Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Mon, 30 Jul 2007 10:19:49 +0900

Hi,

Lei Ge wrote:
> Hello, everyone,
> 
> I made a record support for our special needs. There are 2 arrays in this 
> record support, and I wish to read them from host caget. We are using 
> base3.13.8.
> 
> The definitions for these fields in the dbd file are:  
> 
>        field(BCME,DBF_NOACCESS) { 
>                prompt("BCM readout for BER") 
>                extra("char bcme[402] ") 
>                asl(ASL1) 
>                special(SPC_DBADDR) 
>                interest(3) 
>        } 
>        field(BCMP,DBF_NOACCESS) { 
>                prompt("BCM readout for BER") 
>                extra("char bcmp[402] ") 
>                asl(ASL1) 
>                special(SPC_DBADDR) 
>                interest(3) 
>        } 
> 
> But whenever I caget one of these fields, the cvt_dbaddr is called twice. Is 
> it normally called twice? What's the possible problem in my codes?
I'm not sure if it is "Normal" or not, but cvt_dbaddr is called twice in
my RFFT/CFFT records, which has more than 4 waveforms in it without any
functional problem.
(You can download source code for them from the link at
http://www-acc.kek.jp/EPICS_Gr/products.html )


> 
> static long cvt_dbaddr(paddr) 
>    struct dbAddr *paddr; 
> { 
>    struct bktRecord *pbkt=(struct bktRecord *)paddr->precord; 
>    struct bktdset *pdset = (struct bktdset *)(pbkt->dset); 
> 
>    if (bkt_debug>3) { 
>       printf("cvt_dbaddr\n"); 
>       printf("pbkt bcme, %u, bcmp, %u\n", (long)pbkt->bcme, (long)pbkt- 
>> bcmp); 
>       printf("paddr pfield %u\n", paddr->pfield); 
>      } 
> 
>    if ( ((long)paddr->pfield)==((long)pbkt->bcme) ) { 
>       if (bkt_debug>1) printf("cvt_dbaddr for bcme\n"); 
>       (*pdset->read_rfm)(pbkt); 
>      } else if ( ((long)paddr->pfield)==((long)pbkt->bcmp) ) { 
>       if (bkt_debug>1) printf("cvt_dbaddr for bcmp\n"); 
>       (*pdset->read_rfm)(pbkt); 
>      } else printf("cvt_dbaddr, where is it called?\n"); 
As far as I understand, the functionality of cvt_dbaddr is
to supply information on the requested field.
It may not a good idea to call a fuction to fill a buffer area, I guess.

> 
> /*    paddr->pfield = (void *)(pbkt->bcme); */ 
>    paddr->no_elements = 402; 
>    paddr->field_type = DBF_CHAR; 
>    paddr->field_size = 1; 
>    paddr->dbr_field_type = DBF_CHAR; 
>    return(0); 
> } 
> 
> Thank you all, 
> 
> Ge 

Regards,

Noboru

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System