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/*Using LVGL with Arduino requires some extra steps:
*Be sure to read the docs here: https://docs.lvgl.io/master/integration/framework/arduino.html */
#include <lvgl.h>
#if LV_USE_TFT_ESPI
#include <TFT_eSPI.h>
#endif
/*To use the built-in examples and demos of LVGL uncomment the includes below respectively.
*You also need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
*Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
*as the examples and demos are now part of the main LVGL library. */
//#include <examples/lv_examples.h>
//#include <demos/lv_demos.h>
/*Set to your screen resolution and rotation*/
#define TFT_HOR_RES 320
#define TFT_VER_RES 240
#define TFT_ROTATION LV_DISPLAY_ROTATION_0
/*LVGL draw into this buffer, 1/10 screen size usually works well. The size is in bytes*/
#define DRAW_BUF_SIZE (TFT_HOR_RES * TFT_VER_RES / 10 * (LV_COLOR_DEPTH / 8))
uint32_t draw_buf[DRAW_BUF_SIZE / 4];
#if LV_USE_LOG != 0
void my_print( lv_log_level_t level, const char * buf )
{
LV_UNUSED(level);
Serial.println(buf);
Serial.flush();
}
#endif
/* LVGL calls it when a rendered image needs to copied to the display*/
void my_disp_flush( lv_display_t *disp, const lv_area_t *area, uint8_t * px_map)
{
/*Copy `px map` to the `area`*/
/*For example ("my_..." functions needs to be implemented by you)
uint32_t w = lv_area_get_width(area);
uint32_t h = lv_area_get_height(area);
my_set_window(area->x1, area->y1, w, h);
my_draw_bitmaps(px_map, w * h);
*/
/*Call it to tell LVGL you are ready*/
lv_display_flush_ready(disp);
}
/*Read the touchpad*/
void my_touchpad_read( lv_indev_t * indev, lv_indev_data_t * data )
{
/*For example ("my_..." functions needs to be implemented by you)
int32_t x, y;
bool touched = my_get_touch( &x, &y );
if(!touched) {
data->state = LV_INDEV_STATE_RELEASED;
} else {
data->state = LV_INDEV_STATE_PRESSED;
data->point.x = x;
data->point.y = y;
}
*/
}
/*use Arduinos millis() as tick source*/
static uint32_t my_tick(void)
{
return millis();
}
void setup()
{
String LVGL_Arduino = "Hello Arduino! ";
LVGL_Arduino += String('V') + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();
Serial.begin( 115200 );
Serial.println( LVGL_Arduino );
lv_init();
/*Set a tick source so that LVGL will know how much time elapsed. */
lv_tick_set_cb(my_tick);
/* register print function for debugging */
#if LV_USE_LOG != 0
lv_log_register_print_cb( my_print );
#endif
lv_display_t * disp;
#if LV_USE_TFT_ESPI
/*TFT_eSPI can be enabled lv_conf.h to initialize the display in a simple way*/
disp = lv_tft_espi_create(TFT_HOR_RES, TFT_VER_RES, draw_buf, sizeof(draw_buf));
lv_display_set_rotation(disp, TFT_ROTATION);
#else
/*Else create a display yourself*/
disp = lv_display_create(TFT_HOR_RES, TFT_VER_RES);
lv_display_set_flush_cb(disp, my_disp_flush);
lv_display_set_buffers(disp, draw_buf, NULL, sizeof(draw_buf), LV_DISPLAY_RENDER_MODE_PARTIAL);
#endif
/*Initialize the (dummy) input device driver*/
lv_indev_t * indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER); /*Touchpad should have POINTER type*/
lv_indev_set_read_cb(indev, my_touchpad_read);
/* Create a simple label
* ---------------------
lv_obj_t *label = lv_label_create( lv_screen_active() );
lv_label_set_text( label, "Hello Arduino, I'm LVGL!" );
lv_obj_align( label, LV_ALIGN_CENTER, 0, 0 );
* Try an example. See all the examples
* - Online: https://docs.lvgl.io/master/examples.html
* - Source codes: https://github.com/lvgl/lvgl/tree/master/examples
* ----------------------------------------------------------------
lv_example_btn_1();
* Or try out a demo. Don't forget to enable the demos in lv_conf.h. E.g. LV_USE_DEMO_WIDGETS
* -------------------------------------------------------------------------------------------
lv_demo_widgets();
*/
lv_obj_t *label = lv_label_create( lv_screen_active() );
lv_label_set_text( label, "Hello Arduino, I'm LVGL!" );
lv_obj_align( label, LV_ALIGN_CENTER, 0, 0 );
Serial.println( "Setup done" );
}
void loop()
{
lv_timer_handler(); /* let the GUI do its work */
delay(5); /* let this time pass */
}
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