stef wrote: > Hello, > surely be some timing issue. When reading data, especially scanned > data, you > sometime have to wait for it being available before reading it. USB logs > don't have a timestamp, which hide all possible idle waits. > Sometimes there is a read before that gives the available data count.
No that's not possible. a) I accessed the scanner with a perl script. It's much slower than C. b) I sent the data from the log which was a bulk of 512 bytes. This gives additional delay. Maybe it's therefore a 512 byte block to slow it down a bit when accessing it at full speed. c) I used benoit's usbsnoop and the log HAS timestamps shown in milliseconds. The delay time in log is below 1 ms. d) NO read is shown before in the log with data count. The data count is always 1 with that request. You can have a look at the logs at http://www.juergen-ernst.de/info_sane.html First bulk_write is at URB 7. Return value is 0x81. -- Ciao J?rgen Microsoft is not the answer. Microsoft is the question. "NO" is the answer.
