Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Fri, 07 Dec 2007 14:09:45 +0100

Emmanuel Mayssat wrote:

On Thu, 2007-12-06 at 10:02 +0100, Dirk Zimoch wrote:
readSomething { maxInput=10; out "..."; in "..."; }
writeSomething {
	maxInput=25;
         out "...";
	@init {readSomething;}
}
The @init handler uses the setting maxInput=25.

Obviously there is something wrong with the above.
It is actually the situation I am facing where my protocol has no
terminator and read and write protocols are fundamentally different.
Some of the protocols I have to program are also a bit more complex than
write-once and read-once. They are acknowledgments and some other
features involved.

What exactly do you need to do? Please describe the desired protocol.
In the current implementation, a protocol (including all its handlers) has only
one set of settings. It is not possible to change settings at run time.

That would be a nice addition and would be more intuitive.
As I mentioned earlier I was able to find work-arounds for the issues I
have. BTW, I found streamDevice to work intuitively and as-is for 95% of
my drivers. I love it!
2/ Parameter passing
I am able to refer to another protocol entry in the exception handler
Example:
writeRegister {
  ...
  @init {
     readRegister;
  }
}
You can consider this a two-stage macro substitution. First readRegister in the
@init handler is replaced with all the commands (but NOT the settings) of the
readRegister protocol. Then all parameters in the writeRegister protocol and all
its handlers are replaced with the values passed in the link, including those
parameters which came originally from the readRegister protocol.

In the @init
readRegister($1);
readRegister $1;
did not work for me. Are you saying I should try again? Ok ...

No. Just use @init {readRegister;}
Example:
readRegister { out "\$1"; in "%i";}
writeRegister { ...  @init {readRegister;} }
This is the same as:
writeRegister { ...  @init {out "\$1"; in "%i";} }
The word readRegister is replaced by the commands of the referenced protocol.
field (OUT, "@file writeRegister(XXX) bus")
Now "\$1" is replaced with "XXX", resulting to
writeRegister { ...  @init {out "XXX"; in "%i";} }
Thus, at initialization, the protocol will do: {out "XXX"; in "%i"; }.

Thanks,
--
Emmanuel

--
Dr. Dirk Zimoch
Paul Scherrer Institut, WBGB/006
5232 Villigen PSI, Switzerland
Phone +41 56 310 5182

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System