Experimental Physics and
Industrial Control System

"Zhichu Chen" <[email protected]> · Tue, 17 Jun 2008 12:28:57 +0800

Hi,

I've written a waveform support but I can't make it readable by other records,
so I wrote a soft one like this:
======================================================
static long read_wf(waveformRecord *pwf)
{
    CALLBACK *pcallback=(CALLBACK *)(pwf->dpvt);

    unsigned long i;
    long     BUFFER[10000];
    for (i = 0 ; i < 1500 ; i++) {
        BUFFER[i] = 10 + (i%2) ;
    }
    for (i = 1500 ; i < 4500 ; i++) {
        BUFFER[i] = 510 + (i%2) ;
    }
    for (i = 4500 ; i < 10000 ; i++) {
        BUFFER[i] = 10 + (i%2) ;
    }
    long     *pbuffer;

    if(pwf->pact) {
        pbuffer = BUFFER ;
        pwf->nelm = pwf->nord = 5000;
        pwf->bptr = pbuffer;
    }
    else{
        if(pwf->disv<=0) return(2);
        pwf->pact=TRUE;
        callbackRequestProcessCallbackDelayed(
            pcallback,pwf->prio,pwf,(double)pwf->disv);
        pwf->pact=TRUE;
    }

	return 0;
}
======================================================
and exported it to a device type as "SOFT" and wrote a db file like:
======================================================
record (waveform,   "wf") {
		field(FTVL, "LONG")
		field(SCAN, "1 second")
		field(NELM, "5000")
		field(DTYP, "SOFT")
}

record (subArray,   "sa") {
		field(INP,  "wf.VAL")
		field(SCAN, "1 second")
		field(FTVL, "LONG")
		field(MALM, "100")
		#field(INDX, "0")
		field(NELM, "100")
}
======================================================
the "wf" record gave a correct 5000 points emulated signal array but the "sa"
record just gave me 100 zeros. I've tried some combinations in the DB file like
some of you said it could be better to use "wf.VAL CA" in the INP field of "sa"
or "wf.VAL CP" etc., but I have no luck.

Then I think maybe the waveform support needs modification. So can any of
you give me some advice about how to write the correct waveform support.

By the way, I put another soft waveform record and the subArray could read it.
So basicly, it's not the problem of my EPICS release.

-- 
Best Regards
Chen
----------------------------------------------------------------

 Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
 No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
 tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
 | www.sinap.ac.cn
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System