stm32 HAL I2C Problem

Question

I am using a Nucleos f103rb board and want to programm a simple i2c communication with a 0.91 oled i2c display. In order to see some data from the i2c I connected my oszi to sda and scl. But when I run my program I only see a permament 3.3V voltage on both pins. I have tried to get the fault, so I looked up what the state of HAL_I2C_Master_Transmit is and it is always busy.
I have set the right pins of I2C in MXCube, and enable I2C, so what I am doing wrong?
Thanks for answering.

Answer 1

Here is my main code:
int main(void)
{
/* USER CODE BEGIN 1 */
HAL_StatusTypeDef ret;
uint16_t address = 1;
/* USER CODE END 1 */

/* 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_I2C1_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */

HAL_UART_Transmit(&huart2, (uint8_t*)("\ronline\n\r\n"), strlen("\ronline\n\r\n"), HAL_MAX_DELAY);
/* USER CODE END 2 */

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

/* USER CODE BEGIN 3 */
ret = HAL_I2C_Master_Transmit(&hi2c1, address, (uint8_t*)0xE3, 1, HAL_MAX_DELAY);

if ( ret == HAL_ERROR )
{
HAL_UART_Transmit(&huart2, (uint8_t*)("\rError\n"), strlen("\rError\n"), HAL_MAX_DELAY);
address++;
} else if(ret == HAL_BUSY)
{
HAL_UART_Transmit(&huart2, (uint8_t*)("\rBusy\n"), strlen("\rBusy\n"), HAL_MAX_DELAY);
}
else
{
HAL_UART_Transmit(&huart2, (uint8_t*)("\rFound\n"), strlen("\rFound\n"), HAL_MAX_DELAY);
}
}
/* USER CODE END 3 */
}