Nothing happens after display initialization (stm32h7+st7789)

Description

Hello!
This is my first experience with LVGL, so I don’t quite understand how it works yet, forgive me in advance for my stupid mistakes.
I am using a stm32h743vit6 microcontroller on a devebox board and a st7789 display with 3-pin spi without touchscreen.
I use half-duplex master mode spi with DMA, I wrote the display driver functions myself in main.c, I tested them separately, and they worked as they should.

The program compiles, but when I run the program, the display only initializes.

What MCU/Processor/Board and compiler are you using?

smt32h743vit6 on board DevEBox/ STM32CubeIDE

What LVGL version are you using?

master(latest)

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "lvgl.h"
#include <stdio.h>

#define TFT_CS_PIN GPIO_PIN_4 // Пример: Пин CS
#define TFT_DC_PIN GPIO_PIN_5 // Пример: Пин DC
#define TFT_RST_PIN GPIO_PIN_6 // Пример: Пин RST

#define ST7789_HEIGHT 240
#define ST7789_WIDTH 320
#define BUFFER_SIZE ST7789_HEIGHT*ST7789_WIDTH*2
#define HW_BUFFER_SIZE 320*80


#define BYTES_PER_PIXEL (LV_COLOR_FORMAT_GET_SIZE(LV_COLOR_FORMAT_RGB565)) /* will be 2 for RGB565 */

static uint8_t buf_1[HW_BUFFER_SIZE*BYTES_PER_PIXEL];
static uint8_t buf_2[HW_BUFFER_SIZE*BYTES_PER_PIXEL];

lv_display_t * disp;



/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

SPI_HandleTypeDef hspi1;
DMA_HandleTypeDef hdma_spi1_tx;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MPU_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

void ST7789_IntToByte(uint16_t data1, uint8_t data2[]){
	*data2 = (uint8_t)(data1>>8);
	*(data2+1) = (uint8_t)(data1&0xFF);
}

void SPI_SendCommand(uint8_t cmd) {
	HAL_GPIO_WritePin(GPIOB, TFT_CS_PIN, GPIO_PIN_RESET); // CS LOW
    HAL_GPIO_WritePin(GPIOB, TFT_DC_PIN, GPIO_PIN_RESET); // Установите DC в 0 для команды
    HAL_SPI_Transmit(&hspi1, &cmd, 1, 100); // Отправьте команду
    HAL_GPIO_WritePin(GPIOB, TFT_CS_PIN, GPIO_PIN_SET); // CS HIGH
}

void SPI_SendData(uint8_t *data, uint32_t size, _Bool isDMA) {

	HAL_GPIO_WritePin(GPIOB, TFT_CS_PIN, GPIO_PIN_RESET); // CS LOW
    HAL_GPIO_WritePin(GPIOB, TFT_DC_PIN, GPIO_PIN_SET); // Установите DC в 1 для данных
    if (!isDMA) HAL_SPI_Transmit(&hspi1, data, size, 500); // Отправьте данные
    else {
    	HAL_SPI_Transmit_DMA(&hspi1, data, size);
    HAL_GPIO_WritePin(GPIOB, TFT_CS_PIN, GPIO_PIN_SET); // CS HIGH
    }
}

void ST7789_Init() {

    HAL_GPIO_WritePin(GPIOB, TFT_RST_PIN, GPIO_PIN_RESET); // Сброс дисплея
    HAL_Delay(200);
    HAL_GPIO_WritePin(GPIOB, TFT_RST_PIN, GPIO_PIN_SET);
    HAL_Delay(200);

    SPI_SendCommand(0x01); // SWRESET
    HAL_Delay(200);
    SPI_SendCommand(0x11); // SLPOUT
    HAL_Delay(500);

    SPI_SendCommand(0x3A); // COLMOD
    uint8_t color_mode = 0x05; // 16 битный цвет (RGB 565)
    SPI_SendData(&color_mode, 1, 0);

    SPI_SendCommand(0x36); // MADCTL
    uint8_t madctl = 0x14; // Настройка направления (обычно 0x00)
    SPI_SendData(&madctl, 1, 0);

    SPI_SendCommand(0x21);

    SPI_SendCommand(0x13);

    SPI_SendCommand(0x29); // DISPON
}

void ST7789_FillScreen(uint16_t color) {

	uint8_t data[HW_BUFFER_SIZE * 2]; // Массив для заполнения экрана
	for (uint32_t i = 0; i < HW_BUFFER_SIZE; i++) {
	ST7789_IntToByte(color, &data[2 * i]);
	}

    SPI_SendCommand(0x2A); // CASET
    uint8_t caset[] = {0x00, 0x00, 0x00, 0xEF}; // Установите область по X
    SPI_SendData(caset, sizeof(caset), 0);

    SPI_SendCommand(0x2B); // RASET
    uint8_t raset[] = {0x00, 0x00, 0x01, 0x3F}; // Установите область по Y
    SPI_SendData(raset, sizeof(raset), 0);

    SPI_SendCommand(0x2C); // RAMWR


    for (int i = 0; i < BUFFER_SIZE / (HW_BUFFER_SIZE * 2); i++) {
    SPI_SendData(data, sizeof(data), 1); // Отправка данных на дисплей
    }

}

void ST7789_MakePicture(uint8_t data[], uint32_t sizeofdata, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2) {

	uint8_t caset[4];
	uint8_t raset[4];

	ST7789_IntToByte(x1, caset);
	ST7789_IntToByte(y1, raset);
	ST7789_IntToByte(x2, caset+2);
    ST7789_IntToByte(y2, raset+2);


    SPI_SendCommand(0x2A); // CASET
    SPI_SendData(caset, sizeof(caset), 0);

    SPI_SendCommand(0x2B); // RASET
    SPI_SendData(raset, sizeof(raset), 0);

    SPI_SendCommand(0x2C); // RAMWR


    for (uint32_t i = 0; i < sizeofdata; i += (240 * 80 * 2)) {
    uint16_t chunk_size = (sizeofdata - i > (240 * 80 * 2)) ? (240 * 80 * 2) : (sizeofdata - i);
    SPI_SendData(data + i, chunk_size, 1);
    }
}

void my_flush_cb(lv_display_t * disp, const lv_area_t * area, lv_color_t * color_p)
{

    uint16_t height = area->y2 - area->y1 + 1;
    uint16_t width = area->x2 - area->x1 + 1;

    uint8_t buff[height * width * 2];

    //Write colour to each pixel
    for (int i = 0; i < width * height; i++) {
    uint16_t color_full = (color_p->red << 11) | (color_p->green << 5) | (color_p->blue);
    ST7789_IntToByte(color_full,&buff[i * 2]);
    color_p++;
    }

    ST7789_MakePicture(buff, (uint32_t)(height * width * 2), area->x1, area->y1, area->x2, area->y2);
}



/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MPU Configuration--------------------------------------------------------*/
  MPU_Config();

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */

  //Initialise LVGL UI library
  lv_init();

  ST7789_Init();

  disp = lv_display_create(ST7789_WIDTH, ST7789_HEIGHT); /* Basic initialization with horizontal and vertical resolution in pixels */
  lv_display_set_flush_cb(disp, my_flush_cb); /* Set a flush callback to draw to the display */
  lv_display_set_buffers(disp, buf_1, buf_2, sizeof(buf_1), LV_DISPLAY_RENDER_MODE_PARTIAL); /* Set an initialized buffer */

  /* Change Active Screen's background color */
  lv_obj_set_style_bg_color(lv_screen_active(), lv_color_hex(0x003a57), LV_PART_MAIN);
  lv_obj_set_style_text_color(lv_screen_active(), lv_color_hex(0xffffff), LV_PART_MAIN);

  /* Create a spinner */
  lv_obj_t * spinner = lv_spinner_create(lv_screen_active());
  lv_obj_set_size(spinner, 64, 64);
  lv_obj_align(spinner, LV_ALIGN_BOTTOM_MID, 0, 0);


  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {

	lv_timer_handler();
	HAL_Delay(10);

    /* USER CODE END WHILE */
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Supply configuration update enable
  */
  HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

  while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 12;
  RCC_OscInitStruct.PLL.PLLP = 2;
  RCC_OscInitStruct.PLL.PLLQ = 2;
  RCC_OscInitStruct.PLL.PLLR = 2;
  RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3;
  RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
  RCC_OscInitStruct.PLL.PLLFRACN = 4096;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
                              |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV1;
  RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief SPI1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_SPI1_Init(void)
{

  /* USER CODE BEGIN SPI1_Init 0 */

  /* USER CODE END SPI1_Init 0 */

  /* USER CODE BEGIN SPI1_Init 1 */

  /* USER CODE END SPI1_Init 1 */
  /* SPI1 parameter configuration*/
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_1LINE;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 0x0;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
  hspi1.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
  hspi1.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
  hspi1.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
  hspi1.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
  hspi1.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
  hspi1.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
  hspi1.Init.IOSwap = SPI_IO_SWAP_DISABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI1_Init 2 */

  /* USER CODE END SPI1_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Stream0_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6, GPIO_PIN_RESET);

  /*Configure GPIO pins : PB4 PB5 PB6 */
  GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi)
    {
      if (hspi->Instance == SPI1)
      {
        //queue = 0;
        lv_disp_flush_ready(disp);
      }
    }

/* USER CODE END 4 */

 /* MPU Configuration */

void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct = {0};

  /* Disables the MPU */
  HAL_MPU_Disable();

  /** Initializes and configures the Region and the memory to be protected
  */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.BaseAddress = 0x0;
  MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
  MPU_InitStruct.SubRegionDisable = 0x87;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  /* Enables the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);

}

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

I figured it out. Guys, if you are faced with the same problem as me, please contact me, I will try to help