Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Help developing AD plugin
From:	"Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Cc:	SWC <swc at lnls.br>
Date:	Wed, 16 Aug 2023 20:39:02 +0000

Hi all, we are developing a geometric restoration plugin here at Sirius for areaDetector

Im using NDWarp as a base just because it seems to work as a good example. Also, im unfortunately bound to EPICS 3.15.6, AreaDetector R3-7.

Taking NDWarp as a base, i basically stripped everything between NDPluginWarp::processCallbacks and NDPluginWarp::endProcessCallbacks, so the code is what i append at the end of this e-mail: it should only copy the original array that comes to it and pass it to the other connected plugins.

By compiling and running an IOC with this plugin, when i enable its callbacks i get the following message in my ioc shell:

2023/08/16 17:29:51.666 NDPluginDriver::endProcessCallbacks: Couldn't allocate output array. Further processing terminated.

Although i tried reading the source code, using gdb and recompiling ADCore by adding -g to USR_CXXFLAGS_Linux ad stepping into each function, etc. etc. i couldnt figure out what am i doing wrong. Am i passing a NULL array to NDPluginDriver::endProcessCallbacks?

Are there any hints about this?

Thanks in advance,

Marco

CODE PART:

NDPluginWarp::processCallbacks(NDArray
*pArray){
    // pArray is borrowed reference.  Caller will release()

    NDPluginDriver::beginProcessCallbacks(pArray);

    NDArrayInfo info;
    NDArray *pOutput;
    (void)pArray->getInfo(&info);

    if(pArray->ndims!=2 || info.xSize==0 || info.ySize==0)
{
        asynPrint(pasynUserSelf, ASYN_TRACE_ERROR,
                  "%s::
2D non-empty expected",
                  this->portName);
        return;
    }
    switch(pArray->dataType)
{
    case NDInt8:
    case NDUInt8:
    case NDInt16:
    case NDUInt16:
    case NDInt32:
    case NDUInt32:
    case NDFloat32:
    case NDFloat64:
        break;
    default:
        asynPrint(pasynUserSelf, ASYN_TRACE_ERROR,
                  "%s::
Unsupported type %u",
                  this->portName,
(unsigned)pArray->dataType);
        return;
    }
    asynPrint(pasynUserSelf, ASYN_TRACE_FLOW,
"%s:
%s ndarray=%p\n",
this->portName, __PRETTY_FUNCTION__, pArray);

    printf("a\n");
    this->pNDArrayPool->copy(pArray,
pOutput, true,
true,
true);
    NDPluginDriver::endProcessCallbacks(pOutput,
false,
true);

}

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Replies:: RE: Help developing AD plugin Mark Rivers via Tech-talk

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ANJ, 16 Aug 2023

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System