Hi, On Wed, Jan 23, 2013 at 07:17:44PM +0800, victor yeo wrote: > >> >> In fsg_dev structure, there are 3 usb_ep: bulk_in, bulk_out, and > >> >> intr_in. Why is the intr_out endpoint not defined? > >> > > >> > because it's not needed. Read the USB Mass Storage Class specification > >> > from usb.org > >> > >> Ok. In the gadget driver, it keeps on receiving the same bulk_out > >> data, maybe because the data is not processed. The get_next_command is > >> not called. > >> > >> g_file_storage gadget: bulk-out, length 31: > >> 00000000: 55 53 42 43 38 b5 ea 86 24 00 00 00 80 00 06 12 > >> 00000010: 00 00 00 24 00 00 00 00 00 00 00 00 00 00 00^C > >> g_file_storage gadget: bulk_out_complete --> 0, 31/0 > >> > >> Is it because the bh->bulk_out_intended_length is 0? > > > > that data is a CBW. But aparently gadget driver queued 0-bytes, why did > > you unload data if req->length was zero ? > > > > another bug in your udc driver > > In my udc driver, i set the req->length to the number of bytes i > received from HW, which is 31 bytes. Is it necessary to do that? How you shouldn't touch req->lenght, you should only update req->actual. req->length is readonly for the UDC. > to know the gadget driver queued 0-bytes? By > bh->bulk_out_intended_length ? read req->length -- balbi
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