提问：在使用platformio编译lvgl arduino例程中，将其烧录进esp32里之后只显示一半，另一半是花屏的

使用platformio编译lvgl 库里带的 exampl中的arduino例程，然后将其烧录到lilygo t_watch2021中，显示只显示一半的屏幕，如图

但是如果不使用lvgl，只是简单的写一些TFT_eSPI的显示程序，显示又是正常的，说明我的显示屏配置是正常的
lvgl例程的代码如下：

#include
#include 
#include 
/*If you want to use the LVGL examples,
  make sure to install the lv_examples Arduino library
  and uncomment the following line.
#include 
*/
#include 
/*Change to your screen resolution*/
static const uint16_t screenWidth  = 240;
static const uint16_t screenHeight = 240;

static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[ 240 ];

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, const lv_area_t *area, lv_color_t *color_p )
{
    uint32_t w = ( area->x2 - area->x1 + 2 );
    uint32_t h = ( area->y2 - area->y1 + 2 );

    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( 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, 240);

    /*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 );
}

 

使用的板子是esp32，显示屏是GC9a01

以下内容引用CHATGPT、有用望采纳：

可能是因为屏幕分辨率的设置不正确导致的。建议检查屏幕驱动和LVGL库中的分辨率设置是否匹配，例如屏幕的宽度和高度是否正确设置为240像素。

同时，还可以尝试在LVGL初始化之前设置TFT_eSPI库的旋转角度，例如将屏幕旋转270度，即tft.setRotation(1)。

另外，建议检查LVGL库中的显示缓冲区大小是否正确设置，以及在显示刷新时是否正确的使用 LVGL 的 lv_disp_flush_ready() 函数。

以下是修改后的代码示例：

#include <Arduino.h>
#include <lvgl.h>
#include <TFT_eSPI.h>
#include <lv_demo.h>

static const uint16_t screenWidth  = 240;
static const uint16_t screenHeight = 240;

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

TFT_eSPI tft = TFT_eSPI(screenWidth,screenHeight);

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, w * h, true);
    tft.endWrite();

    lv_disp_flush_ready(disp_drv);
}

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;
        data->point.x = touchX;
        data->point.y = touchY;
    }
}

void setup()
{
    lv_init();

    tft.begin();
    tft.setRotation(1);
    tft.fillScreen(TFT_BLACK);
    uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
    tft.setTouch(calData);

    lv_disp_draw_buf_init(&draw_buf, buf, NULL, LV_HOR_RES_MAX * 10);

    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);
    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);

    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);

    lv_demo_widgets();
}

void loop()
{
    lv_task_handler();
    delay(5);
}

注意：以上代码仅供参考，具体实现可能需要根据实际情况进行调整。

引用chatGPT作答，根据您的描述，LVGL的示例程序在LilyGo T-Watch 2021上只显示一半的屏幕。这种情况通常是由于屏幕的配置不正确或者在驱动屏幕时使用了错误的坐标系。下面是一些可能有助于解决问题的步骤：

1.确保您的显示屏配置是正确的。在使用LVGL之前，请确保您的屏幕已正确配置。请查阅您的屏幕文档以获取正确的配置选项。

2.确保您的代码使用正确的坐标系。LilyGo T-Watch 2021使用了一个非常不同的坐标系。请确保您的代码使用正确的坐标系。如果您不确定，可以尝试旋转显示器并查看是否显示正确。

3.如果您仍然无法解决问题，可以尝试与LilyGo T-Watch 2021的制造商联系，以获取帮助。他们可能能够提供有关如何正确配置和使用该设备的信息。