A blurred screen problem

Hello. I downloaded an example from the latest official document, which is an example of dynamic display of arcs. Once it runs, it will display a blurred screen, but it can run a static display example. I don’t know where the problem is.This is runned example:
#include “lvgl/lvgl.h”

  • An lv_task to call periodically to set the angles of the arc
  • @param t
    static void arc_loader(lv_task_t * t)
    static int16_t a = 0;
    if(a >= 359) a = 359;
    if(a < 180) lv_arc_set_angles(t->user_data, 180-a ,180);
    else lv_arc_set_angles(t->user_data, 540-a ,180);
    if(a == 359) {
  • Create an arc which acts as a loader.
    void lv_ex_arc_2(void)
    /Create style for the Arcs/
    static lv_style_t style;
    lv_style_copy(&style, &lv_style_plain);
    style.line.color = LV_COLOR_NAVY; /Arc color/
    style.line.width = 8; /Arc width/
    /Create an Arc/
    lv_obj_t * arc = lv_arc_create(lv_scr_act(), NULL);
    lv_arc_set_angles(arc, 180, 180);
    lv_arc_set_style(arc, LV_ARC_STYLE_MAIN, &style);
    lv_obj_align(arc, NULL, LV_ALIGN_CENTER, 0, 0);
    Create an lv_task to update the arc.
  • Store the arc in the user data*/
    lv_task_create(arc_loader, 20, LV_TASK_PRIO_LOWEST, arc);

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Hello. I found out yesterday that the problem was in my driver. Now it’s working properly. Thank you!:smile: