Re: related to coding

[priya tiwari <tiwaripriya013@gmail.com>]

Thanks Sir,
I changed in a code but still i got the errors at run time.please provide me solution.

On Mon, Feb 2, 2015 at 9:50 AM, Mooney, Tim M. <mooney@aps.anl.gov> wrote:

Hi Priya,

Return 2, instead of 0, from read_ai.  That tells the record that you put the value in VAL.  If you return 0, you are telling the record you put the value in RVAL, and that the record should convert RVAL to get VAL.

See "Device Support Routines" in 

https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Analog_Input

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of priya tiwari [tiwaripriya013@gmail.com]
Sent: Sunday, February 01, 2015 9:54 PM
To: tech-talk@aps.anl.gov
Subject: related to coding

Hello,

I am trying to write the value into val field of ai record from device support.I am beginner in EPICS so I have no idea about this. But i have tried then i got the errors at run time please help me.I am attaching code file.

Thanks in advance...

Attachment: Screenshot from 2015-02-02 10:30:06.png
Description: PNG image

#include <stdio.h>
#include <stddef.h>
#include <string.h>

#include "alarm.h"
#include "cvtTable.h"
#include "dbDefs.h"
#include "dbAccess.h"
#include "recGbl.h"
#include "recSup.h"
#include "devSup.h"
#include "link.h"
#include "aiRecord.h"
#include "epicsExport.h"

static long init();
static long init_record();
static long read_ai();

char buf[100];

struct {
 long       number;
 DEVSUPFUN  report;
 DEVSUPFUN  init;
 DEVSUPFUN  init_record;
 DEVSUPFUN  get_ioint_info;
 DEVSUPFUN  read_ai;
 DEVSUPFUN  special_linconv;
}devaiVal={
      6,
      NULL,
      init,
      init_record,
      NULL,
      read_ai,
      NULL};
epicsExportAddress(dset,devaiVal);

static long init()
{

return(2);
}

static long init_record(precord)
struct aiRecord *precord;
{
 switch (precord->inp.type) {
    case (CONSTANT) :
	return(0);
	break;
    case (PV_LINK) :
    case (DB_LINK) : 
    case (CA_LINK) :
    break;
    default :
	recGblRecordError(S_db_badField,(void *)precord,
		"devWfSoft (init_record) Illegal INP field");
	return(S_db_badField);
    }
return(2);
}

static long read_ai(precord) 
struct aiRecord *precord;
{
char myptr[100];
int e;
DBADDR *dbaddr;
precord->VAL=3;
e=precord->VAL;
dbaddr= dbGetPdbAddrFromLink(precord->inp);
dbPut(dbaddr,precord->DOUBLE,(void *)myptr,&e);
//printf("value=",e);
return(2);
}