why UART is not working in STM32 nucleo 144 Board? - stm32

Question

I am using Nucleo L552ZE-Q Board and Realterm terminal,but after debugging, terminal is blank.Here with I have attached the code.It shows no error and no warnings,Led is toggling.I am using LPUART1,Baudrate 115200 bits/s. Any help would be appreciated.Thank you
enter code here
#include "main.h"
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef hlpuart1;
DMA_HandleTypeDef hdma_lpuart1_rx;
RTC_HandleTypeDef hrtc;
/* USER CODE BEGIN PV */
uint8_t myTXData[13]="Hello all \n";
uint8_t myRXData[11];
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_RTC_Init(void);
static void MX_LPUART1_UART_Init(void);
int main(void)
{
/* 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_RTC_Init();
MX_LPUART1_UART_Init();
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_UART_Transmit(&hlpuart1,myTXData,13,10);
HAL_GPIO_TogglePin(LED_GREEN_GPIO_Port,LED_GREEN_Pin);
HAL_Delay(500);
}
/* USER CODE END 3 */
}
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