Re: [avrdude-dev] EDBG is up for testing

[Rick Mann]

On Feb 28, 2014, at 14:20 , Joerg Wunsch <address@hidden> wrote:

> As Rick Mann wrote:
> 
>> I see, and that UC3 then communicates with the XMEGA via PDI or
>> JTAG?
> 
> Exactly.
> 
>> Seems like it should be possible to create the necessary CMSIS-DAP
>> endpoints in the XMEGA (with USB support) and debug it internally
>> (although, I'm not sure if the CPU has access to the PDI registers).
> 
> I don't think you will get full accessibility to the debugging
> stuff.  However, that's basically the way debugWIRE works, so it's
> definately possible to reach limited debugging capabilities that
> way.
> 
> However, keep in mind that the CPU has to remain running all the time,
> in order serve the USB stuff.

Oh yes, excellent point.

>> In any case, I won't be putting a separate AVR32 on my design :-)
> 
> I don't even think you'll be able to buy the custom EDBG chip
> separately.

Oh, no, I meant rolling my own. Definitely won't be doing that. Although, they 
really should make the source of the EDBG chip available!

Nope, I'll keep PDI accessible, and use USB for application-specific stuff.

Thanks!

-- 
Rick

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