[avrdude-dev] [patch #6261] avrdude won't use dragon/debugwire to write a file to eeprom

[Mark Litwack]

URL:
  <http://savannah.nongnu.org/patch/?6261>

                 Summary: avrdude won't use dragon/debugwire to write a file
to eeprom
                 Project: AVR Downloader/UploaDEr
            Submitted by: mlitwack
            Submitted on: Thursday 11/08/2007 at 20:07
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

If avrdude is given a file to write to eeprom it will try to
write it using page mode (jtagmkII_paged_write()).  However,
page mode writes to eeprom are not allowed when using
dragon/debugwire, thus causing the write to fail.

If avrdude is used in interactive mode, byte-at-a-time
writes (jtagmkII_write_byte()) to eeprom do work correctly
with debugwire.

Avrdude already contains code to detect and prevent paged
writes to eeprom when in debugwire mode.  Instead of simply
returning a failure, this patch calls the routine to write a
byte at a time to the eeprom since that is known to work.
This allows a file to be written to eeprom in debugwire
mode.

This patch probably fixes this problem with other debugwire
programmers as well, but so far has only been tested with
the AVR Dragon.

This patch is for avrdude-5.5, but the problem is also known
to exist in avrdude-5.4.

-mark




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File Attachments:


-------------------------------------------------------
Date: Thursday 11/08/2007 at 20:07  Name: dragon-dw-eeprom.patch  Size: 961B 
 By: mlitwack
Modifies avrdude-5.5/jtagmkII.c
<http://savannah.nongnu.org/patch/download.php?file_id=14341>

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