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使用stm32CubemX进行配置如下图所示：

生成的代码如下：

/*** @brief This function handles DMA1 channel6 global interrupt.*/
void DMA1_Channel6_IRQHandler(void)
{/* USER CODE BEGIN DMA1_Channel6_IRQn 0 *//* USER CODE END DMA1_Channel6_IRQn 0 */HAL_DMA_IRQHandler(&hdma_usart2_rx);/* USER CODE BEGIN DMA1_Channel6_IRQn 1 *//* USER CODE END DMA1_Channel6_IRQn 1 */
}/*** @brief This function handles DMA1 channel7 global interrupt.*/
void DMA1_Channel7_IRQHandler(void)
{/* USER CODE BEGIN DMA1_Channel7_IRQn 0 *//* USER CODE END DMA1_Channel7_IRQn 0 */HAL_DMA_IRQHandler(&hdma_usart2_tx);/* USER CODE BEGIN DMA1_Channel7_IRQn 1 *//* USER CODE END DMA1_Channel7_IRQn 1 */
}

板级配置如下：

  /* USER CODE BEGIN USART2_MspDeInit 0 *//* USER CODE END USART2_MspDeInit 0 *//* Peripheral clock disable */__HAL_RCC_USART2_CLK_DISABLE();/**USART2 GPIO ConfigurationPA2     ------> USART2_TXPA3     ------> USART2_RX*/HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2|GPIO_PIN_3);/* USART2 DMA DeInit */HAL_DMA_DeInit(huart->hdmarx);HAL_DMA_DeInit(huart->hdmatx);/* USART2 interrupt DeInit */HAL_NVIC_DisableIRQ(USART2_IRQn);/* USER CODE BEGIN USART2_MspDeInit 1 *//* USER CODE END USART2_MspDeInit 1 */