Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 16 Jun 2011 12:20:47 -0500

There is obviously a need for a VME DMA API in devLib.  APS has been using one 
I designed here for many years, and there are tech-talk messages archiving my 
implementations of this for vxWorks for all 3 of the VME interface chips we 
use here (VMEChip2, Universe-2, Tempe).  Recently Mark Rivers started using it 
for some of his code and now Diamond have looked at it.  I believe that Till 
has a slightly different API for RTEMS with implementations for the Universe-2 
and Tempe chips, and PSI also wrote their own but I don't know what chips or 
OSs that runs on.

I've already suggested that Michael Davidsaver add a pluggable DMA API to 
devLib so we can stop reinventing this particular wheel, but I know he's busy 
with work on NSLS-II so he might appreciate some help.  If anyone discusses 
this topic in the future, /please/ use tech-talk (or core-talk) so others can 
also join in.

- Andrew

On 2011-06-16 Ernest Williams wrote:
> From: Williams Jr., Ernest L.
> Sent: Wednesday, June 15, 2011 10:39 PM
> To: Korhonen Timo; Keahey, Pelham; Hu, Yong
> Cc: Szalata, Zenon M.; Straumann, Till; Kim, Kukhee; [email protected];
>  Allison, Stephanie; [email protected]; Williams Jr., Ernest L. Subject:
>  RE: FW: EPICS driver for SIS3302
> 
> Hi,
> 
> This sounds like a great codeathon topic.
> 
> Till are you interested in this as well?
> 
> Can we get this kind of thing in devLib2 --> libCom ?
> Michael, what do you think?
> 
> 
> 
> Cheers,
> Ernest
> ________________________________________
> From: Korhonen Timo [[email protected]]
> Sent: Wednesday, June 15, 2011 9:47 PM
> To: Keahey, Pelham; Williams Jr., Ernest L.; Hu, Yong
> Cc: Szalata, Zenon M.
> Subject: RE: FW: EPICS driver for SIS3302
> 
> Hi all,
> 
> sorry for the late reply.
> The complicated part of our driver is that we make heavy use of DMA, and
> we have some libraries that are on top of the vxWorks BSPs. So it
>  unfortunately will need some work to get it to run on RTEMS; libCom did
>  not have this support (as far as I remember). It should, though - but this
>  is another issue.
> 
> In any case we would be happy to share the driver. To understand it
>  somebody needs to look at the vxWorks dependent part, to be able to
>  replicate the API functions in RTEMS.
> 
> best regards,
> 
> Timo
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System