[avrdude-dev] [bug #40831] LUFA AVRISP-MKII fails with avrdude 6.0.1

[Joerg Wunsch]

Update of bug #40831 (project avrdude):

                  Status:                    None => Need Info              

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Follow-up Comment #1:

It's still not quite clear to me why this happens.

The statement you quoted is only supposed to trigger if the
read endpoint number (usb.rep) has not been set by the driver
before (== 0).  An endpoint number of 0 is always reserved for
the control endpoint, and cannot be a data endpoint anyway.
Then, a (half-hearted) attempt is made inside usb_libusb.c to
pick the first data endpoint in the configuration that has the
"IN" direction bit (0x80) set, and this one is used for usb.rep.
(Arguably, this procedure still leaves a lot room for
improvements, yes.)

Can you please post a full USB descriptor from the LUFA
firmware?

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