LVGL Issue

[nishad2m8]

Hi, I managed to get the display and touch working with LVGL 8.3.11, but the problem is that the screen area glitches when text changes, animations occur, etc. How can I solve this?

#include <lvgl.h>
#include <Arduino_GFX_Library.h>
#include "Arduino_DriveBus_Library.h"
#include "pin_config.h"
#include <ui.h>

// Initialize the data bus for the display
Arduino_DataBus *bus = new Arduino_ESP32QSPI(
    LCD_CS /* CS */, LCD_SCLK /* SCK */, LCD_SDIO0 /* SDIO0 */, LCD_SDIO1 /* SDIO1 */,
    LCD_SDIO2 /* SDIO2 */, LCD_SDIO3 /* SDIO3 */);

// Initialize the display with no rotation and no IPS mode
Arduino_GFX *gfx = new Arduino_CO5300(bus, LCD_RST /* RST */,
                                      0 /* rotation */, false /* IPS */, LCD_WIDTH, LCD_HEIGHT,
                                      20 /* col offset 1 */, 0 /* row offset 1 */, 0 /* col_offset2 */, 0 /* row_offset2 */);

// Initialize the I2C bus for touch
std::shared_ptr<Arduino_IIC_DriveBus> IIC_Bus =
    std::make_shared<Arduino_HWIIC>(IIC_SDA, IIC_SCL, &Wire);

void Arduino_IIC_Touch_Interrupt(void);

// Initialize touch controller
std::unique_ptr<Arduino_IIC> FT3168(new Arduino_CST816x(IIC_Bus, FT3168_DEVICE_ADDRESS,
                                                        DRIVEBUS_DEFAULT_VALUE, TP_INT, Arduino_IIC_Touch_Interrupt));

// Interrupt handling for touch
void Arduino_IIC_Touch_Interrupt(void)
{
    FT3168->IIC_Interrupt_Flag = true;
}

// LVGL buffer and driver setup
static lv_disp_draw_buf_t draw_buf;
static lv_color_t buf[LCD_WIDTH * LCD_HEIGHT / 2]; // Larger buffer for better performance

// Display flush function for LVGL
void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
{
    int32_t w = (area->x2 - area->x1 + 1);
    int32_t h = (area->y2 - area->y1 + 1);

    // Use draw16bitRGBBitmap() to draw the pixel data
    gfx->startWrite();
    gfx->draw16bitRGBBitmap(area->x1, area->y1, (uint16_t *)color_p, w, h);
    gfx->endWrite();

    lv_disp_flush_ready(disp); // Indicate that flushing is done
}

// Touchpad read function for LVGL
void touchpad_read(lv_indev_drv_t *indev_driver, lv_indev_data_t *data)
{
    if (FT3168->IIC_Interrupt_Flag == true)
    {
        FT3168->IIC_Interrupt_Flag = false;

        int touch_x = FT3168->IIC_Read_Device_Value(FT3168->Arduino_IIC_Touch::Value_Information::TOUCH_COORDINATE_X);
        int touch_y = FT3168->IIC_Read_Device_Value(FT3168->Arduino_IIC_Touch::Value_Information::TOUCH_COORDINATE_Y);

        data->state = LV_INDEV_STATE_PR;
        data->point.x = touch_x;
        data->point.y = touch_y;
    }
    else
    {
        data->state = LV_INDEV_STATE_REL;
    }
}

void setup()
{
    Serial.begin(115200);
    Serial.println("Starting Setup...");

    // Ensure the display is enabled
    pinMode(LCD_EN, OUTPUT);
    digitalWrite(LCD_EN, HIGH);

    // Initialize the display
    Serial.println("Initializing Display...");
    gfx->begin();
    gfx->fillScreen(BLACK);
    gfx->Display_Brightness(255);

    // Initialize LVGL
    Serial.println("Initializing LVGL...");
    lv_init();

    // Initialize display buffer
    lv_disp_draw_buf_init(&draw_buf, buf, NULL, LCD_WIDTH * LCD_HEIGHT / 2);

    // Initialize display driver
    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);
    disp_drv.hor_res = LCD_WIDTH;
    disp_drv.ver_res = LCD_HEIGHT;
    disp_drv.flush_cb = my_disp_flush;
    disp_drv.draw_buf = &draw_buf;
    lv_disp_drv_register(&disp_drv);
    Serial.println("Display driver registered.");

    // Initialize touch input driver
    FT3168->begin();
    Serial.println("Touch Input Initialized");

    static lv_indev_drv_t indev_drv;
    lv_indev_drv_init(&indev_drv);
    indev_drv.type = LV_INDEV_TYPE_POINTER;
    indev_drv.read_cb = touchpad_read;
    lv_indev_drv_register(&indev_drv);
    Serial.println("Touch input driver registered.");

    // Initialize the user interface
    ui_init();
}

void loop()
{
    lv_task_handler();  // Efficiently handle LVGL tasks
    delay(5);           // Experiment with minimal delay for smoother UI updates
}

CPU usage and FPS count is glitching. UI is simple LVGL color wheel and slider. See this
https://github.com/user-attachments/assets/d213e5a6-7717-4582-8955-5f17e5941fda