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Author Topic: AVR debugger  (Read 782 times)
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mr_byte31
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« on: July 11, 2017, 10:35:56 10:35 »

Hi All,

I try to build a debugger for ATMega328.
I found ATMEL-ICE debugger very expensive but it supports most of MCU.


I tried to search for a cheaper solution. I found this programmer :

it only supports :  ATMega16, ATmega16L, ATMega162, ATmega162V, ATmega165, ATmega165V,  ATMega169, ATmega169V, ATMega32, ATMega323, ATmega323L, ATmega32L, ATMega64,  ATmega64L, ATMega128, ATmega128L, AT90CAN128

MY AVR is not part of them.

do any body have a success in this context  ?
I prefer to build my debugger rather than buy it
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Mega32
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« Reply #1 on: August 14, 2017, 09:34:31 21:34 »

You can't use that "programmer/debugger" for debugging a M328 , that debugger seems to support JTAG debugging only.

A M328 uses a protocol known as debugWire for debugging (not jtag) , so the "debug/programmer" needs to support that.

The cheapest "Official" debugger for a M328 is probably the AVR Dragon (it doesn't support all avr's , but quite a lot)
http://www.newark.com/microchip/atavrdragon/in-circuit-debug-prog-jtag-spi/dp/68T2063

http://www.atmel.com/tools/avrdragon.aspx

You would need Atmels AVR Studio software (Windows only) to control the Dragon debugger


Most (all) Atmel debug protocols are proprietary, and NOT made public.
This is why there's no "DIY clones".

The JTAG clone you have shown above, are all made with a M16 chip.
The protocol wasn't published , but Atmel forgot to enable the protection fuses on one of their old debuggers , using a M16.
That chip was read out, and used for cloning the old hw debugger that only supported the chips you mentioned.

Making a debugwire compatible debugger would be a huge job.

Well , it seems line someone claims to have built a debugwire device here , but it looks crippled and i'd bet there's no AVR Studio support.
https://github.com/dcwbrown/dwire-debug

Mega32
« Last Edit: August 14, 2017, 10:04:46 22:04 by Mega32 » Logged
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