James,

   Don beat yourself up over a mistake.We still want
an Admin :) I have read of a better solution in
solving  signal problems. It is under Circuit Cellar
201. Subject is Reverse-Engineered ECP Bus. 

Regards,
John


--- "James Newton, Host" <jamesnewton@piclist.com>
wrote:

> > From: James Newton
> > Sent: 2007 Mar 30, Fri 09:43
> >
> > I'm quite a few hours into attempting to connect a
> microSD 
> > (aka TransFLASH) card to an MSP430F1611 and I'll
> be damned if 
> > I can get any response back from the card.
> > 
> > I've read the datasheets, I've read the many
> available web 
> > pages on the subject, I've checked, re-checked,
> double 
> > checked and had others check the connections, and
> I'm looking 
> > at the signals I'm putting out on a logic analyzer
> and they 
> > are dead on exactly what is called for. And there
> is NO 
> > response from x4 cards.
> 
> 
> I'm going to do what is good for the soul here and
> admit what the actual
> problem turned out to be. The spec calls for 4 bytes
> of argument to be sent
> between the command and the CRC. I was sending 3
> bytes. 
> 
> I'm not sure how many times I checked the analyzer
> display against the spec,
> but it must have been 50 or more times. Didn't see
> that (obvious) difference
> every single time. Another guy looked at it and said
> "hey, doesn't that say
> 4 bytes? This looks like 3 to me..."
> 
> Whereupon I said "No fxxking WAY!", changed the
> code, ran it and completely
> freaked out when the card responded.
> 
> I'm not charging the client for about 2 days of
> otherwise billable time.
> Some times I think it's a good thing I have a day
> job. Sigh. If it wasn't
> for the fact that in the past I've pulled many a
> project out of the toilet
> and saved more than a few other peoples bacon from
> the fire, I would quit
> doing this sort of work.
> 
> Another point is that I have got to get a new unit
> that can export images of
> the signals so that I can post them for other people
> to look at.
> 
> ---
> James Newton: PICList webmaster/Admin
> mailto:jamesnewton@piclist.com  1-619-652-0593 phone
> http://www.piclist.com/member/JMN-EFP-786
> PIC/PICList FAQ: http://www.piclist.com
> 
> 
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