Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Tue, 17 Aug 2010 08:44:38 -0700

Have a look at the 'SRQ Processing' section of the devGpib documentation (<asyn>/documentation/devGpib.pdf).  The command table type element should be GPIBREADW (or one of the other GPIBxxxxxxW values) which waits for the device to issue a SRQ then performs the read (or write) operation.

You do not have to use get_ioint_info yourself -- the devGpib code handles this.

On Aug 17, 2010, at 7:44 AM, Hinko Kocevar wrote:

> Hi,
> 
> I've created a device support for simple GPIB according to the
> http://www.aps.anl.gov/epics/modules/soft/asyn/R4-14/HowToDoSerial/tutorial.pdf
> guide. I can get the data from the device as expected.
> 
> Versions: EPICS R3.14.10, Asyn 4-14.
> 
> I've added the SCAN field to my record:
> 
> record(stringin, "$(P)$(R)VOL:N5V")
> {
> 	field(DESC, "Read -5V voltage")
> 	field(DTYP, "RFClock")
> 	field(INP,  "#L$(L) A$(A) @4")
> 	field(SCAN, "I/O Intr")
> }
> 
> At IOC startup I get following message:
> PV: FOO:BAR:VOL:N5V scanAdd: I/O Intr not valid (no get_ioint_info)
> 
> After Googling a bit I found some pointers in 4_3_DeviceSupport_APS.pdf,
> but I'm a bit confused how to actually implement modification in my
> device support.
> 
> If I understand correctly, I need to setup my own DSET with the
> get_ioint_info being defined. Done that:
> 
> static long get_ioint_info (int cmd, struct stringinRecord *si,
> IOSCANPVT *ppvt)
> {
> 	printf("%s:%d ENTER\n", __FUNCTION__, __LINE__);
> 	
> 	return 0;
> }
> 
> static gDset DSET_SI_IOSCAN = {
> 	6,
> 	{0, 0, devGpib_initSi, get_ioint_info, devGpib_readSi, 0},
> 	&devSupParms
> };
> epicsExportAddress(dset,DSET_SI_IOSCAN);
> 
> Modified the struct gpibCmd gpibCmds[] = {
> ...
> /* Param 4 - Read the -5V voltage */
> /*{&DSET_SI, GPIBREAD, IB_Q_HIGH, "VOL:N5V?", "VOL:N5V %s\r\nOK", 0, 80,
> NULL, 0, 0, NULL, NULL, NULL},*/
> {&DSET_SI_IOSCAN, GPIBREAD, IB_Q_HIGH, "VOL:N5V?", "VOL:N5V %s\r\nOK",
> 0, 80, NULL, 0, 0, NULL, NULL, NULL},
> 
> ...
> };
> 
> Now at IOC startup I get following messages:
> FOO:BAR:VOL:N5V : init_record : record type invalid for spec'd GPIB param#4
> PV: FOO:BAR:VOL:N5V scanAdd: I/O Intr not valid (no get_ioint_info)
> 
> 
> 
> Not really sure what needs to done from here on.
> 
> 
> Best regards,
> Hinko
> 
> -- 
> Hinko Kocevar
> Technical support software engineer
> Instrumentation Technologies d.d.
> Velika pot 22, SI-5250 Solkan - Slovenia
> T:+386 5 3352600, F:+386 5 3352601
> mailto: [email protected]
> 
> http://www.i-tech.si - When your users demand stability
> 
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-- 
Eric Norum
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System