Experimental Physics and
Industrial Control System

What field is the client writing to?  The VAL field or an individual bit?

 

In R4-21 the following change was made:

“Improved the initMbboDirect function in devAsynUInt32Digital.c. If an initial value is read successfully from the driver it now sets the .Bn fields in the record. It also sets VAL rather than RVAL and returns 2 rather than 0. Thanks to Andrew Johnson for this.”

Mark

 

 

From: Eric Norum [mailto:[email protected]] 
Sent: Monday, September 08, 2014 3:50 PM
To: EPICS mailing list
Subject: mbboDirect problems

 

I have a number of mbboDirect records like:

 

record(mbboDirect, "$(P)$(R)EVR:event12trig") {

    field(DESC, "Extraction pre-trigger")

    field(DTYP, "asynUInt32Digital")

    field(OUT,  "@asynMask($(PORT) 0x30C 0xFF 0)")

    field(NOBT, "8")

    field(MASK, "0xFF")

}

 

The IOC starts up and reads back the initial value of this record properly.

The *first* caput to the record (I’ve tried from EDM and from caput) writes the readback value again, not the value from the client.

Subsequent caputs do write the value from the client.  It’s only the first operation that uses old data.

Is this a known problem? 

 -- 
Eric Norum
[email protected]