RE: Stream Device With Parameters

[Gorka Ronda <g.ronda@jema.es>]

Thanks Dirk,

As you requested, I append to this mail part of the device documentation to know what C4 and C5 (Command 4 and 5) do.

Don't hesitate to ask for more information if you need it.

Gorka

 ________________________________________
De: Dirk Zimoch [dirk.zimoch@psi.ch]
Enviado el: jueves, 16 de septiembre de 2010 15:31
Para: Gorka Ronda
CC: tech-talk@aps.anl.gov
Asunto: Re: Stream Device With Parameters

Typos in my previous mail:

Hi Gorka,

I probably did not understand completely what you wanted. You want to be
able to use *different* lo and hi values each time the record processed?

If that is the case you have to store the values in some record. For
example in an "ao" record. (There you can even scale it from "user
units" in VAL to integers in RVAL. See "ao" documentation.)

So let's now assume the two values are in stored in $(P):$(R):C4:LO.RVAL
and $(P):$(R):C4:HI.RVAL. Then you can use redirection to access these
values. You have to give the record names (or the common prefix) to the
protocol as a parameter like this:

field(INP,  "@devwbc6600.proto c4($(P):$(R):C4) $(PORT) $(A)")

and use the name in $1 for two redirections to fetch LO and HI:

out 0xc0 0x04 0xfb "%(\$1:LO.RVAL)r%(\$1:HI.RVAL)r" 0x00 0x00 0x00 0x00
"%<xor>";

The %r converter just outputs the least significant byte of the
mentioned record field.

It would really help to know what the "C4" command actually does. Can
you give me a link to the device documentation?

Dirk

Attachment: Command4&5.doc
Description: Command4&5.doc