bugAVR Downloader/UploaDEr - Bugs: bug #40831, LUFA AVRISP-MKII fails with...

 
 

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bug #40831: LUFA AVRISP-MKII fails with avrdude 6.0.1

Submitted by:  Larry Viesse <larryvc>
Submitted on:  Sat 07 Dec 2013 03:10:06 AM UTC  
Votes:  5  
 
Category: NoneSeverity: 3 - Normal
Priority: 5 - NormalItem Group: None
Status: NonePrivacy: Public
Assigned to: NoneOriginator Name: Larry Viesse
Open/Closed: Open

Wed 12 Mar 2014 10:26:43 PM UTC, comment #2:

OK, I see it in your file now:

The LUFA firmware requires the EP guesswork heuristics to
work.

OK, this really asks for doing it right then.

Joerg Wunsch <joerg_wunsch>
Project Administrator
Wed 12 Mar 2014 09:17:40 PM UTC, 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?

Joerg Wunsch <joerg_wunsch>
Project Administrator
Sat 07 Dec 2013 03:10:06 AM UTC, original submission:

The problem was found in usbdev_open in file usb_libusb.c.

The if statement:
prevents Dean's LUFA masqueraded endpoint from being discovered.

See full details at: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=138424&start=0&postdays=0&postorder=asc&highlight=

specifically in this post: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=1119592#1119592

Thanks for providing us with this awesome software.

Larry Viesse <larryvc>

 

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Items that depend on this one: None found

 

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  • -unavailable- added by rons (Voted in favor of this item)
  • -unavailable- added by joerg_wunsch (Posted a comment)
  • -unavailable- added by larryvc (Submitted the item)
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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Fri 23 May 2014 01:37:03 PM UTCronsCarbon-Copy-=>Added rons
    Wed 12 Mar 2014 10:26:58 PM UTCjoerg_wunschStatusNeed Info=>None
    Wed 12 Mar 2014 09:17:40 PM UTCjoerg_wunschStatusNone=>Need Info

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