Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Thu, 17 May 2018 10:53:24 +0000

Hi Jörn,

The parameter library in the asynPrtDriver class does not support array data types.  However, there are virtual methods to read, write, and do callbacks for all of the array data types.  For asynInt32Array these are the methods defined in asynPortDriver.h:

    virtual asynStatus readInt32Array(asynUser *pasynUser, epicsInt32 *value,
                                        size_t nElements, size_t *nIn);
    virtual asynStatus writeInt32Array(asynUser *pasynUser, epicsInt32 *value,
                                        size_t nElements);
    virtual asynStatus doCallbacksInt32Array(epicsInt32 *value,
                                        size_t nElements, int reason, int addr);

The base class implementation readInt32Array and writeInt32Array simply print an error message, so you need to implement those in your driver if you plan to use them.  The base class implementation of doCallbacksInt32Array is normally sufficient, and you should not need to implement it.

This is all documented here:

https://epics.anl.gov/modules/soft/asyn/R4-33/asynDoxygenHTML/classasyn_port_driver.html

Mark

________________________________
From: [email protected] <[email protected]> on behalf of Jörn Dreyer <[email protected]>
Sent: Thursday, May 17, 2018 4:14 AM
To: EPICS tech-talk
Subject: Question regarding asynParamInt32Array

Hi,

looking at the supported data types for parameters in asynPortDriver I found
the asynParamInt32Array to match my needs to transfer 256 integers. But how to
set/get the values. There is no getIntegerArrayParam() function like the
getIntegerParam().

Regards,

Jörn

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System