Experimental Physics and
Industrial Control System

[email protected] (Ned Arnold) · Fri, 16 May 1997 09:21:26 -0500

> 
> 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 ?

  	Ned

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System