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

From: Rick Mann
Subject: Re: [avrdude-dev] EDBG is up for testing
Date: Fri, 28 Feb 2014 14:16:56 -0800

On Feb 28, 2014, at 14:12 , Joerg Wunsch <address@hidden> wrote:

> As Rick Mann wrote:
>> Ah, I thought, based on your description, the perhaps debugging
>> could be accomplished via USB.
> I think that's the way CMSIS-DAP is intended for ARM devices.  ARM
> markets it as an IP block that can be integrated into an ARM design.
> In this case, however, it's implemented in the EDBG chip (a custom UC3
> AVR32 microcontroller tailored for the purpose) which is part of the
> Atmel-ICE or Xplained Pro Evaluation board.  (The UC3 on the JTAGICE3
> serves the same purpose.)

I see, and that UC3 then communicates with the XMEGA via PDI or JTAG?

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).

In any case, I won't be putting a separate AVR32 on my design :-)


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