diff --git a/lv_conf_templ.h b/lv_conf_templ.h
index 9fae5edfa..eb9b30108 100644
--- a/lv_conf_templ.h
+++ b/lv_conf_templ.h
@@ -31,12 +31,14 @@
 #define LV_VER_RES          (480 << LV_ANTIALIAS)
 #define LV_DPI              (100 << LV_ANTIALIAS)
 
-/* Buffered rendering: >= LV_DOWNSCALE * LV_HOR_RES or 0 to disable buffering*/
-#define LV_VDB_SIZE         (40 * LV_VER_RES)
+/* Buffered rendering: >= LV_HOR_RES or 0 to disable buffering*/
+#define LV_VDB_SIZE         (40 * LV_HOR_RES)
+#define LV_VDB_ADR			0		/*Place VDB to a specific address (e.g. in external RAM) (0: allocate into RAM)*/
 
 /* Use two Virtual Display buffers (VDB) parallelize rendering and flushing
  * The flushing should use DMA to write the frame buffer in the background*/
-#define LV_VDB_DOUBLE       0
+#define LV_VDB_DOUBLE		0
+#define LV_VDB2_ADR			0		/*Place VDB2 to a specific address (e.g. in external RAM) (0: allocate into RAM)*/
 
 /* Enable anti aliasing
  * If enabled everything will be rendered in double size and filtered to normal size */
@@ -44,7 +46,7 @@
 
 /* Enable anti aliasing only for fonts (texts)
  * It half the size of the letters so you should use double sized fonts
- * Much faster then normal anti aliasing  */
+ * Much faster then normal anti aliasing (don't use together with LV_ANTIALIAS) */
 #define LV_FONT_ANTIALIAS   1
 
 /*=================
diff --git a/lv_hal/lv_hal_tick.c b/lv_hal/lv_hal_tick.c
index 6d5e23e75..44576f31d 100644
--- a/lv_hal/lv_hal_tick.c
+++ b/lv_hal/lv_hal_tick.c
@@ -42,7 +42,7 @@ static volatile uint8_t tick_irq_flag;
 void lv_tick_inc(uint32_t tick_period)
 {
     tick_irq_flag = 0;
-    sys_time++;
+    sys_time += tick_period;
 }
 
 /**
diff --git a/lv_obj/lv_vdb.c b/lv_obj/lv_vdb.c
index d65328787..77adfdc72 100644
--- a/lv_obj/lv_vdb.c
+++ b/lv_obj/lv_vdb.c
@@ -33,12 +33,31 @@ typedef enum {
 /**********************
  *  STATIC VARIABLES
  **********************/
+
+
 #if LV_VDB_DOUBLE == 0
-static lv_vdb_t vdb;
-static volatile lv_vdb_state_t vdb_state = LV_VDB_STATE_ACTIVE;
+   /*Simple VDB*/
+   static volatile lv_vdb_state_t vdb_state = LV_VDB_STATE_ACTIVE;
+#  if LV_VDB_ADR == 0
+     /*If the buffer address is not specified  simply allocate it*/
+     static lv_color_t vdb_buf[LV_VDB_SIZE];
+     static lv_vdb_t vdb = {.buf = vdb_buf};
+#  else
+     /*If the buffer address is specified use that address*/
+     static lv_vdb_t vdb = {.buf = (lv_color_t *)LV_VDB_ADR};
+#  endif
 #else
-static lv_vdb_t vdb[2];
-static volatile lv_vdb_state_t vdb_state[2] = {LV_VDB_STATE_FREE, LV_VDB_STATE_FREE};
+   /*Double VDB*/
+   static volatile lv_vdb_state_t vdb_state[2] = {LV_VDB_STATE_FREE, LV_VDB_STATE_FREE};
+#  if LV_VDB_ADR == 0
+   /*If the buffer address is not specified  simply allocate it*/
+   static lv_color_t vdb_buf1[LV_VDB_SIZE];
+   static lv_color_t vdb_buf2[LV_VDB_SIZE];
+   static lv_vdb_t vdb[2] = {{.buf = vdb_buf1}, {.buf = vdb_buf2}};
+#  else
+   /*If the buffer address is specified use that address*/
+   static lv_vdb_t vdb[2] = {{.buf = (lv_color_t *)LV_VDB_ADR}, {.buf = (lv_color_t *)LV_VDB2_ADR}};
+#  endif
 #endif
 
 /**********************
diff --git a/lv_obj/lv_vdb.h b/lv_obj/lv_vdb.h
index 36c45facb..9cb6f1ac2 100644
--- a/lv_obj/lv_vdb.h
+++ b/lv_obj/lv_vdb.h
@@ -31,7 +31,7 @@ extern "C" {
 typedef struct
 {
     lv_area_t area;
-    lv_color_t buf[LV_VDB_SIZE];
+    lv_color_t *buf;
 }lv_vdb_t;
 
 /**********************