[avrdude-dev] Native USB support for JTAG ICE mkII added

[Joerg Wunsch]

I just added native USB support for the JTAG ICE mkII, done via
libusb.  Find the CVS commit message below.

I saw on SourceForge, there's also a Win32 implementation of libusb,
so perhaps this would even help the Win32 users.  Inclusion of USB
support is being auto-configured, provided usb_open() could be found
in an existing instance of libusb.  Alternatively, someone
understanding USB on Win32 might clone my libusb implementation, and
come up with a different Win32 implementation as well.

Note for *BSD users: the current port of libusb contains an error for
control transfers that causes a short reply to be ignored.
Consequently, the serial number matching won't work there as the
serial number is a string attribute that needs to be fetched from the
ICE by means of a control transfer.  Find a patch attached (already
supplied to the maintainer of the FreeBSD port).

It takes me about 13 seconds to read the full flash area of an
ATmega128 via USB.


CVS log message:

Implement and document a libusb-based USB transport for the JTAG ICE
mkII.

The serial transport methods have been moved out into a record of
function pointers for that purpose, defaulting to the actual serial
connection that natively applies to the hosting system.  Iff inside
the JTAG ICE mkII handler a port name starting with "usb" has been
detected, the record of function pointers is switched to USB.
Optionally, a serial number might be specified, so only the JTAG ICE
mkII matching the given serial number will be opened.  The match is
done right-to-left, so only the least significant bytes of the serial
number need to be given.

In order to make the change as least intrusive to existing drivers as
possible, the entire naming scheme of the serial_foo() function entry
points has been maintained as access macros that encapsulate these
into the respective indirect function calls via serdev->foo().

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

patch-bsd.c
Description: Text document