Experimental Physics and
Industrial Control System

Till Straumann <[email protected]> · Thu, 16 Jun 2011 12:31:15 -0500

On 06/16/2011 12:20 PM, Andrew Johnson wrote:

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.

The one I have for RTEMS is actually an adapter layer that implements
your API (the one that comes in 'gtr'). IIRC there are some enhancements
but the basic functionality is fully compatible with your stuff.

Under the hood we can use universe or Tsi148 but that is mostly

transparent to the user.

T.

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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System