Experimental Physics and
Industrial Control System

Hi Abdalla,

 

It sounds to me like you may have a buffer overflow problem.  That buffer overflow could be corrupting the link field in the record.

 

The example code you sent does not do anything with the buffer except print it, so it is hard to know what is wrong with the actual driver code.  It is also using a small buffer size of 48.

 

Here are some things I can say:

-          It is definitely possible to have separate threads that read large buffers and do callbacks to asyn device support for waveform records.  The areaDetector module has many such examples.  They are using array sizes of many MB.

-          I don’t think EPICS supports variable length waveform records.  You need to create the waveform record in dbLoadRecords with a size that is the largest you plan to use.  That is what areaDetector does with NDPluginStdArrays.

 

Mark