Re: Hardware Abstraction Layer - Rev 0.01

["David A. Frantz" <wizard-at-eznet.net>]

Not to sound like a me to echo; but I think it is fair to say that the 
proposal put forward does take some time to digest.    For those of us 
new to EMC, there is a certain amount of background that has to be learned.

That being said, the one thing that keeps coming back in my mind is an 
integrated PLC.    Nothing fancy of course, just a clean and easy way to 
map I/O between devices.     The idea being to have the "PLC" update 
code handle writting to I/O.  Yes you will still have the CNC controller 
dealing with its own realtime I/O, this however could take care of 
everything else.

The idea of course is that simple I/O updates routines would be called 
in the PLC update code to handle actual I/O writing and reading.   These 
small routines would  easily seperated the hardware from the software.

Dave


Matt Shaver wrote:

>On Wednesday 07 May 2003 17:09, you wrote:
>  
>
>>?"Judging from the deafening silence after I posted my proposal...
>>    
>>
>
><...>
>
>  
>
>>Yea.. Given the enthusiasm of the discussions at NAMES... 
>>    
>>
>
>I wouldn't necessarily interpret the silence as disinterest. I've printed out 
>the prelim HAL spec & have been reading it over (and over...) with great 
>interest. I hope to have some intelligent comments to post shortly! I also 
>talked with Fred on the phone today and he said he hadn't read the HAL 
>proposal yet, but would look at it in the next day or so. I have the 
>impression that Fred & Will pay more attention to the emc-developers list 
>than emc-at-nist.gov, and that explains their seemingly peculiar silence thus 
>far.
>
>Me personally, I've got to:
>
>1. Make some money.
>2. Understand the EMC code better.
>
>before I can contribute, but give it some time and I think you'll see stuff 
>start to happen. The documentation/education issue is the most important 
>right now.
>
>  
>
>>BTW, since no one else commented....THANKs for taking it this far,
>>you've really put a lot of your thought and experience into this.
>>    
>>
>
>Hey, me too! There'll be more activity soon I'm sure.
>
>Matt
>
>
>
>
>
>  
>