On Fri, 27 Jan 2012, Klaus Rudolph wrote:
> Hi Alan,
>
> > Are you sure you didn't lose a SETUP packet?
>
> I am not shure in anything in the moment :-) Is that right that a
> setup packet should have a length of 8 so that they could copied to a
> usb_ctrlrequest structure?
Yes.
> But "my" packet received on Ep0 after
> enumeration has a length of 24 bytes.
>
> I captured that packet with wireshark:
>
> 2 82 39.150590 host 3.0 USB URB_CONTROL out
> 3
> 4 Frame 82: 88 bytes on wire (704 bits), 88 bytes captured (704 bits)
> 5 Arrival Time: Jan 27, 2012 08:34:36.568664000 CET
> 6 Epoch Time: 1327649676.568664000 seconds
> 7 [Time delta from previous captured frame: 0.000080000 seconds]
> 8 [Time delta from previous displayed frame: 0.000080000 seconds]
> 9 [Time since reference or first frame: 39.150590000 seconds]
> 10 Frame Number: 82
> 11 Frame Length: 88 bytes (704 bits)
> 12 Capture Length: 88 bytes (704 bits)
> 13 [Frame is marked: False]
> 14 [Frame is ignored: False]
> 15 [Protocols in frame: usb]
> 16 USB URB
> 17 URB id: 0x00000000e6ce7180
> 18 URB type: URB_SUBMIT ('S')
> 19 URB transfer type: URB_CONTROL out (0x02)
> 20 Endpoint: 0x00
> 21 Device: 3
> 22 URB bus id: 6
> 23 Device setup request: relevant (0)
> 24 Data: present (0)
> 25 URB sec: 1327649676
> 26 URB usec: 568664
> 27 URB status: Operation now in progress (-EINPROGRESS) (-115)
> 28 URB length [bytes]: 24
> 29 Data length [bytes]: 24
> 30 [Response in: 83]
> 31 [bInterfaceClass: CDC_DATA (0x0a)]
> 32 URB setup
> 33 bmRequestType: 0x21
> 34 0... .... = Direction: Host-to-device
> 35 .01. .... = Type: Class (0x01)
> 36 ...0 0001 = Recipient: Interface (0x01)
> 37 bRequest: 0
> 38 wValue: 0x0000
> 39 wIndex: 0
> 40 wLength: 24
> 41 Leftover Capture Data: 020000001800000001000000010000000000000040060000
> 42
> 43 0000 80 71 ce e6 00 00 00 00 53 02 00 03 06 00 00 00 .q......S.......
> 44 0010 8c 53 22 4f 00 00 00 00 58 ad 08 00 8d ff ff ff .S"O....X.......
> 45 0020 18 00 00 00 18 00 00 00 21 00 00 00 00 00 18 00 ........!.......
> 46 0030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 47 0040 02 00 00 00 18 00 00 00 01 00 00 00 01 00 00 00 ................
> 48 0050 00 00 00 00 40 06 00 00 ....@...
This means that the host thinks it sent an 8-byte SETUP packet followed
by a 24-byte data-OUT packet.
> And as I told you, I have no idea where to put that packet?
Most likely, the SETUP packet _was_ sent and either your hardware or
your driver lost it.
Alan Stern
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