1/*Using LVGL with Arduino requires some extra steps:
2 *Be sure to read the docs here: https://docs.lvgl.io/master/integration/framework/arduino.html  */
3
4#include <lvgl.h>
5
6#if LV_USE_TFT_ESPI
7#include <TFT_eSPI.h>
8#endif
9
10/*To use the built-in examples and demos of LVGL uncomment the includes below respectively.
11 *You also need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
12 *Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
13 *as the examples and demos are now part of the main LVGL library. */
14
15//#include <examples/lv_examples.h>
16//#include <demos/lv_demos.h>
17
18/*Set to your screen resolution and rotation*/
19#define TFT_HOR_RES   320
20#define TFT_VER_RES   240
21#define TFT_ROTATION  LV_DISPLAY_ROTATION_0
22
23/*LVGL draw into this buffer, 1/10 screen size usually works well. The size is in bytes*/
24#define DRAW_BUF_SIZE (TFT_HOR_RES * TFT_VER_RES / 10 * (LV_COLOR_DEPTH / 8))
25uint32_t draw_buf[DRAW_BUF_SIZE / 4];
26
27#if LV_USE_LOG != 0
28void my_print( lv_log_level_t level, const char * buf )
29{
30    LV_UNUSED(level);
31    Serial.println(buf);
32    Serial.flush();
33}
34#endif
35
36/* LVGL calls it when a rendered image needs to copied to the display*/
37void my_disp_flush( lv_display_t *disp, const lv_area_t *area, uint8_t * px_map)
38{
39    /*Copy `px map` to the `area`*/
40
41    /*For example ("my_..." functions needs to be implemented by you)
42    uint32_t w = lv_area_get_width(area);
43    uint32_t h = lv_area_get_height(area);
44
45    my_set_window(area->x1, area->y1, w, h);
46    my_draw_bitmaps(px_map, w * h);
47     */
48
49    /*Call it to tell LVGL you are ready*/
50    lv_display_flush_ready(disp);
51}
52
53/*Read the touchpad*/
54void my_touchpad_read( lv_indev_t * indev, lv_indev_data_t * data )
55{
56    /*For example  ("my_..." functions needs to be implemented by you)
57    int32_t x, y;
58    bool touched = my_get_touch( &x, &y );
59
60    if(!touched) {
61        data->state = LV_INDEV_STATE_RELEASED;
62    } else {
63        data->state = LV_INDEV_STATE_PRESSED;
64
65        data->point.x = x;
66        data->point.y = y;
67    }
68     */
69}
70
71/*use Arduinos millis() as tick source*/
72static uint32_t my_tick(void)
73{
74    return millis();
75}
76
77void setup()
78{
79    String LVGL_Arduino = "Hello Arduino! ";
80    LVGL_Arduino += String('V') + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();
81
82    Serial.begin( 115200 );
83    Serial.println( LVGL_Arduino );
84
85    lv_init();
86
87    /*Set a tick source so that LVGL will know how much time elapsed. */
88    lv_tick_set_cb(my_tick);
89
90    /* register print function for debugging */
91#if LV_USE_LOG != 0
92    lv_log_register_print_cb( my_print );
93#endif
94
95    lv_display_t * disp;
96#if LV_USE_TFT_ESPI
97    /*TFT_eSPI can be enabled lv_conf.h to initialize the display in a simple way*/
98    disp = lv_tft_espi_create(TFT_HOR_RES, TFT_VER_RES, draw_buf, sizeof(draw_buf));
99    lv_display_set_rotation(disp, TFT_ROTATION);
100
101#else
102    /*Else create a display yourself*/
103    disp = lv_display_create(TFT_HOR_RES, TFT_VER_RES);
104    lv_display_set_flush_cb(disp, my_disp_flush);
105    lv_display_set_buffers(disp, draw_buf, NULL, sizeof(draw_buf), LV_DISPLAY_RENDER_MODE_PARTIAL);
106#endif
107
108    /*Initialize the (dummy) input device driver*/
109    lv_indev_t * indev = lv_indev_create();
110    lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER); /*Touchpad should have POINTER type*/
111    lv_indev_set_read_cb(indev, my_touchpad_read);
112
113    /* Create a simple label
114     * ---------------------
115     lv_obj_t *label = lv_label_create( lv_screen_active() );
116     lv_label_set_text( label, "Hello Arduino, I'm LVGL!" );
117     lv_obj_align( label, LV_ALIGN_CENTER, 0, 0 );
118
119     * Try an example. See all the examples
120     *  - Online: https://docs.lvgl.io/master/examples.html
121     *  - Source codes: https://github.com/lvgl/lvgl/tree/master/examples
122     * ----------------------------------------------------------------
123
124     lv_example_btn_1();
125
126     * Or try out a demo. Don't forget to enable the demos in lv_conf.h. E.g. LV_USE_DEMO_WIDGETS
127     * -------------------------------------------------------------------------------------------
128
129     lv_demo_widgets();
130     */
131
132    lv_obj_t *label = lv_label_create( lv_screen_active() );
133    lv_label_set_text( label, "Hello Arduino, I'm LVGL!" );
134    lv_obj_align( label, LV_ALIGN_CENTER, 0, 0 );
135
136    Serial.println( "Setup done" );
137}
138
139void loop()
140{
141    lv_timer_handler(); /* let the GUI do its work */
142    delay(5); /* let this time pass */
143}
144