Re: Changing Asyn Port Driver paramList dynamically

[Lucas Russo via Tech-talk <tech-talk at aps.anl.gov>]

Hi Marcio,

From Asyn version 4-31 onwards you don't need to specify the number of parameters in advance (see https://epics-modules.github.io/master/asyn/R4-31/RELEASE_NOTES.html). You can just use createParam() and the c++ std::vector will handle this for you. So, in your child class I believe you can just call createParam() as usual. You just need to call the father class method if the parameter ID does not belong to your class.

Regarding specifying interfaces/masks I'm not sure if you can modify this after the father class has already initialized. Of course you can always pass these interface/interrupt mask parameters via the constructor, but I think that's not what you want.

You can also take a look at the QuadEM module that does more or less what you want, apparently: https://github.com/epics-modules/quadEM/tree/master/quadEMApp/src

drvQuadEM would be your father class and drvTetrAMM, drvNSLS_EM, etc would be your child classes.

Hope this helps,

Cheers,

Lucas

On Thu, Jul 23, 2020 at 12:16 AM Paduan Donadio, Marcio via Tech-talk <tech-talk at aps.anl.gov> wrote:

Hello.

 

I have this class inheritance scenario:

asynPortDriver <- fatherClass <- childClass

 

fatherClass constructor is calling asynPortDriver constructor, informing the number of elements of paramList as well as masks for interfaces used.

 

I’d like childClass to add more parameters to paramList after fatherClass already created this list and, eventually, add interfaces to the Asyn mask.

 

Is it possible?

 

Thank you,

 

Márcio Paduan Donadio

Control Systems Engineer - SLAC