Experimental Physics and
Industrial Control System

[email protected] (Gabor Csuka) · Tue, 20 May 1997 09:27:09 +0200 (MET DST)

Hi Ned,
> 
> >
> > I have one question and one bug (? ) report
> >
> > 1. Question: in IOC Application Deveoper's Guide (Rel 3.13.0.beta4)
> >   wrote about I/O Event Scanning, but on dbScan.c (useing SCAN_IO_EVENT)
> >   faild.
> >   The reason is: piosl is initialized as NULL, and never updated. Where
> >   is my failure ?
> 
> 
> Gabor,
> 
>   I'm not sure I understand how far you got. "I/O Event Scan" only works
>   when the device support code supports it. The device support code must
>   provide a "get_ioint_info" function, or you cannot set the record to
>   "I/O Event Scanning". When the device support wants to cause the record
>   to process (usually as a result of a hardware interrupt), it performs a
>   scanIoRequest(pc->ioscanpvt); . devEventTestIoEvent.c in the EPICS
>   distribution is a good example.
> 
> 
>   Am I misunderstanding your question ?
> 

A little bit, I have some "I/O Event Scan" supported device yet, and
they are workin very well under R.3.12. We have a R.13.alfa5 on PC 
and a new record/device adn driver support for an inteligent AD card.
We wanted to add the "I/O Event Scan" support as implementation of the
continous mode, but this is faild during the iocInit, while somewhere 
in dbScan.c faild with the error message:

"scanAdd: I/O Intr not valid" 

As I see the code of the R3.12.beta7 , and If my understending is correct,
this code could not work. Or I missunderstand something.

Regards, Gabor

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System