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LUFA bootloaders ought to disable interrupts during program page operations
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inizen  
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 More options Nov 9 2012, 4:35 am
From: inizen <thedocmar...@gmail.com>
Date: Fri, 9 Nov 2012 01:35:43 -0800 (PST)
Local: Fri, Nov 9 2012 4:35 am
Subject: LUFA bootloaders ought to disable interrupts during program page operations
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Hi Dean:

I found some old 2008 posts on this, but I have been playing with your
bootloaders and noticed that my test runs had very occasional word errors
(words left at 0xFFFF) in the bootloaded code. I'm fairly sure this is
caused by not disabling interrupts during the programming phase (while the
bootloader is firing out time-sensitive SPM instructions). Your code might
work because there is no USB activity (hence no USB interrupts) during a
program page operation but I think my LED flash timer was causing a
problem. The sample code on
http://www.nongnu.org/avr-libc/user-manual/group__avr__boot.html temporarily
disables interrupts and it would seem an obviously bad idea to
unpredictably interrupt a program page operation. When I disabled
interrupts my 0xFFFF glitches went away.

Regards,

Martin


 
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Dean Camera  
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 More options Dec 11 2012, 7:32 pm
From: Dean Camera <abcminiu...@gmail.com>
Date: Tue, 11 Dec 2012 16:32:55 -0800 (PST)
Local: Tues, Dec 11 2012 7:32 pm
Subject: Re: LUFA bootloaders ought to disable interrupts during program page operations
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Hi Martin,

Sorry I missed this one (need to put better GMail filters in place to
highlight support threads I haven't answered). You've got a good point
- I couldn't find any explicit information in the memory section of
the datasheet that spells out what would happen with the interrupts,
but it can't be a good idea either way. Can you please add a bug
report to the tracker (http://www.lufa-lib.org/tracker) so that I
don't forget about this? I'll fix it up when I'm back at my primary
development machine in early January.

Cheers!
- Dean

On Nov 9, 8:35 pm, inizen <thedocmar...@gmail.com> wrote:


 
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Martin Lambert  
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 More options Dec 13 2012, 2:21 pm
From: Martin Lambert <thedocmar...@gmail.com>
Date: Thu, 13 Dec 2012 19:21:06 +0000
Local: Thurs, Dec 13 2012 2:21 pm
Subject: Re: [LUFA Support : 3800] Re: LUFA bootloaders ought to disable interrupts during program page operations
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Hi Dean:

I filed this as a bug as requested.

Regards,

Martin


 
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Dean Camera  
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 More options Dec 13 2012, 7:00 pm
From: Dean Camera <abcminiu...@gmail.com>
Date: Thu, 13 Dec 2012 16:00:08 -0800 (PST)
Local: Thurs, Dec 13 2012 7:00 pm
Subject: Re: LUFA bootloaders ought to disable interrupts during program page operations
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Thanks Martin! I'll patch it when I'm back at my main machine.

- Dean

On Dec 14, 6:21 am, Martin Lambert <thedocmar...@gmail.com> wrote:


 
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