[avrdude-dev] [patch #5703] avrdude should make 10 synchronization attempts instead of just one

[anonymous]

URL:
  <http://savannah.nongnu.org/patch/?5703>

                 Summary: avrdude should make 10 synchronization attempts
instead of just one
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Tuesday 01/23/2007 at 01:55 UTC
                Category: None
                Priority: 7 - High
                  Status: None
                 Privacy: Private
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

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.

see change in function stk500_getsync in file stk500.c attached 




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Tuesday 01/23/2007 at 01:55 UTC  Name: stk500.c  Size: 29kB   By: None
see change in function stk500_getsync in file stk500.c attached 
<http://savannah.nongnu.org/patch/download.php?file_id=11821>

    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/patch/?5703>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/