# Jtag debugging AVR

Can anyone advise what hardware and software is required for debugging AVR in circuit.

One of the cheapest programmers that have in-circuit emulation capabilities is the AVR Dragon. It will cost you about $50,-. It is cheap for a reason though: it's too easy to overload the circuit and break the programmer. If you get one I recommend that you find some form of protection like a DragonRider or a DragonHide. (I already killed my first dragon which is surprisingly easy to do) A more robust solution would be an AVR-JTAG-ICE-MKII but this thing is much more expensive. You can also try and build one yourself. Another option for hardware may be the Bus Pirate at$27.15(sold though seedstudio) which also do other things. I haven't used it for JTAG yet, but this is what the manual says: link.