[avrdude-dev] AVR Dragon on OS X

[Brian Shire]

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