Hello Joerg, On Tue, Oct 20, 2015 at 9:35 AM, Joerg Wunsch <j...@uriah.heep.sax.de> wrote:
> As Element Green wrote: > > > Thank you for your reply. I downgraded the firmware to 7.21 (from AVR > > Studio 5). > > I just upgraded another Dragon to 7.38 (decimal), and it works without > troubles using AVaRICE (SVN version) on my ATxmega16D4 board. > > Good to hear that it's not related to the version. > > I attempted to use the Dragon to connect to 2 different XMEGA devices, > one > > is a custom PCB I made with an xmega16d4, the other is a development > board > > with an xmega128d4 using AVR Studio 7 in programming mode. It could read > > the reference voltage but not the device ID. > > That somehow smells like connection issues on the PDI level. > > The target voltage is sensed on the Dragon itself, without the need > for a working PDI link. This error code 0xAE is likely an indication > for PDI link issues - but still, you might ask Atmel explicitly about > that. While the JTAGICEmkII protocol is officially documented in an > appnote, the Xmega protocol isn't. > > How long's your cable? The levelshifters/drivers on the Dragon are > known to be fairly weak. In general, the cables that come with an STK500 > work well, they are about 15 cm long. Anything longer might cause > troubles. > I had that thought as well about the cable length after reading something to that effect on a forum post. My guess is that that is the issue now that you mention it again, though I got sidetracked by the thought that it was a version incompatibility. The cable I have came with a ZeptoProg II programmer and is probably about 10 inches long. I'll get some shorter ones and see if that makes a difference. Perhaps the 0xAE code can be used to identify cable length issues. Guess I will see. > -- > cheers, Joerg .-.-. --... ...-- -.. . DL8DTL > > Cheers! Element Green
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