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Today, Zen presented a talk on asynportdriver. During the discussion, we talked about aai, aao and waveform and Steph suggested a codeathon task to


combine  them all into waveform and have a flag to define your own bptr. I  mentioned that this can be done in waveform as is, by freeing bptr.

Here is the init routine that does that (in orange)
\\

/\* $Id: devWaveformLlrf.c,v 1.20 2009/06/05 00:43:09 dayle Exp $ \*/

/*=============================================================================
&nbsp;
&nbsp; Name: devWaveformLlrf.c

&nbsp; Abs:&nbsp; Device support for saving raw digitizer data into a waveform
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (4 channels into a single, row-major array).

&nbsp; Auth: 10-nov-2006, Till Straumann (TSS)
&nbsp; Rev:&nbsp; 2008 Dayle Kotturi: adapt read_waveform contents to LLRF app

\-----------------------------------------------------------------------------*/

\#if 0
\#include "copyright_SLAC.h"&nbsp;&nbsp; &nbsp;/\* SLAC copyright comments \*/
\#endif
&nbsp;
/*----------------------------------------------------------------------------\-
&nbsp;
&nbsp; Mod:&nbsp; (see CVS log)

&nbsp;
=============================================================================*/

...

static long
init_record(void \*record_p)
{
waveformRecord&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \*waveform_ps = record_p;
DevWfRawSigDpvt_tps&nbsp;&nbsp; &nbsp;dpvt_ps;

&nbsp;&nbsp; &nbsp;/\* Check DB configuration \*/

&nbsp;&nbsp; &nbsp;if ( waveform_ps->ftvl \!= menuFtypeSHORT ) {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;epicsPrintf
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (DEVSUPNAM": Error \-\- FTVL should be SHORT (is %i)\n",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; waveform_ps->ftvl);
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;goto egress;
&nbsp;&nbsp; &nbsp;}
&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": FTVL is SHORT\n");

&nbsp;&nbsp; &nbsp;/\* Set NELM to what the driver is configured for \*/
{color:#993366}&nbsp;{color}{color:#ff6600}&nbsp; &nbsp;free(waveform_ps->bptr);{color}

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; waveform_ps->nelm = 4*drvPadUdpCommGetNsamples(/*dpvt_ps->station_type*/);
&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": NELM is %d\n", (int) waveform_ps->nelm);

&nbsp;&nbsp; &nbsp;if ( \!(waveform_ps->bptr = calloc(waveform_ps->nelm, sizeof(short))) ) {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;/\* If there's no memory we are unlikely to be able to print something \*/
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;goto egress;
&nbsp;&nbsp; &nbsp;}


&nbsp;&nbsp; &nbsp;if ( VME_IO \!= waveform_ps->inp.type ) {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": Error \-\- INP is not VME_IO (but type %i)\n",
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;waveform_ps->inp.type);
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;goto egress;
&nbsp;&nbsp; &nbsp;}
&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": INP is VME_IO\n");

&nbsp;&nbsp; &nbsp;if ( \!(dpvt_ps = calloc(1, sizeof(*dpvt_ps))) ) {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": Error \-\- no memory\n");
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;goto egress;
&nbsp;&nbsp; &nbsp;}
&nbsp;&nbsp; &nbsp;waveform_ps->dpvt = dpvt_ps;

&nbsp;&nbsp; &nbsp;if ( drvPadUdpCommDpvtInit(&dpvt_ps->drvPadUdpCommPart, waveform_ps->inp.value.vmeio.card) )
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;goto egress;
&nbsp;&nbsp; &nbsp;epicsPrintf(DEVSUPNAM": DPVT initialized\n");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dpvt_ps->station_type = waveform_ps->inp.value.vmeio.card;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #ifdef DEBUG_PRINT
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DEBUGPRINT(DP_INFO, devWaveformLlrfFlag,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ("init_waveform: Record %s setting station to card #%d\n",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; waveform_ps->name, dpvt_ps->station_type));
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #endif

&nbsp;&nbsp; &nbsp;return 0;

egress:
&nbsp;&nbsp; &nbsp;waveform_ps->pact = 1;
&nbsp;&nbsp; &nbsp;return \-1;
}