I did some searching of the mailing list archives and was not able to
find the answer on this - how can one arrange to explicitly address
more than one FT2232 based JTAG interface device on USB ? (OK, this
is solved below, but leads to another question.)
Specifically, I have an AMontec JTAGKey ( http://www.amontec.com/jtagkey.shtml
) and also a JTAGKey Tiny: ( http://www.amontec.com/jtagkey-
tiny.shtml ) and would like to be able to run two instances of OpenOCD
in order to be able to communicate with both of them.
Is there a more precise way to specify in the config file which
physical interface to bind to ? With the JTAGKey Tiny I currently use
these lines:
#############################################################################
# Interface configuration
#############################################################################
interface ft2232
ft2232_device_desc "Amontec JTAGkey"
ft2232_layout jtagkey
ft2232_vid_pid 0x0403 0xCFF8
but plainly this would match up against any such device on the USB bus.
OK, some googling indicates that there is a unique serial number per
JTAGKey device:
http://forum.sparkfun.com/viewtopic.php?p=31625&sid=2fdb8f7dfe577c1cc4ff0f2b21e0e69f
http://forum.sparkfun.com/viewtopic.php?t=9273&sid=2571180fc8627d9034536f195a7cb354
Aha, running USB Prober on OS X shows me the SN/info of my two
interfaces ("abcdef" injected in case those are supposed to be secret):
Descriptor Version Number: 0x0200
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol: 0
Device MaxPacketSize: 8
Device VendorID/ProductID: 0x0403/0xCFF8 (Future
Technology Devices International Limited)
Device Version Number: 0x0500
Number of Configurations: 1
Manufacturer String: 1 "Amontec"
Product String: 2 "Amontec JTAGkey"
Serial Number String: 3 "32abcdef"
Descriptor Version Number: 0x0200
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol: 0
Device MaxPacketSize: 8
Device VendorID/ProductID: 0x0403/0xCFF8 (Future
Technology Devices International Limited)
Device Version Number: 0x0500
Number of Configurations: 1
Manufacturer String: 1 "Amontec"
Product String: 2 "Amontec JTAGkey"
Serial Number String: 3 "T1abcdef"
OK so now I can make it work - made two config files, made sure to
pick a separate set of port numbers for each instance, and put the
right serial number into each one. This works with two instances and
I can address a device on both ports easily.
Is there any way to conditionalize the setup script so I could just
have one master script, but have it invoked with an additional command
line argument which would then guide it to select an interface and a
set of port numbers to bind to ?
Rob
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