I want take a look at the memory and at the elements inside the atmega1280. I compiled Ardupilot sketch and I uploaded it with an arduino.

I started avarice with the following command:

$ avarice --mkII --capture --jtag usb :4242

and I started avr-gdb

$ avr-gdb /tmp/build5831285936308447966.tmp/ArduPilotMega.cpp.elf 

I typed:

(gdb)target remote localhost:4242

and this is the answer:

(gdb) target remote localhost:4242
Remote debugging using localhost:4242
0xfffffffe in ?? ()

when I do list it show me

#include <WProgram.h>

int main(void)


    for (;;)

    return 0;

That is not my ardupilot!

I don't understand why I get the ?? symbol after the target command and why I get a different source after the list command.

Could someone explain where is my error, how they work and the reason of those symbols? More important, how can I take a look inside of the atmega1280?

P.S.: I compiled with Arduino, so I compiled with the -g flag.

Edit: I used an unofficial jtagice mkii:

enter image description here

and I follow this guide for the setting http://www.diydronesafety.com/topic/72-articleundocumented-apm2x-jtag-technique-and-jtag-for-apm1x-using-only-the-redboard/

So mine is presented like this:

enter image description here

  • 4
    \$\begingroup\$ ... in fact that is what every arduino sketch looks like you simply implement setup and loop in a separate file than that one... \$\endgroup\$ – vicatcu Apr 4 '13 at 22:17
  • \$\begingroup\$ As viactcu suggests, everything looks fine. Try tracing into the setup() or loop() calls and see if it's as you expect. up. If not, you may have told the development-machine-side gdb to reference the wrong elf object. \$\endgroup\$ – Chris Stratton May 6 '13 at 1:19

You should think about investing in JTAGICE MKII, it supports many Atmel device. When you use it with Atmel AVR Studio, debugging is a breeze and it allows you to look inside all the devices.

| improve this answer | |
  • \$\begingroup\$ So, are you saying that i can't do it without atmel avr studio? \$\endgroup\$ – DarkCoffee Apr 5 '13 at 15:25
  • \$\begingroup\$ AVR Studio is free and is easily the best debugging interface for Atmel chips. I would peruse through AVRfreaks.net too if you're looking for more help with this; I bet the forums there have what you're looking for. As a side note I have the JTAGICE3 and it was probably the best money I ever spent on a debugger. \$\endgroup\$ – tmwoods Apr 8 '13 at 3:14

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