On Wed, May 13, 2009 at 6:11 PM, David Brownell <davi...@pacbell.net> wrote:
> On Wednesday 13 May 2009, Řyvind Harboe wrote:
>> >> Not always, TAP_INVALID is really TAP_DONTCARE
>> >
>> > I was wondering about that.  Someone should rename it
>> > so it's no longer nonsense.
>>
>> The point
>
> Make that:  "another" point.
>
>
>> is to do away with "don't care", "default" and global variables.
>
> That can work.  But INVALID != DONTCARE.  All those calls
> referencing TAP_INVALID read, to anyone not deeply familiar
> with the code, like "do <something> with an illegal state".

TAP_INVALID can stay because it would truely be invalid to
use it anywhere. You can't define an invalid end state under
the new scheme, nor a default state, just a state that the
TAP controller should move into after scanning.


-- 
Øyvind Harboe
Embedded software and hardware consulting services
http://consulting.zylin.com
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