so this is a mostly un edited copy of the Ino file that came as an example for LVGL. I followed the directions on the website to a T. and when I compile this trying to use the example "lv_demo_widgets();" I get these errors:
C:\Users\natha\Documents\Arduino\Test_gui\Test_gui\Test_gui.ino: In function 'void setup()':
C:\Users\natha\Documents\Arduino\Test_gui\Test_gui\Test_gui.ino:126:5: error: 'lv_demo_widgets' was not declared in this scope
lv_demo_widgets();
^~~~~~~~~~~~~~~
C:\Users\natha\Documents\Arduino\Test_gui\Test_gui\Test_gui.ino:126:5: note: suggested alternative: 'lv_clamp_width'
lv_demo_widgets();
^~~~~~~~~~~~~~~
lv_clamp_width
Using library lvgl at version 8.4.0 in folder: C:\Users\natha\Documents\Arduino\Test_gui\libraries\lvgl
Using library TFT_eSPI at version 2.5.43 in folder: C:\Users\natha\Documents\Arduino\Test_gui\libraries\TFT_eSPI
Using library SPI at version 1.0 in folder: C:\Users\natha\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\SPI
exit status 1
Compilation error: 'lv_demo_widgets' was not declared in this scope
/*Using LVGL with Arduino requires some extra steps:
*Be sure to read the docs here: https://docs.lvgl.io/master/get-started/platforms/arduino.html */
#include <lvgl.h>
#include <TFT_eSPI.h>
/*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. */
/*Change to your screen resolution*/
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 ];
TFT_eSPI tft = TFT_eSPI(screenWidth, screenHeight); /* TFT instance */
#if LV_USE_LOG != 0
/* Serial debugging */
void my_print(const char * buf)
{
Serial.printf(buf);
Serial.flush();
}
#endif
/* Display flushing */
void my_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 );
}
/*Read the touchpad*/
void my_touchpad_read( lv_indev_drv_t * indev_drv, lv_indev_data_t * data )
{
uint16_t touchX, touchY;
bool touched = tft.getTouch( &touchX, &touchY, 600 );
if( !touched )
{
data->state = LV_INDEV_STATE_REL;
}
else
{
data->state = LV_INDEV_STATE_PR;
/*Set the coordinates*/
data->point.x = touchX;
data->point.y = touchY;
Serial.print( "Data x " );
Serial.println( touchX );
Serial.print( "Data y " );
Serial.println( touchY );
}
}
void setup()
{
Serial.begin( 115200 ); /* prepare for possible serial debug */
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 */
/*Set the touchscreen calibration data,
the actual data for your display can be acquired using
the Generic -> Touch_calibrate example from the TFT_eSPI library*/
uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
tft.setTouch( calData );
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 = my_disp_flush;
disp_drv.draw_buf = &draw_buf;
lv_disp_drv_register( &disp_drv );
/*Initialize the (dummy) input device driver*/
static lv_indev_drv_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 );
/* Create simple label */
lv_obj_t *label = lv_label_create( lv_scr_act() );
lv_label_set_text( label, "Hello Ardino and 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/e7f88efa5853128bf871dde335c0ca8da9eb7731/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_DEMOS_WIDGETS*/
lv_demo_widgets();
// lv_demo_benchmark();
// lv_demo_keypad_encoder();
// lv_demo_music();
// lv_demo_printer();
// lv_demo_stress();
Serial.println( "Setup done" );
}
void loop()
{
lv_timer_handler(); /* let the GUI do its work */
delay( 5 );
}
