ESP32 LVGL配置教程

#include <lvgl.h>
#include <TFT_eSPI.h>
/*If you want to use the LVGL examples,
  make sure to install the lv_examples Arduino library
  and uncomment the following line.
#include <lv_examples.h>
*/

#include <demos\lv_demos.h>

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

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

// TFT_eSPI tft = TFT_eSPI(screenWidth, screenHeight); /* TFT instance */
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library

#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, 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 );
}

/*Read the touchpad*/
void my_touchpad_read( lv_indev_drv_t * indev_driver, 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( 1 ); /* 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 };
​    uint16_t calData[5] = { 409, 3416, 335, 3321, 7   };
​    tft.setTouch( calData );

​    lv_disp_draw_buf_init( &draw_buf, buf, NULL, screenWidth * 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 );

#if 0
    /* 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 );
}