#include <Adafruit_ILI9341.h>
#include "lv_conf.h"
#include <lvgl.h>

/*Change to your screen resolution*/
static const uint16_t screenWidth  = 240;
static const uint16_t screenHeight = 320;

static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[ screenWidth * 10 ];
#define TFT_DC 2
#define TFT_CS 15
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
/* Display flushing */
void my_disp_flush( lv_disp_t *disp, 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.setAddrWindow( area->x1, area->y1, w, h );
    lv_disp_flush_ready( disp );
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  //tft.begin();
  //tft.setRotation(0);
  //tft.setTextColor(ILI9341_WHITE);
  //tft.setTextSize(2);
  //tft.print("Connecting to WiFi");
  pinMode(13, OUTPUT);
  String LVGL_Arduino = "Hello Arduino! ";
    LVGL_Arduino += String('V') + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();

    Serial.println( LVGL_Arduino );
    Serial.println( "I am LVGL_Arduino" );

    lv_init();

#if LV_USE_LOG != 0
    lv_log_register_print_cb( my_print ); /* register print function for debugging */
#endif

    tft.begin();          /* TFT init */
    tft.setRotation( 3 ); /* Landscape orientation, flipped */
    lv_disp_draw_buf_init( &draw_buf, buf, NULL, screenWidth * 10 );
    /*Initialize the display*/
    static lv_disp_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 = my_disp_flush;
    disp_drv.draw_buf = &draw_buf;
    lv_disp_drv_register( &disp_drv );

    /*Initialize the (dummy) input device driver*/
    static lv_indev_t indev_drv;
    lv_indev_drv_init( &indev_drv );
    indev_drv.type = LV_INDEV_TYPE_POINTER;
    indev_drv.read_cb = my_touchpad_read;
    lv_indev_drv_register( &indev_drv );

#if 1
    /* Create simple label */
    lv_obj_t *label = lv_label_create( lv_scr_act() );
    lv_label_set_text( label, LVGL_Arduino.c_str() );
    lv_obj_align( label, LV_ALIGN_CENTER, 0, 0 );
#else
    /* Try an example from the lv_examples Arduino library
       make sure to include it as written above.
    lv_example_btn_1();
   */

    // uncomment one of these demos
    lv_demo_widgets();            // OK
    // lv_demo_benchmark();          // OK
    // lv_demo_keypad_encoder();     // works, but I haven't an encoder
    // lv_demo_music();              // NOK
    // lv_demo_printer();
    // lv_demo_stress();             // seems to be OK
#endif
    Serial.println( "Setup done" );
}

void loop()  {
  lv_timer_handler(); /* let the GUI do its work */
  delay( 5 );
 //digitalWrite(13, HIGH);
 //delay(300);
 //digitalWrite(13, LOW);
 //delay(300);
}