GPIO_InitTypeDef GPIO_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

 USART_InitTypeDef USART_InitStructure;

USART_ClockInitTypeDef USART_CLK_InitStructure;

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE );

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

/* Configure USART1 Rx (PA10) as input floating */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

GPIO_Init( GPIOA, &GPIO_InitStructure );

/* Configure USART1 Tx (PA9) as alternate function push-pull */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init( GPIOA, &GPIO_InitStructure );

/*-----------中断组初始化----------------------------------*/

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_LOWEST_INTERRUPT_PRIORITY;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init( &NVIC_InitStructure );        

USART_InitStructure.USART_BaudRate = 115200;                     //波特率初始化

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_CLK_InitStructure.USART_Clock = USART_Clock_Disable;

//        USART_CLK_InitStructure.USART_CPOL = USART_CPOL_Low;

//        USART_CLK_InitStructure.USART_CPHA = USART_CPHA_2Edge;

//        USART_CLK_InitStructure.USART_LastBit = USART_LastBit_Disable;

USART_Init( USART1, &USART_InitStructure );

//        STM_EVAL_COMInit(COM1, &USART_InitStructure);

//        USART_ClockInit( USART1, &USART_CLK_InitStructure);

USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );

USART_Cmd( USART1, ENABLE );

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

void Uart1_Char(unsigned char  ch)

{

    USART1->DR = ch;

    while((USART1->SR & 0x40)==0);

}

void USARTx_IRQHANDLER(void)

 {

   if(USART_GetITStatus(EVAL_COMX, USART_IT_RXNE) != RESET)

  {

     /* Read one byte from the receive data register */

     RxBuffer[RxCounter++] = (USART_ReceiveData(EVAL_COMX) & 0x7F);

     if(RxCounter == NbrOfDataToRead)

    {

      /* Disable the EVAL_COMX Receive interrupt */

       USART_ITConfig(EVAL_COMX, USART_IT_RXNE, DISABLE);

     }

   }

   if(USART_GetITStatus(EVAL_COMX, USART_IT_TXE) != RESET)

   {

     /* Write one byte to the transmit data register */

    USART_SendData(EVAL_COMX, TxBuffer[TxCounter++]);

     if(TxCounter == NbrOfDataToTransfer)

     {

     /* Disable the EVAL_COMX Transmit interrupt */

     USART_ITConfig(EVAL_COMX, USART_IT_TXE, DISABLE);

    }

   }

 }