我用的是单片机自带的USB固件库函数
用到的如下：
void Get_Report (void)
{
        unsigned char test[] = {0x01, 0x02, 0x03, 0x04};
   // call appropriate handler to prepare buffer
   ReportHandler_IN_ISR(SETUP.wValue.c[LSB]);
   // set DATAPTR to buffer used inside Control Endpoint

        DATAPTR = test;
        DATASIZE = SETUP.wLength.c[LSB];
   /*
   DATAPTR = IN_BUFFER.Ptr;
   DATASIZE = IN_BUFFER.Length;
   */
   if (EP_STATUS[0] != EP_STALL)
   {
          // Set serviced SETUP Packet
      POLL_WRITE_BYTE (E0CSR, rbSOPRDY);
      EP_STATUS[0] = EP_TX;            // Endpoint 0 in transmit mode
      DATASENT = 0;                    // Reset DATASENT counter
   }
}

中断里面的处理是这样的
Fifo_Write_InterruptServiceRoutine (FIFO_EP0, DATASIZE, (unsigned char*)DATAPTR);
ControlReg |= rbDATAEND;// Add Data End bit to bitmask
EP_STATUS[0] = EP_IDLE; // Return EP 0 to idle state

还有发送函数
void Fifo_Write_InterruptServiceRoutine (unsigned char addr, unsigned int uNumBytes, unsigned char * pData)
{
   int i;

   // If >0 bytes requested,
   if (uNumBytes)
   {
      while (USB0ADR & 0x80);          // Wait for BUSY->'0'(register available)
      USB0ADR = (addr);                // Set address (mask out bits7-6)

      // Write <NumBytes> to the selected FIFO
      for (i=0; i<uNumBytes; i++)
      {
         USB0DAT = pData[i];
         while (USB0ADR & 0x80);       // Wait for BUSY->'0' (data ready)
      }
   }
}

流程是接收到get_report命令后进入函数，然后进入中断，再fifo_write发送出去
可我接收到的数据不对，只有00和DATASIZE
想问下是什么原因呢？