Hello, We have ported the FreeBSD USB stack to my employers proprietary RTOS. The code was taken from the MAIN branch a little while after RELENG_8_BP tag was created.
I'm trying to read data from the following mass storage device umass0: ehci0: [FILTER+ITHREAD] usbus0: EHCI version 1.0 usbus0: 480Mbps High Speed USB v2.0 ugen0.1: <Intel EHCI root HUB> at usbus0 uhub0: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0 uhub0: 2 ports with 2 removable, self powered ugen0.2: <vendor 0x8087 product 0x0024> at usbus0 uhub1: <vendor 0x8087 product 0x0024, class 9/0, rev 2.00/0.00, addr 2> on usbus0 uhub1: 8 ports with 8 removable, self powered ugen0.3: <ATP Electronics ATP IG eUSB> at usbus0 umass0: <ATP Electronics ATP IG eUSB, class 0/0, rev 2.00/11.00, addr 3> on usbus0 umass0: SCSI over Bulk-Only; quirks = 0x4800 Reading data one frame per transfer works. For example, if I want to read 512 bytes that is physically contiguous and is placed in a single frame, that works fine. However, when attempting to read 1024 bytes, that is not physically contiguous, using 3 frames for the same transfer, I get USB_ERR_STALLED. I have the frames setup as follows: frame[0] = 200 bytes frame[1] = 512 bytes frame[2] = 312 bytes Here's what my code looks like to do this: usb_frcount_t frindex = 0; for ( Storage::Byte_device::Scatter_gather *sg_entry = scb->SC_SG_List->In_progress_SGs(); sg_entry; sg_entry=sg_entry->SG_Link ) { usbd_xfer_set_frame_data( xfer, frindex++, reinterpret_cast<void *>(sg_entry->SG_Virtual_address), sg_entry->SG_Length ); } usbd_xfer_set_frames(xfer, frindex); usbd_transfer_submit(xfer); Note, in usbd_transfer_setup, I have set the maximum number of frames to 128 for this transfer (UMASS_T_BBB_DATA_READ). Question: Is it possible to transfer 1024 bytes using the method described above? Thanks Aman -- View this message in context: http://freebsd.1045724.n5.nabble.com/Reading-1024-bytes-from-mass-storage-device-using-3-frames-gives-USB-ERR-STALLED-tp5785167.html Sent from the freebsd-usb mailing list archive at Nabble.com. _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"