Creating a record and using its instance.

["Wang, Andrew via Tech-talk" <tech-talk at aps.anl.gov>]

All,

 

This will be a lengthy post, so please bear with me.

 

I am currently trying to create my own record called “sample”, then create a record instance of “sample” for use in an IOC. The manual helped immensely, but I am still a bit stuck and would appreciate some insight.

 

For creating the record, what I did first was first create a support application by using the command:

 

makeBaseApp.pl -t support sample

 

Then, I modified the configure/RELEASE file so that the correct path for EPICS is specified. Next, I went to sampleApp/src and created two files: sampleRecord.dbd and sampleRecord.c. Here is what I currently have for them.

 

sampleRecord.dbd:

 

recordtype(sample)

{

      include "dbCommon.dbd"

      field(VAL, DBF_DOUBLE)

      {

            asl(ASL0)

            pp(TRUE)

      }

      field(OVAL, DBF_DOUBLE)

      {

      }

}

 

sampleRecord.c:

 

// EPICS IOC header files

#include "callback.h"

#include "dbAccess.h"

#include "dbBase.h"

#include "dbDefs.h"

#include "dbFldTypes.h"

#include "dbScan.h"

#include "dbStaticLib.h"

#include "devLib.h"

#include "devSup.h"

#include "drvSup.h"

#include "epicsExport.h"

#include "initHooks.h"

#include "link.h"

#include "recSup.h"

#include "special.h"

#include "taskwd.h"

 

// Record support header files

#include "sampleRecord.h"

 

// C standard library header files

#include <stdio.h>

static long init_record(void*, int);

static long process(void*);

rset sampleRSET={

    RSETNUMBER,

    NULL,

    NULL,

    init_record,

    process,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL

};

epicsExportAddress(rset, sampleRSET);

 

static long init_record(void* precord, int pass)

{

      //long status;

      //int size_desc;

      sampleRecord *r;

     

      r = (sampleRecord *) precord;

     

      if (!pass)

      {

            //size_desc = sizeof(r->desc) / sizeof(char);

            //snprintf(r->desc, size_desc, "%s", "Hello");

            printf("I've been initialized!\n");

           

            return 0;

      }

     

      return 0;

}

 

static long process(void* precord)

{

      printf("I've been processed!\n");

     

      return 0;

}

 

My goal is to use channel access and see those two messages printed when running iocBoot. For instance, when I run caput sample_record_instance.PROC 1, hopefully it will print “I’ve been processed”.

 

In my following steps, I modified the Makefile in sampleApp/src to be:

 

TOP=../..

 

include $(TOP)/configure/CONFIG

#----------------------------------------

#  ADD MACRO DEFINITIONS AFTER THIS LINE

#=============================

 

#==================================================

# build a support library

 

LIBRARY_IOC += sample

 

# xxxRecord.h will be created from xxxRecord.dbd

DBDINC += sampleRecord.h

 

# install sample.dbd into <top>/dbd

DBD += sampleRecord.dbd

 

# specify all source files to be compiled and added to the library

sample_SRCS += sampleRecord.c

 

sample_LIBS += $(EPICS_BASE_IOC_LIBS)

 

#===========================

 

include $(TOP)/configure/RULES

#----------------------------------------

#  ADD RULES AFTER THIS LINE

 

So after making these modifications and additions, I ran make in TOP and no errors were produced.

 

Finally, I created an IOC application and iocBoot type called “test_sample”. In the configure/RELEASE file, I included:

 

SAMPLE = ${HOME}/myepics/support/sample

 

Then, I created a record instance for “sample” in a database file within test_sampleApp/Db:

 

record(sample, “sample_record_instance”)

{

      field(DESC, “Yay”)

}

 

Finally, I modified the Makefile in test_sampleApp/src to be:

 

TOP=../..

 

include $(TOP)/configure/CONFIG

#----------------------------------------

#  ADD MACRO DEFINITIONS AFTER THIS LINE

#=============================

 

#=============================

# Build the IOC application

 

PROD_IOC = test_sample

 

# test_sample.dbd will be created and installed

DBD += test_sample.dbd

 

# test_sample.dbd will be made up from these files:

test_sample_DBD += base.dbd

 

# Include dbd files from all support applications:

test_sample_DBD += sampleRecord.dbd

 

# Add all the support libraries needed by this IOC

test_sample_LIBS += sample

 

# test_sample_registerRecordDeviceDriver.cpp derives from test_sample.dbd

test_sample_SRCS += test_sample_registerRecordDeviceDriver.cpp

 

# Build the main IOC entry point on workstation OSs.

test_sample_SRCS_DEFAULT += test_sampleMain.cpp

test_sample_SRCS_vxWorks += -nil-

 

# Add support from base/src/vxWorks if needed

#test_sample_OBJS_vxWorks += $(EPICS_BASE_BIN)/vxComLibrary

 

# Finally link to the EPICS Base libraries

test_sample_LIBS += $(EPICS_BASE_IOC_LIBS)

 

#===========================

 

include $(TOP)/configure/RULES

#----------------------------------------

#  ADD RULES AFTER THIS LINE

 

However, when I run make in TOP, I receive the following error:

 

test_sample_registerRecordDeviceDriver.o: In function `_GLOBAL__sub_I_test_sample_registerRecordDeviceDriver':

test_sample_registerRecordDeviceDriver.cpp:(.text.startup+0x2b5): undefined reference to `pvar_func_sampleRecordSizeOffset'

 

Any thoughts?

 

Thank you,

Andy