> Hello,
> 
> we are using the Struck SIS 3100 VME interface for our experiment, but the midas
> driver doesn't have interrupt control integrated. Previously we were happy with
> just periodic readout, but our requirements have changed so I thought I could
> just implement this as there is a demo program provided by Struck on how to use
> their driver with interrupts.
> 
> Could you recommend an existing midas driver that has a good implementation of
> the midas interrupt functions (mvme_interrupt_*) just for me too use as a guideline?
> 
> Best regards,
> Clemens Sauerzopf

Hi Clemens,

We did have interrupt handling at some point under VxWorks and later with Linux, but it 
has always been a challenge.
As you may have found, the current frontend (mfe.c) still has some code to that purpose. 
But I wouldn't guarantee that recent development related to multi-threading didn't 
affect the expected interrupt operation (not been tested).

Now-a-days, I would suggest that you encapsulate your interrupt handling function based 
on the provided software into a independent thread started by a standard midas frontend. 
While the main frontend task could operate a periodic equipment as you've done so far, a 
polling equipment would poll on the data availability from the ring buffer. The readout 
function would compose the appropriate data bank.

This method has the advantage to decouple all the interrupt timing/restriction related 
issues from midas and run a conventional frontend. The ring buffer functions are part of 
midas (rb_...()).
Example for multi-threading can be found in examples/mtfe which include the use of the 
ring buffer as well.

Cheers, PAA