On Tuesday 29 March 2005 04:16 pm, jklaas wrote: > I have another question that I don't quite understand. With the FM Radio > the TransferBufferLength in the URB going down is usually either 0x16 or > 0xca. The URB coming back has the TransferBufferLength is 0x06. I > guess I don't quite understand why they're different.
In one direction (OUT or "goind down" in sniffusb's terminology), the length of the buffer depends on the size of the command that you are sending to the device. On the way back (IN or "going back"), the size tells how may bytes were sent back by the device as a response to the received command. Assuming that you don't have a description of those commands, the trick is to figure out what they mean (and the responses). This link may give you more insight in reverse engineering a USB device driver: http://www.toth.demon.co.uk/usb/reverse-0.2.txt J. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
