这样配置USART3有什么问题，

只看该作者 · 2016-7-11 08:30

void USART_Config(void)
{

   GPIO_InitTypeDef GPIO_InitStructure; //ÉùÃ÷GPIO³õÊ¼»¯½á¹¹Ìå
USART_InitTypeDef USART_InitStructure; //ÉùÃ÷USART³õÊ¼»¯½á¹¹Ìå
   NVIC_InitTypeDef NVIC_InitStructure;

   /*GPIOA Periph clock enable*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/*USART3 Periph clock enable*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

   USART_InitStructure.USART_BaudRate = Baud; //²¨ÌØÂÊÉèÖÃ
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    /* Configure USART3 */
    USART_Init(USART3, &USART_InitStructure);

   /* Enable USART3 Receive and Transmit interrupts */
   USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); //Ê¹ÄÜ½ÓÊÕÖÐ¶Ï
    USART_ITConfig(USART3, USART_IT_TC,  ENABLE); //·¢ËÍÖÐ¶Ï£¬·¢ËÍÍê³ÉÖ®ºó½øÈëÖÐ¶Ï

/* Configure USART3 Tx (PB.10) as alternate function open-drain */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //ÅäÖÃTXËùÔÚµÄPB10¹Ü½Å
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //ÕâÀï²»ÄÜ´í
    GPIO_Init(GPIOB, &GPIO_InitStructure);

   /* Configure USART3 Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;//Ê¹ÄÜGPIOÊ±ÖÓ£¬RS485¿ØÖÆCTRÏßÒ²ÔÚÕâÀïÊ¹ÄÜ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//Usart3 NVIC ÅäÖÃ
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇÀÕ¼ÓÅÏÈ¼¶3
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×ÓÓÅÏÈ¼¶3
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ
   NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷

/* Enable the USART3 */
    USART_Cmd(USART3, ENABLE);//Ê¹ÄÜUSART3
}

void USART_SendDataString(u8 *dataSource)
{
   isUsartBusy = 1;//±íÊ¾ÕýÔÚ·¢ËÍ
   PtrBuf = dataSource;
USART_ClearFlag(USART3, USART_FLAG_TC);//Çå³ý´«ÊäÍê³É±êÖ¾Î»£¬·ñÔò¿ÉÄÜ¶ªÊ§µÚÒ»¸ö×Ö½Ú
   USART_SendData(USART3, PtrBuf[BufferDataNum++]);//·¢ËÍÒ»¸ö×Ö½Ú
}