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

[Colin O'Flynn]

Hi Dean/Joerg,

Keeping my reply on the list & not bugtracker as not directly related to
that bug:

Do you think it's worth fixing the issue forcing the separate endpoints?
AFAIK the issue is triggered by a call to usbdev_drain() which might be
possible to work around (read: just disable for avr-isp2).

I only ask as if this is fixed it might add another complication to the
system, and I don't know if it would become worth making two separate
AVR-ISPmk2 programmers at that point. One has the 'libusb' fixes and assumes
the two separate endpoints, (i.e. called avrisp2lufa or whatever), one
always assumes endpoints are as in Atmel AVRISP-MK2.

I assume it would be possible to differentiate between the 3 programmers and
enable the correct code (i.e.: Atmel AVR-ISPMK2, LUFA AVR-ISPMK2 in
AVRStudio Mode, LUFA AVR-ISPMK2 in LIBUSB Mode). But it might become a
ungainly/difficult to maintain into the future, and ultimately be easier at
some point in time say screw it to the users, and make them specify exactly
what they want.

Regards,

  -Colin O'Flynn



-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Dean
Camera
Sent: September-13-14 4:54 AM
To: Dean Camera; Larry Viesse; Joerg Wunsch; Ron Snijders;
address@hidden
Subject: [avrdude-dev] [bug #40831] LUFA AVRISP-MKII fails with avrdude
6.0.1

Follow-up Comment #4, bug #40831 (project avrdude):

Since there is already a read endpoint fallback in usb_libusb.c:

if (fd->usb.rep == 0)
                        {
                          avrdude_message(MSG_INFO, "%s: usbdev_open():
cannot find a read endpoint, using 0x%02xn",
                                          progname,
USBDEV_BULK_EP_READ_MKII);
                          fd->usb.rep = USBDEV_BULK_EP_READ_MKII;
                        }

Should we either set the usb.rep value to 0 in the upper tool layer, or
explicitly zero it out in the usb layer?

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