[avrdude-dev] [patch #6188] avrdude should make 10 synchronization attempts instead of just one

[anonymous]

URL:
  <http://savannah.nongnu.org/patch/?6188>

                 Summary: avrdude should make 10 synchronization attempts
instead of just one 
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Thursday 09/06/2007 at 02:33 UTC
                Category: None
                Priority: 7 - High
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any

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Details:

We have suggested the following patch (original number 5708) well before the
release of version 5.4 of avrdude and it wasn't included in it. We are sure
that you have good reasons for your decision, but we'd like to ask you to
reconsider. To comply with GPL license we had to publish our changed version
of avrdude code on SourceForge (https://sourceforge.net/projects/avrdude5-3-1)
and after about a week 21 downloads were made, indicating people's interest.
We feel a bit ridiculous having to publish separately what mostly is your code
with a tiny change, and for this reason we submit the proposed patch again.

The bootloader we've developed is active during 30 milliseconds after reset.
During that window of time it needs to synchronize with avrdude. To achieve
that, it outputs a character that causes
stk500_getsync() to fail, thus causing avrdude to make another
synchronization attempt and then the handshake occurs. To make that possible
we need more than one synchronization attempt.

Our scenario:
1)avrdude runs and tries to sync with STK500 programmer (bootloader)
2)device reset, bootloader runs and outputs a NULL character 
3)avrdude fails synchronizing and makes another attempt
4)synchronization succeeds

We don't see any negative effects of this patch on existing STK500 users.








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File Attachments:


-------------------------------------------------------
Date: Thursday 09/06/2007 at 02:33 UTC  Name: stk500.c  Size: 29kB   By: None
See change in function stk500_getsync in file stk500.c and in diff.txt file
attached 
<http://savannah.nongnu.org/patch/download.php?file_id=13885>
-------------------------------------------------------
Date: Thursday 09/06/2007 at 02:33 UTC  Name: diff.txt  Size: 801B   By: None
See change in function stk500_getsync in file stk500.c and in diff.txt file
attached 
<http://savannah.nongnu.org/patch/download.php?file_id=13886>
-------------------------------------------------------
Date: Thursday 09/06/2007 at 02:33 UTC  Name: stk500_orig.c  Size: 28kB   By:
None
See change in function stk500_getsync in file stk500.c and in diff.txt file
attached 
<http://savannah.nongnu.org/patch/download.php?file_id=13887>

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