Alan Stern <stern@...> writes:
> >
> > >
> > > This error message indicates that the device cannot be used as a serial
> > > interface, since it doesn't have any bulk endpoints. So usbserial
> > > isn't the right driver for it. Also, it runs at low speed (1.5 Mb/s)
> > > and doesn't have any way to send data to the computer -- the listing
> > > below shows that it is output only.
> >
> > Bad news, I guess...?
>
> Probably. Perhaps it indicates the device doesn't need to receive any
> data from the computer. Or only minimal data, that can be wrapped up
> in a control transfer on endpoint 0.
>
Thank you, Alan!
You were right: My investigations of the usb snoop log bring up that there are
only control messages used. Even though you do not know the vendor´s USB
protocol (nor me), I hope to get some answers how the host can access the
responses of the device and how I can implement that with legancy libusb.
Here is a draft interpretation of a sample section which represents the first
of many communication sequences:
URB7:
- host sends an APL specific request packet (91 01 00 01 93) to the clock
(that´s for sure)
- device seems to respond with a setup packet?
URB 8:
- host then starts an asynchronous read (am I right?)
- device answers with the first APL-specific response packet (fore sure)
URB 9:
- host polls length of incoming data (am I right?)
- device responses with 00 0b, wich seems to be the recent uplink packet length
URB 10:
- host sends an APL specific ACK packet (a1 01 00 01 a3)
- device seems to respond with a setup packet?
[442391 ms] >>> URB 7 going down >>>
-- URB_FUNCTION_VENDOR_DEVICE:
TransferFlags = 00000000 (USBD_TRANSFER_DIRECTION_OUT,
~USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000005
TransferBuffer = 822ac210
TransferBufferMDL = 00000000
00000000: 91 01 00 01 93
UrbLink = 00000000
RequestTypeReservedBits = 00000040
Request = 00000004
Value = 00005001
Index = 00000000
[442400 ms] UsbSnoop - MyInternalIOCTLCompletion(b8da7126) : fido=00000000,
Irp=817e3008, Context=818094b0, IRQL=2
[442400 ms] <<< URB 7 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 820d2bd8
TransferFlags = 0000000a (USBD_TRANSFER_DIRECTION_OUT,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000005
TransferBuffer = 822ac210
TransferBufferMDL = 8214a840
UrbLink = 00000000
SetupPacket =
00000000: 40 04 01 50 00 00 05 00
[442400 ms] UsbSnoop - FilterDispatchAny(b8da6fd2) :
IRP_MJ_INTERNAL_DEVICE_CONTROL
[442400 ms] UsbSnoop - FdoHookDispatchInternalIoctl(b8da71ea) : fdo=81f069a0,
Irp=82073db0, IRQL=0
[442400 ms] >>> URB 8 going down >>>
-- URB_FUNCTION_VENDOR_DEVICE:
TransferFlags = 00000001 (USBD_TRANSFER_DIRECTION_IN,
~USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000fa0
TransferBuffer = 81bd6008
TransferBufferMDL = 00000000
UrbLink = 00000000
RequestTypeReservedBits = 000000c0
Request = 00000004
Value = 00005002
Index = 00000000
[442920 ms] UsbSnoop - MyInternalIOCTLCompletion(b8da7126) : fido=00000000,
Irp=82073db0, Context=818094b0, IRQL=2
[442920 ms] <<< URB 8 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 820d2bd8
TransferFlags = 0000000b (USBD_TRANSFER_DIRECTION_IN,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 0000000b
TransferBuffer = 81bd6008
TransferBufferMDL = 81b1a548
00000000: 11 07 00 1e 48 b4 98 85 be 00 0d
UrbLink = 00000000
SetupPacket =
00000000: c0 04 02 50 00 00 a0 0f
[442921 ms] UsbSnoop - FilterDispatchAny(b8da6fd2) :
IRP_MJ_INTERNAL_DEVICE_CONTROL
[442921 ms] UsbSnoop - FdoHookDispatchInternalIoctl(b8da71ea) : fdo=81f069a0,
Irp=816b2008, IRQL=0
[442921 ms] >>> URB 9 going down >>>
-- URB_FUNCTION_VENDOR_DEVICE:
TransferFlags = 00000001 (USBD_TRANSFER_DIRECTION_IN,
~USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000002
TransferBuffer = 81e88c98
TransferBufferMDL = 00000000
UrbLink = 00000000
RequestTypeReservedBits = 000000c0
Request = 00000004
Value = 0000500d
Index = 00000000
[442924 ms] UsbSnoop - MyInternalIOCTLCompletion(b8da7126) : fido=00000000,
Irp=816b2008, Context=818094b0, IRQL=2
[442924 ms] <<< URB 9 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 820d2bd8
TransferFlags = 0000000b (USBD_TRANSFER_DIRECTION_IN,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000002
TransferBuffer = 81e88c98
TransferBufferMDL = 81b78c40
00000000: 00 0b
UrbLink = 00000000
SetupPacket =
00000000: c0 04 0d 50 00 00 02 00
[443054 ms] UsbSnoop - FilterDispatchAny(b8da6fd2) :
IRP_MJ_INTERNAL_DEVICE_CONTROL
[443054 ms] UsbSnoop - FdoHookDispatchInternalIoctl(b8da71ea) : fdo=81f069a0,
Irp=816b2008, IRQL=0
[443054 ms] >>> URB 10 going down >>>
-- URB_FUNCTION_VENDOR_DEVICE:
TransferFlags = 00000000 (USBD_TRANSFER_DIRECTION_OUT,
~USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000005
TransferBuffer = 82344910
TransferBufferMDL = 00000000
00000000: a1 01 00 01 a3
UrbLink = 00000000
RequestTypeReservedBits = 00000040
Request = 00000004
Value = 00005001
Index = 00000000
[443062 ms] UsbSnoop - MyInternalIOCTLCompletion(b8da7126) : fido=00000000,
Irp=816b2008, Context=818094b0, IRQL=2
[443062 ms] <<< URB 10 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 820d2bd8
TransferFlags = 0000000a (USBD_TRANSFER_DIRECTION_OUT,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000005
TransferBuffer = 82344910
TransferBufferMDL = 81b78c40
UrbLink = 00000000
SetupPacket =
00000000: 40 04 01 50 00 00 05 00
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