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[on:]

The following instructions can be used to restore the 16u2 firmware on an arduino mega2560, rev 3. Using a Macintosh/osX (Lion), with the Arduino IDE 1.0.0 installed in the applications folder.

1) Plugin a usb cable to the arduino mega rev3 in order to supply it with power.

2) Plugin an avrispmkII programmer into the 6 pin icsp1 jack located adjacent to the usb connector (observe pin1 orientation via the dot on the board). I had to use an 'extender' for the icsp1 connector as the avrispmkii connector wouldn't fit due to proximity to one of the edge-connectors on the arduino.

3) Open a terminal window, paste in the following command and execute it:

/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avrdude -C /Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf -p m16u2 -F -P usb -c avrispmkii -U flash:w:/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/firmwares/Arduino-COMBINED-dfu-usbserial-atmega16u2-Mega2560-Rev3.hex  -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m

4) Unplug both the programmer and the usb cable, then plug the usb cable in and the mac (and the pc) should recognize the usb port.

[Reply #1 on:]

Would I be able to use a parallel programmer to do this? I don't have the programmer you used, nor can I afford to buy one.

[Reply #2 on:]

Probably....best I can do...Give it a shot and tell us what happens!

[Reply #3 on:]

would I be able to use flip? or do I need to use avrdude?

[Reply #4 on:]

Well I finally got my parallel programmer built, and I used the following command to try and flash my 16u2

Code:

C:\arduino\arduino-1.0.1\hardware\tools\avr\bin>avrdude -C ../etc/avrdude.conf -
p m16u2 -F -c dapa -U flash:w:../../../arduino/firmwares/Arduino-COMBINED-dfu-us
bserial-atmega16u2-Mega2560-Rev3.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efus
e:w:0xF4:m -U lock:w:0x0F:m -v

but I get this...

Code:

C:\arduino\arduino-1.0.1\hardware\tools\avr\bin>avrdude -C ../etc/avrdude.conf -
p m16u2 -F -c dapa -U flash:w:../../../arduino/firmwares/Arduino-COMBINED-dfu-us
bserial-atmega16u2-Mega2560-Rev3.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efus
e:w:0xF4:m -U lock:w:0x0F:m -v

avrdude: Version 5.11, compiled on Sep  2 2011 at 19:38:36
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "../etc/avrdude.conf"

         Using Port                    : lpt1
         Using Programmer              : dapa
         AVR Part                      : ATmega16U2
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC6
         RESET disposition             : possible i/o
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page
      Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  Max
W   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ---
-- ---------
           eeprom        65    20     4    0 no        512    4    128  9000  90
00 0x00 0x00
           flash         65     6   128    0 yes     16384  128    128  4500  45
00 0x00 0x00
           lfuse          0     0     0    0 no          1    0      0  9000  90
00 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  9000  90
00 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  9000  90
00 0x00 0x00
           lock           0     0     0    0 no          1    0      0  9000  90
00 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0
 0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0
 0 0x00 0x00

         Programmer Type : PPI
         Description     : Direct AVR Parallel Access cable
           VCC     = 3
           BUFF    =  (not used)
           RESET   = 16
           SCK     = 1
           MOSI    = 2
           MISO    = 11
           ERR LED = 0
           RDY LED = 0
           PGM LED = 0
           VFY LED = 0

avrdude: AVR device not responding
avrdude: initialization failed, rc=-1
avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x000000
avrdude: Yikes!  Invalid device signature.
avrdude: Expected signature for ATmega16U2 is 1E 94 89
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed

         To disable this feature, specify the -D option.

avrdude done.  Thank you.


C:\arduino\arduino-1.0.1\hardware\tools\avr\bin>

Anyone got any ideas on whats going wrong?