usb的问题

只看该作者 · 2008-6-27 17:01

RESULT MASS_NoData_Setup(u8 RequestNo)
这个函数的内容  是根据什么来写的
例子：
RESULT MASS_NoData_Setup(u8 RequestNo)
{
  if ((Type_Recipient == (CLASS_REQUEST | INTERFACE_RECIPIENT))
      && (RequestNo == MASS_STORAGE_RESET) && (pInformation->USBwValue == 0)
      && (pInformation->USBwIndex == 0) && (pInformation->USBwLength == 0x00))
  {
    /* Initialize Endpoint 1 */
    ClearDTOG_TX(ENDP1);

    /* Initialize Endpoint 2 */
    ClearDTOG_RX(ENDP2);

    /*intialise the CBW signature to enable the clear feature*/
    CBW.dSignature = BOT_CBW_SIGNATURE;
    Bot_State = BOT_IDLE;

    return USB_SUCCESS;
  }
  return USB_UNSUPPORT;
}
例子2
  RESULT Joystick_Data_Setup(u8 RequestNo)
{
  u8 *(*CopyRoutine)(u16);

  CopyRoutine = NULL;

  if ((RequestNo == GET_DESCRIPTOR)
      && (Type_Recipient == (STANDARD_REQUEST | INTERFACE_RECIPIENT))
      && (pInformation->USBwIndex0 == 0))
  {

    if (pInformation->USBwValue1 == REPORT_DESCRIPTOR)
    {
      CopyRoutine = Joystick_GetReportDescriptor;
    }
    else if (pInformation->USBwValue1 == HID_DESCRIPTOR_TYPE)
    {
      CopyRoutine = Joystick_GetHIDDescriptor;
    }

  } /* End of GET_DESCRIPTOR */

  /*** GET_PROTOCOL ***/
  else if ((Type_Recipient == (CLASS_REQUEST | INTERFACE_RECIPIENT))
           && RequestNo == GET_PROTOCOL)
  {
    CopyRoutine = Joystick_GetProtocolValue;
  }

  if (CopyRoutine == NULL)
  {
    return USB_UNSUPPORT;
  }

  pInformation->Ctrl_Info.CopyData = CopyRoutine;
  pInformation->Ctrl_Info.Usb_wOffset = 0;
  (*CopyRoutine)(0);
  return USB_SUCCESS;
}