How to read arduino flash memory

Question

Imagine i'have lost my source code. Is there a way to dump an arduino flash memory ? What i want to do is to get an hex file on my PC that represent byte per byte the arduino flash memory (including bootloader)

I have 3 arduino types:

Arduino UNO (rev3)
Arduino MEGA
Leonardo Ethernet

Thanks

This might depend on your particular model.

tadman
– tadman

2017-03-13 17:57:35 +00:00
Commented Mar 13, 2017 at 17:57 — tadman
– tadman, Commented Mar 13, 2017 at 17:57
thanks. See my edits

Bob5421
– Bob5421

2017-03-13 17:59:29 +00:00
Commented Mar 13, 2017 at 17:59 — Bob5421
– Bob5421, Commented Mar 13, 2017 at 17:59

Jeff Loughlin · Accepted Answer · 2017-03-13 18:00:00Z

6

avrdude can do that for you. The specifics will depend on which arduino you have, but something like:

avrdude -p m328p -P usb -c usbtiny -U flash:r:flash.bin:r

will get you the contents of the flash memory.

Here's a site with more info:

http://www.evilmadscientist.com/2011/avr-basics-reading-and-writing-flash-contents/

answered Mar 13, 2017 at 18:00

Jeff Loughlin

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Bob5421 Over a year ago

Thanks: Do you know which programmer i should pass as -c argument for this device: store.arduino.cc/product/A000092

Dharman · Accepted Answer · 2022-01-17 01:02:13Z

1

It seems that using an Arduino board, the programmer (option -c) must be set to arduino (see the avrdude manual for details). Also, I had to specify the ACM port (in my case /dev/ttyACM0 on a Linux machine).

The full command to read (and backup the flash to flash.bin) is thus:

avrdude -p m328p -P /dev/ttyACM0 -c arduino -U flash:r:flash.bin:r

And to restore the flash, you can use:

avrdude -p m328p -P /dev/ttyACM0 -c arduino -U flash:w:flash.bin

edited Jan 17, 2022 at 1:02

Dharman♦

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answered Jan 17, 2022 at 0:57

Vincent Stragier

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2 Comments

aleXela Over a year ago

can i read only the bootloader?!

Vincent Stragier Over a year ago

@aleXela, yes you can, see the details for the option -U in the manual. In my case, it would have been avrdude -p m328p -P /dev/ttyACM0 -c arduino -U boot:r:bootloader.bin:r

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