Experimental Physics and
Industrial Control System

Wesley Moore <[email protected]> · Fri, 20 Jul 2012 11:57:19 -0400 (EDT)

> From: "Martin Konrad" <[email protected]>
> what's the recommended way to switch from one sequencer state to
> another
> if a button is clicked on the OPI? What type of record do you use for
> this? What does the "when" statement look like?

I'm following on Ben's recommendation of using bi/bo records.  I've found to be very flexible for later additions of "user commands" and it's easy to read/debug later.  Using bi/bo makes your GUI easy too.  Ben's example showed mbbo.  Here's using a bo for operations.

short scanBtn;   assign scanBtn to "scan";   monitor scanBtn;
short zeroBtn;   assign zeroBtn to "zero";   monitor zeroBtn;

ss ... {
  ...
  state idle {
    when (scanBtn) {
    } state makeScan

    when (abortBtn) {  
        /* bogus abort, just clear the button. */
        abortBtn = 0;
        pvPut(abortBtn);
    } state idle
  }

  state makeScan {
    when (scanBtn) {
      /* do stuff, check for abortBtn. */
      /* then make sure to reset button! */
      scanBtn = 0;
      pvPut(scanBtn);
    } state idle
  }
}

Hope this might help.

Wesley

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System