FWIW, I’m operating a Dragon to an ATxmega128a4u over ca. 40mm of ribbon cable reliably. You also have a speed setting in avrdude to fiddle with. Mine is running at /usr/bin/avrdude -B 2.0 -p atxmega128a4u -P usb -c dragon_pdi.... but that can be slowed down in problematic cases.
Arnim From: Element Green [mailto:elem...@elementsofsound.org] Sent: Wednesday, 21 October 2015 12:40 p.m. To: Joerg Wunsch; Subject: Re: [AVaRICE-user] AVR Dragon not working with atxmega16d4 Hello Joerg, On Tue, Oct 20, 2015 at 9:49 AM, Element Green <elem...@elementsofsound.org<mailto:elem...@elementsofsound.org>> wrote: 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. So I shortened the cable by removing the connector, cut it to about 4 inches and then put the connector back on. It still was getting the same error code with my custom PCB, but it goes through a motherboard interconnect plus a few extra inches. So I then tried it on the little development board I have and it came back with a device ID which is currently unsupported (the xmega128d4) which it was not doing with a longer cable. So it seems like it would likely work if the interconnect was not there. I cut the cable to 2 inches and still same 0xAE error code. I'm thinking of getting an MKII clone like this one since they seem to be available for under $43 online: http://www.wvshare.com/product/USB-AVR-JTAGICE-XPII.htm Any idea if those will work OK with debugging or if it might work better than the Dragon in regards to cable length? Guess the easiest thing to do is just try it. -- cheers, Joerg .-.-. --... ...-- -.. . DL8DTL Cheers. Element
------------------------------------------------------------------------------
_______________________________________________ avarice-user mailing list avarice-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/avarice-user
