Experimental Physics and
Industrial Control System

Thanks Mark/Eric

Appreciate the quick response

On 2018/03/15 18:33, Mark Rivers wrote:

If you have maxAddress=N there is nowhere that you tell asynManager the value of N.  It allocates storage for device M when it is first referenced.  So you could have a single address of 10000 and that does not use any more memory than having a single address of 1.

However, asynPortDriver does require you to specify the value of N because it create N parameter table arrays in the constructor.  In the future asynPortDriver could be changed to use an std::map to map address to parameter table and then it could also allocate on-demand.

Mark

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Eric Norum
Sent: Thursday, March 15, 2018 11:27 AM
To: Amien Crombie <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Subject: Re: Asyn - max addresses per port

There is nothing in ASYN that would prohibit this.  I have drivers with dozens of addresses
on a single ASYN port.

On Mar 15, 2018, at 9:19 AM, Amien Crombie <[email protected]> wrote:

Hi

I have a 8-channel Asyn driver that allows me to have 1 port with 8 addresses. Each

address holds a int32.

Now I want to go to 48 addresses...is it possible?

I'm using asyn-4-21

Amien

--
Eric Norum
[email protected]

References:

Asyn - max addresses per port Amien Crombie

Re: Asyn - max addresses per port Eric Norum

RE: Asyn - max addresses per port Mark Rivers

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