flicker

#include <Arduino.h>
#define LV_COLOR_16_SWAP 0
#include <TFT_eSPI.h>
#include <lvgl.h>

// Display & LVGL setup
TFT_eSPI tft = TFT_eSPI();
static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[LV_HOR_RES_MAX * 10];
lv_obj_t *table;

// LVGL Display Flush Callback
void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p) {
  uint16_t w = area->x2 - area->x1 + 1;
  uint16_t h = area->y2 - area->y1 + 1;
  tft.startWrite();
  tft.setAddrWindow(area->x1, area->y1, w, h);
  tft.pushColors((uint16_t *)&color_p->full, w * h, true);
  tft.endWrite();
  lv_disp_flush_ready(disp);
}

void setup() {
 // pinMode(TFT_BL, OUTPUT);
 // digitalWrite(TFT_BL, LOW);
  Serial.begin(115200);
  delay(100);

  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(TFT_BLACK);

  delay(50);
  //digitalWrite(TFT_BL, HIGH);

  // Initialize LVGL
  lv_init();

  memset(buf, 0x00, sizeof(buf));
  //lv_refr_now(NULL);
  lv_disp_draw_buf_init(&draw_buf, buf, NULL, LV_HOR_RES_MAX * 10);

  // Setup LVGL Display Driver
  static lv_disp_drv_t disp_drv;
  lv_disp_drv_init(&disp_drv);
  disp_drv.hor_res = 320;
  disp_drv.ver_res = 240;
  disp_drv.flush_cb = my_disp_flush;
  disp_drv.draw_buf = &draw_buf;
  lv_disp_drv_register(&disp_drv);

  lv_obj_set_style_bg_color(lv_scr_act(), lv_color_make(30, 30, 30), LV_PART_MAIN);

  lv_obj_t *label = lv_label_create(lv_scr_act());
  lv_label_set_text(label, "Test");
  lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
  lv_obj_set_style_text_color(label, lv_color_white(), LV_PART_MAIN | LV_STATE_DEFAULT);
}

void loop() {
  delay(500);
  lv_timer_handler();
}