STM32 plus SSD1306. The project builds ok but display failed to work. When I go into debug I can step through all the code except the three functions from the display library I inserted in main.c . Init, Fill and Update. It jumps over them. Why?

[mseil.1]

< 

/* Initialize all configured peripherals */

 MX_GPIO_Init();

 MX_I2C1_Init();

 /* USER CODE BEGIN 2 */

 void ssd1306_Init(void);

 void ssd1306_Fill(White);

 void ssd1306_UpdateScreen(void);

  /* USER CODE END 2 */

 /* Infinite loop */

 /* USER CODE BEGIN WHILE */

 while (1)

 {

/>