Hi, On Wed, Jan 23, 2013 at 06:04:55PM +0800, victor yeo wrote: > Hi, > > >> >> >> Ok, rephrase the question, is this the flow for bulk transfer? > >> >> >> > >> >> >> 1) data is received by Usb mass storage HW, the UDC driver ISR is > >> >> >> called to read the data to usb_request buffer > >> >> >> 2) bulk_out_complete() in gadget driver, is called to set buffer state to full > >> >> >> 3) get_next_command() in gadget driver, is called to read the CBW. > >> >> >> 4) do_scsi_command() to process SCSI command encoded in CBW > >> >> >> 5) send_status() sends the CSW to host > >> >> > > >> >> > Something like below: > >> >> > > >> >> > OUT Token -> ISR -> giveback() -> bulk_out_complete() -> > >> >> > get_next_command() -> do_scsi_command() -> usb_ep_queue() -> OUT/IN > >> >> > Token -> ISR -> bulk_out_complete() -> send_status() > >> >> > >> >> For the IN Token, i will just write the data to the HW buffer, and the > >> >> flow will go to send_status(). > >> >> > >> >> I use a different USB cable, now the USB gadget is able to receive > >> >> bulk transfer data from host PC. I am working on the bulk transfer > >> >> code. Thank you for the very useful answers. > >> > > >> > np > >> > >> 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 -- balbi
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