[bsp][stm32l475] update lvgl driver

Author: mysterywolf

bsp/stm32/stm32l475-atk-pandora/board/ports/lvgl/lv_port_disp.c

@@ -11,13 +11,14 @@
 #include <drv_lcd.h>
 
 #define MY_DISP_HOR_RES LCD_W
+#define DISP_BUFFER_LINES 10
 
 /*A static or global variable to store the buffers*/
 static lv_disp_draw_buf_t disp_buf;
 
 /*Static or global buffer(s). The second buffer is optional*/
-static lv_color_t buf_1[MY_DISP_HOR_RES * 10];
-static lv_color_t buf_2[MY_DISP_HOR_RES * 10];
+static lv_color_t buf_1[MY_DISP_HOR_RES * DISP_BUFFER_LINES];
+static lv_color_t buf_2[MY_DISP_HOR_RES * DISP_BUFFER_LINES];
 
 static lv_disp_drv_t disp_drv;  /*Descriptor of a display driver*/
 
@@ -26,6 +27,7 @@ static lv_disp_drv_t disp_drv;  /*Descriptor of a display driver*/
  *'lv_disp_flush_ready()' has to be called when finished.*/
 static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
 {
+    /* color_p is a buffer pointer; the buffer is provided by LVGL */
     lcd_fill_array(area->x1, area->y1, area->x2, area->y2, color_p);
 
     /*IMPORTANT!!!
@@ -36,13 +38,13 @@ static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_colo
 void lv_port_disp_init(void)
 {
     /*Initialize `disp_buf` with the buffer(s). With only one buffer use NULL instead buf_2 */
-    lv_disp_draw_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES*10);
+    lv_disp_draw_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES * DISP_BUFFER_LINES);
 
     lv_disp_drv_init(&disp_drv); /*Basic initialization*/
 
     /*Set the resolution of the display*/
-    disp_drv.hor_res = MY_DISP_HOR_RES;
-    disp_drv.ver_res = MY_DISP_HOR_RES;
+    disp_drv.hor_res = LCD_W;
+    disp_drv.ver_res = LCD_H;
 
     /*Set a display buffer*/
     disp_drv.draw_buf = &disp_buf;