en basit şekilde 18f2550 ile usb kontrolü

Device = 18F2550 
  XTAL = 48	 
  USB_DESCRIPTOR = "USBProjectDESC.inc" 
  Symbol USBBufferSizeMax = 8 
  Symbol USBBufferSizeTX  = 8 
  Symbol USBBufferSizeRX  = 8 
  Dim    USBBuffer[USBBufferSizeMax] As Byte 
  Dim PP0 As Byte SYSTEM        ' USBPOLL status return 
  Symbol CARRY_FLAG = STATUS.0  ' high if microcontroller does not have control over the buffer 
  Symbol ATTACHED_STATE = 6     ' is USB attached 
   
  TRISB = %00000000 
  GoSub AttachToUSB 
  ProgramLoop: 
   
     USBBuffer[2] = PORTA 
     USBOut 1, USBBuffer, USBBufferSizeTX 
      
     USBIn 1, USBBuffer, USBBufferSizeRX, ProgramLoop 
     PORTB = USBBuffer[3] 
         
     GoTo ProgramLoop 
    
  DoUSBIn: 
     USBIn 1, USBBuffer, USBBufferSizeRX, DoUSBIn 
     Return 
   
  DoUSBOut:    
     USBOut 1, USBBuffer, USBBufferSizeTX, DoUSBOut 
     Return 
   
  AttachToUSB: 
     Repeat								 
        USBPoll		 
     Until PP0 = ATTACHED_STATE 
     Return	

' vendor and product IDs 
  Private Const VendorID = 6114 
  Private Const ProductID = 2010 
   
  ' read and write buffers 
  Private Const BufferInSize = 8 
  Private Const BufferOutSize = 8 
  Dim BufferIn(0 To BufferInSize) As Byte 
  Dim BufferOut(0 To BufferOutSize) As Byte 
   
  Private Sub Command1_Click() 
   
  BufferOut(4) = Val(Text1.Text) 
  hidWriteEx VendorID, ProductID, BufferOut(0) 
  End Sub 
   
   
  Private Sub Form_Load() 
     ' do not remove! 
     ConnectToHID (Me.hwnd) 
  End Sub 
   
  Private Sub Form_Unload(Cancel As Integer) 
     DisconnectFromHID 
  End Sub 
   
  Public Sub OnPlugged(ByVal pHandle As Long) 
     If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then 
        ' ** YOUR CODE HERE ** 
     End If 
  End Sub 
   
  Public Sub OnUnplugged(ByVal pHandle As Long) 
     If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then 
        ' ** YOUR CODE HERE ** 
     End If 
  End Sub 
   
  Public Sub OnChanged() 
     Dim DeviceHandle As Long 
     
     DeviceHandle = hidGetHandle(VendorID, ProductID) 
     hidSetReadNotify DeviceHandle, True 
  End Sub 
   
  Public Sub OnRead(ByVal pHandle As Long) 
      
     ' read the data (don't forget, pass the whole array)... 
     If hidRead(pHandle, BufferIn(0)) Then 
        
     End If 
  End Sub 
   
   
  Public Sub WriteSomeData() 
     BufferOut(0) = 0   ' first by is always the report ID 
     BufferOut(1) = 10  ' first data item, etc etc 
      
     ' write the data (don't forget, pass the whole array)... 
     hidWriteEx VendorID, ProductID, BufferOut(0) 
  End Sub 
    
  Private Sub Text1_Change() 
  If Val(Text1.Text) > 255 Then Text1.Text = "" 
  End Sub 
   
  Private Sub Text1_KeyPress(KeyAscii As Integer) 
  If KeyAscii = 8 Then Exit Sub 
  If IsNumeric(Chr(KeyAscii)) = False Then KeyAscii = 0 
  End Sub