UEFI 下查找USB设备

/**
  The user Entry Point for Application. The user code starts with this function
  as the real entry point for the application.

  @param[in] ImageHandle    The firmware allocated handle for the EFI image.  
  @param[in] SystemTable    A pointer to the EFI System Table.
  
  @retval EFI_SUCCESS       The entry point is executed successfully.
  @retval other             Some error occurs when executing this entry point.

**/
EFI_STATUS
EFIAPI
UefiMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
    EFI_STATUS          Status;
    EFI_USB_IO_PROTOCOL *UsbIo;
    UINTN 		HandleIndex, NumHandles;
    EFI_HANDLE 	*ControllerHandle = NULL;
    
    //
    EFI_USB_DEVICE_DESCRIPTOR Device;
    
    gST->ConOut->OutputString (gST->ConOut, L"---------------------------------\r\n");
        
    gST->ConOut->ClearScreen(gST->ConOut);

    gST->ConOut->EnableCursor(gST->ConOut,TRUE);

    Status = gBS->LocateHandleBuffer(
            ByProtocol,
            &gEfiUsbIoProtocolGuid,
            NULL,
            &NumHandles,
            &ControllerHandle);    

    
  if (EFI_ERROR (Status)) {
     Print (L"gEfiUsbIoProtocolGuid err 0\r\n"); 
     
    //gST->ConOut->ClearScreen(gST->ConOut);

    //gST->ConOut->EnableCursor(gST->ConOut,TRUE);
    
    return Status;
  }
  
  Print (L"USB NumHandles : %d\r\n",NumHandles);
  
  for (HandleIndex = 0; HandleIndex < NumHandles; HandleIndex++)  
  {
    Status = gBS->OpenProtocol(
            ControllerHandle[HandleIndex],
            &gEfiUsbIoProtocolGuid, 
            (VOID**)&UsbIo,
            gImageHandle,
            NULL,
            EFI_OPEN_PROTOCOL_GET_PROTOCOL
            );		
    if (EFI_ERROR(Status)) {
        continue;
    } 
    
    //
    if (!IsUSBKeyboard (UsbIo)) 
    {
      Status = EFI_UNSUPPORTED;
    }
    
    //
    Status = UsbIo->UsbGetDeviceDescriptor ( UsbIo, &Device );
    if (EFI_ERROR ( Status )) {
    	Status = EFI_UNSUPPORTED;
    }
    else
    {
        //Device.IdVendor    Device.IdProduct
        Print(L"USB HandleIndex:%d VID:%04X PID:%04X\r\n",HandleIndex,Device.IdVendor,Device.IdProduct);
        
        if((0x17EF == Device.IdVendor) && (0x60C1 == Device.IdProduct))
        {
          //
          gBS->Stall(1000*800);  //800ms Delay
        }
    }
    
    
   gBS->CloseProtocol (
         ControllerHandle[HandleIndex],
         &gEfiUsbIoProtocolGuid,
         gImageHandle,
         NULL
         );
  }
  
  return EFI_SUCCESS;
}

附带自己调试build 出的 .efi 执行文件 

https://download.csdn.net/download/mini92/10334027