[Ftdi-usb-sio-devel] FT232AM/BM Vendor_Device: Request 90

[John W. <joh...@wi...>]

Hi All,

I'm working through pages of SnoopyPro output, trying to work out
how my ftdi-based device works under Windows.

Most of the traces make sense, but on startup a lot of 
URB_FUNCTION_VENDOR_DEVICE urbs are sent down with small
responses back.  Examination of the returning urbs suggests
it's getting the product and vendor strings.

Example:
00000132	0.02340018	>>>>>>> URB 5 going down...	
00000133	0.02340493	-- URB_FUNCTION_VENDOR_DEVICE:	
00000134	0.02341275	  TransferFlags          = 00000003
(USBD_TRANSFER_DIRECTION_IN, USBD_SHORT_TRANSFER_OK)	
00000135	0.02341890	  TransferBufferLength = 00000002	
00000136	0.02342588	  TransferBuffer       = f403bbb2	
00000137	0.02343063	  TransferBufferMDL    = 00000000	
00000138	0.02343594	  UrbLink                 = 00000000	
00000139	0.02344069	  RequestTypeReservedBits = 00	
00000140	0.02344572	  Request                 = 90 <<<HERE
00000141	0.02345075	  Value                   = 0000	
00000142	0.02345577	  Index                   = 0001	


Does this mean Request 90 is some type of 'get memory
location' request?  Can anyone confirm this and what the
full structure of the request urb for it is?

Thanks

jw