[En-Nut-Discussion] Olimex LTD AVR-JTAG dongle

[Erik Lins]

Hi,
the Atmel JTAG interface will support the DebugWire interface for the tiny
AVRs from beginning of next year on. I suppose the Olimex interface won't.

Cheers,
ER!K

---
LINS Technologies
http://www.lins.de


Waschk,Kolja wrote:
>> Does anyone have any experience with the Olimex LTD AVR-JTAG dongle ?
>
> I'm currently using it with an Ethernut 1.3F board, and
> avr-gdb/avarice on the host PC to upload flash contents and for
> debugging.
>
> You can use the connector as described in
>
>   http://www.ethernut.de/en/jtag/jtagconn.html
>
> with a small modification: the Olimex AVR-JTAG wants to draw its
> operating power from the target via Vsupply. Connect both Vsupply and
> VTref to ISP2.
>
> The Atmel JTAG ICE also works with 3.3V targets; the Olimex AVR-JTAG
> doesn't, because it doesn't have the level shifters (and the ATmega16
> inside is not the L version that would run at 3.3V as well - Olimex
> told me their distributor didn't have those in stock). That doesn't
> make a problem if you want to use it with 5V targets (such as
> Ethernut) only.
>
> A description how to build a similar JTAG ICE clone can be found on
> the web ( http://avr.openchip.org/bootice/ ) - but for USD 40, the
> Olimex device is really a good buy.
>
> Kolja