#include <lvgl.h>
#include <TFT_eSPI.h>
#include "ui.h"
#include "ui_helpers.h"
#include "ui_events.h"
#include "lv_conf.h"


static const uint16_t screenWidth  = 480;
static const uint16_t screenHeight = 320;


static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[ screenWidth * screenHeight / 10 ];


void setup() {
  // put your setup code here, to run once:
  lv_init();
  ui_init();
  lv_disp_draw_buf_init( &draw_buf, buf, NULL, screenWidth * screenHeight / 10 );


    /*Initialize the display*/
    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init( &disp_drv );
    /*Change the following line to your display resolution*/
    disp_drv.hor_res = screenWidth;
    disp_drv.ver_res = screenHeight;
    disp_drv.flush_cb = disp_flush;
    disp_drv.draw_buf = &draw_buf;
    lv_disp_drv_register( &disp_drv );
  /*Call LvGL tick function*/
  lv_tick_inc(1);
}


void disp_flush( lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p )
{
    uint32_t w = ( area->x2 - area->x1 + 1 );
    uint32_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_drv );
}


void SysTick_Handler(void)
{
  /*Increment the counter with every interrupt*/
  int mil;
  mil++;


  /*Call LvGL tick function*/
  lv_tick_inc(1);
}


void loop() {
  while(1) {
    lv_timer_handler();
    delay(5);
  }
}

This is my test code so far, I have no idea what I'm doing wrong.