/* Return with the sys. layer. (Same on every screen and it is above the normal screen and the top layer)  */
lv_obj_t* lv_disp_get_layer_sys(lv_disp_t *disp)
/* Return with the sys. layer. (Same on every screen and it is above the normal screen and the top layer)  */
lv_obj_t* lv_disp_get_layer_sys(lv_disp_t *disp)
{
    if(!disp) disp = lv_disp_get_default();
    if(!disp) {
        LV_LOG_WARN("lv_layer_sys: no display registered to get its sys. layer");
        return NULL;
    }
    return disp->sys_layer;
}