[Efi332] Queued Serial IO on the MPC555...

[David Eicher]

Hi Paul,
 
Any progress on the queued serial I/O?
 
Getting that working on the MPC555 is my next task (with interrupts). Maybe
we can compare notes as we go along on it here and help each other. 
 
For a starting point I want to see what the Quickstart package says about
it, and build on that foundation (use that interface to the hardware for
both access to the QSCI and for interrupt handling). Is that your approach?
 
More later when I get something built and try to run it.
 
thanks,
 
dave
 

  _____  

From: efi332-bounces at diy-efi.org [mailto:efi332-bounces at diy-efi.org] On
Behalf Of Paul Helmuth
Sent: Sunday, September 11, 2005 9:34 AM
To: efi332 at diy-efi.org
Subject: [Efi332] Queued Serial IO on the MPC555...


All,
 
My "ignition only" testing has gone flawlessly. I had some initial issues
with my sensor mount not being rigid enough (engine vibration would cause
the crank trigger signal to get mangled such that PMMX would lose synch),
but an additional bracket (from the tip of the sensor mount back to the
block) has that under control.
 
I have a lot of stuff to do to add the fuel injection side, but one critical
piece of the puzzle will be to implement queued serial I/O. Right now I am
just the simple "direct/immediate" I/O routines (you see these everywhere in
various sample code for the 555 - I think Axiom may have been the original
author?).
 
I have seen a few comments from the group that indicate there are some
problems getting the queued serial I/O to work (at least reliably,
consistently, predictably). That's a little disconcerting, but I'd like to
see if I get it sorted out.
 
I have taken a look at Jeff Clark's source from the 332 project, but I was
wondering if any of you may have some work in progress on the 555 platform
that I could use as a starting point?
 
Needless to say, I would make my results available to the group.
 
It would also be great to collect a "bug list" - that is, to understand any
existing problems that you guys have seen. I have heard there are problems,
but I don't recall seeing any specifics.
 
Hope all is going at least as well for your projects.
 
-Paul
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