Re: [avrdude-dev] AVR Dragon on OS X

[Shaun Jackman]

The `AVR069: AVRISP mkII Communication Protocol' document is available
from Atmel:
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3808

It's a big help when doing low-level debugging. It defines the
protocol between the computer and the mkII, not between the mkII and
the target device.

Cheers,
Shaun

On 7/20/07, Brian Shire <address@hidden> wrote:
> Hello.  I'm trying to get the AVR Dragon to work under OS X using
> avrdude.  I've read this thread regarding the topic:
> http://www.nabble.com/AVR-Dragon-with-OS-X-Intel-Machine-t3621118.html
>
> But the referenced argument (-B) doesn't help in my specific case at
> all.  After following up with the original poster, they replied that
> they where in fact still having difficulties despite their last post
> of reporting success.
>
> Looking into the source code a bit, if I send the sign-on message
> twice it will report a success, but of course this messes up the rest
> of the protocol.  I'm curious if you think this might be a buffer
> flushing issue between libusb and the device or perhaps if there is a
> protocol difference between the mkIII board that this code seems to
> be based off of?  I don't see the official specifications for
> communication with the device in specific (I'm using ISP), is that
> published somewhere?
>
> The device will hang forever, when enabling extra logging I can see
> that the code is reporting a timeout while waiting for the sign-on
> response from the Dragon board.  Happy to help debug at a low level
> if someone can help me along a bit, appreciate any help/suggestions.
>
> Thanks!
>
> -shire