Slight confusion on how to set var

Comments

• Mike Green Posts: 23,101

  2017-10-04 04:27

  You have to pass the address of the variable in your main program to your object. Your object is going to have some sort of initialization method like:

  pub start(a,b,c)
     ... stuff ...
  

  You need to have another parameter like:

  var long addr    { place to save passed address }
  pub start(a,b,c,d)
      addr := d   { save the address passed in }
  

  Wherever you want to change the variable, you'd use the following. If the variable is a byte or word, you'd use BYTE() or WORD() instead of LONG():

  LONG(addr) := value
  

  In the main program, you'd pass the address of the variable like this:

  start(5, 10, 103, @variable)
  
• DRMorrison Posts: 81

  2017-10-04 04:40 edited 2017-10-04 04:44

  So, object looks like...

  PUB start(@X)
   WORD(X) := y + z
  

  And then the main program would see the new value the next time it went to use it?
  Do I have to call the object from main, or will the value just change from within the object due to
  internal processing within the object?
• DRMorrison Posts: 81

  2017-10-04 05:00 edited 2017-10-04 05:01

  I think I may have this...
  MAIN PROGRAM:

  VAR WORD X
  
  OBJ newX: "Xchanger"
  
  PUB Main
  
   newX.Start(@X)
  

  OBJECT Xchanger:

  VAR WORD Xadd
  
  PUB Start(X)
   Xadd := X
  
  PUB xchange
  
   WORD(Xadd) := {some new value based upon an input etc.}
  

  
  Does this look correct?
  Daniel
• msrobots Posts: 3,704

  2017-10-04 05:16

  yes
  
  Mike
• DRMorrison Posts: 81

  2017-10-04 05:26

  The line:
  WORD(Xadd) won't compile, but this will: WORD[Xadd]
  I'm using BST
  
  Daniel
• Mike Green Posts: 23,101

  2017-10-04 14:36

  Sorry. I got carried away with the parentheses. It indeed is WORD[Xadd]. Looks good.
• DRMorrison Posts: 81

  2017-10-04 16:16

  Thanks to everyone, Daniel