    esp_lcd_panel_draw_bitmap(panel_handle, area->x1, area->y1, area->x2 + 1, area->y2 + 1, color_map);
 }
 
 /*Read the touchpad*/
@@ -89,7 +88,7 @@ void LVGL_Init(void)
     
     lv_color_t *buf1 = heap_caps_malloc(LVGL_BUF_LEN * sizeof(lv_color_t), MALLOC_CAP_SPIRAM);
     assert(buf1);
-    lv_color_t *buf2 = heap_caps_malloc(LVGL_BUF_LEN * sizeof(lv_color_t) , MALLOC_CAP_SPIRAM);    
+    lv_color_t *buf2 = heap_caps_malloc(LVGL_BUF_LEN * sizeof(lv_color_t) , MALLOC_CAP_SPIRAM);
     assert(buf2);
     lv_disp_draw_buf_init(&disp_buf, buf1, buf2, LVGL_BUF_LEN);                              // initialize LVGL draw buffers
 
@@ -119,7 +118,7 @@ void LVGL_Init(void)
         .callback = &example_increase_lvgl_tick,
         .name = "lvgl_tick"
     };
-    
+
     esp_timer_handle_t lvgl_tick_timer = NULL;
     ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
     ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer, EXAMPLE_LVGL_TICK_PERIOD_MS * 1000));

Lib/Display/LVGL_Driver/LVGL_Driver.h

@@ -15,7 +15,7 @@ extern "C" {
 
 
 
-#define LVGL_BUF_LEN  (EXAMPLE_LCD_WIDTH * EXAMPLE_LCD_HEIGHT / 20)
+#define LVGL_BUF_LEN  (EXAMPLE_LCD_WIDTH * EXAMPLE_LCD_HEIGHT / 8)      // 1 byte per pixel
 #define EXAMPLE_LVGL_TICK_PERIOD_MS    2
 
 extern lv_disp_draw_buf_t disp_buf;                                                 // contains internal graphic buffer(s) called draw buffer(s)