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

Question

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<Arduino.h>
#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 <lv_demo.h>
/*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

Answer 1

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。