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HAL UART IT stm32f091RB

Question asked by amaini.rafik on Dec 31, 2014
for starters, I'm a beginner. So I want to use UART of STM32F091RB and for this I used STM32CUBEMX, and I found much difficulty, so I'll ask my questions.
in my program I do not know when I will receive data from UART, so the program works and I want when I receive a data I'm going to treat it, so I used the interreption
GPIO_InitTypeDef GPIO_InitStruct;
 /* USER CODE END USART3_MspInit 0 */
   /* Peripheral clock enable */
   /**USART3 GPIO Configuration   
   PC4     ------> USART3_TX
   PC5     ------> USART3_RX
   GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull = GPIO_PULLUP;
   GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
   GPIO_InitStruct.Alternate = GPIO_AF1_USART3;
   HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 /* System interrupt init*/
   HAL_NVIC_SetPriority(USART3_8_IRQn, 0, 0);

Now I want to know what I should do after that and told me to préferanc, how routine switches the program when the MCU recoi a data, when in IT mode.

excuse me for my bad english and Happy New Year