STM32H750

 Hi.., 

 Ds code not working receive NULL value  kindly help me I'm using STM32H750VB

/* USER CODE END WHILE */

HAL_UART_Transmit(&huart2,recdata,sizeof(recdata),1000);
HAL_Delay(100);
HAL_UART_Receive(&huart2,recdata,sizeof(recdata),1000);
/* USER CODE BEGIN 3 */

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