[avrdude-dev] [bug #29108] Automatic reset (DTR / RTS toggling) fails for "arduino" programmer type under Linux.

[David A. Mellis]

URL:
  <http://savannah.nongnu.org/bugs/?29108>

                 Summary: Automatic reset (DTR / RTS toggling) fails for
"arduino" programmer type under Linux.
                 Project: AVR Downloader/UploaDEr
            Submitted by: mellis
            Submitted on: Sun 07 Mar 2010 05:54:36 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: David A. Mellis
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

The automatic reset that the "arduino" programmer type should perform before
uploading fails (for some boards) under Linux.  The code generates a rising
edge, rather than the falling edge needed for the reset to occur.  This is
because the ser_set_dtr_rts() function in ser_posix.c is backwards, setting
the lines when they should be cleared and vice-versa.  See patch #7100:
https://savannah.nongnu.org/patch/?7100 for a fix.

(The problem doesn't manifest in Mac OS X because the operating system
automatically lowers the lines when the serial port is opened, generating a
reset.)




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