STM32F030F4的USART2有谁用过？还有USART1用了就不能使用I2C了？

SunnyD 提问时间：2016-7-13 17:53 /

我USART1配置好了能通信，但是按同样方式配置USART2就不能通信？不知道是什么问题。还有个问题如果串口USART1占用了 I2C1是不是就不能用了引文都在PA9 和PA10上。
代码下面：
void USART1_uConfiguration(void)
{
      GPIO_InitTypeDef GPIO_uInitStructure;
      USART_InitTypeDef  USART_uInitStructure;

      // USART1_TX -> PA9
  // USART1_RX -> PA10
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_1);
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);

      GPIO_uInitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
      GPIO_uInitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_uInitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_uInitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_uInitStructure.GPIO_Speed = GPIO_Speed_50MHz;  // 50M
      GPIO_Init(GPIOA,&GPIO_uInitStructure);

      USART_uInitStructure.USART_BaudRate = 115200;
      USART_uInitStructure.USART_Parity = USART_Parity_No;
      USART_uInitStructure.USART_StopBits = USART_StopBits_1;
      USART_uInitStructure.USART_WordLength = USART_WordLength_8b;
      USART_uInitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      USART_uInitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_Init(USART2,&USART_uInitStructure);

      USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);

  USART_Cmd(USART2,ENABLE);
}

void NVIC_uConfiguration(void)
{
  NVIC_InitTypeDef       NVIC_InitStructure;

  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void USART1_RecTask(void)
{
      INT8U ubTemp = 0;

      if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET)
      {
            ubTemp = USART_ReceiveData(USART2);
            USART_SendData(USART2,ubTemp);
            while(USART_GetFlagStatus(USART2,USART_FLAG_TC) != SET);
      }
}