更改1：

void USB_To_USART_Send_Data(u8* data_buffer, u8 Nb_bytes)

{

//polling ?

/* 原来官方的例程：这里使用查询的方式把USB 接收到的数据发送出去

  u32 i; 

 

  for (i = 0; i < Nb_bytes; i++)

  {

    USART_SendData(USART1, *(data_buffer + i));

    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

  }  */

 

//int: 改进的处理：使用队列加缓冲加中断来处理USB 接收到的数据

  Uart1SendPushBuf(data_buffer, Nb_bytes);

}

 

更改2：

void USART_To_USB_Send_Data(void)        //CALLED by int?

{//write data to END-point

 //called by uart_rxe_int:

 

  u16 i,j;

 

  if (linecoding.datatype == 7)

  { 

    //buffer_in[count_in] = USART_ReceiveData(USART1) & 0x7F;

       usb_buf[usbIdIn] = USART_ReceiveData(USART1) & 0x7F;

  }

  else if (linecoding.datatype == 8)

  {

    //buffer_in[count_in] = USART_ReceiveData(USART1);

       usb_buf[usbIdIn] =  USART_ReceiveData(USART1);

  }

 

  if(++usbIdIn>=2048)usbIdIn=0;

  usb_len ++;

  

  //if usb -in_enp free now? start send?

  if(  count_in == 0 )

  {//free now? start send...

// 每次传输不要超过指定的缓冲长度，

        if(usb_len > VIRTUAL_COM_PORT_DATA_SIZE)

       {  

         j=VIRTUAL_COM_PORT_DATA_SIZE;

         usb_len -=j;

       }

       else

       {

         j=usb_len;

         usb_len =0;

       }

 

    for(i=0;i<j;i++)

       {

         buffer_in = usb_buf[usbIdOut];

         if(++usbIdOut>=2048)usbIdOut=0;

       }

 

       count_in = j;

 

       UserToPMABufferCopy(buffer_in, ENDP1_TXADDR, count_in);

    SetEPTxCount(ENDP1, count_in);

    SetEPTxValid(ENDP1);

  }

  //else just save to buffer,waiting usb-nak

 

}