[avrdude-dev] [bug #43268] usb_drain() call causes LUFA AVR-ISP MKII Code to Fail

[Colin O Flynn]

URL:
  <http://savannah.nongnu.org/bugs/?43268>

                 Summary: usb_drain() call causes LUFA AVR-ISP MKII Code to
Fail
                 Project: AVR Downloader/UploaDEr
            Submitted by: c_oflynn
            Submitted on: Sun 21 Sep 2014 11:31:24 GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: c_oflynn
         Originator Name: Colin O'Flynn
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I had seen this reported on AVRFreaks (originally at
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=819522 but I
don't know the new link). 

The LUFA AVR-ISP MKII has different endpoint settings than a 'real' AVR-ISP
MKII, due to some compatibility issues with libusb. This seems to be triggered
by the call to drain() on the USB endpoint.

Easy fixes I see:

1) Turn it off on a per-programmer basis (i.e. for AVR-ISP MK2 only), probably
via the config file.

2) Turn if off globally, but with a command-line switch to re-enable it in
case it broke something

Opening this bug report to track the issue.




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