void USART1_Initialise(u32 bound)
{
        //GPIO端口设置
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
        //USART1_TX   PA.9
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        //USART1_RX      PA.10
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
        GPIO_Init(GPIOA, &GPIO_InitStructure);  

        //Usart1 NVIC 配置

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        //

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
        NVIC_Init(&NVIC_InitStructure);    //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART1

        //USART 初始化设置

        USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
        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;

        USART_Init(USART1, &USART_InitStructure);


        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断

        USART_Cmd(USART1, ENABLE);                    //使能串口 

}
void USART2_Initialise( u32 bound )
{
    GPIO_InitTypeDef GPIO_InitStructure;//I/O?ú3?ê??ˉ?á11ì?
    NVIC_InitTypeDef NVIC_InitStructure;//?D??3?ê??ˉ?á11ì?
    USART_InitTypeDef USART_InitStructure;//′??ú3?ê??ˉ?á11ì?  
    
    /* Enable the USART2 Pins Software Remapping */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_AFIO, ENABLE); 
    
    /* Configure USART2 Rx (PA.03) as input floating */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    /* Configure USART2 Tx (PA.02) as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    /* Enable the USART2 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);    
    
    USART_InitStructure.USART_BaudRate = bound;                
    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;      
    
    USART_Init(USART2, &USART_InitStructure);
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    /* Enable USART2 */
    USART_Cmd(USART2, ENABLE);
}

void USART2_IRQHandler(void)  
{  
     if(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)  
        {       
                    //USART_SendData(USART2, USART_ReceiveData(USART2));             
        }   

} 

void USART1_IRQHandler(void)                    //串口2中断服务程序
{
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)   
    {

    }

}