请教下单线串口的问题

一匹夫尔提问时间：2017-9-25 10:16 /

stm32L0xx是支持单线串口的但是我无法调试出效果以下是我的程序无法接受无法发送我是在能进行正常通信的程序下修改的

main中的初始化函数
static void MX_USART2_UART_Init(void)
{

  UartHandle.Instance = USART2;
  UartHandle.Init.BaudRate = 9600;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits = UART_STOPBITS_1;
  UartHandle.Init.Parity = UART_PARITY_NONE;
  UartHandle.Init.Mode = UART_MODE_TX_RX;
  UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
  UartHandle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  UartHandle.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_HalfDuplex_Init(&UartHandle) != HAL_OK)
  {
Error_Handler();
  }
if(HAL_HalfDuplex_Init(&UartHandle) != HAL_OK)
{
      Error_Handler();
}
if(HAL_HalfDuplex_Init(&UartHandle) != HAL_OK)
{
      Error_Handler();
}
if(HAL_UART_Receive_IT(&UartHandle,(uint8_t *)&temp,1) != HAL_OK)
{
      //这一句写在main函数的while(1)上面。用于启动程序启动一次中断接收
      HAL_UART_Transmit_IT(&UartHandle, (uint8_t *)&"ERROR\r\n",7);
      while(1);
}
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)       //done
{
buff[buff_count]=temp[0];
buff_count=buff_count+1;
if(buff_count>=8)
{
      buff_count = 0;
      arg0 = buff[0];
      arg1 = buff[1];
      arg2 = buff[2];
      arg3 = buff[3];
      arg4 = buff[4];
      arg5 = buff[5];
      arg6 = buff[6];
      arg7 = buff[7];

}
memset(temp,0,8);
HAL_UART_Receive_IT(&UartHandle,(uint8_t *)&temp,1);    //重新打开串口中断
}

stm32l0xx_hal_msp.c中的函数
void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{

  GPIO_InitTypeDef GPIO_InitStruct;
  if(huart->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspInit 0 */

  /* USER CODE END USART2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_USART2_CLK_ENABLE();

/**USART2 GPIO Configuration
PA2    ------> USART2_TX
*/
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USART2 interrupt Init */
HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn);
  /* USER CODE BEGIN USART2_MspInit 1 */

  /* USER CODE END USART2_MspInit 1 */
  }

}

void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
{

  if(huart->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspDeInit 0 */

  /* USER CODE END USART2_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_USART2_CLK_DISABLE();

/**USART2 GPIO Configuration
PA2    ------> USART2_TX
*/
HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2);

/* USART2 interrupt DeInit */
HAL_NVIC_DisableIRQ(USART2_IRQn);
  /* USER CODE BEGIN USART2_MspDeInit 1 */

  /* USER CODE END USART2_MspDeInit 1 */
  }

}

中断函数
void USARTx_IRQHandler(void)
{
   HAL_UART_IRQHandler(&UartHandle);
}

在控制时使用这两句进行控制
HAL_HalfDuplex_EnableTransmitter(&UartHandle);

HAL_HalfDuplex_EnableReceiver(&UartHandle);

麻烦懂得说一下